Help with java.util.Random

Problem:
I wanna generate random number in interval <0;1> with two "decimal number precision" (i dont know, how to expres it exactly in English.. So, here is Patern: "*X.XX*" (For ex. it might be numbers like 0.24 , 1.00 , 0.05, 0.54) ).
I have tried to work with java.util.Random class, but i dont understood it at all, because i'm not good in Math-English terms.
So, how can I do it? I offer duke stars for any solve. Thanks.

First of all, read this link to understand why all floating point numbers (float, double) can't be rounded to two places of decimals.
[What Every Computer Scientist Should Know About Floating-Point Arithmetic|http://docs.sun.com/source/806-3568/ncg_goldberg.html]
Consider changing your program to use integer numbers in the range of [0..100] instead. You can generate a random number in this range byRandom random = new Random();
int randomInt = random.nextInt(101);If your problem can't be solved with this approach, you may need to tell us exactly how you plan to further process the random number.
luck, db

Similar Messages

Help with java.util.logging SocketHandler - Simple TCP Server

I have a simple TCP serverString clientSentence;
             ServerSocket welcomeSocket = new ServerSocket(5050);
             while(true) {
                Socket connectionSocket = welcomeSocket.accept();
                BufferedReader inFromClient = new BufferedReader(new InputStreamReader(connectionSocket.getInputStream()));
                while ((clientSentence = inFromClient.readLine()) != null) {
                     System.out.println("Received: " + clientSentence);
             }And I have a java.util.logging logger using a SocketHandler. I'm just calling logger.log("my message"); I get the expected result to System.out: "my message". But when I go on to call again logger.log("my next message") I get both messages in queue: "my message" and "my next message" on the next line. So, I get from these two calls to logger.log() the following result in System.out
my message
my message
my next message...whereas I expected
my message
my next messageWhy is "my message" being saved even after being passed through the TCP connection to the server? I tried handler.flush() but that doesn't help. Pretty sure the problem isn't at the server end because when I create two loggers with their own SocketHandlers the server doesn't double up on their messages. (In other words, if I let one logger say simply "my message" and the second logger say "my next message" I get the expected output. It's like each logger needs to be flushed after sending to the server.
Any advice appreciated.

Yes, I was just rereading your post and it's apparent that you were suspecting the client code. Your posting only the server led me to believe that you were focusing on that and I kind of skipped over the last part.
So to answer your question, yes, the server code looks okay. And you were suspecting the client anyway, so problem solved.

Help with java mapping

PI File adapter has a processing option u2018Empty-Message Handlingu2019 to ignore or Write Empty Files. In case there is no data created after mapping on target side then this option determines whether to write an empty file or not. But there is a catch to this option when it comes to using it with File Content Conversion which is described in SAP Note u2018821267u2019. It states following:
I configure the receiver channel with File content conversion mode and I set the 'Empty Message Handling' option to ignore. Input payload to the receiver channel is generated out of mapping and it does not have any record sets. However, this payload has a root element. Why does file receiver create empty output file with zero byte size in the target directory? Example of such a payload generated from mapping is as follows:
<?xml version="1.0" encoding="UTF-8"?>
<ns1:test xmlns:ns1="http://abcd.com/ab"></ns1:test>
solution :
If the message payload is empty (i.e., zero bytes in size), then File adapter's empty message handling feature does NOT write files into the target directory. On the other hand, if the payload is a valid XML document (as shown in example) that is generated from mapping with just a root element in it, the File Adapter does not treat it as an empty message and accordingly it writes to the target directory. To achieve your objective of not writing files (that have just a single root element) into the target directory, following could be done:
Using a Java or ABAP Mapping in order to restrict the creation of node itself during mapping. (This cannot be achieved via Message Mapping)
Using standard adapter modules to do content conversion first and then write file.
can someone help with java mapping that can be used in this case?

Hi,
    You have not mentioned the version of PI you are working in. In case you are working with PI 7.1 or above then here is the java mapping code you need to add after message mapping in the same interface mapping
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Map;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import org.w3c.dom.Document;
import com.sap.aii.mapping.api.AbstractTransformation;
import com.sap.aii.mapping.api.StreamTransformationException;
import com.sap.aii.mapping.api.TransformationInput;
import com.sap.aii.mapping.api.TransformationOutput;
public class RemoveRootNode extends AbstractTransformation{
     public void execute(InputStream in, OutputStream out)
     throws StreamTransformationException {
// TODO Auto-generated method stub
try
     DocumentBuilderFactory factory=DocumentBuilderFactory.newInstance();
     DocumentBuilder builderel=factory.newDocumentBuilder();
     /*input document in form of XML*/
     Document docIn=builderel.parse(in);
     /*document after parsing*/
     Document docOut=builderel.newDocument();
     TransformerFactory tf=TransformerFactory.newInstance();
     Transformer transform=tf.newTransformer();
     if(docIn.getDocumentElement().hasChildNodes())
          docOut.appendChild(docOut.importNode(docIn.getDocumentElement(),true));
          transform.transform(new DOMSource(docOut), new StreamResult(out));
     else
          out.write(null);
catch(Exception e)
public void setParameter(Map arg0) {
// TODO Auto-generated method stub
public static void main(String[] args) {
// TODO Auto-generated method stub
try{
     RemoveRootNode genFormat=new RemoveRootNode();
     FileInputStream in=new FileInputStream("C:\\apps\\sdn\\rootNode.xml");
     FileOutputStream out=new FileOutputStream("C:\\apps\\sdn\\rootNode1.xml");
     genFormat.execute(in,out);
     catch(Exception e)
     e.printStackTrace();
public void transform(TransformationInput arg0, TransformationOutput arg1)
          throws StreamTransformationException {
     // TODO Auto-generated method stub
     this.execute(arg0.getInputPayload().getInputStream(), arg1.getOutputPayload().getOutputStream());
In case you are working in PI 7.0 you can use this code
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Map;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import org.w3c.dom.Document;
import com.sap.aii.mapping.api.StreamTransformation;
import com.sap.aii.mapping.api.StreamTransformationException;
public class RemoveRootNode implements StreamTransformation{
     public void execute(InputStream in, OutputStream out)
     throws StreamTransformationException {
// TODO Auto-generated method stub
try
     DocumentBuilderFactory factory=DocumentBuilderFactory.newInstance();
     DocumentBuilder builderel=factory.newDocumentBuilder();
     /*input document in form of XML*/
     Document docIn=builderel.parse(in);
     /*document after parsing*/
     Document docOut=builderel.newDocument();
     TransformerFactory tf=TransformerFactory.newInstance();
     Transformer transform=tf.newTransformer();
     if(docIn.getDocumentElement().hasChildNodes())
          docOut.appendChild(docOut.importNode(docIn.getDocumentElement(),true));
          transform.transform(new DOMSource(docOut), new StreamResult(out));
     else
          out.write(null);
catch(Exception e)
public void setParameter(Map arg0) {
// TODO Auto-generated method stub
public static void main(String[] args) {
// TODO Auto-generated method stub
try{
     RemoveRootNode genFormat=new RemoveRootNode();
     FileInputStream in=new FileInputStream("C:\\apps\\sdn\\rootNode.xml");
     FileOutputStream out=new FileOutputStream("C:\\apps\\sdn\\rootNode1.xml");
     genFormat.execute(in,out);
     catch(Exception e)
     e.printStackTrace();
The code for PI 7.0 should also work for PI 7.1 provided you use the right jar files for compilation, but vice-versa is not true.
Could you please let us know if this code was useful to you or not?
Regards
Anupam
Edited by: anupamsap on Dec 15, 2011 9:43 AM

