Inputstream.....help me...
Hi guys,
i've a question for you.
My Jsf Application allow user to upload a txt file thanks to a Myfaces
component.
I want manipulate later this file and i know that exist getInputStream
function that allow it.
My question is that i have to add to my application a java class that
does some operations on the file that i have uploaded.
The matter is that my application load a file in a bufferedReader with
BufferedReader br = new BufferedReader(file);
How can i put the inputstream of my uploaded file in the bufferedReader
to reuse my java application?
Please help me,i'm a newbie..excuse me for my english
Use FileInputStream
Similar Messages
-
Parse XML in inputstream, help!
From a socket, I get a XML from the inputstream, in the XML it has many tages called "City", I want to take all the Citys out and put them in an array, there is something with my code, who can fix it?
import java.io.*;
import java.net.*;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.InputSource;
public class TCPClient {
public static void main(String argv[])throws Exception {
final int HTTP_PORT=80;
Socket socket1 = new Socket("www.webservicex.net", HTTP_PORT);
BufferedWriter out= new BufferedWriter(new OutputStreamWriter(socket1.getOutputStream(), "UTF8"));
// BufferedReader in= new BufferedReader(new InputStreamReader(socket1.getInputStream()));
out.write("POST http://www.webservicex.net/globalweather.asmx/GetCitiesByCountry HTTP/1.0\r\n");
out.write("Host: www.webservicex.net\r\n");
out.write("Content-Type: application/x-www-form-urlencoded\r\n");
String body = "CountryName=china";
out.write("Content-Length: " + body.length() + "\r\n");
out.write("\r\n");
out.write(body);
out.flush();
InputStreamReader inputStream = new InputStreamReader(socket1.getInputStream());
System.out.println("Encoding is " + inputStream.getEncoding());
BufferedReader in = new BufferedReader(inputStream);
String xmlString="";
String line;
while((line=in.readLine())!=null){
xmlString+=line;
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
DocumentBuilder db = dbf.newDocumentBuilder();
Document document = db.parse(new InputSource(new StringReader(xmlString)));
NodeList nl = document.getElementsByTagName("City");
for (int count = 0; count < nl.getLength(); count++) {
Node n = nl.item(count);
System.out.println(n);
out.close();
in.close();
}There are no "City" elements in the XML. In fact, as with your post yesterday, there is very very little in the XML.
Also, there is no need to create a String of the response. You can use the reader directly to in the InputSource.
Edited by: sabre150 on Aug 11, 2009 1:08 PM -
Error in feeding JMF with inputstream, please help
Hi,
in order to feed JMF with inputstreams, audioinputstreams actually, you have to modify the DataSource.java and write a custom one so that it accepts inputstreams for the construction of the datasource, because with MediaLocator you can only specify existing files in the hard disk or somewhere in the network.
Searching I found this ByteBufferDataSource, which allows you to construct a DataSource from a ByteBuffer object.
The problem is that when using it and trying to send the stream via RTP to another machine, i get the following error:
Exception in thread "JMF thread: com.sun.media.ProcessEngine@d6a05e[ com.sun.media.ProcessEngine@d6a05e ] ( configureThread)" java.lang.NullPointerException
at com.sun.media.ProcessEngine.isRTPFormat(ProcessEngine.java:99)
at com.sun.media.ProcessEngine.reenableHintTracks(ProcessEngine.java:107)
at com.sun.media.ProcessEngine.doConfigure(ProcessEngine.java:63)
at com.sun.media.ConfigureWorkThread.process(BasicController.java:1370)
at com.sun.media.StateTransitionWorkThread.run(BasicController.java:1339)
This error has appeared in some other post, but haven�t found the solution to it, I guess is something to do with the file format.
So please, I really need your help with this, as I�m getting stuck in a academical project because of this. I attach the bytebufferdatasource
Thank you for your time,
bye
import javax.media.protocol.ContentDescriptor;
import javax.media.protocol.PullDataSource;
import java.nio.ByteBuffer;
import java.io.IOException;
import javax.media.MediaLocator;
import javax.media.Duration;
import javax.media.Time;
* @author Chad McMillan
public class ByteBufferDataSource extends PullDataSource {
protected ContentDescriptor contentType;
protected SeekableStream[] sources;
protected boolean connected;
protected ByteBuffer anInput;
protected ByteBufferDataSource(){
* Construct a <CODE>ByteBufferDataSource</CODE> from a <CODE>ByteBuffer</CODE>.
* @param source The <CODE>ByteBuffer</CODE> that is used to create the
* the <CODE>DataSource</CODE>.
public ByteBufferDataSource(ByteBuffer input, String contentType) throws IOException {
anInput = input;
this.contentType = new ContentDescriptor(contentType);
connected = false;
* Open a connection to the source described by
* the <CODE>ByteBuffer/CODE>.
* <p>
* The <CODE>connect</CODE> method initiates communication with the source.
* @exception IOException Thrown if there are IO problems
* when <CODE>connect</CODE> is called.
public void connect() throws java.io.IOException {
connected = true;
sources = new SeekableStream [1];
sources[0] = new SeekableStream(anInput);
* Close the connection to the source described by the locator.
* <p>
* The <CODE>disconnect</CODE> method frees resources used to maintain a
* connection to the source.
* If no resources are in use, <CODE>disconnect</CODE> is ignored.
* If <CODE>stop</CODE> hasn't already been called,
* calling <CODE>disconnect</CODE> implies a stop.
public void disconnect() {
if(connected) {
sources[0].close();
connected = false;
* Get a string that describes the content-type of the media
* that the source is providing.
* <p>
* It is an error to call <CODE>getContentType</CODE> if the source is
* not connected.
* @return The name that describes the media content.
public String getContentType() {
if( !connected) {
throw new java.lang.Error("Source is unconnected.");
return contentType.getContentType();
public Object getControl(String str) {
return null;
public Object[] getControls() {
return new Object[0];
public javax.media.Time getDuration() {
return Duration.DURATION_UNKNOWN;
* Get the collection of streams that this source
* manages. The collection of streams is entirely
* content dependent. The MIME type of this
* <CODE>DataSource</CODE> provides the only indication of
* what streams can be available on this connection.
* @return The collection of streams for this source.
public javax.media.protocol.PullSourceStream[] getStreams() {
if( !connected) {
throw new java.lang.Error("Source is unconnected.");
return sources;
* Initiate data-transfer. The <CODE>start</CODE> method must be
* called before data is available.
*(You must call <CODE>connect</CODE> before calling <CODE>start</CODE>.)
* @exception IOException Thrown if there are IO problems with the source
* when <CODE>start</CODE> is called.
public void start() throws IOException {
* Stop the data-transfer.
* If the source has not been connected and started,
* <CODE>stop</CODE> does nothing.
public void stop() throws IOException {
}Sorry for the formatting, I attach it again here with well format:
the error was:
Exception in thread "JMF thread: com.sun.media.ProcessEngine@d6a05e[ com.sun.media.ProcessEngine@d6a05e ] ( configureThread)" java.lang.NullPointerException
at com.sun.media.ProcessEngine.isRTPFormat(ProcessEngine.java:99)
at com.sun.media.ProcessEngine.reenableHintTracks(ProcessEngine.java:107)
at com.sun.media.ProcessEngine.doConfigure(ProcessEngine.java:63)
at com.sun.media.ConfigureWorkThread.process(BasicController.java:1370)
at com.sun.media.StateTransitionWorkThread.run(BasicController.java:1339)
and the java file for generating the datasource from the bytebuffer was:
import javax.media.protocol.ContentDescriptor;
import javax.media.protocol.PullDataSource;
import java.nio.ByteBuffer;
import java.io.IOException;
import javax.media.MediaLocator;
import javax.media.Duration;
import javax.media.Time;
* @author Chad McMillan
public class ByteBufferDataSource extends PullDataSource {
protected ContentDescriptor contentType;
protected SeekableStream[] sources;
protected boolean connected;
protected ByteBuffer anInput;
protected ByteBufferDataSource(){
* Construct a <CODE>ByteBufferDataSource</CODE> from a <CODE>ByteBuffer</CODE>.
