Problem with PrintWriter
Hi ,
I am using java1.4
I write following code.
Problem is : In the end new file is created , but it is empty nothing is written
in that file . Why ? line1 and line2 should be placed in the file , why it is not happening ?
import java.io.*;
class Test
public static void main(String args[])
try {
File f = new File("test12.txt");
if(!f.exists())
f.createNewFile();
FileWriter fw = new FileWriter(f);
PrintWriter pw = new PrintWriter(fw);
pw.println("line1");
pw.println("line2");
catch (Exception e)
e.printStackTrace();
}
Double posted here
http://forum.java.sun.com/thread.jspa?threadID=783646&tstart=0
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public class Server{
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Socket dianosticsSocket;
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* Server constructor generates a server
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clientName = aClientName;
clientPort = aClientPort;
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// create a new thread
aServerSocket = new ServerSocket(port) ;
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DiagnosticsServer aDiagnosticsServer = new DiagnosticsServer(port,queue,aClientListener);
// System.out.println("Server is running on port " + port + "...");
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catch(Exception e)
// System.out.println("ERROR: Server port " + port + " not available");
JOptionPane.showMessageDialog(null, (e.toString()),"ERROR: Server port " + port + " not available", JOptionPane.ERROR_MESSAGE);
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// connect the client
Socket aClient = aServerSocket.accept();
//System.out.println("open client connection");
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*** connect to another server
public class ClientListener extends Thread{
InetAddress hostName;
int hostPort;
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BufferedReader in;
PrintWriter out;
boolean loggedIn;
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* ClientListener connects to the host server.
* @param aHostName is the name of the host eg server name or IP address.
* @param aHostPort is a port number of the host.
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hostName = aHostName;
hostPort = aHostPort;
queue = aQueue;
serverRef = aServer;
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hostSocket = new Socket(hostName, hostPort);
catch(IOException e){
//System.out.println("ERROR: Connection Host Failed");
JOptionPane.showMessageDialog(null, (e.toString()),"ERROR: Connection to nPort Failed", JOptionPane.ERROR_MESSAGE);
System.exit(0);
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** multi client connection server
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queue = aQueue;
addToQueue(this);
client = aSocket;
clientRef = aClientListener;
aDiagnostic = diagnostics;
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* run method is the main loop of the server program
* in change of handle new client connection as well
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public void run(){
boolean alive = true;
String aSubString = "";
in = null;
out = null;
loginName = "";
loggedIn = false;
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in = new BufferedReader(new InputStreamReader(client.getInputStream()));
out = new PrintWriter(new OutputStreamWriter(client.getOutputStream()));
if(aDiagnostic){
out.println("WELCOME to diagnostics");
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out.println("WELCOME to Troy's Server");
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out.flush();
String line;
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StringTokenizer aStringToken = new StringTokenizer(line, " ");
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broadCastDia(line);
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out.println(line);
out.flush();
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out.flush();
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catch(Exception e){
// System.out.println("ERROR:Client Connection reset");
JOptionPane.showMessageDialog(null, (e.toString()),"ERROR:Client Connection reset", JOptionPane.ERROR_MESSAGE);
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if(aDiagnostic){
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out.flush();
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broadCastDia("Disconnect : client "+client.getInetAddress().toString());
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removeThreadQueue(this);
alive = false;
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// System.out.println("ERROR: Client Connection reset failure");
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* method run - Generates io stream for communicating with the server and
* starts the client gui. Run also parses the input commands from the server.
public void run(){
boolean alive = true;
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// begin to life the gui
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// aGuiClient.show();
in = new BufferedReader(new InputStreamReader(hostSocket.getInputStream()));
out = new PrintWriter(new OutputStreamWriter(hostSocket.getOutputStream()));
while (alive && hostSocket.isConnected()){
String line;
while(((line = in.readLine())!= null)){
System.out.println(line);
broadCast(line);
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catch(Exception e){
// System.out.println("ERRORa Connection to host reset");
JOptionPane.showMessageDialog(null, (e.toString()),"ERROR: Connection to nPort reset", JOptionPane.ERROR_MESSAGE);
try{
hostSocket.close();
}catch(Exception a){
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System.exit(1);
} // end method run -
Hello,
I am having a problem with a program I am trying to write. The idea of the program is to:
A) read a list of movies list from a text file
B) create an object for each movie using the information from the text file
C) place the objects into an arrayList
My problem is that when I check my arrayList it seems to only contain multiple copies of the first movie read from the text file. Here is my code
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.PrintWriter;
import java.io.FileOutputStream;
import java.io.FileNotFoundException;
import java.util.ArrayList;
public class MovieReader
PrintWriter outputStream = null;
public void readFile()
try
BufferedReader in = new BufferedReader(new FileReader("movie.txt"));
String str;
while ((str = in.readLine()) != null)
process(str);
in.close();
catch (IOException e)
e.printStackTrace();
ArrayList <ValidMovie> movieList = new ArrayList<ValidMovie>();
private void process(String line)
String[] array = line.split("\t");
int i = 0;
for ( i = 0; i < array.length; i++)
String tempTitle = array[0];
String tempYear = array [1];
String tempRating = array [2];
String tempFormat = array [3];
ValidMovie uuj = new ValidMovie(tempTitle, tempYear, tempRating, tempFormat);
movieList.add(uuj);
System.out.println("item at index 1 is: " + movieList.get(1));
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
private void writeFile(String [] arrayL)
String [] arrayWrite = arrayL;
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
public static void main(String[] args)
MovieReader mv = new MovieReader();
mv.readFile();
//$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
}This is the code that creates an object for each movie:
import java.io.Serializable;
public class ValidMovie implements Serializable
private String title;
private String year;
private String rating;
private String format;
public ValidMovie()
public ValidMovie(String tTitle, String tYear, String tRating, String tFormat)
title = tTitle;
year = tYear;
rating = tRating;
format = tFormat;
//Getters for title, year, rating and format
public String getTitle ()
return title;
public String getYear ()
return year;
public String getRating ()
return rating;
public String getFormat ()
return format;
public String toString ()
return title + "\t" + year + "\t" + rating + "\t" + format;
}The following is what I have in the movie.txt file:
Bamboozled 2000 2 DVD
What Lies Beneath 2000 1.5 DVD
Beneath the Planet of the Apes 1970 1 DVD
You Can Count On Me 2000 3.5 Theater
And finally this is the result when I run the code:
item at index 1 is: Bamboozled 2000 2 DVD
item at index 1 is: Bamboozled 2000 2 DVD
item at index 1 is: Bamboozled 2000 2 DVD
item at index 1 is: Bamboozled 2000 2 DVD
I am sure that it is something simple that I am overlooking but I cannot figure it out. When I change the index in the code:
System.out.println("item at index 1 is: " + movieList.get(1));to 0 or 2 or 3 then result is the same, it will just show the first movie in the text file. Any help would be greatly appreciated. ThanksThanks for the reply, it helped but I am now getting 4 of each of the movies after adding you suggestion. This is much better now I just need to figure out why the loop is causing the extra copies. Thanks again :)
Item 0: Bamboozled 2000 2 DVD
Item 1: Bamboozled 2000 2 DVD
Item 2: Bamboozled 2000 2 DVD
Item 3: Bamboozled 2000 2 DVD
Item 4: What Lies Beneath 2000 1.5 DVD
Item 5: What Lies Beneath 2000 1.5 DVD
Item 6: What Lies Beneath 2000 1.5 DVD
Item 7: What Lies Beneath 2000 1.5 DVD
Item 8: Beneath the Planet of the Apes 1970 1 DVD
Item 9: Beneath the Planet of the Apes 1970 1 DVD
Item 10: Beneath the Planet of the Apes 1970 1 DVD
Item 11: Beneath the Planet of the Apes 1970 1 DVD
Item 12: You Can Count On Me 2000 3.5 Theater
Item 13: You Can Count On Me 2000 3.5 Theater
Item 14: You Can Count On Me 2000 3.5 Theater
Item 15: You Can Count On Me 2000 3.5 Theater -
Problem with writing and reading using serialization
I am having a problem with writing and reading an object that has another object in it. The purpose of the class is to write a order that has multiple items in it. And there will be several orders. This is for an IB project, where one of the requirements is to utilize a hierarchical composite data structure. That is, it is "one that contains more than one element and at least one of the elements is a composite data structure. Examples are, an array or linked list of records, a record that has one field that is another record, or an array". The code is shown below:
The error produced is
java.lang.NullPointerException
at SamsonRubberIndustries.CustomerOrderDetails.createCustOrdDetailsScreen(CustomerOrderDetails.java:150)
at SamsonRubberIndustries.CustomerOrderDetails$1.run(CustomerOrderDetails.java:78)
at java.awt.event.InvocationEvent.dispatch(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)
public class CustOrdObject implements Serializable {
public int CustID;
public int CustOrderID;
public Object OrderDate;
public InnerCustOrdObject[] innerCustOrdObj;
public float GrandTotal;
public int MaxItems;
public CustOrdObject() {}
public CustOrdObject(InnerCustOrdObject[] innerCustOrdObj,
int CustID, int CustOrderID, Object OrderDate,
float GrandTotal, int innerarrlength, int innerarrpos, int MaxItems) {
this.CustID = CustID;
this.CustOrderID = CustOrderID;
this.OrderDate = OrderDate;
this.GrandTotal = GrandTotal;
this.MaxItems = MaxItems;
this.innerCustOrdObj = new InnerCustOrdObject[MaxItems];
public InnerCustOrdObject[] getInnerCustOrdObj() {
return innerCustOrdObj;
public void setInnerCustOrdObj(InnerCustOrdObject[] innerCustOrdObj) {
this.innerCustOrdObj = innerCustOrdObj;
public int getCustID() {
return CustID;
public void setCustID(int custID) {
CustID = custID;
public int getCustOrderID() {
return CustOrderID;
public void setCustOrderID(int custOrderID) {
CustOrderID = custOrderID;
public Object getOrderDate() {
return OrderDate;
public void setOrderDate(Object orderDate) {
OrderDate = orderDate;
public void setGrandTotal(float grandTotal) {
GrandTotal = grandTotal;
public float getGrandTotal() {
return GrandTotal;
public int getMaxItems() {
return MaxItems;
public void setMaxItems(int maxItems) {
MaxItems = maxItems;
public class InnerCustOrdObject implements Serializable{
public int ItemNumber;
public float UnitPrice;
public int QuantityRequired;
public float TotalPrice;
public InnerCustOrdObject() {}
public InnerCustOrdObject(int ItemNumber, float
UnitPrice, int QuantityRequired, float TotalPrice){
this.ItemNumber = ItemNumber;
this.UnitPrice = UnitPrice;
this.QuantityRequired = QuantityRequired;
this.TotalPrice = TotalPrice;
public int getItemNumber() {
return ItemNumber;
public void setItemNumber(int itemNumber) {
ItemNumber = itemNumber;
public int getQuantityRequired() {
return QuantityRequired;
public void setQuantityRequired(int quantityRequired) {
QuantityRequired = quantityRequired;
public float getTotalPrice() {
return TotalPrice;
public void setTotalPrice(float totalPrice) {
TotalPrice = totalPrice;
public float getUnitPrice() {
return UnitPrice;
public void setUnitPrice(float unitPrice) {
UnitPrice = unitPrice;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.text.SimpleDateFormat;
import java.util.Date;
import javax.swing.*;
import javax.swing.table.DefaultTableCellRenderer;
import javax.swing.table.DefaultTableModel;
public class CustomerOrderDetails extends CommonFeatures{
//TODO
private static int MAX_ORDERS = 200;
private static int MAX_ORDERITEMS = 100;
private static int MaxRecord;
private static int CurrentRecord = 1;
private static int currentItem;
private static int MaxItems;
private static boolean FileExists, recFileExists;
private static CustOrdObject[] orderDetails = new CustOrdObject[MAX_ORDERS];
private static InnerCustOrdObject[] innerCustOrdObj = new InnerCustOrdObject[MAX_ORDERITEMS];
private static File OrderDetailsFile = new File("CustOrdDetails.dat");
private static File OrdRecordNumStore = new File("OrdRecordNumStore.txt");
private static PrintWriter writeFile;
private static BufferedReader readFile;
private static ObjectOutputStream objOut;
private static ObjectInputStream objIn;
//Set format for date
SimpleDateFormat simpleDF = new SimpleDateFormat("dd MM yyyy");
//--<BEGINNING>--Declaring Interface Variables------------------------------------------//
private JPanel innertoppanel, innercenterpanel, innerbottompanel, innerrightpanel, innerleftpanel;
private JLabel CustIDLbl, CustOrderIDLbl, OrderedDateLbl, GrandTotLbl, ItemNumberLbl,UnitPriceLbl, QuantityReqLbl, TotPriceLbl;
private JTextField CustIDTxt, CustOrderIDTxt, OrderedDateTxt, GrandTotTxt, ItemNumberTxt, UnitPriceTxt, QuantityReqTxt, TotPriceTxt;
private JButton addrecordbtn, savebtn, externalprevbtn, externalnextbtn, internalprevbtn, internalnextbtn, gotorecordbtn, additemreqbtn;
//--<END>--Declaring Interface Variables------------------------------------------------//
public static void main(String[] args) {
final CustomerOrderDetails COD = new CustomerOrderDetails();
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
try {
UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
COD.createCustOrdDetailsScreen();
} catch (Exception eb) {
eb.printStackTrace();
//--<BEGINNING>--Creating CustomerOrderDetails Screen---------------------------------------//
public JFrame createCustOrdDetailsScreen() {
createDefaultFrame();
mainframe.setSize(800,500);
createContainerPanel();
containerpanel.add(createCustOrdDetailsTitle(), BorderLayout.NORTH);
containerpanel.add(createCustOrdDetailsMainPanel(), BorderLayout.CENTER);
//containerpanel.add(createCustOrdDetailsLeftNavButtons(), BorderLayout.WEST);
//containerpanel.add(createCustOrdDetailsRightNavButtons(), BorderLayout.EAST);
containerpanel.add(createCustOrdDetailsButtons(), BorderLayout.SOUTH);
mainframe.setContentPane(containerpanel);
mainframe.setLocationRelativeTo(null);
mainframe.setVisible(true);
//--<BEGINNING>--Checks to see whether CRecordNumberStore file exists-------------------------------//
if (OrdRecordNumStore.exists() == true) {
recFileExists = true;
}else {
recFileExists = false;
if (recFileExists == true) {
MaxRecord = readRecordNumber();
CurrentRecord = MaxRecord;
//readOrder();
//readInnerOrderRecord(CurrentRecord);
System.out.println("Current Record " +CurrentRecord);
System.out.println("Max Record " +MaxRecord);
}else{
MaxRecord = 1;
writeRecordNumber(MaxRecord);
CustOrderIDTxt.setText(""+MaxRecord);
System.out.println("Current Record " +CurrentRecord);
System.out.println("Max Record " +MaxRecord);
//--<END>--Checks to see whether CRecordNumberStore file exists--------------------------------------//
if(readOrder() != null){
orderDetails = (CustOrdObject[]) readOrder();
innerCustOrdObj = orderDetails[CurrentRecord].getInnerCustOrdObj();
MaxItems = orderDetails[CurrentRecord].getMaxItems();
if(CurrentRecord > 1 && CurrentRecord < MaxRecord){
externalnextbtn.setEnabled(true);
externalprevbtn.setEnabled(true);
if(CurrentRecord >= MaxRecord){
externalnextbtn.setEnabled(false);
getFieldText(CurrentRecord-1);
}else{
orderDetails[CurrentRecord] = new CustOrdObject();
currentItem = 1;
return mainframe;
//--<END>--Creating CustomerOrderDetails Screen---------------------------------------------//
public JPanel createCustOrdDetailsTitle(){
createTitlePanel();
titlepanel.setBackground(TxtfontColor);
label.setText("- Customer Order Details -");
labelpanel.setBackground(TxtfontColor);
label.setForeground(Color.white);
createbuttonpanel();
buttonpanel.setBackground(TxtfontColor) ;
buttonpanel.add(createReturnToMainMenuButton());
titlepanel.add(labelpanel, BorderLayout.WEST);
titlepanel.add(buttonpanel, BorderLayout.EAST);
return titlepanel;
public JPanel createCustOrdDetailsMainPanel(){
createmainpanel();
mainpanel.setBackground(TxtfontColor);
mainpanel.setLayout(new BorderLayout());
mainpanel.setBorder(BorderFactory.createTitledBorder(""));
mainpanel.add(createInnerTopPanel(), BorderLayout.NORTH);
mainpanel.add(createInnerCenterPanel(), BorderLayout.CENTER);
mainpanel.add(createInnerBottomPanel(), BorderLayout.SOUTH);
mainpanel.add(createInnerRightPanel(), BorderLayout.EAST);
mainpanel.add(createInnerLeftPanel(), BorderLayout.WEST);
return mainpanel;
public JPanel createInnerTopPanel(){
innertoppanel = new JPanel(new GridBagLayout());
innertoppanel.setBackground(TxtfontColor);
GridBagConstraints GBC = new GridBagConstraints();
GBC.fill = GridBagConstraints.HORIZONTAL;
//Setting Font Type and Size
Font font = new Font("Arial", Font.BOLD, 11);
CustIDLbl = new JLabel("Customer ID");
CustIDLbl.setBorder(BorderFactory.createEmptyBorder(10,10,10,10));
CustIDLbl.setFont(font);
CustIDLbl.setForeground(LblfontColor);
GBC.gridx = 1;
GBC.gridy = 1;
innertoppanel.add(CustIDLbl, GBC);
CustIDTxt = new JTextField(20);
CustIDTxt.setEditable(true);
GBC.gridx = 2;
GBC.gridy = 1;
innertoppanel.add(CustIDTxt, GBC);
GBC.gridx = 3;
GBC.gridy = 1;
innertoppanel.add(Box.createHorizontalStrut(220), GBC);
OrderedDateLbl = new JLabel("Order Date");
OrderedDateLbl.setBorder(BorderFactory.createEmptyBorder(10,10,10,10));
OrderedDateLbl.setFont(font);
OrderedDateLbl.setForeground(LblfontColor);
GBC.gridx = 4;
GBC.gridy = 1;
innertoppanel.add(OrderedDateLbl, GBC);
//Get today's date
Date todaydate = new Date();
OrderedDateTxt = new JTextField(simpleDF.format(todaydate), 20);
OrderedDateTxt.setHorizontalAlignment(JTextField.CENTER);
OrderedDateTxt.setEditable(false);
GBC.gridx = 5;
GBC.gridy = 1;
innertoppanel.add(OrderedDateTxt, GBC);
CustOrderIDLbl = new JLabel("Customer Order ID");
CustOrderIDLbl.setBorder(BorderFactory.createEmptyBorder(10,10,10,10));
CustOrderIDLbl.setFont(font);
CustOrderIDLbl.setForeground(LblfontColor);
GBC.gridx = 1;
GBC.gridy = 2;
innertoppanel.add(CustOrderIDLbl, GBC);
CustOrderIDTxt = new JTextField(20);
CustOrderIDTxt.setEditable(false);
GBC.gridx = 2;
GBC.gridy = 2;
innertoppanel.add(CustOrderIDTxt, GBC);
return innertoppanel;
public JPanel createInnerCenterPanel(){
innercenterpanel = new JPanel(new GridBagLayout());
innercenterpanel.setBackground(TxtfontColor);
innercenterpanel.setBorder(BorderFactory.createLoweredBevelBorder());
GridBagConstraints GBC = new GridBagConstraints();
GBC.fill = GridBagConstraints.HORIZONTAL;
//Setting Font Type and Size
Font font = new Font("Arial", Font.BOLD, 11);
ItemNumberLbl = new JLabel("Item Number");
ItemNumberLbl.setBorder(BorderFactory.createEmptyBorder(10,10,10,10));
ItemNumberLbl.setFont(font);
ItemNumberLbl.setForeground(LblfontColor);
GBC.gridx = 1;
GBC.gridy = 1;
innercenterpanel.add(ItemNumberLbl, GBC);
ItemNumberTxt = new JTextField(20);
GBC.gridx = 2;