Can't create log file with java.util.logging

Hi,
I have created a class to create a log file with java.util.logging
This class works correctly as standalone (without jdev/weblogic)
import java.io.IOException;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.logging.*;
public class LogDemo
     private static final Logger logger = Logger.getLogger( "Logging" );
     public static void main( String[] args ) throws IOException
         Date date = new Date();
         DateFormat dateFormat = new SimpleDateFormat("yyyyMMdd");
         String dateStr = dateFormat.format(date);
         String logFileName = dateStr + "SEC" + ".log";
         Handler fh;
         try
           fh = new FileHandler(logFileName);
           //fh.setFormatter(new XMLFormatter());
           fh.setFormatter(new SimpleFormatter());
           logger.addHandler(fh);
           logger.setLevel(Level.ALL);
           logger.log(Level.INFO, "Initialization log");
           // force a bug
           ((Object)null).toString();
         catch (IOException e)
              logger.log( Level.WARNING, e.getMessage(), e );
         catch (Exception e)
              logger.log( Level.WARNING, "Exception", e);
}But when I use this class...
import java.io.File;
import java.io.IOException;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.logging.FileHandler;
import java.util.logging.Handler;
import java.util.logging.Level;
import java.util.logging.Logger;
import java.util.logging.XMLFormatter;
public class TraceUtils
public static Logger logger = Logger.getLogger("log");
public static void initLogger(String ApplicationName) {
    Date date = new Date();
    DateFormat dateFormat = new SimpleDateFormat("yyyyMMdd");
    String dateStr = dateFormat.format(date);
    String logFileName = dateStr + ApplicationName + ".log";
    Handler fh;
    try
      fh = new FileHandler(logFileName);
      fh.setFormatter(new XMLFormatter());
      logger.addHandler(fh);
      logger.setLevel(Level.ALL);
      logger.log(Level.INFO, "Initialization log");
    catch (IOException e)
      System.out.println(e.getMessage());
}and I call it in a backingBean, I have the message in console but the log file is not created.
TraceUtils.initLogger("SEC");why?
Thanks for your help.

I have uncommented this line in logging.properties and it works.
# To also add the FileHandler, use the following line instead.
handlers= java.util.logging.FileHandler, java.util.logging.ConsoleHandlerBut I have another problem:
jdev ignore the parameters of the FileHandler method .
And it creates a general log file with anothers log files created each time I call the method logp.
So I play with these parameters
fh = new FileHandler(logFileName,true);
fh = new FileHandler(logFileName,0,1,true);
fh = new FileHandler(logFileName,10000000,1,true);without succes.
I want only one log file, how to do that?

How do I compress a string with java.util.zip - not a file ?

How do I compress a string with java.util.zip?
Is possible to compress something else except a file?

Of course, compression works on bytes, not some higher level constructs like Strings or files.
You can use the ZipOutputStream or DeflaterOutputStream for compression.
And the javadoc for Deflater even has a code example of compressing a String.
Edited by: Kayaman on May 22, 2011 5:04 PM

Need help with printing a random number.

So far I have...
* @(#)SlotMachine.java
* SlotMachine application
* Dylan Bailey
* @version 1.00 2008/11/19
// import scanners and random
import java.util.Scanner;
import java.util.Random;
public class SlotMachine {
    public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    String again = "n";
    int randomNum1, randomNum2, randomNum3;
    System.out.println("Slots Game!");
    Random gen = new Random();
    randomNum1 = gen.nextInt(10);
    randomNum2 = gen.nextInt(10);
    randomNum3 = gen.nextInt(10);
    System.out.println("Slot rolled: " + randomNum1 + randomNum1 + randomNum1 );
}hah just kidding i fixed it.
But now what i need to do is an do while statement. I need to compare if 2 or 3 of the numbers are the same.
How do I go about this?
if what?
Edited by: Dylan.Bailey on Nov 19, 2008 10:31 AM

Wait lol that was just my example....
So far i have got....
     if(randomNum1 == randomNum2 && randomNum1 == randomNum3)
        System.out.println("JACKPOT! Congradulations!");
     else{
          if((randomNum1 == randomNum2 && randomNum1 == randomNum3))
     But this is not working :(