* @param source The <CODE>ByteBuffer</CODE> that is used to create the
* the <CODE>DataSource</CODE>.
public ByteBufferDataSource(ByteBuffer input, String contentType) throws IOException {
anInput = input;
this.contentType = new ContentDescriptor(contentType);
connected = false;
* Open a connection to the source described by
* the <CODE>ByteBuffer/CODE>.
* <p>
* The <CODE>connect</CODE> method initiates communication with the source.
* @exception IOException Thrown if there are IO problems
* when <CODE>connect</CODE> is called.
public void connect() throws java.io.IOException {
connected = true;
sources = new SeekableStream [1];
sources[0] = new SeekableStream(anInput);
* Close the connection to the source described by the locator.
* <p>
* The <CODE>disconnect</CODE> method frees resources used to maintain a
* connection to the source.
* If no resources are in use, <CODE>disconnect</CODE> is ignored.
* If <CODE>stop</CODE> hasn't already been called,
* calling <CODE>disconnect</CODE> implies a stop.
public void disconnect() {
if(connected) {
sources[0].close();
connected = false;
* Get a string that describes the content-type of the media
* that the source is providing.
* <p>
* It is an error to call <CODE>getContentType</CODE> if the source is
* not connected.
* @return The name that describes the media content.
public String getContentType() {
if( !connected) {
throw new java.lang.Error("Source is unconnected.");
return contentType.getContentType();
public Object getControl(String str) {
return null;
public Object[] getControls() {
return new Object[0];
public javax.media.Time getDuration() {
return Duration.DURATION_UNKNOWN;
* Get the collection of streams that this source
* manages. The collection of streams is entirely
* content dependent. The MIME type of this
* <CODE>DataSource</CODE> provides the only indication of
* what streams can be available on this connection.
* @return The collection of streams for this source.
public javax.media.protocol.PullSourceStream[] getStreams() {
if( !connected) {
throw new java.lang.Error("Source is unconnected.");
return sources;
* Initiate data-transfer. The <CODE>start</CODE> method must be
* called before data is available.
*(You must call <CODE>connect</CODE> before calling <CODE>start</CODE>.)
* @exception IOException Thrown if there are IO problems with the source
* when <CODE>start</CODE> is called.
public void start() throws IOException {
* Stop the data-transfer.
* If the source has not been connected and started,
* <CODE>stop</CODE> does nothing.
public void stop() throws IOException {
} -
Unable to understand InputStream.available() method, need some help
dear friends,
The following is my doubt. please kindly help me in this. this will help me a lot in understanding some consepts.
Environment: i am using jdk1.4.1_01 on windowsxp.
i am using IE6.0 to make requets.
My requirement:
what i am actually trying to do is i want to see the raw material
send by the browser when we made a request to the server
by the browser.basically i want to see the request line
and headers as it is that is send by the browser to the server.
so i thought to code a server that can print the request send
by the browser as it is on the command window.
i had taken two examples and i am running Server2.java (look at the bottom for this code)and i made a 25 requests to the server2 program
which is running on port 8080 by the browser. here only once or twice in 25
times i was able to see the requests send by the browser.i tried hard and
found that InputStream.available() method is returning 0 even though the
request is sucessfully send to the port 8080 that is to the server2 program
which is listening to port 8080.
so in this process of experimenting i took Server3.java(i am sending this file
also as an attachment) which is using multithreading. in this also i did modification
as i did in Server2.java. the thing is here i am able to succed. here
InputStream.available method is returning the correct number of bytes
that are arrived on the port and are available to the InputStream.here
when ever i made a request from the browser to Server3.java i am able to
see the raw data send by the browser without failure.
i could not understand why InputStream.available() is returning 0
often(not all the time) and why it is giving the desired result when i
used it in Server3.java ?
i looked into the documentation and it says " InputStream.available() Returns the number of bytes that can be read (or skipped over) from this input stream without blocking
by the next caller of a method for this input stream."
so the thing i could not understand is what is blocking the InputStream
in the first case.if i could undrstand the internals of how this
method is working it will help me a lot.if i could understand this i
will know what is the right situations to use this method.
Thanking You.
/*Shows how to develop a simple network server
Author : Team -J
Version : 1.0 */
import java.net.*;
import java.io.*;
class Server2{
static public void main(String[] args)throws Exception{
// create a new Server Socket
try{
ServerSocket ss = new ServerSocket(8080,1);
while(true){// set queue length to 1
// wait for the connections
Socket s = ss.accept();
// get the output stream associated with socket
// to write something to the socket
PrintStream ps =new PrintStream( s.getOutputStream());
InputStream is = s.getInputStream();
ps.println("I am ready to provide xxx Service");
int len=is.available();
if(len !=0)
byte b [] = new byte[len];
int k =is.read(b,0,(len-1));
for(int i =0;i<k;i++)
char c = (char)b;
System.out.print(c);
// close the connection
is.close();
s.close();
}catch(Exception e){}
/*Shows how to develop a simple network server
Author : Team -J
Version : 1.0 */
import java.net.*;
import java.io.*;
class Server3{
static public void main(String[] args)throws Exception{
// create a new Server Socket
try{
ServerSocket ss = new ServerSocket(8080,1);
while(true){
// wait for the connections
Socket s = ss.accept();
ServerThread st = new ServerThread(s);
st.start();
}catch(Exception e){}
class ServerThread extends Thread{
Socket s;
public ServerThread(Socket s){
this.s = s;
public void run(){
try{
PrintStream ps =new PrintStream( s.getOutputStream());
InputStream is = s.getInputStream();
int len=is.available();
ps.println("I am ready to provide xxx Service");
if(len!=0)
byte b [] = new byte[len];
int k =is.read(b,0,(len-1));
for(int i =0;i<k;i++)
char c = (char)b[i];
System.out.print(c);
is.close();
s.close();
}catch(Exception e){}so the thing i could not understand is what is
t is blocking the InputStream
in the first case.Blocking means the thread goes to sleep waiting for more data to arrive. InputStream.available() shows how many bytes have already arrived, not how many remain to be sent. -
InputStream / OutputStream Help
I have in a series 10 commands to be executed on a server. so i am using Buffered OutputStream and DataOutputStream to write those commands to server.
these commands have a set of protocol rule to be followed.
for example i am creating a byte array and i am appending those protocol rules to the byte array and then finally to the stream and then writing to the socket of the server.
everything works fine here.
After that i must read the messages from the server.
this is also fine but t�he problem is everytime i read different input for each command.
i dont know why!!!!
so my read function is as follows,
import java.net.*;
public class xxxxx
InputStream instream;
OutputStream outstream;
public void OpenConnection() throws ConnectException,UnknownHostException
try
tcpipSocket = new Socket(tcpipparameters.getIpAddress(),tcpipparameters.getPortNumber());
catch(IOException exception)
System.out.println(exception.toString());
try
outstream = tcpipSocket.getOutputStream();
instream = tcpipSocket.getInputStream();
dos = new DataOutputStream(outstream);
BufferedOutputStream bos= new BufferedOutputStream(dos);
dis = new DataInputStream(instream);
BufferedInputStream bis = new BufferedInputStream(dis);
////////// now i start the command execution on the server
///// The 1st Command --------------(The INIT Command)
byte[] init = {0,6,0,2};
init = createMessage.calculateCheckSum(init);
int len = init.length;
//dos.write(init,0,len);
bos.write(init);
bos.flush();
int available;
while((available = bis.available()) > 0)
byte[] data = new byte[available];
bis.read(data);
for(int i = 0 ; i < data.length; i++)
System.out.print(data);
////////////////// The 2nd Command -------------------(IDENTIFY)
byte[] identify = {0,16,0,20};
// The protocol version number is inserted in to the IDENTIFY byte[]array
int protocol_version_number = 512;
byte[] protocol = {(byte)(protocol_version_number/256) ,(byte)(protocol_version_number%256) };
byte[] temp = new byte[ identify.length + protocol.length] ;
System.arraycopy( identify, 0, temp, 0, identify.length ) ;
System.arraycopy(protocol, 0, temp, identify.length, protocol.length ) ;
identify = temp ;
String PR_SName = "PRS2.0";
identify = createString.stringData(identify,PR_SName);
identify = createMessage.calculateCheckSum(identify);
len = identify.length;
bos.write(identify);
bos.flush();
int length1 = bis.available();
System.out.println("length of the BufferedInputStream = " + length1);
StringBuffer sb = new StringBuffer();
for (int i=1; i<=length1; i++)
char reply = (char)bis.read();
sb.append(reply);
System.out.println(sb.toString());
////////////////// The 3rd Command and So on................................