GBC.gridy = 1;
innercenterpanel.add(ItemNumberTxt, GBC);
UnitPriceLbl = new JLabel("Unit Price");
UnitPriceLbl.setBorder(BorderFactory.createEmptyBorder(10,10,10,10));
UnitPriceLbl.setFont(font);
UnitPriceLbl.setForeground(LblfontColor);
GBC.gridx = 1;
GBC.gridy = 2;
innercenterpanel.add(UnitPriceLbl, GBC);
UnitPriceTxt = new JTextField(20);
//UnitPriceTxt.setEditable(false);
GBC.gridx = 2;
GBC.gridy = 2;
innercenterpanel.add(UnitPriceTxt, GBC);
QuantityReqLbl = new JLabel("Quantity Required");
QuantityReqLbl.setBorder(BorderFactory.createEmptyBorder(10,10,10,10));
QuantityReqLbl.setFont(font);
QuantityReqLbl.setForeground(LblfontColor);
GBC.gridx = 1;
GBC.gridy = 3;
innercenterpanel.add(QuantityReqLbl, GBC);
QuantityReqTxt = new JTextField(20);
//QuantityReqTxt.setEditable(false);
GBC.gridx = 2;
GBC.gridy = 3;
innercenterpanel.add(QuantityReqTxt, GBC);
TotPriceLbl = new JLabel("Total Price");
TotPriceLbl.setBorder(BorderFactory.createEmptyBorder(10,10,10,10));
TotPriceLbl.setFont(font);
TotPriceLbl.setForeground(LblfontColor);
GBC.gridx = 1;
GBC.gridy = 4;
innercenterpanel.add(TotPriceLbl, GBC);
TotPriceTxt = new JTextField(20);
//TotPriceTxt.setEditable(false);
GBC.gridx = 2;
GBC.gridy = 4;
innercenterpanel.add(TotPriceTxt, GBC);
return innercenterpanel;
public JPanel createInnerBottomPanel(){
innerbottompanel = new JPanel(new FlowLayout(FlowLayout.RIGHT));
innerbottompanel.setBackground(TxtfontColor);
//Setting Font Type and Size
Font font = new Font("Arial", Font.BOLD, 11);
GrandTotLbl = new JLabel("Grand Total");
GrandTotLbl.setBorder(BorderFactory.createEmptyBorder(10,10,10,10));
GrandTotLbl.setFont(font);
GrandTotLbl.setForeground(LblfontColor);
innerbottompanel.add(GrandTotLbl);
innerbottompanel.add(Box.createHorizontalStrut(30));
GrandTotTxt = new JTextField(20);
innerbottompanel.add(GrandTotTxt);
return innerbottompanel;
public JPanel createInnerRightPanel(){
innerrightpanel = new JPanel(new FlowLayout(FlowLayout.CENTER));
innerrightpanel.setBackground(TxtfontColor);
innerrightpanel.setLayout(new BoxLayout(navrightpanel, BoxLayout.Y_AXIS));
innerrightpanel.setBorder(BorderFactory.createLoweredBevelBorder());
innerrightpanel.setLayout(new GridBagLayout());
GridBagConstraints GBC = new GridBagConstraints();
GBC.fill = GridBagConstraints.HORIZONTAL;
internalnextbtn = new JButton(createNextButtonIcon());
GBC.gridx = 1;
GBC.gridy = 1;
internalnextbtn.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent evt){
//getInnerFieldText(currentItem);
internalprevbtn.setEnabled(true);
if(currentItem < MaxItems){
++CurrentRecord;
//readOrder();
//readInnerOrderRecord(CurrentRecord);
setInnerFieldText(currentItem);
System.out.println(CurrentRecord);//Checking RECORD_NUM
if(currentItem == MaxItems){
internalnextbtn.setEnabled(false);
innerrightpanel.add(internalnextbtn, GBC);
return innerrightpanel;
public JPanel createInnerLeftPanel(){
innerleftpanel = new JPanel(new FlowLayout(FlowLayout.CENTER));
innerleftpanel.setBackground(TxtfontColor);
innerleftpanel.setBorder(BorderFactory.createLoweredBevelBorder());
innerleftpanel.setForeground(Color.BLACK);
innerleftpanel.setLayout(new GridBagLayout());
GridBagConstraints GBC = new GridBagConstraints();
GBC.fill = GridBagConstraints.HORIZONTAL;
internalprevbtn = new JButton(createPreviousButtonIcon());
GBC.gridx = 1;
GBC.gridy = 1;
internalprevbtn.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent evt){
//getInnerFieldText(currentItem);
internalnextbtn.setEnabled(true);
if(currentItem == 1){
internalprevbtn.setEnabled(false);
if(currentItem > 0){
--currentItem;
//readOrder();
setInnerFieldText(currentItem);
innerleftpanel.add(internalprevbtn, GBC);
return innerleftpanel;
public JPanel createCustOrdDetailsButtons(){
createbuttonpanel();
buttonpanel.setBackground(TxtfontColor);
externalprevbtn = new JButton(createPreviousButtonIcon());
externalprevbtn.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent evt){
getFieldText(CurrentRecord);
externalnextbtn.setEnabled(true);
if(CurrentRecord == 1){
externalprevbtn.setEnabled(false);
if(CurrentRecord > 0){
--CurrentRecord;
setFieldText(CurrentRecord);
System.out.println(CurrentRecord);//Checking RECORD_NUM
buttonpanel.add(externalprevbtn);
addrecordbtn = new JButton("Add Record", createAddButtonIcon());
addrecordbtn.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent evt){
try{
MaxRecord = readRecordNumber();
MaxRecord++;
writeRecordNumber(MaxRecord);
//--<BEGINNING>--Clear Fields-------------------------------------------------------//
CustIDTxt.setText("");
CustOrderIDTxt.setText(""+MaxRecord);
//Get today's date
Date todaydate = new Date();
OrderedDateTxt.setText(""+simpleDF.format(todaydate));
ItemNumberTxt.setText("");
UnitPriceTxt.setText("");
QuantityReqTxt.setText("");
TotPriceTxt.setText("");
GrandTotTxt.setText("");
//--<END>--Clear Fields-------------------------------------------------------------//
externalnextbtn.setEnabled(false);
externalprevbtn.setEnabled(true);
System.out.println(MaxRecord);
} catch(Exception ec){ec.printStackTrace();}
buttonpanel.add(addrecordbtn);
savebtn = new JButton("Save Data", createSaveButtonIcon());
savebtn.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent evt){
setFieldText(CurrentRecord);
writeOrder();
writeRecordNumber(MaxRecord);
System.out.println(CurrentRecord);
System.out.println(MaxRecord);
buttonpanel.add(savebtn);
java.net.URL imageURL_AddRowIcon = CommonFeatures.class.getResource("Icons/edit_add.png");
ImageIcon AddRowIcon = new ImageIcon(imageURL_AddRowIcon);
additemreqbtn = new JButton("Add Item", AddRowIcon);
additemreqbtn.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent evt){
try{
//--<BEGINNING>--Clear Fields-------------------------------------------------------//
ItemNumberTxt.setText("");
UnitPriceTxt.setText("");
QuantityReqTxt.setText("");
TotPriceTxt.setText("");
//--<END>--Clear Fields-------------------------------------------------------------//
//CurrentRecord = MaxRecord;
currentItem++;
setInnerFieldText(currentItem);
internalnextbtn.setEnabled(false);
internalprevbtn.setEnabled(true);
System.out.println(MaxRecord);
} catch(Exception ec){ec.printStackTrace();}
buttonpanel.add(additemreqbtn);
externalnextbtn = new JButton(createNextButtonIcon());
externalnextbtn.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent evt){
getFieldText(CurrentRecord);
externalprevbtn.setEnabled(true);
if(CurrentRecord < MaxRecord){
++CurrentRecord;
setFieldText(CurrentRecord);
System.out.println(CurrentRecord);//Checking RECORD_NUM
if(CurrentRecord == MaxRecord){
externalnextbtn.setEnabled(false);
buttonpanel.add(externalnextbtn);
return buttonpanel;
//TODO
public void setFieldText(int orderID){//TODO
orderDetails[orderID].setCustID(Integer.parseInt(CustIDTxt.getText()));
orderDetails[orderID].setCustOrderID(Integer.parseInt(CustOrderIDTxt.getText()));
orderDetails[orderID].setOrderDate(OrderedDateTxt.getText());
orderDetails[orderID].setInnerCustOrdObj(innerCustOrdObj);
orderDetails[orderID].setMaxItems(MaxItems);
setInnerFieldText(currentItem);
orderDetails[orderID].setGrandTotal(Float.parseFloat(GrandTotTxt.getText()));
public void setInnerFieldText(int currentItem){//TODO
innerCustOrdObj[currentItem] = new InnerCustOrdObject();
innerCustOrdObj[currentItem].setItemNumber(Integer.parseInt(ItemNumberTxt.getText()));
innerCustOrdObj[currentItem].setUnitPrice(Float.parseFloat(UnitPriceTxt.getText()));
innerCustOrdObj[currentItem].setQuantityRequired(Integer.parseInt(QuantityReqTxt.getText()));
innerCustOrdObj[currentItem].setTotalPrice(Float.parseFloat(TotPriceTxt.getText()));
public void getFieldText(int orderID){
CustIDTxt.setText(Integer.toString(orderDetails[orderID].getCustID()));
CustOrderIDTxt.setText(Integer.toString(orderDetails[orderID].getCustOrderID()));
OrderedDateTxt.setText(""+orderDetails[orderID].getOrderDate());
currentItem = orderDetails[orderID].getMaxItems();
System.err.println("currentItem" + currentItem);
getInnerFieldText(currentItem);
GrandTotTxt.setText(Float.toString(orderDetails[orderID].getGrandTotal()));
public void getInnerFieldText(int currentItem){
ItemNumberTxt.setText(Integer.toString(innerCustOrdObj[currentItem].getItemNumber()));
UnitPriceTxt.setText(Float.toString(innerCustOrdObj[currentItem].getUnitPrice()));
QuantityReqTxt.setText(Integer.toString(innerCustOrdObj[currentItem].getQuantityRequired()));
TotPriceTxt.setText(Float.toString(innerCustOrdObj[currentItem].getTotalPrice()));
public void writeOrder(){//TODO
try {
objOut = new ObjectOutputStream(new FileOutputStream(OrderDetailsFile));
objOut.writeObject(orderDetails);
System.out.println("WORKING!");
objOut.flush();
objOut.close();
} catch (IOException e) {
e.printStackTrace();
public Object readOrder(){
Object temporaryObj;
try{
objIn = new ObjectInputStream(new FileInputStream(OrderDetailsFile));
temporaryObj = objIn.readObject();
CustOrdObject[] blah = (CustOrdObject[]) temporaryObj;
System.out.println("Outer: "+blah[1].getCustID());
InnerCustOrdObject[] whee = blah[1].getInnerCustOrdObj();
System.out.println("Inner: "+whee[1].getItemNumber());
objIn.close();
System.out.println("Read Worky!");
return temporaryObj;
}catch(Exception e){
e.printStackTrace();
System.out.println("Read No Worky!");
return null;
public void writeRecordNumber(int MaxRecord){
try{
objOut = new ObjectOutputStream(new FileOutputStream(OrdRecordNumStore));
objOut.writeObject(MaxRecord);
System.out.println("WORKING!");
objOut.flush();
objOut.close();
}catch(Exception e){e.printStackTrace();}
public int readRecordNumber() {
try {
objIn = new ObjectInputStream(new FileInputStream(OrdRecordNumStore));
int temporaryObj = Integer.parseInt(objIn.readObject().toString());
objIn.close();
System.out.println("Read Number Worky!");
return temporaryObj;
} catch (Exception e) {
e.printStackTrace();
System.out.println("Read Number No Worky!");
return -1;
}Message was edited by:
Kilik07
Message was edited by:
Kilik07ok i got reading to work to a certain extent... but the prob is i cnt seem to save my innerCustOrdObj proprly...when ever i look for a record using the gotorecordbtn, the outerobject, which is the orderDetails, seems to change but the innerCustOrdObj remains the same... heres the new code..