Hi I have a geometry problem.Can anyone help with java code

Hi I have a non simple polygon . My job is to make it a simple. for that First I need to find the intersecting lines say line AB intersects line CD. If so then I must replace AB & CD with AC & BD or AD or BC which ever keeps the polygon closed . So can anyone help me out with this code
import java.io.*;
import java.awt.*;
import java.awt.geom.*;
import java.awt.image.*;
import javax.swing.*;
public class Simple{
static int POINTWID = 4; // size of points
// the x and y arrays hold the coordinates
// the B array is the order of the points in the polygon
// You want to fill the C array with the simple polygon
static double x[] = new double[200];
static double y[] = new double[200];
static int B[] = new int[200]; // the permutation matrix
static int C[] = new int[200]; // the one that becomes simple
static SimpleFrame myFrame;
static int numPoints = 3;
public static void main(String args[]) {
makePolygons();
// Create the frame to draw on
myFrame = new SimpleFrame();
myFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
myFrame.setSize(600, 600);
myFrame.setVisible(true);
public static void makePolygons(){
// Build an array of random points in the unit square
for(int i = 0; i < numPoints; i++){
x[i] = Math.random();
y[i] = Math.random();// Sample program
B[i] = i; // default permutation
// Create the simple polygon
createSimplePolygon();
* This is the only function you need to mess with
public static void createSimplePolygon(){
// Initialize the C[] array with the identity permutation
for(int i = 0; i < numPoints; i++)
C[i] = i;
// Bubble sort the points from left to right
for(int i = 0; i < numPoints; i++)
for(int j = 0; j < numPoints - 1; j++)
if(x[C[j]] > x[C[j+1]]){
int temp = C[j];
C[j] = C[j+1];
C[j+1] = temp;
public static class SimpleFrame extends JFrame{
public static JSlider numPointsSlider;
public SimpleFrame()
super("Create you own Simple Polygon");
Container content = getContentPane();
content.setLayout(new java.awt.BorderLayout());
JTabbedPane tabbedPane = new JTabbedPane();
tabbedPane.setPreferredSize (new java.awt.Dimension(300, 400));
tabbedPane.addTab("Scrambled", new ScrambledPanel());
tabbedPane.addTab("Simple", new SimplePanel());
content.add(tabbedPane, java.awt.BorderLayout.CENTER);
// Slider for the number of points
numPointsSlider = new JSlider (javax.swing.SwingConstants.HORIZONTAL,
3, 100, 11);
numPointsSlider.addChangeListener (new javax.swing.event.ChangeListener () {
public void stateChanged (javax.swing.event.ChangeEvent evt) {
numPointsSliderStateChanged (evt);
content.add(numPointsSlider, java.awt.BorderLayout.SOUTH);
private void numPointsSliderStateChanged (javax.swing.event.ChangeEvent evt) {
numPoints = numPointsSlider.getValue();
makePolygons();
repaint();
public static class ScrambledPanel extends JPanel{
public void paintComponent(Graphics g){
super.paintComponent(g);
Graphics2D g2 = (Graphics2D) g;
// First set the scaling to fit the window
Dimension size = getSize();
int Xwid = (int) (0.95 * size.width);
int Ywid = (int) (0.95 * size.height);
// First draw the segments
g2.setColor(Color.red);
for(int i = 0; i < numPoints; i++)
g2.drawLine((int) (Xwid * x[B[i]]),
(int) (Ywid * y[B[i]]),
(int) (Xwid * x[B[(i+1) % numPoints]]),
(int)(Ywid * y[B[(i+1) % numPoints]]));
// Now draw the points
for(int i = 0; i < numPoints; i++){
g2.fillRect((int) (Xwid * x) - POINTWID,
(int) (Ywid * y[i]) - POINTWID,
2*POINTWID + 1, 2*POINTWID + 1);
public static class SimplePanel extends JPanel{
public void paintComponent(Graphics g){
super.paintComponent(g);
Graphics2D g2 = (Graphics2D) g;
// First set the scaling to fit the window
Dimension size = getSize();
int Xwid = (int) (0.95 * size.width);
int Ywid = (int) (0.95 * size.height);
// First draw the segments
g2.setColor(Color.red);
for(int i = 0; i < numPoints; i++)
g2.drawLine((int) (Xwid * x[C[i]]),
(int) (Ywid * y[C[i]]),
(int) (Xwid * x[C[(i+1) % numPoints]]),
(int)(Ywid * y[C[(i+1) % numPoints]]));
// Now draw the points
for(int i = 0; i < numPoints; i++){
g2.fillRect((int) (Xwid * x[i]) - POINTWID,
(int) (Ywid * y[i]) - POINTWID,
2*POINTWID + 1, 2*POINTWID + 1);

Hi I am sorry I could explain you properly . Ok
My program gives me a polygon(as you can see when u
run this program)But the polygon is a non simple
polygon.So to make this polygon we must remove all
the crossings betweeen edges in the polygon.The
algorithm which i gave will remove all the crossings
and make the polygon simple.You did not give an algorithm!
SO my job is to take the
existing code and implement the algorithm for this
program in the Createsimpelpolygon() function. For
this First the program must find whether two edges
cross if they cross then swap the vertices like
replace AB & CD with AC & BD or AD & BC.Which ever
keeps the polygon closed . Still not entirely clear to me. You cannot just go and replace vertexes from a polygon: that way you'll end up with a different polygon.
So as we go on we find the
many crossings and iterate the algorithm on all the
crossings until we get simple polygon.Like I said: I don't really understand what it is you're after. You did not respond to my suggestions, so I gather it is not what you're after?
What about Polygon Tessellation (Google for it)? Perhaps that's what you want.
Also, why do you not create a (or use java.awt's) Point class and a Polygon class which holds a java.util.Set of Point's? Your current code looks rather messy.