catch(IOException exception)
System.err.println("message = " + exception.getMessage());
catch(InterruptedException e)
System.err.println("Error =" + e);
finally
try
//flush and close both "Instream" and "Outstream"
dos.close();
dis.close();
instream.close();
outstream.close();
catch (IOException ex)
ex.printStackTrace();
every time the reading from the server is different.
but i want to have the exact number of bytes to read everytime.
so please correct me where i am wrong.
With regards,
Ashok
public void CloseConnection()throws IOException
tcpipSocket.close();I would say the answer is in my previous replies to your question. I suggest you have another read of them.
-
Help with jars webstart and InputStream
I am currently attempting to fix all the things that break
the minute you attempt to use a jar under webstart.
I have attempted to find an answer by searching the forums.
I cannot determine how to overcome the following.
I have third party jars for "Jasper reports" and the loadReport
function requires a java.io.InputStream as input.
"public static JasperReport loadReport(java.io.InputStream inputStream) throws JRException"
The report templates are in my jar file in a sub directory "\sreports".
I was loading the template with the following code.
JasperReport template = JasperManager.loadReport(new FileInputStream(reportFile));
Where
String reportFile = ".\\sreports\\Std"+tableName+".jasper";
I have tried several things including below.
FileInputStream fs = new FileInputStream(getClass().getResource("sreports/StdEquipmentType.jasper"));
which does not even complile.
RykkGet your input stream like:
InputStream in = getClass().getResourceAsStream("path/to/file.txt");
note that you use "/" and not "\" or "\\" no matter what OS you are using. -
Hi,
I m defining a BufferedReader and a Inputstream. for example:
in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
inStream = socket.getInputStream();
The BufferedReader is use for reading Strings but i also must read an array of bytes . But when i do inStream.read(bytes) . He gets stuck. Reading like in.readLine() works but then i havent got the array of bytes. So isnt it possible too use both inputstreams ?I'd guess trying to read the same stream from two
different readers at the same time is bad news. Can
you read the bytes, then make a reader based on the
byte array?I think i ve found the solution . I send a string for example :
This is an example. \r\n This is a tes. \r\n byteeeeees
Now when i use in.readLine(). Then everything what is send so far is encoded using Unicode . So also the bytes of my file. When i m trying to use reading from inputstream then he waits because stream is empty. -
InputStream........ Help plz....
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.net.*;
import javax.imageio.*;
import java.net.Socket;
import javax.swing.ImageIcon;
class clients extends Object implements java.io.Serializable
byte[] ml;
public class CustomerApplet extends JApplet implements java.io.Serializable
Image img;
ImageIcon icon;
public void init()
Container contentPane=getContentPane();
ImageIcon icon;
try
Socket toServer;
toServer=new Socket("192.168.1.211",1001);
BufferedReader fromServer=new BufferedReader(new InputStreamReader(toServer.getInputStream()));
int n;
ByteArrayOutputStream a=new ByteArrayOutputStream();
InputStream is=null;
byte[] b=new byte[200];
try
while((n = is.read(b)) != -1)
a.write(b,0,n);
catch (Exception e)
System.err.println("Exception : "+e);
byte[] xml = a.toByteArray();
try
icon = new ImageIcon(xml);
getAppletContext().showStatus("geting data");
catch(Exception e)
System.out.println("Failed to create URL:\n" + e);
return;
fromServer.close();
JLabel j1=new JLabel(icon,JLabel.CENTER);
contentPane.add(j1);
catch(InvalidClassException e)
getAppletContext().showStatus("the client class is invalid"+e);
catch(NotSerializableException e)
getAppletContext().showStatus("the object is not serializable"+e);
catch(IOException e)
getAppletContext().showStatus("Cannot write to the server"+e);
}can anyone tell me what must the InputStream in the code above be.........
Thanks in Advance......
Uzair........i do not understand.......
may i know what must it be.....
OutputStream pictStream=
And the context of that would be what? I see no pictStream in your code, in the first place.
If someone were to just ask you the same kind of question, would you know what to say?
I have to conclude that uzair == troll now. A real programmer nor even a wanna-be can't be that brain-dead. Goodbye. -
How can I convert an InputStream to a FileInputStream ???
How can I convert an InputStream to a FileInputStream ???
Thanks for you reply, however, I am still stuck.
I am trying to convert my application (which runs smoothly) to a signed applet. The following is the original (application) code:
private void loadConfig() {
String fileName = "resources/groupconfig";
File name = new File(fileName);
if(name.isFile()) {
try {
ObjectInputStream in = new ObjectInputStream(new FileInputStream(fileName));
pAndGConfig = (PAGroupsConfig)in.readObject();
in.close();
return;
} catch(ClassNotFoundException e) {
System.err.println("++ERROR: "+e);
} catch(IOException e) {
System.err.println("++ERROR: "+e);
System.out.println("Can't find file: " + fileName);
Because all code and resources now reside in a Jar file (for the signed applet), I must use the following line to access the resources:
InputStream is = this.getClass().getResourceAsStream(fileName);
I then need to convert the 'InputStream' to 'ObjectInputStream' or 'FileInputStream' so that I can work with it.
I would be very grateful if you could help shed some light on the matter - Cobram -
Error in creating a process using runtime class - please help
Hi,
I am experimenting with the following piece of code. I tried to run it in one windows machine and it works fine. But i tried to run it in a different windows machine i get error in creating a process. The error is attached below the code. I don't understand why i couldn't create a process with the 'exec' command in the second machine. Can anyone please help?
CODE:
import java.io.*;
class test{
public static void main(String[] args){
try{
Runtime r = Runtime.getRuntime();
Process p = null;
p= r.exec("dir");
BufferedReader br = new BufferedReader(new InputStreamReader(p.getInputStream()));
System.out.println(br.readLine());
catch(Exception e){e.printStackTrace();}
ERROR (when run in the dos prompt):
java.io.IOException: CreateProcess: dir error=2
at java.lang.Win32Process.create(Native Method)
at java.lang.Win32Process.<init>(Win32Process.java:63)
at java.lang.Runtime.execInternal(Native Method)
at java.lang.Runtime.exec(Runtime.java:550)
at java.lang.Runtime.exec(Runtime.java:416)
at java.lang.Runtime.exec(Runtime.java:358)
at java.lang.Runtime.exec(Runtime.java:322)
at test.main(test.java:16)
thanks,
DivyaAs much as I understand from the readings in the forums, Runtime.exec can only run commands that are in files, not native commands.
Hmm how do I explain that again?