public class CustomerOrderDetails extends CommonFeatures{
//TODO
private static int MAX_ORDERS = 200;
private static int MAX_ORDERITEMS = 100;
private static int MaxRecord;
private static int CurrentRecord = 1;
private static int currentItem;
private static int MaxItems = 1;
private static boolean FileExists, recFileExists;
private static boolean RecordExists;
private static CustOrdObject[] orderDetails = new CustOrdObject[MAX_ORDERS];
private static InnerCustOrdObject[] innerCustOrdObj = new InnerCustOrdObject[MAX_ORDERITEMS];
private static File OrderDetailsFile = new File("CustOrdDetails.ser");
private static File OrdRecordNumStore = new File("OrdRecordNumStore.txt");
private static PrintWriter writeFile;
private static BufferedReader readFile;
private static ObjectOutputStream objOut;
private static ObjectInputStream objIn;
//Set format for date
SimpleDateFormat simpleDF = new SimpleDateFormat("dd MM yyyy");
//--<BEGINNING>--Declaring Interface Variables------------------------------------------//
private JPanel innertoppanel, innercenterpanel, innerbottompanel, innerrightpanel, innerleftpanel;
private JLabel CustIDLbl, CustOrderIDLbl, OrderedDateLbl, GrandTotLbl, ItemNumberLbl,UnitPriceLbl, QuantityReqLbl, TotPriceLbl;
private JTextField CustIDTxt, CustOrderIDTxt, OrderedDateTxt, GrandTotTxt, ItemNumberTxt, UnitPriceTxt, QuantityReqTxt, TotPriceTxt;
private JButton addrecordbtn, savebtn, externalprevbtn, externalnextbtn, internalprevbtn, internalnextbtn, gotorecordbtn, additemreqbtn;
//--<END>--Declaring Interface Variables------------------------------------------------//
public static void main(String[] args) {
final CustomerOrderDetails COD = new CustomerOrderDetails();
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
try {
UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
COD.createCustOrdDetailsScreen();
} catch (Exception eb) {
eb.printStackTrace();
//--<BEGINNING>--Creating CustomerOrderDetails Screen---------------------------------------//
public JFrame createCustOrdDetailsScreen() {
createDefaultFrame();
mainframe.setSize(800,500);
createContainerPanel();
containerpanel.add(createCustOrdDetailsTitle(), BorderLayout.NORTH);
containerpanel.add(createCustOrdDetailsMainPanel(), BorderLayout.CENTER);
//containerpanel.add(createCustOrdDetailsLeftNavButtons(), BorderLayout.WEST);
//containerpanel.add(createCustOrdDetailsRightNavButtons(), BorderLayout.EAST);
containerpanel.add(createCustOrdDetailsButtons(), BorderLayout.SOUTH);
mainframe.setContentPane(containerpanel);
mainframe.setLocationRelativeTo(null);
mainframe.setVisible(true);
//--<BEGINNING>--Checks to see whether CRecordNumberStore file exists-------------------------------//
if (OrdRecordNumStore.exists() == true) {
recFileExists = true;
}else {
recFileExists = false;
if (recFileExists == true) {
MaxRecord = readRecordNumber();
CurrentRecord = MaxRecord;
//readOrder();
//readInnerOrderRecord(CurrentRecord);
System.out.println("Current Record " +CurrentRecord);
System.out.println("Max Record " +MaxRecord);
}else{
MaxRecord = 1;
writeRecordNumber(MaxRecord);
CustOrderIDTxt.setText(""+MaxRecord);
System.out.println("Current Record " +CurrentRecord);
System.out.println("Max Record " +MaxRecord);
//--<END>--Checks to see whether CRecordNumberStore file exists--------------------------------------//
if(readOrder() != null){
orderDetails = (CustOrdObject[]) readOrder();
//CurrentRecord--;
//System.out.println("Current Rec Here"+CurrentRecord);
if(orderDetails[CurrentRecord] == null){
System.err.println("CustomerOrderObj 1 is null !!");
}else{
System.err.println("CustomerOrderObj 1 is not null !!");
if(orderDetails[CurrentRecord].getInnerCustOrdObj() == null){
System.err.println("InnerCustomerOrderObj is null !!");
}else{
System.err.println("InnerCustomerOrderObj is not null !!");
innerCustOrdObj = orderDetails[CurrentRecord].getInnerCustOrdObj();
MaxItems = orderDetails[CurrentRecord].getMaxItems();
if(CurrentRecord > 1 && CurrentRecord < MaxRecord){
externalnextbtn.setEnabled(true);
externalprevbtn.setEnabled(true);
if(CurrentRecord >= MaxRecord){
externalnextbtn.setEnabled(false);
getFieldText(CurrentRecord);
getInnerFieldText(MaxItems);
}else{
orderDetails[CurrentRecord] = new CustOrdObject();
currentItem = 1;
return mainframe;
//--<END>--Creating CustomerOrderDetails Screen---------------------------------------------//
public JPanel createCustOrdDetailsTitle(){
createTitlePanel();
titlepanel.setBackground(TxtfontColor);
label.setText("- Customer Order Details -");
labelpanel.setBackground(TxtfontColor);
label.setForeground(Color.white);
createbuttonpanel();
buttonpanel.setBackground(TxtfontColor) ;
buttonpanel.add(createReturnToMainMenuButton());
titlepanel.add(labelpanel, BorderLayout.WEST);
titlepanel.add(buttonpanel, BorderLayout.EAST);
return titlepanel;
public JPanel createCustOrdDetailsMainPanel(){
createmainpanel();
mainpanel.setBackground(TxtfontColor);
mainpanel.setLayout(new BorderLayout());
mainpanel.setBorder(BorderFactory.createTitledBorder(""));
mainpanel.add(createInnerTopPanel(), BorderLayout.NORTH);
mainpanel.add(createInnerCenterPanel(), BorderLayout.CENTER);
mainpanel.add(createInnerBottomPanel(), BorderLayout.SOUTH);
mainpanel.add(createInnerRightPanel(), BorderLayout.EAST);
mainpanel.add(createInnerLeftPanel(), BorderLayout.WEST);
return mainpanel;
public JPanel createInnerTopPanel(){
innertoppanel = new JPanel(new GridBagLayout());
innertoppanel.setBackground(TxtfontColor);
GridBagConstraints GBC = new GridBagConstraints();
GBC.fill = GridBagConstraints.HORIZONTAL;
//Setting Font Type and Size
Font font = new Font("Arial", Font.BOLD, 11);
CustIDLbl = new JLabel("Customer ID");
CustIDLbl.setBorder(BorderFactory.createEmptyBorder(10,10,10,10));
CustIDLbl.setFont(font);
CustIDLbl.setForeground(LblfontColor);
GBC.gridx = 1;
GBC.gridy = 1;
innertoppanel.add(CustIDLbl, GBC);
CustIDTxt = new JTextField(20);
CustIDTxt.setEditable(true);
GBC.gridx = 2;
GBC.gridy = 1;
innertoppanel.add(CustIDTxt, GBC);
GBC.gridx = 3;
GBC.gridy = 1;
innertoppanel.add(Box.createHorizontalStrut(220), GBC);
OrderedDateLbl = new JLabel("Order Date");
OrderedDateLbl.setBorder(BorderFactory.createEmptyBorder(10,10,10,10));
OrderedDateLbl.setFont(font);
OrderedDateLbl.setForeground(LblfontColor);
GBC.gridx = 4;
GBC.gridy = 1;
innertoppanel.add(OrderedDateLbl, GBC);
//Get today's date
Date todaydate = new Date();
OrderedDateTxt = new JTextField(simpleDF.format(todaydate), 20);
OrderedDateTxt.setHorizontalAlignment(JTextField.CENTER);
OrderedDateTxt.setEditable(false);
GBC.gridx = 5;
GBC.gridy = 1;
innertoppanel.add(OrderedDateTxt, GBC);
CustOrderIDLbl = new JLabel("Customer Order ID");
CustOrderIDLbl.setBorder(BorderFactory.createEmptyBorder(10,10,10,10));
CustOrderIDLbl.setFont(font);
CustOrderIDLbl.setForeground(LblfontColor);
GBC.gridx = 1;
GBC.gridy = 2;
innertoppanel.add(CustOrderIDLbl, GBC);
CustOrderIDTxt = new JTextField(20);
//CustOrderIDTxt.setEditable(false);
GBC.gridx = 2;
GBC.gridy = 2;
innertoppanel.add(CustOrderIDTxt, GBC);
return innertoppanel;
public JPanel createInnerCenterPanel(){
innercenterpanel = new JPanel(new GridBagLayout());
innercenterpanel.setBackground(TxtfontColor);
innercenterpanel.setBorder(BorderFactory.createLoweredBevelBorder());
GridBagConstraints GBC = new GridBagConstraints();
GBC.fill = GridBagConstraints.HORIZONTAL;
//Setting Font Type and Size
Font font = new Font("Arial", Font.BOLD, 11);
ItemNumberLbl = new JLabel("Item Number");
ItemNumberLbl.setBorder(BorderFactory.createEmptyBorder(10,10,10,10));
ItemNumberLbl.setFont(font);
ItemNumberLbl.setForeground(LblfontColor);
GBC.gridx = 1;
GBC.gridy = 1;
innercenterpanel.add(ItemNumberLbl, GBC);
ItemNumberTxt = new JTextField(20);
GBC.gridx = 2;
GBC.gridy = 1;
innercenterpanel.add(ItemNumberTxt, GBC);
UnitPriceLbl = new JLabel("Unit Price");
UnitPriceLbl.setBorder(BorderFactory.createEmptyBorder(10,10,10,10));
UnitPriceLbl.setFont(font);
UnitPriceLbl.setForeground(LblfontColor);
GBC.gridx = 1;
GBC.gridy = 2;
innercenterpanel.add(UnitPriceLbl, GBC);
UnitPriceTxt = new JTextField(20);
//UnitPriceTxt.setEditable(false);
GBC.gridx = 2;
GBC.gridy = 2;
innercenterpanel.add(UnitPriceTxt, GBC);
QuantityReqLbl = new JLabel("Quantity Required");
QuantityReqLbl.setBorder(BorderFactory.createEmptyBorder(10,10,10,10));
QuantityReqLbl.setFont(font);
QuantityReqLbl.setForeground(LblfontColor);
GBC.gridx = 1;
GBC.gridy = 3;
innercenterpanel.add(QuantityReqLbl, GBC);
QuantityReqTxt = new JTextField(20);
//QuantityReqTxt.setEditable(false);
GBC.gridx = 2;
GBC.gridy = 3;
innercenterpanel.add(QuantityReqTxt, GBC);
TotPriceLbl = new JLabel("Total Price");
TotPriceLbl.setBorder(BorderFactory.createEmptyBorder(10,10,10,10));
TotPriceLbl.setFont(font);
TotPriceLbl.setForeground(LblfontColor);
GBC.gridx = 1;
GBC.gridy = 4;
innercenterpanel.add(TotPriceLbl, GBC);
TotPriceTxt = new JTextField(20);
TotPriceTxt.setEditable(false);
TotPriceTxt.addFocusListener(new FocusAdapter(){
public void focusGained(FocusEvent evt){
TotPriceTxt.setText(""+Integer.parseInt(UnitPriceTxt.getText())*Integer.parseInt(QuantityReqTxt.getText()));
GBC.gridx = 2;
GBC.gridy = 4;
innercenterpanel.add(TotPriceTxt, GBC);
return innercenterpanel;
public JPanel createInnerBottomPanel(){
innerbottompanel = new JPanel(new FlowLayout(FlowLayout.RIGHT));
innerbottompanel.setBackground(TxtfontColor);
//Setting Font Type and Size
Font font = new Font("Arial", Font.BOLD, 11);
GrandTotLbl = new JLabel("Grand Total");
GrandTotLbl.setBorder(BorderFactory.createEmptyBorder(10,10,10,10));
GrandTotLbl.setFont(font);
GrandTotLbl.setForeground(LblfontColor);
innerbottompanel.add(GrandTotLbl);
innerbottompanel.add(Box.createHorizontalStrut(30));
GrandTotTxt = new JTextField(20);
innerbottompanel.add(GrandTotTxt);
return innerbottompanel;
public JPanel createInnerRightPanel(){
innerrightpanel = new JPanel(new FlowLayout(FlowLayout.CENTER));
innerrightpanel.setBackground(TxtfontColor);
innerrightpanel.setLayout(new BoxLayout(navrightpanel, BoxLayout.Y_AXIS));
innerrightpanel.setBorder(BorderFactory.createLoweredBevelBorder());
innerrightpanel.setLayout(new GridBagLayout());
GridBagConstraints GBC = new GridBagConstraints();
GBC.fill = GridBagConstraints.HORIZONTAL;
internalnextbtn = new JButton(createNextButtonIcon());
GBC.gridx = 1;
GBC.gridy = 1;
internalnextbtn.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent evt){
getInnerFieldText(currentItem);
internalprevbtn.setEnabled(true);
if(currentItem < MaxItems){
++currentItem;
orderDetails[CurrentRecord].getInnerCustOrdObj();
setInnerFieldText(currentItem);
System.out.println("Current Item" + currentItem);
if(currentItem == MaxItems){
internalnextbtn.setEnabled(false);
innerrightpanel.add(internalnextbtn, GBC);
return innerrightpanel;
public JPanel createInnerLeftPanel(){
innerleftpanel = new JPanel(new FlowLayout(FlowLayout.CENTER));
innerleftpanel.setBackground(TxtfontColor);
innerleftpanel.setBorder(BorderFactory.createLoweredBevelBorder());
innerleftpanel.setForeground(Color.BLACK);
innerleftpanel.setLayout(new GridBagLayout());
GridBagConstraints GBC = new GridBagConstraints();
GBC.fill = GridBagConstraints.HORIZONTAL;
internalprevbtn = new JButton(createPreviousButtonIcon());