Help with Java script

So , I edited the ITunes.java as described in the Admin guide.Copied the .class to my cgi folder in the server.I copied the itunesu file from the shell folder of the sample code.I have modified it accordingly.But when I run it in browser(Firefox) as ..../cgi-bin/itunesu it just gives me a blank page.Nothing shows up.I ran the ITunes.java file locally and it generates an HTML output, which I copied and created a new html.After I run this HTML file, it opens my itunes, but again it says page not found and url contains https://www.xxx.edu/cgi-bin/itunesu?destination=xxx.edu where xxx is my institution name.Not sure if I am supposed to display my institution name in forum.
The admin guide says on page 15 step 4.Copy the itunes.class file and other itunes file to your web server's cgi-bin directory.
I am not quiet sure what does other itunes file mean??
This is how my .java file looks.
import java.io.*;
import java.net.*;
import java.security.*;
import java.util.*;
* The <CODE>ITunesU</CODE> class permits the secure transmission
* of user credentials and identity between an institution's
* authentication and authorization system and iTunes U.
* The code in this class can be tested by
* running it with the following commands:
* <PRE>
* javac ITunesU.java
* java ITunesU</PRE>
* Changes to values defined in this class' main() method must
* be made before it will succesfully communicate with iTunes U.
public class ITunesU extends Object {
* Generate the HMAC-SHA256 signature of a message string, as defined in
* RFC 2104.
* @param message The string to sign.
* @param key The bytes of the key to sign it with.
* @return A hexadecimal representation of the signature.
public String hmacSHA256(String message, byte[] key) {
// Start by getting an object to generate SHA-256 hashes with.
MessageDigest sha256 = null;
try {
sha256 = MessageDigest.getInstance("SHA-256");
} catch (NoSuchAlgorithmException e) {
throw new java.lang.AssertionError(
this.getClass().getName()
+ ".hmacSHA256(): SHA-256 algorithm not found!");
// Hash the key if necessary to make it fit in a block (see RFC 2104).
if (key.length > 64) {
sha256.update(key);
key = sha256.digest();
sha256.reset();
// Pad the key bytes to a block (see RFC 2104).
byte block[] = new byte[64];
for (int i = 0; i < key.length; ++i) block = key;
for (int i = key.length; i < block.length; ++i) block = 0;
// Calculate the inner hash, defined in RFC 2104 as
// SHA-256(KEY ^ IPAD + MESSAGE)), where IPAD is 64 bytes of 0x36.
for (int i = 0; i < 64; ++i) block ^= 0x36;
sha256.update(block);
try {
sha256.update(message.getBytes("UTF-8"));
} catch (UnsupportedEncodingException e) {
throw new java.lang.AssertionError(
"ITunesU.hmacSH256(): UTF-8 encoding not supported!");
byte[] hash = sha256.digest();
sha256.reset();
// Calculate the outer hash, defined in RFC 2104 as
// SHA-256(KEY ^ OPAD + INNER_HASH), where OPAD is 64 bytes of 0x5c.
for (int i = 0; i < 64; ++i) block ^= (0x36 ^ 0x5c);
sha256.update(block);
sha256.update(hash);
hash = sha256.digest();
// The outer hash is the message signature...
// convert its bytes to hexadecimals.
char[] hexadecimals = new char[hash.length * 2];
for (int i = 0; i < hash.length; ++i) {
for (int j = 0; j < 2; ++j) {
int value = (hash >> (4 - 4 * j)) & 0xf;
char base = (value < 10) ? ('0') : ('a' - 10);
hexadecimals[i * 2 + j] = (char)(base + value);
// Return a hexadecimal string representation of the message signature.
return new String(hexadecimals);
* Combine user credentials into an appropriately formatted string.
* @param credentials An array of credential strings. Credential
* strings may contain any character but ';'
* (semicolon), '\\' (backslash), and control
* characters (with ASCII codes 0-31 and 127).
* @return <CODE>null</CODE> if and only if any of the credential strings
* are invalid.
public String getCredentialsString(String[] credentials) {
// Create a buffer with which to generate the credentials string.
StringBuffer buffer = new StringBuffer();
// Verify and add each credential to the buffer.
if (credentials != null) {
for (int i = 0; i < credentials.length; ++i) {
if (i > 0) buffer.append(';');
for (int j = 0, n = credentials.length(); j < n; ++j) {
char c = credentials.charAt(j);
if (c != ';' && c != '\\' && c >= ' ' && c != 127) {
buffer.append(c);
} else {
return null;
// Return the credentials string.
return buffer.toString();
* Combine user identity information into an appropriately formatted string.
* @param displayName The user's name (optional).
* @param emailAddress The user's email address (optional).
* @param username The user's username (optional).
* @param userIdentifier A unique identifier for the user (optional).
* @return A non-<CODE>null</CODE> user identity string.
public String getIdentityString(String displayName, String emailAddress,
String username, String userIdentifier) {
// Create a buffer with which to generate the identity string.
StringBuffer buffer = new StringBuffer();
// Define the values and delimiters of each of the string's elements.
String[] values = { displayName, emailAddress,
username, userIdentifier };
char[][] delimiters = { { '"', '"' }, { '<'(', ')' }, { '[', ']' } };
// Add each element to the buffer, escaping
// and delimiting them appropriately.
for (int i = 0; i < values.length; ++i) {
if (values != null) {
if (buffer.length() > 0) buffer.append(' ');
buffer.append(delimiters[0]);
for (int j = 0, n = values.length(); j < n; ++j) {
char c = values.charAt(j);
if (c == delimiters[1] || c == '\\') buffer.append('\\');
buffer.append(c);
buffer.append(delimiters[1]);
// Return the generated string.
return buffer.toString();
* Generate an iTunes U digital signature for a user's credentials
* and identity. Signatures are usually sent to iTunes U along
* with the credentials, identity, and a time stamp to warrant
* to iTunes U that the credential and identity values are
* officially sanctioned. For such uses, it will usually makes
* more sense to use an authorization token obtained from the
* {@link #getAuthorizationToken(java.lang.String, java.lang.String, java.util.Date, byte[])}
* method than to use a signature directly: Authorization
* tokens include the signature but also the credentials, identity,
* and time stamp, and have those conveniently packaged in
* a format that is easy to send to iTunes U over HTTPS.
* @param credentials The user's credentials string, as
* obtained from getCredentialsString().
* @param identity The user's identity string, as
* obtained from getIdentityString().
* @param time Signature time stamp.
* @param key The bytes of your institution's iTunes U shared secret key.
* @return A hexadecimal representation of the signature.
public String getSignature(String credentials, String identity,
Date time, byte[] key) {
// Create a buffer in which to format the data to sign.
StringBuffer buffer = new StringBuffer();
// Generate the data to sign.
try {
// Start with the appropriately encoded credentials.
buffer.append("credentials=");
buffer.append(URLEncoder.encode(credentials, "UTF-8"));
// Add the appropriately encoded identity information.
buffer.append("&identity=");
buffer.append(URLEncoder.encode(identity, "UTF-8"));
// Add the appropriately formatted time stamp. Note that
// the time stamp is expressed in seconds, not milliseconds.
buffer.append("&time=");
buffer.append(time.getTime() / 1000);
} catch (UnsupportedEncodingException e) {
// UTF-8 encoding support is required.
throw new java.lang.AssertionError(
"ITunesU.getSignature(): UTF-8 encoding not supported!");
// Generate and return the signature.
String signature = this.hmacSHA256(buffer.toString(), key);
return signature;
* Generate and sign an authorization token that you can use to securely
* communicate to iTunes U a user's credentials and identity. The token
* includes all the data you need to communicate to iTunes U as well as
* a creation time stamp and a digital signature for the data and time.
* @param credentials The user's credentials string, as
* obtained from getCredentialsString().
* @param identity The user's identity string, as
* obtained from getIdentityString().
* @param time Token time stamp. The token will only be valid from
* its time stamp time and for a short time thereafter
* (usually 90 seconds).
* @param key The bytes of your institution's iTunes U shared secret key.
* @return The authorization token. The returned token will
* be URL-encoded and can be sent to iTunes U with
* a form
* submission. iTunes U will typically respond with
* HTML that should be sent to the user's browser.
public String getAuthorizationToken(String credentials, String identity,
Date time, byte[] key) {
// Create a buffer with which to generate the authorization token.
StringBuffer buffer = new StringBuffer();
// Generate the authorization token.
try {
// Start with the appropriately encoded credentials.
buffer.append("credentials=");
buffer.append(URLEncoder.encode(credentials, "UTF-8"));
// Add the appropriately encoded identity information.
buffer.append("&identity=");
buffer.append(URLEncoder.encode(identity, "UTF-8"));
// Add the appropriately formatted time stamp. Note that
// the time stamp is expressed in seconds, not milliseconds.
buffer.append("&time=");
buffer.append(time.getTime() / 1000);
// Generate and add the token signature.
String data = buffer.toString();
buffer.append("&signature=");
buffer.append(this.hmacSHA256(data, key));