Here:
Assuming a command is an executable program
Under the Windows operating system, many new programmers stumble upon Runtime.exec() when trying to use it for nonexecutable commands like dir and copy. Subsequently, they run into Runtime.exec()'s third pitfall. Listing 4.4 demonstrates exactly that:
Listing 4.4 BadExecWinDir.java
import java.util.*;
import java.io.*;
public class BadExecWinDir
public static void main(String args[])
try
Runtime rt = Runtime.getRuntime();
Process proc = rt.exec("dir");
InputStream stdin = proc.getInputStream();
InputStreamReader isr = new InputStreamReader(stdin);
BufferedReader br = new BufferedReader(isr);
String line = null;
System.out.println("<OUTPUT>");
while ( (line = br.readLine()) != null)
System.out.println(line);
System.out.println("</OUTPUT>");
int exitVal = proc.waitFor();
System.out.println("Process exitValue: " + exitVal);
} catch (Throwable t)
t.printStackTrace();
A run of BadExecWinDir produces:
E:\classes\com\javaworld\jpitfalls\article2>java BadExecWinDir
java.io.IOException: CreateProcess: dir error=2
at java.lang.Win32Process.create(Native Method)
at java.lang.Win32Process.<init>(Unknown Source)
at java.lang.Runtime.execInternal(Native Method)
at java.lang.Runtime.exec(Unknown Source)
at java.lang.Runtime.exec(Unknown Source)
at java.lang.Runtime.exec(Unknown Source)
at java.lang.Runtime.exec(Unknown Source)
at BadExecWinDir.main(BadExecWinDir.java:12)
As stated earlier, the error value of 2 means "file not found," which, in this case, means that the executable named dir.exe could not be found. That's because the directory command is part of the Windows command interpreter and not a separate executable. To run the Windows command interpreter, execute either command.com or cmd.exe, depending on the Windows operating system you use. Listing 4.5 runs a copy of the Windows command interpreter and then executes the user-supplied command (e.g., dir).
Taken from:
http://www.javaworld.com/javaworld/jw-12-2000/jw-1229-traps.html -
I am really sorry but I am still stuck. Please help.
Please can someone help me with the following code. I have a number of questions. So far all buttons that I have coded actions for work fine. When The program saves it does it correctly as I have seen the text file. However I have some problems.
1) How can I declare the arrays in another way without setting them to "" when the program starts. I need the program to start and show the previous saved arrays instead. I dont know if my method used for retrieving data from the file is correct either?.
2) When retrieving the values from a file that has example (all are string values). ADAM SANDLER 111 222 333 MICKY MOUSE 222 444 666
Where I want them to be in the follwing arrays as an example.
String name[1] = ADAM
String surname[1] = SANDLER
String home[1] = 111
String work[1] = 222
String cell[1] = 333
String name[2] = MICKY
String surname[2] = MOUSE
String home[2] = 222
String work[2] = 444
String cell[2] = 666
Here is my code.
Filename: ContactsListInterface.java
Date: 16 March 2008
Programmer: Yucca Nel
Purpose: Provides a GUI for entering names and contact numbers into a telephone directory.
Also allows options for searching for a specific name and deleting of data from the record
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.text.*;
import java.io.*;
import java.util.*;
import java.text.*;
public class ContactsListInterface extends JFrame implements ActionListener
{ //start of class
// Declare outputstream and inputStream
DataOutputStream output;
DataInputStream input;
String filename = "phonebook";
// construct fields, buttons, labels and text boxes
JTextPane displayPane = new JTextPane();
JLabel listOfContacts = new JLabel("List Of Contacts"); // creates a label for the scrollpane
JButton createButton = new JButton("Create");
JButton searchButton = new JButton("Search");
JButton modifyButton = new JButton("Modify");
JButton deleteButton = new JButton("Delete");
// declare data arrays for name, surname, work number, home number and cell number
private String name[] = {""};
private String surname[] = {""};
private String home[] = {""};
private String work[] = {""};
private String cell[] = {""};
// create an instance of the ContactsListInterface
public ContactsListInterface()
{ // start of cli()
super("Phonebook Interface");
} // end of cli()
public JMenuBar createMenuBar()
{ // start of the createMenuBar()
// construct and populate a menu bar
JMenuBar mnuBar = new JMenuBar(); // creates a menu bar
setJMenuBar(mnuBar);
JMenu mnuFile = new JMenu("File",true); // creates a file menu in the menu bar which is visible
mnuFile.setMnemonic(KeyEvent.VK_F);
mnuFile.setDisplayedMnemonicIndex(0);
mnuFile.setToolTipText("File Options");
mnuBar.add(mnuFile);
JMenuItem mnuFileExit = new JMenuItem("Exit"); // creates an exit option in the file menu
mnuFileExit.setMnemonic(KeyEvent.VK_X);
mnuFileExit.setDisplayedMnemonicIndex(1);
mnuFileExit.setToolTipText("Close Application");
mnuFile.add(mnuFileExit);
mnuFileExit.setActionCommand("Exit");
mnuFileExit.addActionListener(this);
JMenu mnuEdit = new JMenu("Edit",true); // creates a menu for editing options
mnuEdit.setMnemonic(KeyEvent.VK_E);
mnuEdit.setDisplayedMnemonicIndex(0);
mnuEdit.setToolTipText("Edit Options");
mnuBar.add(mnuEdit);
JMenu mnuEditSort = new JMenu("Sort",true); // creates an option for sorting entries
mnuEditSort.setMnemonic(KeyEvent.VK_S);
mnuEditSort.setDisplayedMnemonicIndex(0);
mnuEdit.add(mnuEditSort);
JMenuItem mnuEditSortByName = new JMenuItem("Sort By Name"); // to sort entries by name
mnuEditSortByName.setMnemonic(KeyEvent.VK_N);
mnuEditSortByName.setDisplayedMnemonicIndex(8);
mnuEditSortByName.setToolTipText("Sort entries by first name");
mnuEditSortByName.setActionCommand("Name");
mnuEditSortByName.addActionListener(this);
mnuEditSort.add(mnuEditSortByName);
JMenuItem mnuEditSortBySurname = new JMenuItem("Sort By Surname"); // to sort entries by surname
mnuEditSortBySurname.setMnemonic(KeyEvent.VK_R);
mnuEditSortBySurname.setDisplayedMnemonicIndex(10);
mnuEditSortBySurname.setToolTipText("Sort entries by surname");
mnuEditSortBySurname.setActionCommand("Surname");
mnuEditSortBySurname.addActionListener(this);
mnuEditSort.add(mnuEditSortBySurname);
JMenu mnuHelp = new JMenu("Help",true); // creates a menu for help options
mnuHelp.setMnemonic(KeyEvent.VK_H);
mnuHelp.setDisplayedMnemonicIndex(0);
mnuHelp.setToolTipText("Help options");
mnuBar.add(mnuHelp);
JMenuItem mnuHelpHelp = new JMenuItem("Help"); // creates a help option for help topic
mnuHelpHelp.setMnemonic(KeyEvent.VK_P);
mnuHelpHelp.setDisplayedMnemonicIndex(3);
mnuHelpHelp.setToolTipText("Help Topic");
mnuHelpHelp.setActionCommand("Help");
mnuHelpHelp.addActionListener(this);
mnuHelp.add(mnuHelpHelp);
JMenuItem mnuHelpAbout = new JMenuItem("About"); // creates a about option for info about api
mnuHelpAbout.setMnemonic(KeyEvent.VK_T);
mnuHelpAbout.setDisplayedMnemonicIndex(4);
mnuHelpAbout.setToolTipText("About this program");
mnuHelpAbout.setActionCommand("About");
mnuHelpAbout.addActionListener(this);
mnuHelp.add(mnuHelpAbout);
return mnuBar;
} // end of the createMenuBar()
// create the content pane
public Container createContentPane()
{ // start of createContentPane()
// try blocks for the input and output
try
output = new DataOutputStream(new FileOutputStream(filename));
catch(IOException io)
JOptionPane.showMessageDialog(null,"This program could not create a storage location. Please check the disk drive and the tun the program again.","Error",JOptionPane.ERROR_MESSAGE);
System.exit(1);
//construct and populate panels and content pane
JPanel labelPanel = new JPanel(); // panel is only used to put the label for the textpane in
labelPanel.setLayout(new FlowLayout());
labelPanel.add(listOfContacts);
JPanel displayPanel = new JPanel();// panel is used to display all the contacts and thier numbers
setTabsAndStyles(displayPane);
displayPane = addTextToTextPane();
displayPane.setEditable(false);
JScrollPane scrollPane = new JScrollPane(displayPane);
scrollPane.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS); // pane is scrollable vertically
scrollPane.setWheelScrollingEnabled(true);// pane is scrollable by use of the mouse wheel