GBC.gridx = 1;
GBC.gridy = 1;
internalprevbtn.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent evt){
getInnerFieldText(currentItem);
internalnextbtn.setEnabled(true);
if(currentItem == 1){
internalprevbtn.setEnabled(false);
if(currentItem > 0){
--currentItem;
orderDetails[CurrentRecord].getInnerCustOrdObj();
setInnerFieldText(currentItem);
System.out.println("Current Item" + currentItem);
innerleftpanel.add(internalprevbtn, GBC);
return innerleftpanel;
public JPanel createCustOrdDetailsButtons(){
createbuttonpanel();
buttonpanel.setBackground(TxtfontColor);
externalprevbtn = new JButton(createPreviousButtonIcon());
externalprevbtn.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent evt){
getFieldText(CurrentRecord);
externalnextbtn.setEnabled(true);
if(CurrentRecord == 1){
externalprevbtn.setEnabled(false);
if(CurrentRecord > 0){
--CurrentRecord;
setFieldText(CurrentRecord);
System.out.println("Current Record " + CurrentRecord);//Checking RECORD_NUM
buttonpanel.add(externalprevbtn);
addrecordbtn = new JButton("Add Record", createAddButtonIcon());
addrecordbtn.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent evt){
try{
MaxRecord = readRecordNumber();
MaxRecord++;
CurrentRecord = MaxRecord;
orderDetails[CurrentRecord] = new CustOrdObject();
writeRecordNumber(MaxRecord);
MaxItems = 1;
innerCustOrdObj[MaxItems] = new InnerCustOrdObject();
//--<BEGINNING>--Clear Fields-------------------------------------------------------//
CustIDTxt.setText("");
CustOrderIDTxt.setText(""+MaxRecord);
//Get today's date
Date todaydate = new Date();
OrderedDateTxt.setText(""+simpleDF.format(todaydate));
ItemNumberTxt.setText("");
UnitPriceTxt.setText("");
QuantityReqTxt.setText("");
TotPriceTxt.setText("");
GrandTotTxt.setText("");
//--<END>--Clear Fields-------------------------------------------------------------//
externalnextbtn.setEnabled(false);
externalprevbtn.setEnabled(true);
System.out.println(MaxRecord);
} catch(Exception ec){ec.printStackTrace();}
buttonpanel.add(addrecordbtn);
savebtn = new JButton("Save Data", createSaveButtonIcon());
savebtn.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent evt){
setFieldText(CurrentRecord);
setInnerFieldText(MaxItems);
writeOrder();
writeRecordNumber(MaxRecord);
System.out.println(CurrentRecord);
System.out.println(MaxRecord);
buttonpanel.add(savebtn);
java.net.URL imageURL_AddRowIcon = CommonFeatures.class.getResource("Icons/edit_add.png");
ImageIcon AddRowIcon = new ImageIcon(imageURL_AddRowIcon);
additemreqbtn = new JButton("Add Item", AddRowIcon);
additemreqbtn.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent evt){
try{
//--<BEGINNING>--Clear Fields-------------------------------------------------------//
ItemNumberTxt.setText("");
UnitPriceTxt.setText("");
QuantityReqTxt.setText("");
TotPriceTxt.setText("");
//--<END>--Clear Fields-------------------------------------------------------------//
//CurrentRecord = MaxRecord;
MaxItems++;
innerCustOrdObj[MaxItems] = new InnerCustOrdObject();
System.out.println("Max Items "+MaxItems);
currentItem = MaxItems;
orderDetails[CurrentRecord].setMaxItems(MaxItems);
///setInnerFieldText(currentItem);
internalnextbtn.setEnabled(false);
internalprevbtn.setEnabled(true);
} catch(Exception ec){ec.printStackTrace();}
buttonpanel.add(additemreqbtn);
externalnextbtn = new JButton(createNextButtonIcon());
externalnextbtn.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent evt){
getFieldText(CurrentRecord);
externalprevbtn.setEnabled(true);
if(CurrentRecord < MaxRecord){
++CurrentRecord;
setFieldText(CurrentRecord);
System.out.println(CurrentRecord);//Checking RECORD_NUM
if(CurrentRecord == MaxRecord){
externalnextbtn.setEnabled(false);
buttonpanel.add(externalnextbtn);
gotorecordbtn = new JButton("Go To Record", createGotoButtonIcon());
gotorecordbtn.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt){
* The text from the GotorecordTxt textfield will be taken and assigned
* to a temporary integer variable called Find.
int Find = Integer.parseInt(CustOrderIDTxt.getText());
for(int j=1; j <= MaxRecord; j++){
* Using a for loop, each record can be read using the readCustRecord
* method.
getFieldText(j);
* An if condition is utilized to check whether the temporary stored variable, Find,
* matches a field in a record. If this record is found, then using the RecordExists
* which was declared at the top, either a true or false statement can be assigned
* If the record exists, then a true statement will be assigned, if not a false
* statement will be assigned.
if(orderDetails[j].getCustOrderID() == Find){
RecordExists = true;
break;
}else{
RecordExists = false;
if(RecordExists == false){
* If the RecordExists is assigned a false statement, then a message will be
* displayed to show that the record does not exist.
JOptionPane.showMessageDialog(null, "Record Does Not Exist!", "Error Message", JOptionPane.ERROR_MESSAGE, createErrorIcon());
}else{
getFieldText(Find);
buttonpanel.add(gotorecordbtn);
return buttonpanel;
//TODO
public void setFieldText(int orderID){//TODO
orderDetails[orderID].setCustID(Integer.parseInt(CustIDTxt.getText()));
orderDetails[orderID].setCustOrderID(Integer.parseInt(CustOrderIDTxt.getText()));
orderDetails[orderID].setOrderDate(OrderedDateTxt.getText());
orderDetails[orderID].setInnerCustOrdObj(innerCustOrdObj);
orderDetails[orderID].setMaxItems(MaxItems);
setInnerFieldText(currentItem);
orderDetails[orderID].setGrandTotal(Float.parseFloat(GrandTotTxt.getText()));
public void setInnerFieldText(int currentItem){//TODO
innerCustOrdObj[currentItem] = new InnerCustOrdObject();
innerCustOrdObj[currentItem].setMaxItems(MaxItems);
innerCustOrdObj[currentItem].setItemNumber(Integer.parseInt(ItemNumberTxt.getText()));
innerCustOrdObj[currentItem].setUnitPrice(Float.parseFloat(UnitPriceTxt.getText()));
innerCustOrdObj[currentItem].setQuantityRequired(Integer.parseInt(QuantityReqTxt.getText()));
innerCustOrdObj[currentItem].setTotalPrice(Float.parseFloat(TotPriceTxt.getText()));
public void getFieldText(int orderID){
CustIDTxt.setText(Integer.toString(orderDetails[orderID].getCustID()));
CustOrderIDTxt.setText(Integer.toString(orderDetails[orderID].getCustOrderID()));
OrderedDateTxt.setText(""+orderDetails[orderID].getOrderDate());
currentItem = orderDetails[orderID].getMaxItems();
orderDetails[orderID].getInnerCustOrdObj();
System.err.println("currentItem" + currentItem);
//getInnerFieldText(currentItem);
GrandTotTxt.setText(Float.toString(orderDetails[orderID].getGrandTotal()));
public void getInnerFieldText(int currentItem){
ItemNumberTxt.setText(Integer.toString(innerCustOrdObj[currentItem].getItemNumber()));
UnitPriceTxt.setText(Float.toString(innerCustOrdObj[currentItem].getUnitPrice()));
QuantityReqTxt.setText(Integer.toString(innerCustOrdObj[currentItem].getQuantityRequired()));
TotPriceTxt.setText(Float.toString(innerCustOrdObj[currentItem].getTotalPrice()));
public void writeOrder(){//TODO
try {
objOut = new ObjectOutputStream(new FileOutputStream(OrderDetailsFile));
objOut.writeObject(orderDetails);
System.out.println("WORKING!");
objOut.flush();
objOut.close();
} catch (IOException e) {
e.printStackTrace();
public Object readOrder(){
Object temporaryObj;
try{
objIn = new ObjectInputStream(new FileInputStream(OrderDetailsFile));
temporaryObj = objIn.readObject();
CustOrdObject[] blah = (CustOrdObject[]) temporaryObj;
/* System.out.println("Outer: "+blah[1].getCustID());
InnerCustOrdObject[] whee = blah[1].getInnerCustOrdObj();
System.out.println("Inner: "+whee[1].getItemNumber());*/
objIn.close();
System.out.println("Read Worky!");
return temporaryObj;
}catch(Exception e){
e.printStackTrace();
System.out.println("Read No Worky!");
return null;
public void writeRecordNumber(int MaxRecord){
try{
objOut = new ObjectOutputStream(new FileOutputStream(OrdRecordNumStore));
objOut.writeObject(MaxRecord);
System.out.println("WORKING!");
objOut.flush();
objOut.close();
}catch(Exception e){e.printStackTrace();}
public int readRecordNumber() {
try {
objIn = new ObjectInputStream(new FileInputStream(OrdRecordNumStore));
int temporaryObj = Integer.parseInt(objIn.readObject().toString());
objIn.close();
System.out.println("Read Number Worky!");
return temporaryObj;
} catch (Exception e) {
e.printStackTrace();
System.out.println("Read Number No Worky!");
return -1;
}Message was edited by:
Kilik07 -
Problem with java.sql.Clob and oracle.sql.CLOB
Hi,
I am using oracle9i and SAP web application server. I am getClob method and storing that in java.sql.Clob and using the getClass().getName() I am getting the class name as oracle.sql.CLOB. But when I am trying to cast this to oracle.sql.CLOB i am getting ClassCastException. The code is given below
java.sql.Clob lOracleClob = lResultSet.getClob(lColIndex + 1);
lPrintWriter = new PrintWriter(new BufferedWriter (((oracle.sql.CLOB) lOracleClob).getCharacterOutputStream()));
lResourceStatus = true;
can anybody please tell me the what is the problem with this and solution.
thanks,
Ashok.Hi Ashok
You can get a "ClassCastException" when the JVM doesn't have access to the specific class (in your case, "oracle.sql.CLOB").
Just check your classpath and see if you are referring to the correct jar files.
cheers
Sameer
PS: Please award points if you find the answer useful -
Problems with the Proxy Programme--Please help
Hi All,
I have written a simple proxy server in the form of a servlet. I changed the proxy config of my browser to connect to this servlet hosted on the default context(http://localhost:8080) of the Tomcat 5.0.25 . Well , this servlet internally connects to the proxy of the corporate LAN . The logic that I have applied is as follows. The servlet gets the request from the client (ie the browser in this case) , extracts the headers and contents from the request, sets them to a new request that it forms and finally send this new request to the proxy. When the proxy responds, the servlet collects the response headers and contents adn writes them in its response. To sum up , this servlet transparently carries the requests and responses between the client(browser) and the corporate LAN proxy. Now the problem is this. Let's say , now I am accessing http://www.google.com.The browser sends a request to my servlet with the following headers as they are extracted by my servlet.
ProxyServer:::>posting request
ProxyServer:::>headerValue::> headerName = accept : headerValue=*/*
ProxyServer:::>headerValue::> headerName = referer : headerValue=http://www.google.com/
ProxyServer:::>headerValue::> headerName = accept-language : headerValue=en-us
ProxyServer:::>headerValue::> headerName = proxy-connection : headerValue=Keep-Alive
ProxyServer:::>headerValue::> headerName = user-agent : headerValue=Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0; UB1.4_IE6.0_SP1; .NET CLR 1.0.3705; .NET CLR 1.1.4322)
ProxyServer:::>headerValue::> headerName = host : headerValue=www.google.com
ProxyServer:::>headerValue::> headerName = cookie : headerValue=PREF=ID=1be27c0a74f198ca:TM=1082058853:LM=1082058853:S=bu6ORrygzm8AUkm8
ProxyServer:::>postRequest
I set these headers into a new connection opened to the proxy and post a fresh request to the proxy,which, in turn responds with the following headers.