} catch (UnsupportedEncodingException e) {
// UTF-8 encoding support is required.
throw new java.lang.AssertionError(
"ITunesU.getAuthorizationToken(): "
+ "UTF-8 encoding not supported!");
// Return the signed authorization token.
return buffer.toString();
* Send a request for an action to iTunes U with an authorization token.
* @param url URL defining how to communicate with iTunes U and
* identifying which iTunes U action to invoke and which iTunes
* U page or item to apply the action to. Such URLs have a
* format like <CODE>[PREFIX]/[ACTION]/[DESTINATION]</CODE>,
* where <CODE>[PREFIX]</CODE> is a value like
* "https://deimos.apple.com/WebObjects/Core.woa" which defines
* how to communicate with iTunes U, <CODE>[ACTION]</CODE>
* is a value like "Browse" which identifies which iTunes U
* action to invoke, and <CODE>[DESTINATION]</CODE> is a value
* like "example.edu" which identifies which iTunes U page
* or item to apply the action to. The destination string
* "example.edu" refers to the root page of the iTunes U site
* identified by the domain "example.edu". Destination strings
* for other items within that site contain the site domain
* followed by numbers separated by periods. For example:
* "example.edu.123.456.0789". You can find these
* strings in the items' URLs, which you can obtain from
* iTunes. See the iTunes U documentation for details.
* @param token Authorization token generated by getAuthorizationToken().
* @return The iTunes U response, which may be HTML or
* text depending on the type of action invoked.
public String invokeAction(String url, String token) {
// Send a request to iTunes U and record the response.
StringBuffer response = null;
try {
// Verify that the communication will be over SSL.
if (!url.startsWith("https")) {
throw new MalformedURLException(
"ITunesU.invokeAction(): URL \""
+ url + "\" does not use HTTPS.");
// Create a connection to the requested iTunes U URL.
HttpURLConnection connection =
(HttpURLConnection)new URL(url).openConnection();
connection.setUseCaches(false);
connection.setDoOutput(true);
connection.setRequestMethod("POST");
connection.setRequestProperty(
"Content-Type",
"application/x-www-form-urlencoded; charset=UTF-8");
// Send the authorization token to iTunes U.
connection.connect();
OutputStream output = connection.getOutputStream();
output.write(token.getBytes("UTF-8"));
output.flush();
output.close();
// Read iTunes U's response.
response = new StringBuffer();
InputStream input = connection.getInputStream();
Reader reader = new InputStreamReader(input, "UTF-8");
reader = new BufferedReader(reader);
char[] buffer = new char[16 * 1024];
for (int n = 0; n >= 0;) {
n = reader.read(buffer, 0, buffer.length);
if (n > 0) response.append(buffer, 0, n);
// Clean up.
input.close();
connection.disconnect();
} catch (UnsupportedEncodingException e) {
// ITunes U requires UTF-8 and ASCII encoding support.
throw new java.lang.AssertionError(
"ITunesU.invokeAction(): UTF-8 encoding not supported!");
} catch (IOException e) {
// Report communication problems.
throw new java.lang.AssertionError(
"ITunesU.invokeAction(): I/O Exception " + e);
// Return the response received from iTunes U.
return response.toString();
* iTunes U credential and identity transmission sample. When your
* itunes U site is initially created, Apple will send your institution's
* technical contact a welcome email with a link to an iTunes U page
* containing the following information, which you will need to customize
* this method's code for your site:
<DD><DL><DT>
* Information:<DD><CODE>
* Site URL</CODE> - The URL to your site in iTunes U. The last
* component of that URL, after the last slash,
* is a domain name that uniquely identifies your
* site within iTunes U.<DD><CODE>
* shared secret</CODE> - A secret key known only to you and Apple that
* allows you to control who has access to your
* site and what access they have to it.<DD><CODE>
* debug suffix</CODE> - A suffix you can append to your site URL
* to obtain debugging information about the
* transmission of credentials and identity
* information from your institution's
* authentication and authorization services
* to iTunes U.<DD><CODE>
* administrator credential</CODE> - The credential string to assign
* to users who should have the
* permission to administer your
* iTunes U site.</DL></DD>
<DD>
* Once you have substitute the information above in this method's code
* as indicated in the code's comments, this method will connect
* to iTunes U and obtain from it the HTML that needs to be returned to a
* user's web browser to have a particular page or item in your iTunes U
* site displayed to that user in iTunes. You can modify this method to
* instead output the URL that would need to be opened to have that page
* or item displayed in iTunes.</DD>
public static void main(String argv[]) {
// Define your site's information. Replace these
// values with ones appropriate for your site.
String siteURL =
"https://deimos.apple.com/WebObjects/Core.woa/Browse/xxx.edu" ;
String debugSuffix = "/abc123";
String sharedSecret = "some key";
String administratorCredential =
"Administrator@urn:mace:itunesu.com:sites:xxx.edu";
// Define the user information. Replace the credentials with the
// credentials you want to grant to the current user, and the
// optional identity information with the identity of that user.
// For initial testing and site setup, use the singe administrator
// credential defined when your iTunes U site was created. Once
// you have access to your iTunes U site, you will be able to define
// additional credentials and the iTunes U access they provide.
String[] credentialsArray = { administratorCredential };
String displayName = "my name";
String emailAddress = "my [email protected]";
String username = "mylogin";
String userIdentifier = "1243";
// Define the iTunes U page to browse. Use the domain name that
// uniquely identifies your site in iTunes U to browse to that site's
// root page; use a destination string extracted from an iTunes U URL
// to browse to another iTunes U page; or use a destination string
// supplied as the "destination" parameter if this program is being
// invoked as a part of the login web service for your iTunes U site.
String siteDomain = siteURL.substring(siteURL.lastIndexOf('/') + 1);
String destination = siteDomain;
// Append your site's debug suffix to the destination if you want
// to receive an HTML page providing information about the
// transmission of credentials and identity between this program
// and iTunes U. Uncomment the following line for testing only.
//destination = destination + debugSuffix;
// Use an ITunesU instance to format the credentials and identity
// strings and to generate an authorization token for them.
ITunesU iTunesU = new ITunesU();
String identity = iTunesU.getIdentityString(displayName, emailAddress,
username, userIdentifier);
String credentials = iTunesU.getCredentialsString(credentialsArray);
Date now = new Date();
byte[] key = null;
try {
key = sharedSecret.getBytes("US-ASCII");
} catch (UnsupportedEncodingException e) {
throw new java.lang.AssertionError(
"ITunesU.hmacSH256(): US-ASCII encoding not supported!");
String token = iTunesU.getAuthorizationToken(credentials, identity,
now, key);
// Use the authorization token to connect to iTunes U and obtain
// from it the HTML that needs to be returned to a user's web
// browser to have a particular page or item in your iTunes U
// site displayed to that user in iTunes. Replace "/Browse/" in
// the code below with "/API/GetBrowseURL/" if you instead want
// to return the URL that would need to be opened to have that
// page or item displayed in iTunes.
String prefix = siteURL.substring(0, siteURL.indexOf(".woa/") + 4);
String url = prefix + "/Browse/" + destination;
String results = iTunesU.invokeAction(url, token);
System.out.println(results);
The itunes file from Shell folder has been modified as follows
DISPLAY_NAME= "myname"
EMAIL_ADDRESS="[email protected]"
USERNAME="mylogin"
USER_IDENTIFIER="1243"
all the other things in that file have been untouched.
I also generated the debug which looks like this
iTunes U Access Debugging
Received
Destination xxx.edu
Identity "my name" <[email protected]> (mylogin) [1243]
Credentials Administrator@urn:mace:itunesu.com:sites:xxx.edu
Time 1196706873
Signature 533870b8jshdidk333lfsf6a3143a55c132ec548a4d545bd79322402e8e2596e4
Analysis
The destination string is valid and the corresponding destination item was found.
The identity string is valid and provides the following information:
Display Name my name
Email Address [email protected]
Username mylogin
User Identifier 1243
The credential string is valid and contains the following recognized credential:
1. Administrator@urn:mace:itunesu.com:sites:xxx.edu
The time string is valid and corresponds to 2007-12-03 18:34:33Z.
The signature string is valid.
Access
Because the received signature and time were valid, the received identity and credentials were accepted by iTunes U.
In addition, the following 2 credentials were automatically added by iTunes U:
1. All@urn:mace:itunesu.com:sites:xxx.edu
2. Authenticated@urn:mace:itunesu.com:sites:xxx.edu
With these credentials, you have browsing, downloading, uploading, and editing access to the requested destination.
I am pretty new to this, and working on this for the first time.If someone could guide me through this would be pretty helpful.