scrollPane.setPreferredSize(new Dimension(400,320));
displayPanel.add(scrollPane);
JPanel workPanel = new JPanel();// panel is used to enter, edit and delete data
workPanel.setLayout(new FlowLayout());
workPanel.add(createButton);
createButton.setToolTipText("Create a new entry");
createButton.addActionListener(this);
workPanel.add(searchButton);
searchButton.setToolTipText("Search for an entry by name number or surname");
searchButton.addActionListener(this);
workPanel.add(modifyButton);
modifyButton.setToolTipText("Modify an existing entry");
modifyButton.addActionListener(this);
workPanel.add(deleteButton);
deleteButton.setToolTipText("Delete an existing entry");
deleteButton.addActionListener(this);
labelPanel.setBackground(Color.red);
displayPanel.setBackground(Color.red);
workPanel.setBackground(Color.red);
// create container and set attributes
Container c = getContentPane();
c.setLayout(new BorderLayout(30,30));
c.add(labelPanel,BorderLayout.NORTH);
c.add(displayPanel,BorderLayout.CENTER);
c.add(workPanel,BorderLayout.SOUTH);
c.setBackground(Color.red);
// add a listener for the window closing and save
addWindowListener(
new WindowAdapter()
public void windowClosing(WindowEvent e)
int answer = JOptionPane.showConfirmDialog(null,"Are you sure you would like to save all changes and exit?","File submission",JOptionPane.YES_NO_OPTION);
if(answer == JOptionPane.YES_OPTION)
save();
System.exit(0);
return c;
} // end of createContentPane()
protected void setTabsAndStyles(JTextPane displayPane)
{ // Start of setTabsAndStyles()
// set Font style
Style fontStyle = StyleContext.getDefaultStyleContext().getStyle(StyleContext.DEFAULT_STYLE);
Style regular = displayPane.addStyle("regular", fontStyle);
StyleConstants.setFontFamily(fontStyle, "SansSerif");
Style s = displayPane.addStyle("bold", regular);
StyleConstants.setBold(s,true);
} // End of setTabsAndStyles()
public JTextPane addTextToTextPane()
{ // start of addTextToTextPane()
try
input = new DataInputStream(new FileInputStream(filename));
for(int i=0; i<name.length;i++)
name[i] = input.readUTF();
surname[i] = input.readUTF();
home[i] = input.readUTF();
work[i] = input.readUTF();
cell[i] = input.readUTF();
catch(IOException io)
Document doc = displayPane.getDocument();
try
{ // start of tryblock
// clear previous text
doc.remove(0,doc.getLength());
// insert titles of columns
doc.insertString(0,"NAME\tSURNAME\tHOME NO\tWORK NO\tCELL NO\n",displayPane.getStyle("bold"));
// insert data
for(int i=0; i<name.length; i++)
doc.insertString(doc.getLength(), name[i] +"\t",displayPane.getStyle("regular"));
doc.insertString(doc.getLength(), surname[i] +"\t",displayPane.getStyle("regular"));
doc.insertString(doc.getLength(), home[i]+"\t",displayPane.getStyle("regular"));
doc.insertString(doc.getLength(), work[i]+"\t",displayPane.getStyle("regular"));
doc.insertString(doc.getLength(), cell[i]+"\t",displayPane.getStyle("regular"));
} // end of try block
catch(BadLocationException ble)
{ // start of ble exception handler
System.err.println("Could not insert text.");
} // end of ble exception handler
return displayPane;
} // end of addTextToTextPane()
// code to process user clicks
public void actionPerformed(ActionEvent e)
{ // start of actionPerformed()
String arg = e.getActionCommand();
// user clicks exit option
if(arg.equals("Exit"))
int answer = JOptionPane.showConfirmDialog(null,"Exiting will save all changes to file. \nAre you sure you would like to save and exit now?","File submission",JOptionPane.YES_NO_OPTION);
if(answer == JOptionPane.YES_OPTION)
save();
System.exit(1);
// user clicks help option
if(arg.equals("Help"))
JOptionPane.showMessageDialog(null, "Welcome to the phone book application. To add a new entry press the \"Create\" button.\n To search for an entry press the \"Search\" button.\n To modify an existing entry press the \"Modify\" button. \n To delete an entry press the \"Delete\" button.","Help Topic",JOptionPane.INFORMATION_MESSAGE);
// user clicks about option
if(arg.equals("About"))
JOptionPane.showMessageDialog(null,"Phonebook v 1.01 created by Yucca Nel.\nNo copyright exists.\nThis program is freeware and should not be sold.\nEnjoy :-)","About phonebook",JOptionPane.INFORMATION_MESSAGE);
// user clicks create button
if(arg.equals("Create"))
createNew();
// user clicks search button
if(arg.equals("Search"))
searchForName(arg, name); // Only possible to search by name as all contacts Must have a name
if(arg.equals("Modify"))
modifyContact(arg,name);
save();
// user clicks the sort by name option
if(arg.equals("Name"))
sort(name);
if(arg.equals("Surname"))
sort(surname);
} // end of actionPerformed()
// Method to ceate a new entry
public void createNew()
{ // start of createNew()
int newHome, newWork, newCell = 0;
String newContactName = JOptionPane.showInputDialog(null,"Please enter the new contacts first name or press cancel to exit.");
if(newContactName == null) finish(); // if user clicks cancel
if(newContactName.length() <=0)
JOptionPane.showMessageDialog(null,"You did not enter a valid name.\nPlease make sure you enter data correctly.","Error",JOptionPane.ERROR_MESSAGE);
createNew(); // To return to the create method
String newContactSurname = JOptionPane.showInputDialog(null,"Please enter the new contacts surname or press cancel to exit.");
if(newContactSurname == null) finish(); // if user clicks cancel
if(newContactSurname.equals(""))
int answer = JOptionPane.showConfirmDialog(null,"You did not enter a surname.\nAre you sure you wish to leave the surname empty?","No data entered",JOptionPane.YES_NO_OPTION); // Asks if data was valid
if(answer == JOptionPane.NO_OPTION)
newContactSurname = JOptionPane.showInputDialog(null,"Please enter the new contacts surname.");
String newContactWorkNum = JOptionPane.showInputDialog(null,"Please enter the new contacts work number or press cancel to exit.");
if(newContactWorkNum == null) finish(); // if user clicks cancel
String newContactHomeNum = JOptionPane.showInputDialog(null,"Please enter the new contacts home number or press cancel to exit.");
if(newContactHomeNum == null) finish(); // if user clicks cancel
String newContactCellNum = JOptionPane.showInputDialog(null,"Please enter the new contacts cell number or press cancel to exit.");
if(newContactCellNum == null) finish(); // if user clicks cancel
// enlarge the arrays so they can accept data
name = enlargeArray(name);
surname = enlargeArray(surname);
work = enlargeArray(work);
home = enlargeArray(home);
cell = enlargeArray(cell);
// add the new data into the arrays
name[name.length-1] = newContactName;
surname[surname.length-1] = newContactSurname;
home[home.length-1] = newContactHomeNum;
work[work.length-1] = newContactWorkNum;
cell[cell.length-1] = newContactCellNum;
// sort the names so they appear in alphebetical order
sort(name);
} // end of createNew()
// The enlarge array method
//method to enlarge an array by 1
public String[] enlargeArray(String[] currentArray)
String[] newArray = new String[currentArray.length + 1];
for (int i = 0; i < currentArray.length; i++)
newArray[i] = currentArray;
return newArray;
}// End of enlargeArray()
// The Sort Method
public void sort(String tempArray[])
{ // start of sort()
// for loop
for(int pass = 1; pass < tempArray.length; pass++)
for(int element = 0; element < tempArray.length -1; element++)
if(tempArray[element].compareTo(tempArray[element+1])>0)
swap(name, element, element+1);
swap(surname, element, element+1);
swap(home, element, element+1);
swap(work, element, element+1);
swap(cell, element, element+1);
addTextToTextPane();
} // end of sort()
// The swap method
public void swap(String swapArray[], int first, int second)
{ // start of swap()
String hold;
hold = swapArray[first];
swapArray[first] = swapArray[second];
swapArray[second] = hold;
} // end of swap()
// method to search for a name
public void searchForName(String searchField, String searchArray[])
{ // start of searchForName()
try
Document doc = displayPane.getDocument(); // assign text to an object
doc.remove(0,doc.getLength()); // clear the screen
doc.insertString(0,"NAME\tSURNAME\tHOME NO\tWORK NO\tCELL NO\n",displayPane.getStyle("bold"));