ProxyServer:::>posted request successfully
ProxyServer:::>writing response
ProxyServer:::>writeResponse-->headerName = Proxy-Connection : headerValue = [close]
ProxyServer:::>writeResponse-->headerName = Content-Length : headerValue = [257]
ProxyServer:::>writeResponse-->headerName = Date : headerValue = [Tue, 13 Jul 2004 14:01:40 GMT]
ProxyServer:::>writeResponse-->headerName = Content-Type : headerValue = [text/html]
ProxyServer:::>writeResponse-->headerName = Server : headerValue = [NetCache appliance (NetApp/5.5R2)]
ProxyServer:::>writeResponse-->headerName = Proxy-Authenticate : headerValue = [Basic realm="Charlotte - napxyclt2"]
ProxyServer:::>writeResponse-->headerName = null : headerValue = [HTTP/1.1 407 Proxy Authentication Required]
ProxyServer:::>writeResponse exiting
ProxyServer:::>wrote response successfully
I write these headers back to the client. According to what I was thinking, the client ie the browser would open a new dialog box asking for username/password owing to the presence of the "Proxy-Authenticate " header. But it does not happen that way. Rather the browser stops responsding and displays a blank page. Does anyone know why it happens this way? I am pasting the server prog below for everybody's reference.
package server.proxy;
//import all servlet related classes
import javax.servlet.*;
import javax.servlet.http.*;
import java.util.*;
import java.io.*;
import java.net.*;
import server.resources.*;
//My Proxy server --->Currently it is very simplea and relies on
//other proxy servers of an already connected network.
public class ProxyServer extends HttpServlet
//stores the resource bundle
private ServerResBundle resBundle = null;
//checks for the mode of operation
private boolean proxySet = false;
private String proxy = null;
//storing the original System out/err etc
private PrintStream sysOutOrig = null;
private PrintStream sysErrOrig = null;
private InputStream sysInOrig = null;
//initialise certain features that are required later
public void init() throws ServletException
try
//initialise the resource bundle
this.initResBundle();
System.out.println("ProxyServer:::>res bundle init");
//set the mode of operation
this.setMode();
System.out.println("ProxyServer:::>mode set");
//set the system out and err --System.setOut etc
this.setSystemOutErr();
System.out.println("ProxyServer:::>in/out/err set");
}//End try
catch(Exception e)
System.out.println("Exception in init..."+(e.getMessage()));
throw new ServletException(e);
}//Edn
catch(Throwable e)
System.out.println("Irrecoverable Error...");
throw new ServletException(e);
}//End
}//End init
//method to init the resource bundle;
private void initResBundle()
this.resBundle = ServerResBundle.getBundle();
}//End
//method to set the mode of the server--proxy or direct
private void setMode()
//read the target proxy property from the bundle and
//if it is set,take that URL
String temp = (String)(this.resBundle.getResource(ResKeys.PROXY_SERVER));
if ( (temp != null) && (temp.length() > 0) )
this.proxySet = true;
this.proxy = temp;
temp = null;
}//End
}//End
//method to set the system out and err etc
private void setSystemOutErr() throws Exception
//keep a copy of the original system out and error
this.sysOutOrig = System.out;
this.sysErrOrig = System.err;
try
//read the options adn if they are set, take the values directly
String newOutStr = (String)(this.resBundle.getResource(ResKeys.SYSTEM_OUT));
String newErrStr = (String)(this.resBundle.getResource(ResKeys.SYSTEM_ERR));
if ((newOutStr != null) && (newOutStr.length() > 0))
System.setOut(new PrintStream(new FileOutputStream(new File(newOutStr),true),true));
}//End if
if ((newErrStr != null) && (newErrStr.length() > 0))
System.setErr(new PrintStream(new FileOutputStream(new File(newErrStr),true),true));
}//End if
}//End
catch(Exception e)
//restore the stuff
System.setOut(this.sysOutOrig);
System.setErr(this.sysErrOrig);
}//End
}//End
//this is where the proxy functionalities will be embedded
public void service(HttpServletRequest req,HttpServletResponse resp)
throws ServletException,java.io.IOException
//conenction URL
URL target = null;
//conenction to the remote object
URLConnection targetConn = null;
//stores the OOS and the OIS
ObjectOutputStream oos = null;
ObjectInputStream ois = null;
try
//check for the mode of operation
if (proxySet)
URLConnection objects go through two phases: first they are created, then they are connected.
After being created, and before being connected, various options can be specified
(e.g., doInput and UseCaches). After connecting, it is an error to try to set them.
Operations that depend on being connected, like getContentLength, will implicitly perform the connection,
if necessary.
//for the URL to the proxy
target=new URL(this.proxy);
//conenct to the proxy
targetConn = target.openConnection();
//set the details of the connectuon
targetConn.setDoInput(true);
targetConn.setDoOutput(true);
targetConn.setUseCaches(false);
// If true, this URL is being examined in a context in which it makes sense to allow user interactions such as popping up an authentication dialog. If false, then no user interaction is allowed
targetConn.setAllowUserInteraction(true);
//connect to the remote object
// targetConn.connect();//call this only when all the request properties are set
System.out.println("ProxyServer:::>posting request");
//post the received request to the URL
this.postRequest(targetConn,req);
System.out.println("ProxyServer:::>posted request successfully");
System.out.println("ProxyServer:::>writing response");
//receive the response
//write the received response to the client
this.writeResponse(targetConn,resp);
System.out.println("ProxyServer:::>wrote response successfully");
}//End if
else
//currently this functionality is not supported
throw new ServletException(
(String)(this.resBundle.getResource(ResKeys.ERR_FUNC_NOTSUPPORTED)));
}//End
}//End try
catch(Exception e)
if(e instanceof ServletException)
throw (ServletException)e;
}//End
if (e instanceof IOException)
throw (IOException)e;
}//End
//wrap it up in ServletException
throw new ServletException(e);
}//End
}//End
//method to write the response back to the client
private void writeResponse(URLConnection targetConn,HttpServletResponse resp)
throws ServletException
//get all the header fields from the response connection and set them to the
//response of the servlet
Map headerFields = null;
Iterator headerFieldEntries = null;
Map.Entry header = null;
//stores the input stream to the conn
BufferedReader brConn = null;
//stores the writer to the response
PrintWriter prResp = null;
//checks if the proxy authentication needed or not
boolean proxyAuthReqd = false;
try
//juste ensuring that the proxy authentication is reset
proxyAuthReqd = false;
if( (targetConn != null) && (resp != null) )
//Returns an unmodifiable Map of the header fields.
//The Map keys are Strings that represent the response-header field names.
//Each Map value is an unmodifiable List of Strings that represents the corresponding
//field values
headerFields = targetConn.getHeaderFields();
//Returns a set view of the mappings contained in this map
Set temp = headerFields.entrySet();
//Returns an iterator over the elements in this set
headerFieldEntries = temp.iterator();
if (headerFieldEntries != null)
while (headerFieldEntries.hasNext())
Object tempHeader = headerFieldEntries.next();
if (tempHeader instanceof Map.Entry)
header = (Map.Entry)tempHeader;
Object headerName = header.getKey();
Object headerValue=header.getValue();
System.out.println("ProxyServer:::>writeResponse-->headerName = "+headerName+" : headerValue = "+headerValue);
//do not select the key-value pair if both the key adn the value are null
if ( ( headerName == null) && (headerValue == null) )
continue;
}//Enmd
if (headerValue != null)
List headerValList = null;
if (headerValue instanceof List)
headerValList = (List)headerValue;
}//End
if(headerValList != null)
for (int i=0;i<headerValList.size();i++)
Object headerValueStr = headerValList.get(i);
if (headerValueStr instanceof String)
//note that the header-key can not be null for addHeader
//I have made this temporary provision to make the programme work.
resp.addHeader(( (headerName==null)? ("null_header"+i) :(String)headerName),
(String)headerValueStr);
//check if the proxy authentication required or not
if (((String)headerValueStr).
indexOf(resp.SC_PROXY_AUTHENTICATION_REQUIRED+"") != -1)
System.out.println("ProxyServer:::>writeResponse-->proxy auth needed");
//proxy authentication is needed
proxyAuthReqd = true;
}//End
}//Ednd of
else if (headerValueStr == null)
resp.addHeader(( (headerName==null)? null :(String)headerName),
null);
}//End
}//End for
}//End if
}//End if
}//End
}//End while
}//End if
//get the writer to the client
prResp = resp.getWriter();
System.out.println("ProxyServer:::>writeResponse-->proxyAuthReqd="+proxyAuthReqd);
//juste test a simple header
System.out.println("Proxy-Authenticate = "+(resp.containsHeader("Proxy-Authenticate")));
//if the proxy asks you for authentication,pass on the same to the client
//from whom you have received the request.When this flag is true,the connection
//is closed by the remotehost adn hence any attempt to open in input steram
//results in an error ie IOException
if (!proxyAuthReqd)
//now get the content adn write it to the response too
brConn = new BufferedReader(new InputStreamReader(
targetConn.getInputStream()));
String tempStr = null;
while ((tempStr = brConn.readLine())!=null)
prResp.println(tempStr);
}//End while
//close the connections
brConn.close();
}//End if
else
prResp.println("Proxy Authentication needed...");
}//End
//close the streams
prResp.flush();
prResp.close();
}//End if
System.out.println("ProxyServer:::>writeResponse exiting\n");
}//End try
catch(Exception e)
throw new ServletException(e);
}//End
}//End
//method to post request to the internet
private void postRequest(URLConnection targetConn,HttpServletRequest req)
throws ServletException
//extract the header parameters and the body content from the incoming request
//and set them to the new connection
Enumeration reqHeaders = null;
//reads the incoming request's content
BufferedReader brReqRd = null;
PrintWriter prResWt = null;
//stores temp header names and values
String headerName = null;
String headerValue = null;
try
if( (targetConn != null) && (req != null) )
reqHeaders = req.getHeaderNames();
//extract a header adn set it to the new connection
while (reqHeaders.hasMoreElements())
headerName = (String)(reqHeaders.nextElement());
headerValue = req.getHeader(headerName);
targetConn.setRequestProperty(headerName,headerValue);
System.out.println("ProxyServer:::>headerValue::> headerName = "+headerName+" : headerValue="+headerValue);
}//End
System.out.println("ProxyServer:::>postRequest\n");
//establis the actual connection
//calling this method bfore the above loop results in IllegalStateException
targetConn.connect();
//NOTE : try reading from and writing into OIS and OOS respectively
//now read the contents and write them to the connection
// brReqRd = req.getReader(); //this hangs for some reason
brReqRd = new BufferedReader(new InputStreamReader(req.getInputStream()));
System.out.println("Got the reader..brReqRd = "+brReqRd);
if (brReqRd != null)
String temp = null;
//establish the printwriter
// prResWt = new PrintWriter(targetConn.getOutputStream(),true);
prResWt = new PrintWriter(targetConn.getOutputStream());
System.out.println("trying to read in a loop from brReqRd.. ready="+(brReqRd.ready()));
while( (brReqRd.ready()) && ((temp=brReqRd.readLine()) != null) )
System.out.println("In while::>temp = "+temp);
prResWt.println(temp);
}//Emd while
//close the streams adn go back
brReqRd.close();
prResWt.flush();
prResWt.close();
}//End
}//End outer if
System.out.println("ProxyServer:::>postRequest exiting\n");
}//End try
catch(Exception e)
throw new ServletException(e);
}//End
}//End
}//EndHi serlank ,
Thanks for your reply. Well , I initially I thought of not pasting the code,as it was too long. But I could not help it,as I thought I must show in code what I exactly meant. That's why I followed a description of my problem with the code. You could probably have copied the code and pasted it in one of your favourite editors to take a look at it. Did you,by any chance, try to read it on the browser? And as regards reposting the same message, I can say that I did it as I felt the subject was not quite appropriate in the first posting and I was not sure as to how I could delete/alter the posting. I am not asking for a code-fix,but some suggestions from some one who might ever have come across such a thing.Anyway, lemme know if you have any idea on it. Thanks... -
Out.println() problems with large amount of data in jsp page
I have this kind of code in my jsp page:
out.clearBuffer();
out.println(myText); // size of myText is about 300 kbThe problem is that I manage to print the whole text only sometimes. Very often happens such that the receiving page gets only the first 40 kb and then the printing stops.