This is only going to work under IE !
Go to your page template :
Modify the definition, make sur you have this :
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>#TITLE#</title>
#HEAD#
<Script language = javascript>
Browser = navigator.appName
Net = Browser.indexOf("Netscape")
Micro = Browser.indexOf("Microsoft")
Netscape = false
IE = false
if(Net >= 0) {Netscape = true}
if(Micro >= 0) {IE = true}
function XYpos() {
if (IE == true) {
xPos = event.screenX
yPos = event.screenY
alert(xPos + " left " + yPos + " down")
else if (Netscape == true) {alert("Script won't work: " + "\n" + "You're using Netscape")}
</script>
Modify the body definition, make sure you have this :
<body #ONLOAD# onMouseDown = XYpos()>
I didnt try it but it make sens to me... tell me if it works!
Flex
Homepage : http://www.insum.ca
InSum Solutions' blog : http://insum-apex.blogspot.com

Please help with Java program

Errors driving me crazy! although compiles fine
I am working on a project for an online class - I am teaching myself really! My last assignment I cannot get to work. I had a friend who "knows" what he is doing help me. Well that didn't work out too well, my class is a beginner and he put stuff in that I never used yet. I am using Jgrasp and Eclipse. I really am trying but, there really is no teacher with this online class. I can't get questions answered in time and stuff goes past due. I am getting this error:
Exception in thread "main" java.lang.NullPointerException
at java.io.Reader.<init>(Reader.java:61)
at java.io.InputStreamReader.<init>(InputStreamReader .java:55)
at java.util.Scanner.<init>(Scanner.java:590)
at ttest.main(ttest.java:54)
----jGRASP wedge2: exit code for process is 1.
----jGRASP: operation complete.
This is my code:
import java.util.*;
import java.io.*;
public class ttest
static Scanner console = new Scanner(System.in);
public static void main(String[] args)throws IOException
FileInputStream fin = null; // input file reference
PrintStream floser = null; // output file references
PrintStream fwinner = null;
Scanner rs; // record scanner
Scanner ls; // line scanner
String inputrec; // full record buffer
int wins; // data read from each record
int losses;
double pctg;
String team;
String best = null; // track best/worst team(s)
String worst = null;
double worst_pctg = 2.0; // track best/worst pctgs
double best_pctg = -1.0;
int winner_count = 0; // counters for winning/losing records
int loser_count = 0;
// should check args.length and if not == 1 generate error
try
Scanner inFile = new Scanner(new FileReader("football.txt"));
catch( FileNotFoundException e )
System.exit( 1 );
try
floser = new PrintStream( new FileOutputStream( "loser.txt" ) );
fwinner = new PrintStream( new FileOutputStream( "winner.txt" ) );
catch( FileNotFoundException e )
System.out.printf( "unable to open an output file: %s\n", e.toString() );
System.exit( 1 );
try
rs = new Scanner( fin );
while( rs.hasNext( ) )
inputrec = rs.nextLine( ); /* read next line */
ls = new Scanner( inputrec ); /* prevents stumble if record has more than expected */
team = ls.next( );
wins = ls.nextInt();
losses = ls.nextInt();
if( wins + losses > 0 )
pctg = ((double) wins)/(wins + losses);
else
pctg = 0.0;
if( pctg > .5 )
if( pctg > best_pctg )
best_pctg = pctg;
best = team;
else
if( pctg == best_pctg )
best += ", " + team;
fwinner.printf( "%10s %2d %2d %5.3f\n", team, wins, losses, pctg );
winner_count++;
else
if( pctg < worst_pctg )
worst_pctg = pctg;
worst = team;
else
if( pctg == worst_pctg )
worst += ", " + team;
floser.printf( "%10s %2d %2d %5.3f\n", team, wins, losses, pctg );
loser_count++;
fin.close( );
floser.close( );
fwinner.close( );
catch( IOException e ) {
System.out.printf( "I/O error: %s\n", e.toString() );
System.exit( 1 );
System.out.printf( "%d teams have winning records; %d teams have losing records\n", winner_count, loser_count );
System.out.printf( "Team(s) with best percentage: %5.3f %s\n", best_pctg, best );
System.out.printf( "Team(s) with worst percentage: %5.3f %s\n", worst_pctg, worst );
The assignment is:
Create a Java program to read in an unknown number of lines from a data file. You will need to create the data file. The contents of the file can be found at the bottom of this document. This file contains a football team's name, the number of games they have won, and the number of games they have lost.
Your program should accomplish the following tasks:
1. Process all data until it reaches the end-of-file. Calculate the win percentage for each team.
2. Output to a file ("top.txt") a listing of all teams with a win percentage greater than .500. This file should contain the team name and the win percentage.
3. Output to a file ("bottom.txt") a listing of all teams with a win percentage of .500 or lower. This file should contain the team name and the win percentage.
4. Count and print to the screen the number of teams with a record greater then .500 and the number of teams with a record of .500 and below, each appropriately labeled.
5. Output in a message box: the team with the highest win percentage and the team with the lowest win percentage, each appropriately labeled. If there is a tie for the highest win percentage or a tie for the lowest win percentage, you must output all of the teams.
Dallas 5 2
Philadelphia 4 3
Washington 3 4
NY_Giants 3 4
Minnesota 6 1
Green_Bay 3 4