String searchValue = JOptionPane.showInputDialog(null,"Please enter the 1st name of the person you would like to see phone numbers for or press cancel to exit.");
boolean found = false;
if(searchValue == null) finish(); // if user clicks cancel
//search the array
for(int i=0; i < name.length; i++)
if(searchValue.compareTo(searchArray[i])==0)
doc.insertString(doc.getLength(), name[i] +"\t",displayPane.getStyle("regular"));
doc.insertString(doc.getLength(), surname[i] +"\t",displayPane.getStyle("regular"));
doc.insertString(doc.getLength(), home[i]+"\t",displayPane.getStyle("regular"));
doc.insertString(doc.getLength(), work[i]+"\t",displayPane.getStyle("regular"));
doc.insertString(doc.getLength(), cell[i]+"\t",displayPane.getStyle("regular"));
found = true;
if(found == false)
JOptionPane.showMessageDialog(null,"No contact with that name found.","No result found",JOptionPane.INFORMATION_MESSAGE);
sort(name);
catch(BadLocationException ble)
System.err.println("Could not insert text.");
} // end of searchForName()
// Method to modify contact
public void modifyContact(String searchField, String searchArray[])
{ // start of modifyContact()
try
Document doc = displayPane.getDocument(); // assign text to an object
doc.remove(0,doc.getLength()); // clear the screen
doc.insertString(0,"NAME\tSURNAME\tHOME NO\tWORK NO\tCELL NO\n",displayPane.getStyle("bold"));
String modifyValue = JOptionPane.showInputDialog(null,"Please enter the 1st name of the person you would like to change details for. Or press cancel to exit");
boolean found = false;
if(modifyValue == null) finish(); // if user clicks cancel
//search the array
for(int i=0; i < name.length; i++)
if(modifyValue.compareTo(searchArray[i])==0)
// To change the name
String oldName = name[i];
String newName = JOptionPane.showInputDialog(null,"Please enter a new name if you would like to change the name for "+name[i]+". Or press cancel to exit");
if(newName == null)
name[i] = oldName; // if user clicks cancel keep old entry
finish();
if(newName.equals("")) // if no data entered then name will stay same
JOptionPane.showMessageDialog(null,"You did not enter a name in the name field.\nOld name will be kept.","Information Message",JOptionPane.INFORMATION_MESSAGE);
name[i] = oldName;
addTextToTextPane();
else
name[i] = newName; // new name is saved into array
addTextToTextPane();
//To change the surname
String oldSurname = surname[i];
String newSurname = JOptionPane.showInputDialog(null,"Please enter a new surname if you would like to change the surname for "+name[i]+". Or press cancel to exit");
if(newSurname == null)
surname[i] = oldSurname; // if user clicks cancel keep old entry
finish();
if((oldSurname.length()>0) && newSurname.length()<=0) // if surname existed but no new surname was entered
int answer = JOptionPane.showConfirmDialog(null,"You are about to remove the surname for "+name[i]+".\nAre you sure you would like to remove the surname for this contact?","Please confirm the following",JOptionPane.YES_NO_OPTION);
if(answer == JOptionPane.YES_OPTION) // user wishes to remove old surname and leave no surname in place
surname[i] = newSurname; // new surname is saved into the array
else // user does not wish to remove surname
surname[i] = oldSurname; // keep the old surname
else // just replace the surname with new one as everything seems fine
surname[i] = newSurname;
//To change the work number of contact
String oldWork = work[i];
String newWork = JOptionPane.showInputDialog(null,"Please enter a new work number if you would like to change the work number for "+name[i]+". Or press cancel to exit");
if(newWork == null)
work[i] = oldWork; // user clicks cancel keep old entry
finish();
if((oldWork.length()>0) && newWork.length()<=0) // if number existed but no new number was entered
int answer = JOptionPane.showConfirmDialog(null,"You are about to remove the work number for "+name[i]+".\nAre you sure you would like to remove the work number for this contact?","Please confirm the following",JOptionPane.YES_NO_OPTION);
if(answer == JOptionPane.YES_OPTION) // user wishes to remove old number and leave no number in place
work[i] = newWork; // new number is saved into the array
else // user does not wish to remove number
work[i] = oldWork; // keep the old number
else // just replace the number with new one as everything seems fine
work[i] = newWork;
//To change the work number of contact
String oldHome = home[i];
String newHome = JOptionPane.showInputDialog(null,"Please enter a new home number if you would like to change the home number for "+name[i]+". Or press cancel to exit");
if(newHome == null)
home[i] = oldHome; // if user clicks cancel keep old value
finish();
if((oldHome.length()>0) && newHome.length()<=0) // if number existed but no new number was entered
int answer = JOptionPane.showConfirmDialog(null,"You are about to remove the home number for "+name[i]+".\nAre you sure you would like to remove the home number for this contact?","Please confirm the following",JOptionPane.YES_NO_OPTION);
if(answer == JOptionPane.YES_OPTION) // user wishes to remove old number and leave no number in place
home[i] = newHome; // new number is saved into the array
else // user does not wish to remove number
home[i] = oldHome; // keep the old number
else // just replace the number with new one as everything seems fine
home[i] = newHome;
//To change the cell number
String oldCell = cell[i];
String newCell = JOptionPane.showInputDialog(null,"Please enter a new cell number if you would like to change the cell number for "+name[i]+". Or press cancel to exit");
if(newCell == null)
cell[i] = oldCell; // if user clicks cancel keep old value
finish();
if((oldCell.length()>0) && newCell.length()<=0) // if number existed but no new number was entered
int answer = JOptionPane.showConfirmDialog(null,"You are about to remove the Cell number for "+name[i]+".\nAre you sure you would like to remove the cell number for this contact?","Please confirm the following",JOptionPane.YES_NO_OPTION);
if(answer == JOptionPane.YES_OPTION) // user wishes to remove old number and leave no number in place
cell[i] = newCell; // new number is saved into the array
else // user does not wish to remove number
cell[i] = oldCell; // keep the old number
else // just replace the number with new one as everything seems fine
cell[i] = newCell;
found = true;
addTextToTextPane();
if(found == false)
JOptionPane.showMessageDialog(null,"No contact with that name found.","No result found",JOptionPane.INFORMATION_MESSAGE);
sort(name);
addTextToTextPane();
catch(BadLocationException ble)
System.err.println("Could not insert text.");
} // end of searchForName()
// finish method for cancel button
public void finish()
JOptionPane.showMessageDialog(null,"This program will now close and automatically save all data entered. You may restart the program to modify any changes.","Information Message",JOptionPane.INFORMATION_MESSAGE);
System.exit(0);
// method to save data to file
public void save()
try
for(int i=0; i < name.length; i++)
output.writeUTF(name[i]);
output.writeUTF(surname[i]);
output.writeUTF(work[i]);
output.writeUTF(home[i]);
output.writeUTF(cell[i]);
JOptionPane.showMessageDialog(null,"Data succesfully saved to file.","Information message",JOptionPane.INFORMATION_MESSAGE);
catch(IOException io)
System.exit(1);
public static void main(String[] args)
{ // start of main()
// Set look and feel of interface
try
{ // start of try block
UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
} // end of try block
catch(Exception e)
{ // start of catch block
JOptionPane.showMessageDialog(null,"There was an error in setting the look and feel of this application","Error",JOptionPane.INFORMATION_MESSAGE);
} // end of catch block
ContactsListInterface cli = new ContactsListInterface();
cli.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);
cli.setJMenuBar(cli.createMenuBar());
cli.setContentPane(cli.createContentPane());
cli.setSize(520,500);
cli.setVisible(true);
cli.setResizable(false);
} // end of main()
} //end of classBefore thinking I am lazy I dont want you to correct my code. Just give me a few pointers on how to get my arrays back from the file and how to set my strings to a non null value that wont show when my program starts.