I have made such tests that I split the myText to smaller parts and out.print() them one by one:
Vector texts = splitTextToSmallerParts(myText);
for(int i = 0; i < texts.size(); i++) {
out.print(text.get(i));
out.flush();
}This produces the same kind of result. Sometimes all parts are printed but mostly only the first parts.
I have tried to increase the buffer size but neither that makes the printing reliable. Also I have tried with autoFlush="false" so that I flush before the buffer size gets overflowed; again same result, sometimes works sometimes don't.
Originally I use such a system where Visual Basic in Excel calls a jsp page. However, I don't think that this matters since the same problems occur if I use a browser.
If anyone knows something about problems with large jsp pages, I would appreciate that.Well, there are many ways you could do this, but it depends on what you are looking for.
For instance, generating an Excel Spreadsheet could be quite easy:
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
public class TableTest extends HttpServlet{
public void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException {
response.setContentType("application/xls");
PrintWriter out = new PrintWriter(response.getOutputStream());
out.println("Col1\tCol2\tCol3\tCol4");
out.println("1\t2\t3\t4");
out.println("3\t1\t5\t7");
out.println("2\t9\t3\t3");
out.flush();
out.close();
}Just try this simple code, it works just fine... I used the same approach to generate a report of 30000 rows and 40 cols (more or less 5MB), so it should do the job for you.
Regards -
Hello all,
I am making a simple HttpServlet, which takes input
from html page and saves in to a file, but I'm having a
bit of a problem with file permissions.
I'm getting the following exception
java.security.AccessControlException: access denied (java.io.FilePermission ./data/result read)
java.security.AccessControlContext.checkPermission(AccessControlContext.java:264)
java.security.AccessController.checkPermission(AccessController.java:427)
java.lang.SecurityManager.checkPermission(SecurityManager.java:532)
java.lang.SecurityManager.checkRead(SecurityManager.java:871)
java.io.File.exists(File.java:700)
SyksyHTTPServlet.doPost(SyksyHTTPServlet.java:31)
javax.servlet.http.HttpServlet.service(HttpServlet.java:709)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
sun.reflect.GeneratedMethodAccessor52.invoke(Unknown Source)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
java.lang.reflect.Method.invoke(Method.java:585)
org.apache.catalina.security.SecurityUtil$1.run(SecurityUtil.java:243)
java.security.AccessController.doPrivileged(Native Method)
javax.security.auth.Subject.doAsPrivileged(Subject.java:517)
org.apache.catalina.security.SecurityUtil.execute(SecurityUtil.java:275)
org.apache.catalina.security.SecurityUtil.doAsPrivilege(SecurityUtil.java:161)The exception seems to occur when I'm trying to check whether the file already
exists or not.
The data directory has all permissions (read, write and execute) set for all users,
and I have made an empty file called result inside the data directory for testing.
This file has read and write permissions enabled for all users.
Here's my code
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import java.util.Enumeration;
import java.util.List;
import java.util.ArrayList;
public class SyksyHTTPServlet extends HttpServlet
public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
int totalCount = 0;
List list;
String song = request.getParameter("song");
PrintWriter out = response.getWriter();
File file = new File("./data/result");
if(file.exists()) // this is line 31, which seems to cause the exception
list = readFile(file);
else
file.createNewFile();
list = new ArrayList();
list.add(song);
writeFile(file, list);
for(int i = 0 ; i < list.size() ; i++)
out.println(list.get(i));
public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
doPost(request, response);
private List readFile(File file)
List list = null;
try
FileInputStream fis = new FileInputStream(file);
ObjectInputStream ois = new ObjectInputStream(fis);
list = (ArrayList)ois.readObject();
ois.close();
catch(Exception e)
e.printStackTrace();
return list;
private void writeFile(File file, List list)
try
FileOutputStream fos = new FileOutputStream(file);
ObjectOutputStream oos = new ObjectOutputStream(fos);
oos.writeObject(list);
oos.flush();
oos.close();
catch(Exception e)
e.printStackTrace();
}I'm using Tomcat 5.5 on Ubuntu Linux, if that has anything to do with this.
I'll appreciate all help.
kari-mattiHello again.
I'm still having problems with this. I made
a simple servlet that reads from and writes
to text file. The reading part work fine on my
computer, but the writing doesn't, not even
an exception is thrown if the file exists that
I'm trying to write to. If I try to create a new
file I'll get an exception about file permissions.
I also asked a friend of mine to try this same
servlet on his windows computer and it works
as it should.
Here's the code
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
public class ReadServlet extends HttpServlet
public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
String s = "";
PrintWriter out = response.getWriter();
String docroot = getServletContext().getRealPath( "/" );
out.println("docroot: "+docroot);
File file = new File(docroot+"test.txt");
if(file.exists())
s = readFile(file);
out.println(s);
else
out.println("file not found");
//file.createNewFile(); // causes exception
//out.println("new file created.");
writeFile(file, "written by servlet");
out.println("Now look in the file "+file.getPath());
out.println("and see if it contains text 'written by servlet'");
public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
doPost(request, response);
private String readFile(File file)
FileInputStream fis = null;
BufferedInputStream bis = null;
DataInputStream dis = null;
String s = "";
try
fis = new FileInputStream(file);
bis = new BufferedInputStream(fis);
dis = new DataInputStream(bis);
s = dis.readLine();
fis.close();
bis.close();
dis.close();
catch(Exception e)
e.printStackTrace();
return s;
private void writeFile(File file, String s)
FileOutputStream fos = null;
BufferedOutputStream bos = null;
DataOutputStream dos = null;
try
fos = new FileOutputStream(file);
bos = new BufferedOutputStream(fos);
dos = new DataOutputStream(bos);
dos.writeChars(s);
fos.flush();
bos.flush();
dos.flush();
fos.close();
bos.close();
dos.close();
catch(Exception e)
e.printStackTrace();
}And if someone wants to test this servlet I can
give a war package.
Any advices?
kari-matti -
Problem with running multiple servlet in same webapplication with tomcat 3
Hi all,
I am using Tomcat 3.0 as webserver with jdk1.3, Servlet 2.0,
Templates for html file and oracle 8i on UNIX platform.
I have problem with multiple servlet running same webapplication.
There are two servlet used in my application. 1) GenServlet.class
and 2) ServletForPrinting.class
All of my pages go through GenServlet.class which reads some property files
and add header and footer in all pages.
I want reports without header & footer that is not possible through GenServlet in my application.
So I have used another servlet called ServletForPrinting --- just for reading html file.
It is as follow:
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class ServletForPrinting extends HttpServlet {
public void service (HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException
// set content-type header before accessing the Writer
response.setContentType("text/html");
PrintWriter out = response.getWriter();
File f1 = null;
String report = null;
String path = request.getPathInfo();
try{
String p = "/var/home/latif/proj/webapps/WEB-INF/classes" + path;
System.out.println(p);
f1 = new File(p);
p = null;
if (f1.exists()) {
FileReader fr = new FileReader(f1);
BufferedReader br = new BufferedReader(fr);
report = new String();
while ((report = br.readLine()) != null) {
out.println(report);
}catch(Exception e) {
out.close();
report = null;
path = null;
f1 = null;
} // end class
It works fine and display report properly.
But now Problem is that if report is refreshed many times subsequently,
WebServer will not take any new change in any of java file used in web-application.
It works with the previous class only and not with updated one.
Then I need to touch it. As soon as I touch it, webserver will take updated class file.
Anybody has any idea regarding these situation?
Is there any bug in my ServletForPrinting.java ?
Any solution ????? Please suggest me.
Suggestion from all are invited. That will help me a lot.
Thanks in advance
Deepalee.Llisas wrote:
I solved the problem, I just had to wire the blocks in a sequential way (I still don't know why, but it works).
Feel free to delete this topic.
I would strongly suggest at least reading this tutorial to give you an idea of why your fix worked (or maybe only appeared to work). Myself, I never just throw up my hands and say, "Whatever," and wash my hands of the situation without trying my best to understand just what fixed it. Guranteed you'll run into the same/similar problem and this time your fix won't work.
Please do yourself a favor and try to understand why it is working now, and save yourself (or more likely, the next poor dev to work on this project) some heartache.
Bill
(Mid-Level minion.)
My support system ensures that I don't look totally incompetent.
Proud to say that I've progressed beyond knowing just enough to be dangerous. I now know enough to know that I have no clue about anything at all. -
A simple problem with sateful Session beans
Hi,
I have a really novice problem with stateful session bean in Java EE 5.
I have written a simple session bean which has a counter inside it and every time a client call this bean it must increment the count value and return it back.
I have also created a simple servlet to call this session bean.
Everything seemed fine I opened a firefox window and tried to load the page, the counter incremented from 1 to 3 for the 3 times that I reloaded the page then I opened an IE window (which I think is actually a new client) but the page counter started from 4 not 1 for the new client and it means that the new client has access to the old client session bean.
Am I missing anything here???
Isn�t it the way that a stateful session bean must react?
This is my stateful session bean source.
package test;
import javax.ejb.Stateful;
@Stateful
public class SecondSessionBean implements SecondSessionRemote
private int cnt;
/** Creates a new instance of SecondSessionBean */
public SecondSessionBean ()
cnt=1;
public int getCnt()
return cnt++;
And this is my simple client site servlet
package rezaServlets;
import java.io.*;
import java.net.*;
import javax.ejb.EJB;
import javax.servlet.*;
import javax.servlet.http.*;
import test.SecondSessionRemote;
public class main extends HttpServlet
@EJB
private SecondSessionRemote secondSessionBean;
protected void processRequest (HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException
response.setContentType ("text/html;charset=UTF-8");
PrintWriter out = response.getWriter ();
out.println("<html>");
out.println("<head>");
out.println("<title>Servlet main</title>");
out.println("</head>");
out.println("<body>");
out.println("<h1>Our count is " + Integer.toString (secondSessionBean.getCnt ()) + "</h1>");
out.println("</body>");
out.println("</html>");
out.close ();
protected void doGet (HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException
processRequest (request, response);
protected void doPost (HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException
processRequest (request, response);
}You are injecting a reference to a stateful session bean to an instance variable in the servlet. This bean instance is shared by all servlet request, and that's why you are seeing this odd behavior.
You can use type-leve injection for the stateful bean, and then lookup the bean inside your request-processing method. You may also save this bean ref in HttpSession.
@EJB(name="ejb/foo", beanName="SecondBean", beanInterface="com.foo.foo.SecondBeanRemote")
public MyServlet extends HttpServlet {
ic.lookup("java:comp/env/ejb/foo");
} -
Problem with the socket and the standard output stream
Hy, I have a little problem with a socket program. It has the server and the client. The problem is that the client at one point in the program, cannot print messages in the console.
My program does the next: the server waits connections, when a client connects to it, the server gets outputstream to the socket and writes two strings on it. Meanwhile, the client gets the inputstream to the socket and reads on it with a loop the two strings written by the server . The strings are printed by the client in the console. The problem starts here; once the read strings are printed ,I mean, after the loop, there are other System.out.println in the client but the console doesnt print anything . It curious that only when I comment on the server code the line that says: "br.readLine()" just before the catch, the client prints all the System.out.println after the loop but why?