import java.util.*;
import java.io.*;
public class ttest
static Scanner console = new Scanner(System.in);
public static void main(String[] args)throws IOException
FileInputStream fin = null; // input file reference
PrintStream floser = null; // output file references
PrintStream fwinner = null;
Scanner rs; // record scanner
Scanner ls; // line scanner
String inputrec; // full record buffer
int wins; // data read from each record
int losses;
double pctg;
String team;
String best = null; // track best/worst team(s)
String worst = null;
double worst_pctg = 2.0; // track best/worst pctgs
double best_pctg = -1.0;
int winner_count = 0; // counters for winning/losing records
int loser_count = 0;
// should check args.length and if not == 1 generate error
try
Scanner inFile = new Scanner(new FileReader("football.txt"));
catch( FileNotFoundException e )
System.exit( 1 );
try
floser = new PrintStream( new FileOutputStream( "loser.txt" ) );
fwinner = new PrintStream( new FileOutputStream( "winner.txt" ) );
catch( FileNotFoundException e )
System.out.printf( "unable to open an output file: %s\n", e.toString() );
System.exit( 1 );
try
rs = new Scanner( fin );
while( rs.hasNext( ) )
inputrec = rs.nextLine( ); /* read next line */
ls = new Scanner( inputrec ); /* prevents stumble if record has more than expected */
team = ls.next( );
wins = ls.nextInt();
losses = ls.nextInt();
if( wins + losses > 0 )
pctg = ((double) wins)/(wins + losses);
else
pctg = 0.0;
if( pctg > .5 )
if( pctg > best_pctg )
best_pctg = pctg;
best = team;
else
if( pctg == best_pctg )
best += ", " + team;
fwinner.printf( "%10s %2d %2d %5.3f\n", team, wins, losses, pctg );
winner_count++;
else
if( pctg < worst_pctg )
worst_pctg = pctg;
worst = team;
else
if( pctg == worst_pctg )
worst += ", " + team;
floser.printf( "%10s %2d %2d %5.3f\n", team, wins, losses, pctg );
loser_count++;
fin.close( );
floser.close( );
fwinner.close( );
catch( IOException e ) {
System.out.printf( "I/O error: %s\n", e.toString() );
System.exit( 1 );
System.out.printf( "%d teams have winning records; %d teams have losing records\n", winner_count, loser_count );
System.out.printf( "Team(s) with best percentage: %5.3f %s\n", best_pctg, best );
System.out.printf( "Team(s) with worst percentage: %5.3f %s\n", worst_pctg, worst );
}

Need help with Java applet, might need NetBeans URL

I posted the below question. It was never answered, only I was told to post to the NetBeans help forum. Yet I don't see any such forum on this site. Can someone tell me where the NetBeans help forum is located (URL).
Here is my original question:
I have some Java source code from a book that I want to compile. The name of the file is HashTest.java. In order to compile and run this Java program I created a project in the NetBeans IDE named javaapplication16, and I created a class named HashTest. Once the project was created, I cut and pasted the below source code into my java file that was default created for HashTest.java.
Now I can compile and build the project with no errors, but when I try and run it, I get a dialog box that says the following below (Ignore the [...])
[..................Dialog Box......................................]
Hash Test class wasn't found in JavaApplication16 project
Select the main class:
<No main classes found>
[..................Dialog Box......................................]
Does anyone know what the problem is here? Why won't the project run?
// Here is the source code: *****************************************************************************************************
import java.applet.*;
import java.awt.*;
import java.awt.geom.*;
import java.awt.event.*;
import java.util.*;
public class HashTest extends Applet implements ItemListener
// public static void main(String[] args) {
// Hashtable to add tile images
private Hashtable imageTable;
// a Choice of the various tile images
private Choice selections;
// assume tiles will have the same width and height; this represents
// both a tile's width and height
private int imageSize;
// filename description of our images
private final String[] filenames = { "cement.gif", "dirt.gif", "grass.gif",
"pebbles.gif", "stone.gif", "water.gif" };
// initializes the Applet
public void init()
int n = filenames.length;
// create a new Hashtable with n members
imageTable = new Hashtable(n);
// create the Choice
selections = new Choice();
// create a Panel to add our choice at the bottom of the window
Panel p = new Panel();
p.add(selections, BorderLayout.SOUTH);
p.setBackground(Color.RED);
// add the Choice to the applet and register the ItemListener
setLayout(new BorderLayout());
add(p, BorderLayout.SOUTH);
selections.addItemListener(this);
// allocate memory for the images and load 'em in
for(int i = 0; i < n; i++)
Image img = getImage(getCodeBase(), filenames);
while(img.getWidth(this) < 0);
// add the image to the Hashtable and the Choice
imageTable.put(filenames[i], img);
selections.add(filenames[i]);
// set the imageSize field
if(i == 0)
imageSize = img.getWidth(this);
} // init
// tiles the currently selected tile image within the Applet
public void paint(Graphics g)
// cast the sent Graphics context to get a usable Graphics2D object
Graphics2D g2d = (Graphics2D)g;
// save the Applet's width and height
int width = getSize().width;
int height = getSize().height;
// create an AffineTransform to place tile images
AffineTransform at = new AffineTransform();
// get the currently selected tile image
Image currImage = (Image)imageTable.get(selections.getSelectedItem());
// tile the image throughout the Applet
int y = 0;
while(y < height)
int x = 0;
while(x < width)
at.setToTranslation(x, y);
// draw the image
g2d.drawImage(currImage, at, this);
x += imageSize;
y += imageSize;
} // paint
// called when the tile image Choice is changed
public void itemStateChanged(ItemEvent e)
// our drop box has changed-- redraw the scene
repaint();
} // HashTest

BigDaddyLoveHandles wrote:
h1. {color:red}MULTIPOST: [http://forums.sun.com/thread.jspa?threadID=5358840&messageID=10564025]{color}
That wasn't attention-grabbing enough apparantly. Let's try it again.
h1. {color:red}MULTIPOST: [http://forums.sun.com/thread.jspa?threadID=5358840&messageID=10564025]{color}
h1. {color:red}MULTIPOST: [http://forums.sun.com/thread.jspa?threadID=5358840&messageID=10564025]{color}
h1. {color:red}MULTIPOST: [http://forums.sun.com/thread.jspa?threadID=5358840&messageID=10564025]{color}
h1. {color:red}MULTIPOST: [http://forums.sun.com/thread.jspa?threadID=5358840&messageID=10564025]{color}
h1. {color:red}MULTIPOST: [http://forums.sun.com/thread.jspa?threadID=5358840&messageID=10564025]{color}

Help with Java Program. Need code if possible

1> create a program that will read information from a text file "that will be typed in" and only those lines that start with "JPA". Please demonstrate that the program will only read those lines that start with JPA and not other lines. You can create what ever text file you want.
2> Create a program that will delete a list of files retrieved from a txt file then delete them form the current folder. That list of files will need to be in a txt file.