Edited by: Yucca on Mar 24, 2008 7:24 PMYucca wrote:
It's pretty easy to write objects to file, but it depends on what you want to do with that file. Do you want it to be a human-readable text file? Is it only to be used by your program? The file is to be used by my program to save to and to read from. But I understand now that saving each entry as a string and not writing it to an array may be easier. Do I use the buffered reader instead of InputStreamReader? Oh sorry I forgot to mention that the file I save to will later be used when I convert my application to a database type/SQL tyype aplication.
Edited by: Yucca on Mar 24, 2008 8:06 PMIt sounds to me like object serialization would be the easiest for what you want to do. Read through this:
http://java.sun.com/developer/technicalArticles/Programming/serialization/
And these apis:
http://java.sun.com/j2se/1.5.0/docs/api/java/io/ObjectOutputStream.html
http://java.sun.com/j2se/1.5.0/docs/api/java/io/ObjectInputStream.html -
Help:Can not find the file in jar!
Hello everyone:
I build a project using Netbeans 5.0 and make a jar file with it...
The code in the project as follows will throw an exception described that it can not find the file named datasource-config.xml
String dataFilePath = getClass().getResource(dataFile).getPath();
//System.out.println("filepath:"+dataFilePath);
InputStream input = new FileInputStream(dataFilePath);
when I run the project with the main() function as an entry it works perfectly and output:
filepath:/C:/projects/java_project/search/build/classes/com/cn/wxjt/lucene/config/datasource-config.xml
But when I compressed the project with jar and run it , it will show:
filepath:file:/C:/projects/java_project/search/dist/search.jar!/com/cn/wxjt/lucene/config/datasource-config.xml
there is a (!) between search.jar and /com/cn/wxjt...
I dont know why I generate a ! symbol in the file path... Is it cause the exception->
java.io.FileNotFoundException: file:\C:\projects\java_project\search\dist\search.jar!\com\cn\wxjt\lucene\config\datasource-config.xml
If you have any idea, plz tell me.
Thank you and best wishes to you !
:)If the file you want to read is in your jar file, use
getClass ().getResourceAsStream
(relative_path_file_name)Hope that help,
Jackhey jack i want to open the file as new File
i m using this.getClass().getResource("resource/backend.xml");
the resource is the directory inside the jar file.
when i prints the url it shows:
the jar file is in the WORK directory
URL : jar:file:/home/neeraj/WORK/show.jar!/resource/backend.xml
now when i creates new File using the url.getFile() method the file does not exist.
although the same programs runs well when i uses the InputStream
so plz tell me cant I create a new File from the above method????
thanks in advance
with regards
neeraj -
Retrieve PCD from Portal...Please Help...Urgent
Hi Ritu
i hope you would have fixed your issue by now.
kindly help me ......
i am trying to use the below piece of code to fetch the list of iviews from PCD.
the problem is i dont understand the error
Code in APC:
===========
public class APC_Comp extends AbstractPortalComponent
public void doContent(IPortalComponentRequest request, IPortalComponentResponse response)
try{
Hashtable env = new Hashtable();
env.put(IPcdContext.SECURITY_PRINCIPAL, request.getUser());
env.put(Context.INITIAL_CONTEXT_FACTORY,IPcdContext.PCD_INITIAL_CONTEXT_FACTORY);
// env.put(com.sap.portal.directory.Constants.REQUESTED_ASPECT, PcmConstants.ASPECT_SEMANTICS);
// /******** Since i couldnt find PcmConstants.ASPECT_SEMANTICS jar i used the below code.
env.put(Constants.REQUESTED_ASPECT,"com.sap.portal.pcd.gl.PersistencyAspect");
InitialContext ctx = null;
DirContext dirCtx;
List roleList = null;
ctx = new InitialContext(env);
dirCtx = (DirContext) ctx.lookup("pcd:portal_content/");
PcdSearchControls pcdSearchControls = new PcdSearchControls();
pcdSearchControls.setReturningObjFlag(false);
pcdSearchControls.setSearchScope(
PcdSearchControls.SUBTREE_WITH_UNIT_ROOTS_SCOPE);
dirCtx.addToEnvironment(
Constants.APPLY_ASPECT_TO_CONTEXTS,
Constants.APPLY_ASPECT_TO_CONTEXTS);
NamingEnumeration ne = dirCtx.search("","(com.sap.portal.pcd.gl.ObjectClass=com.sapportals.portal.*iview*)",
pcdSearchControls);
while (ne.hasMoreElements()) {
IPcdSearchResult searchResult =
(IPcdSearchResult) ne.nextElement();
String location = "pcd:portal_content/" + searchResult.getName();
roleList.add(location);
response.write("Object is "+location);
}catch(Exception e )
response.write("Exception Occured due to :" +e.toString());
Error Log :
==========
<< item 1 : >>#1.5 #001125A585A0005F000003BD0002514800045CAD115E54F3#1227798297334#com.sap.portal.prt.runtime#sap.com/irj#com.sap.portal.prt.runtime#ramesht#150270##n/a##e592fa70bc8511dd9fdd001125a585a0#SAPEngine_Application_Thread[impl:3]_19##0#0#Error##Java###07:04_27/11/08_0078_79979950
[EXCEPTION]
{0}#1#java.lang.NoClassDefFoundError: com.sapportals.portal.pcd.gl.PcdSearchControls
at java.lang.J9VMInternals.verifyImpl(Native Method)
at java.lang.J9VMInternals.verify(J9VMInternals.java:66)
at java.lang.J9VMInternals.initialize(J9VMInternals.java:127)try something like this :
if image file:
ImageIcon image = (new ImageIcon(getClass().getResource("yourpackage/mypackage/image.gif")));
if text file:
InputStream is = this.getClass().getResourceAsStream( "yourpackage/mypackage/myfile.xml");
but all in all , getClass will consume a lot computational power(time). If you have to access so many file, it'd better put it outside the jar -
Help! Saving an image to stream and recreating it on client over network
Hi,
I have an application that uses JDK 1.1.8. I am trying to capture the UI screens of this application over network to a client (another Java app running on a PC). The client uses JDK 1.3.0. As AWT image is not serializable, I got code that converts UI screens to int[] and persist to client socket as objectoutputstream.writeObject and read the data on client side using ObjectInputStream.readObject() api. Then I am converting the int[] to an Image. Then saving the image as JPEG file using JPEG encoder codec of JDK 1.3.0.
I found the image in black and white even though the UI screens are in color. I have the code below. I am sure JPEG encoder part is not doing that. I am missing something when recreating an image. Could be colormodel or the way I create an image on the client side. I am testing this code on a Win XP box with both server and client running on the same machine. In real scenario, the UI runs on an embedded system with pSOS with pretty limited flash space. I am giving below my code.
I appreciate any help or pointers.