Here is the code:
Server code:
public class MyServerSocket {
public MyServerSocket() {
try{
ServerSocket server= new ServerSocket(2000);
System.out.println("servidor iniciado");
Socket client=server.accept();
System.out.println("Client connected");
OutputStream os=client.getOutputStream();
PrintWriter pw= new PrintWriter(os);
String cadena1="cadena1";
String cadena2="cadena2";
pw.println(cadena1);
pw.println(cadena2);
pw.flush();
InputStream is=client.getInputStream();
InputStreamReader isr= new InputStreamReader(is);
BufferedReader br= new BufferedReader(isr);
br.readLine(); //If a comment this line, the client prints after the loop, all the System.out....
catch (IOException e) {
// TODO: handle exception
public static void main(String[] args) {
new MyServerSocket
Client code:
public class MyClientSocket {
public MyClientSocket () {
try{
Socket client= new Socket("localhost",2000);
InputStream is=client.getInputStream();
InputStreamReader isr= new InputStreamReader(is);
BufferedReader br= new BufferedReader(isr);
String read;
while((read=br.readLine())!=null){
System.out.println(read);
//These messages are not printed unless I comment the line I talked about in the server code
System.out.println("leido");
System.out.println("hola");
}catch (IOException e) {
public static void main(String[] args) {
new MyClientSocket
}You are right but with this program the loop ends. As you see, the first class, the Server, writes to the socket one text file. The second class, the client, reads the text file in his socket written by the server and writes it to a file in his machine.
NOTE: The loop in the client ends and the server doesnt make any close() socket or shutdownOutput() .
public class ServidorSocketFicheromio {
public ServidorSocketFicheromio() {
try{
ServerSocket servidor= new ServerSocket(2000);
System.out.println("servidor iniciado");
Socket cliente=servidor.accept();
System.out.println("cliente conectado");
OutputStream os=cliente.getOutputStream();
PrintWriter pw= new PrintWriter(os);
File f = new File("c:\\curso java\\DUDAS.TXT");
FileReader fr= new FileReader(f);
BufferedReader br= new BufferedReader(fr);
String leido;
while((leido=br.readLine())!=null){
pw.println(leido);
pw.flush();
}catch (IOException e) {
* @param args
public static void main(String[] args) {
new ServidorSocketFicheromio();
public class ClienteSocketFicheromio {
public ClienteSocketFicheromio() {
try{
Socket cliente= new Socket("localhost",2000);
File f = new File("G:\\pepe.txt");
FileWriter fw= new FileWriter(f);
PrintWriter pw= new PrintWriter(fw);
InputStream is=cliente.getInputStream();
InputStreamReader isr= new InputStreamReader(is);
BufferedReader br= new BufferedReader(isr);
String leido;
while((leido=br.readLine())!=null){
pw.println(leido);
System.out.println(leido);
System.out.println("leido");
System.out.println("hola");
pw.flush();
}catch (IOException e) {
public static void main(String[] args) {
new ClienteSocketFicheromio();/
} -
Hello, I have a problem with writing a file. My code is very simple..it takes a line from one file, a line from a second file, combines them, and writes them into the third file. However, the program never gets past the point where it creates the output file. Any help is appreciated.
import java.io.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class MergeFiles extends JApplet implements ActionListener
private final String filename = "mergedfiles.txt";
BufferedReader f1in, f2in;
FileOutputStream outputstream;
JTextField f1f = new JTextField("file1.txt", 20);
JTextField f2f = new JTextField("file2.txt", 20);
String F1text, F2text, F3text;
JLabel title = new JLabel("Merge files program! Press enter to merge!");
JButton merge = new JButton("MERGE! MERGE! MERGE!");
JLabel labelone = new JLabel("File one");
JLabel labeltwo = new JLabel("File two");
Container con = getContentPane();
JPanel pane = new JPanel();
GridBagConstraints c = new GridBagConstraints();
public void makedisplay()
Insets i = new Insets(10, 10, 10, 10);
pane.setLayout(new GridBagLayout());
pane.setBackground(Color.green);
con.setBackground(Color.green);
con.add(pane, BorderLayout.CENTER);
con.add(title, BorderLayout.NORTH);
c.weightx = 0;
c.insets = i;
c.gridy = 0;
c.gridx = 0;
pane.add(labelone, c);
c.gridx = 1;
pane.add(labeltwo, c);
c.gridx = 0;
c.gridy = 1;
c.ipadx = 50;
pane.add(f1f, c);
c.gridx = 1;
pane.add(f2f, c);
c.gridx = 0;
c.gridy = 2;
c.gridwidth = 3;
c.ipadx = 0;
pane.add(merge, c);
public void init()
makedisplay();
merge.addActionListener(this);
public void actionPerformed(ActionEvent e)
openfiles();
File f = new File("H://mergefiles//mergedfile.txt");
try {
title.setText("AAA");
BufferedWriter out = new BufferedWriter(new FileWriter(f));
F1text = f1in.readLine();
F2text = f2in.readLine();
title.setText("BBB");
F3text = "" + F1text + F2text;
out.write("" + F3text);
f1in.close();
f2in.close();
out.close();
catch (IOException ex)
public void openfiles()
try
BufferedReader f1in = new BufferedReader(new FileReader(f1f.getText()));
title.setText("file one opened");
catch (FileNotFoundException e)
title.setText("File one not found!");
try
BufferedReader f2in = new BufferedReader(new FileReader(f2f.getText()));
title.setText("File two opened");
catch (FileNotFoundException e)
title.setText("File two not found!");
}Nevermind, I've fixed the problem...for some reason you can't use the writer with an applet. I've written some new code that works:
import java.io.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class MergeFiles2
static String F1L = "", F2L = "";
static File file1 = new File("H://mergefiles//file1.txt");
static File file2 = new File("H://mergefiles//file2.txt");
public static void main(String[] args) throws IOException
PrintWriter out = new PrintWriter(new FileWriter("file3.txt"));
BufferedReader f1in = new BufferedReader(new FileReader(file1));
BufferedReader f2in = new BufferedReader(new FileReader(file2));
while (F1L != null)
F1L = f1in.readLine();
if (F1L != null)
out.println(F1L);
while (F2L != null)
F2L = f2in.readLine();
if (F2L != null)
out.println(F2L);
out.close();
} -
I have problem with the following code:
class Week10Q4
static PrintWriter out=new PrintWriter(System.out,true);
static boolean receivingInput(int anInput)throws NegativeNumberException
out.println("receiveing answer "+anInput);
if (anInput<0)throw new NegativeNumberException("cannot negative");
out.println("input rejected pls try again!");
return false;
else
out.println("input accepted!");
return true;
/*if(anInput==0)throw new IllegalNumberException();
out.println("pls try again!");
return false;
the output of this is the following error message:
Week10Q4.java:15: 'else' without 'if'
else
in the question ask i was supposed to throw NegativeNumberException if the value of
anInput is less than 0....
can anyone modify this code???The problem is this statement, reformatted to show the blocks you actually did:
if (anInput < 0)
throw new NegativeNumberException("cannot negative");
// now here you started a new block, and put a dangling 'else' at the end of it...
out.println("input rejected pls try again!");
return false;
else ...Furthermore, if you want to throw an exception, you can't both throw one and return a value. So I think you want this...
if (anInput < 0)
throw new NegativeNumberException("cannot be negative");
// if you get here, it is non-negative
out.println("input accepted!");
return true;That said, the only possible return value is 'true', so you might as well change the method to return 'void' instead. -
I am having problems with writing to my file.
Here's my code
* Proj4nrh.java
* Created on November 4, 2007, 2:49 PM
* To change this template, choose Tools | Template Manager
* and open the template in the editor.
package proj4nrh;
* @author Nate
import java.util.Scanner;
import java.io.*;
public class Proj4nrh {
/** Creates a new instance of Proj4nrh */
public Proj4nrh() {
* @param args the command line arguments
public static void main(String[] args) throws IOException{
double [][] data = new double [12][31];
double [][] getPrecipitationData = new double [12][31];
double [] computeMonthlyPrecipitation;
String [] checkIfAverage = new String [12];
String [] months = {"January", "Feburary", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"};
double monthlyAverage = 0;
int y = 0;
data = getPrecipitationData();
computeMonthlyPrecipitation = computeMonthlyPrecipitation(data);
monthlyAverage = calculateAverage(computeMonthlyPrecipitation);
double tenPercentBelow = 0;
double tenPercentAbove, tenPercentTemp = 0;
tenPercentTemp = ((monthlyAverage*10)/100);
tenPercentBelow = (monthlyAverage - tenPercentTemp);
tenPercentAbove = (monthlyAverage + tenPercentTemp);
do {
if (computeMonthlyPrecipitation[y]>=tenPercentBelow && computeMonthlyPrecipitation[y]<=tenPercentAbove) {
checkIfAverage[y] = "Average";}
if (computeMonthlyPrecipitation[y] > tenPercentAbove) {
checkIfAverage[y] = "Above Average";}
if (computeMonthlyPrecipitation[y] < tenPercentBelow) {
checkIfAverage[y] = "Below Average";}
y++;
while (y<computeMonthlyPrecipitation.length);//PRINTWRITER
PrintWriter outFile = new PrintWriter("RESULTS.txt");
for (int i=0; i<computeMonthlyPrecipitation.length; i++){
System.out.println(months);
outFile.printf("%9s %5.2f", months [i], computeMonthlyPrecipitation[i], checkIfAverage[i]);
outFile.println();
outFile.close();//Printwriter not writing to file!
public static double[][] getPrecipitationData() throws IOException {
int rows, cols;
File getFile = new File("PRECIP.txt");
Scanner inFile = new Scanner(getFile);
double [][] data = new double [12][31];
for (int y=0; y<data.length; y++) {
cols = inFile.nextInt();
data [y] = new double [cols];
for (int x=0; x<data[y].length; x++) {
data[y][x] = inFile.nextDouble();
return data;
public static double [] computeMonthlyPrecipitation(double [][] data){
double [] computeMonthlyPrecipitation = new double [12];
double sum = 0;
for (int y=0; y<data.length; y++) {
for (int x=0; x<data[y].length; x++) {
sum = sum + data [y][x];
computeMonthlyPrecipitation[y] = sum;
sum = 0;
return computeMonthlyPrecipitation;}
public static double calculateAverage(double[] computeMonthlyPrecipitation){
double monthlyAverage = 0;
double sum = 0;
for (int y=0; y<computeMonthlyPrecipitation.length; y++) {
sum = sum + computeMonthlyPrecipitation[y];
} monthlyAverage = sum/(computeMonthlyPrecipitation.length);
return monthlyAverage;
I am trying to print like this:
months [0] computeMonthlyPrecipitation[0] checkIfAverage[0]
months [1] computeMonthlyPrecipitation[1] checkIfAverage[1]
months [2] computeMonthlyPrecipitation[2] checkIfAverage[2]
...etc.Edited by: nhuff90 on Nov 11, 2007 11:39 AMThanks for the advice.
I changed the variable to computedMonthlyPrecipitation, but I have not learned classes yet.
But you said that computedMonthlyPrecipitation is probably 0, but the following code run the do-while twelve time(which is what I want) and it depends on the while(y<computedMonthlyPrecipitation.length)
do {
if (computedMonthlyPrecipitation[y]>=tenPercentBelow && computedMonthlyPrecipitation[y]<=tenPercentAbove) {
checkIfAverage[y] = "Average";}
if (computedMonthlyPrecipitation[y] > tenPercentAbove) {
checkIfAverage[y] = "Above Average";}
if (computedMonthlyPrecipitation[y] < tenPercentBelow) {
checkIfAverage[y] = "Below Average";}
y++;
while (y<computeMonthlyPrecipitation.length);I also tried to hard core the printwriter to 12 and it did not work.
PrintWriter outFile = new PrintWriter("RESULTS.txt");
for (int i=0; i<12; i++){
System.out.println(months);
outFile.printf("%9s %5.2f", months [i], computedMonthlyPrecipitation[i], checkIfAverage[i]);
outFile.println();
outFile.close();
Thanks
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