Thanks
Puri
public static String getImageDataHeader(Image img, String sImageName)
final String HEADER = "{0} {1}x{2} {3}";
String params[] = {sImageName,
String.valueOf(img.getWidth(null)),
String.valueOf(img.getHeight(null)),
System.getProperty("os.name")
return MessageFormat.format(HEADER, params);
public static int[] convertImageToIntArray(Image img)
if (img == null)
return null;
int imgResult[] = null;
try
int nImgWidth = img.getWidth(null);
int nImgHeight = img.getHeight(null);
if (nImgWidth < 0 || nImgHeight < 0)
Trace.traceError("Image is not ready");
return null;
Trace.traceInfo("Image size: " + nImgWidth + "x" + nImgHeight);
imgResult = new int[nImgWidth*nImgHeight];
PixelGrabber grabber = new PixelGrabber(img, 0, 0, nImgWidth, nImgHeight, imgResult, 0, nImgWidth);
grabber.grabPixels();
ColorModel model = grabber.getColorModel();
if (null != model)
Trace.traceInfo("Color model is " + model);
int nRMask, nGMask, nBMask, nAMask;
nRMask = model.getRed(0xFFFFFFFF);
nGMask = model.getRed(0xFFFFFFFF);
nBMask = model.getRed(0xFFFFFFFF);
nAMask = model.getRed(0xFFFFFFFF);
Trace.traceInfo("The Red mask: " + Integer.toHexString(nRMask) + ", Green mask: " +
Integer.toHexString(nGMask) + ", Blue mask: " +
Integer.toHexString(nBMask) + ", Alpha mask: " +
Integer.toHexString(nAMask));
if ((grabber.getStatus() & ImageObserver.ABORT) != 0)
Trace.traceError("Unable to grab pixels from the image");
imgResult = null;
catch(Throwable error)
error.printStackTrace();
return imgResult;
public static Image convertIntArrayToImage(Component comp, int imgData[], int nWidth, int nHeight)
if (imgData == null || imgData.length <= 0 || nWidth <= 0 || nHeight <= 0)
return null;
//ColorModel cm = new DirectColorModel(32, 0xFF0000, 0xFF00, 0xFF, 0xFF000000);
ColorModel cm = ColorModel.getRGBdefault();
MemoryImageSource imgSource = new MemoryImageSource(nWidth, nHeight, cm, imgData, 0, nWidth);
//MemoryImageSource imgSource = new MemoryImageSource(nWidth, nHeight, imgData, 0, nWidth);
Image imgDummy = Toolkit.getDefaultToolkit().createImage(imgSource);
Image imgResult = comp.createImage(nWidth, nHeight);
Graphics gc = imgResult.getGraphics();
if (null != gc)
gc.drawImage(imgDummy, 0, 0, nWidth, nHeight, null);
gc.dispose();
gc = null;
return imgResult;
public static boolean saveImageToStream(OutputStream out, Image img, String sImageName)
boolean bResult = true;
try
ObjectOutputStream objOut = new ObjectOutputStream(out);
int imageData[] = convertImageToIntArray(img);
if (null != imageData)
// Now that our image is ready, write it to server
String sHeader = getImageDataHeader(img, sImageName);
objOut.writeObject(sHeader);
objOut.writeObject(imageData);
imageData = null;
else
bResult = false;
objOut.flush();
catch(IOException error)
error.printStackTrace();
bResult = false;
return bResult;
public static Image readImageFromStream(InputStream in, Component comp, StringBuffer sbImageName)
Image imgResult = null;
try
ObjectInputStream objIn = new ObjectInputStream(in);
Object objData;
objData = objIn.readObject();
String sImageName, sSource;
int nWidth, nHeight;
if (objData instanceof String)
String sData = (String) objData;
int nIndex = sData.indexOf(' ');
sImageName = sData.substring(0, nIndex);
sData = sData.substring(nIndex+1);
nIndex = sData.indexOf('x');
nWidth = Math.atoi(sData.substring(0, nIndex));
sData = sData.substring(nIndex+1);
nIndex = sData.indexOf(' ');
nHeight = Math.atoi(sData.substring(0, nIndex));
sSource = sData.substring(nIndex+1);
Trace.traceInfo("Name: " + sImageName + ", Width: " + nWidth + ", Height: " + nHeight + ", Source: " + sSource);
objData = objIn.readObject();
if (objData instanceof int[])
int imgData[] = (int[]) objData;
imgResult = convertIntArrayToImage(comp, imgData, nWidth, nHeight);
sbImageName.setLength(0);
sbImageName.append(sImageName);
catch(Exception error)
error.printStackTrace();
return imgResult;
}While testing more, I found that the client side is generating color UI screens if I use JDK 1.3 JVM for running the server (i.e the side that generates the img) without changing single line of code. But if I use JDK 1.1.8 JVM for the server, the client side is generating black and white versions (aka gray toned) of UI screens. So I added code to save int array that I got from PixelGrabber to a text file with 8 ints for each line in hex format. Generated these files on server side with JVM 1.1.8 and JVM 1.3. What I found is that the 1.1.8 pixel grabber is setting R,G,B components to same value where as 1.3 version is setting them to different values thus resulting in colored UI screens. I don't know why.
-
Hi there,
I am a Oracle Developer and I would request your help in using ftpClient. I am using following code for ftping files and then deleting them from the ftp server.
import java.io.*;
import oracle.sql.*;
import java.io.IOException;
import sun.net.TransferProtocolClient;
import sun.net.ftp.FtpClient;
import java.util.Enumeration;
import java.util.Vector;
import FullFtpClient;
public class ORIX_ftp
public static int fget
String host, //FTP server ip address or name
NUMBER port, //FTP server ftp port number
String username, //FTP server username
String password, //FTP server password
String transtype, //FTP transfer type "ASCII" or "BINARY"
String remotedir, //Remote or FTP server directory path from where files will be fetched
String localdir, //Local or Oracle server directory path where files will be fetched
String filenames, //File names seperated by on Remote or FTP server to be fetched from the
String deletefile, //Delete file after file transfer from FTP Server to Database Server
String ErrorMessage[]
FullFtpClient FullFtpClient = new FullFtpClient();
int ErrorStatus = 0;
try
FullFtpClient = new FullFtpClient(host, port.intValue()); //Making FTP connection
FullFtpClient.login(username, password); //Logging on to FTP server
if (transtype == "ASCII")
FullFtpClient.ascii(); //Setting FTP transfer to ascii mode
if (transtype == "BINARY")
FullFtpClient.binary(); //Setting FTP transfer to binary mode
//ftpClient.cd(remotedir); //Set remote or FTP server directory
if (null != filenames)
int StartIndex = 0, PosIndex = 0;
String fname;
InputStream is;
int length;
byte[] buffer;
File file_out;
OutputStream os;
while (-1 != (PosIndex = filenames.indexOf("///",StartIndex)))
//For each filename the file will be fetched
fname = filenames.substring(StartIndex,PosIndex);
is = FullFtpClient.get(fname);
length = 1;
buffer = new byte[1024];
file_out = new File(localdir + "\\" + fname);
os = new FileOutputStream (file_out);
while((length = is.read(buffer)) != -1)
os.write(buffer, 0, length);
PosIndex += 3;
StartIndex = PosIndex;
if (deletefile != null)
FullFtpClient.delete (fname); // Remove file from FTP server
// Last, or only, filename;
if (StartIndex < filenames.length())
fname = filenames.substring(StartIndex);
is = FullFtpClient.get(fname);
length = 1;
buffer = new byte[1024];
file_out= new File(localdir + "\\" + fname);
os = new FileOutputStream (file_out);
while((length = is.read(buffer)) != -1)
os.write(buffer, 0, length);
if (deletefile != null)
FullFtpClient.delete (fname); // Remove file from FTP server
if (FullFtpClient != null)
// FullFtpClient.delete (filenames);
FullFtpClient.closeServer(); //Closing the FTP connection
catch (Exception e)
ErrorMessage[0] = e.toString();
ErrorStatus = 1;
return ErrorStatus;
Although I am catching the Exception, I get exceptions such as NullPointerException and Dele command could not delete file because access denied.
What I want is to transfer the file from ftp server and then delete it only after the transfer is complete. Secondly I want to handle any exception whatsoever arises during the execution of this code.
You help will be of gr8 help.
Thanx a lot
AlokThat is because I don't want to pile the files on the ftp server. Actually the file is transferred from ftp server on to the oracle server, then using javamail its sent to the user and after that there is no point keeping that file on the server. So I want to delete it from both the servers. I am able to delete the file from oracle server but I am unable to delete it from ftp server. Your help would be greatly appreciated.
Thanks & regards,
Alok
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