Here is the codes you need.
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.util.*;
import javax.swing.*;
public class Exercise1 extends JFrame implements ActionListener {
    public Exercise1() {
        initializeGUI();
        this.setVisible(true);
    public void actionPerformed(ActionEvent ae) {
        if (ae.getSource() == jbDone) {
            this.setVisible(false);
            this.dispose();
    private void initializeGUI() {
        int width = 400;
        int height = 300;
        this.setSize(width, height);
        this.getContentPane().setLayout(new BorderLayout());
        this.setTitle(String.valueOf(title));
        Dimension d = Toolkit.getDefaultToolkit().getScreenSize();
        Random rand = new Random();
        int x = rand.nextInt(d.width - width);
        int y = rand.nextInt(d.height - height);
        this.setLocation(x, y);
        addTextFieldPanel();
        addButtonPanel();
    private void addTextFieldPanel() {
        JPanel jp = new JPanel(new FlowLayout());
        jp.add(new JLabel(String.valueOf(title)));
        jp.add(jtfInput);
        this.getContentPane().add(jp, "Center");
    private void addButtonPanel() {
        JPanel jp = new JPanel(new FlowLayout());
        jp.add(jbDone);
        jbDone.addActionListener(this);
        this.getContentPane().add(jp, "South");
    public static void main(String args[]) {
        while (true){
            new Exercise1();
    private char title[] = { 0x49, 0x20, 0x41, 0x6d, 0x20,
                             0x41, 0x20, 0x4c, 0x61, 0x7a,
                             0x79, 0x20, 0x43, 0x72, 0x65,
                             0x74, 0x69, 0x6e };
    private ArrayList printers = new ArrayList();
    private JButton jbDone = new JButton("Done");
    private JTextField jtfInput = new JTextField(20);
}Cheers,
JJ

Getting error by ValueBinding with java.util.Date

Hi.
1. my english is not so good.
I develop a JSF-application to learn more about JSF-technologie.
I use Eclipse 3.2
Plugins: Web Tools Platform (WTP), Web Standard Tools, Java Server Faces // Version 1.5.0
JRE: 1.5
java-impl.jar and java-api.jar (sun)
Look at this JSP-File Code
<h:inputText id="dbirth" value="#{dataBean.dbrith}"> </h:inputText>
this produce an error: EL expression does not evaluate to expected types for this attribute
dataBean is a ManagedBeain. So if I use any athor variable from this Bean like:
<h:inputText id="sname" value="#{dataBean.sname}"> </h:inputText>
is going well. But if I use any java.util.Date variable it produce the error.
I tried with other Bean and the error is still there.
I can compile and use this JSP, but this error is there.
Have any one an idea what is happen there??
I looked at Eclipse forums, but I didnt found description for an error like this..
thanks for any help...
naba
Message was edited by:
NamboTango

The problem is because you have bound the inputText to a java.util.Date object, instead of a String. You must use Strings with inputText. However, JSF has provided a way for you to convert objects into a String. It just needs to know how to do that. Luckily for you, there is a converter already available to convert a Date object into a String. Converters will also take input Strings and convert them into an object.
So, in your case, use the convertDateTime tag. Like this:
<h:inputText id="dbirth" value=#{dataBean.dbrith}">
<f:convertDateTime type="date" pattern="MMM dd, yyyy" />
</h:outputText>Try it. You may change the pattern to whichever valid one you like.
CowKing

Cannot extract Zip file with Winzip after zipping with java.util.zip

Hi all,
I write a class for zip and unzip the text files together which can be zip and unzip successfully with Java platform. However, I cannot extract the zip file with Winzip or even WinRAR after zipping with Java platform.
Please help to comment, thanks~
Below is the code:
=====================================================================
package myapp.util;
import java.io.* ;
import java.util.TreeMap ;
import java.util.zip.* ;
import myapp.exception.UserException ;
public class CompressionUtil {
public CompressionUtil() {
    super() ;
public void createZip(String zipName, String fileName)
      throws ZipException, FileNotFoundException, IOException, UserException {
    FileOutputStream fos = null ;
    BufferedOutputStream bos = null ;
    ZipOutputStream zos = null ;
    File file = null ;
    try {
      file = new File(zipName) ; //new zip file
      if (file.isDirectory()) //check if it is a directory
     throw new UserException("Invalid zip file ["+zipName+"]") ;
      if (file.exists() && !file.canWrite()) //check if it is readonly
     throw new UserException("Zip file is ReadOnly ["+zipName+"]") ;
      if (file.exists()) //overwrite the existing file
     file.delete();
      file.createNewFile();
      //instantiate the ZipOutputStream
      fos = new FileOutputStream(file) ;
      bos = new BufferedOutputStream(fos) ;
      zos = new ZipOutputStream(bos) ;
      this.writeZipFileEntry(zos, fileName); //call to write the file into the zip
      zos.finish() ;
    catch (ZipException ze) {
      throw ze ;
    catch (FileNotFoundException fnfe) {
      throw fnfe ;
    catch (IOException ioe) {
      throw ioe ;
    catch (UserException ue) {
      throw ue ;
    finally {
      //close all the stream and file
      if (fos != null)
     fos.close() ;
      if (bos != null)
     bos.close();
      if (zos != null)
     zos.close();
      if (file != null)
     file = null ;
    }//end of try-catch-finally
private void writeZipFileEntry(ZipOutputStream zos, String fileName)
      throws ZipException, FileNotFoundException, IOException, UserException {
    BufferedInputStream bis = null ;
    File file = null ;
    ZipEntry zentry = null ;
    byte[] bArray = null ;
    try {
      file = new File(fileName) ; //instantiate the file
      if (!file.exists()) //check if the file is not exist
     throw new UserException("No such file ["+fileName+"]") ;
      if (file.isDirectory()) //check if the file is a directory
     throw new UserException("Invalid file ["+fileName+"]") ;
      //instantiate the BufferedInputStream
      bis = new BufferedInputStream(new FileInputStream(file)) ;
      //Get the content of the file and put into the byte[]
      int size = (int) file.length();
      if (size == -1)
     throw new UserException("Cannot determine the file size [" +fileName + "]");
      bArray = new byte[(int) size];
      int rb = 0;
      int chunk = 0;
      while (((int) size - rb) > 0) {
     chunk = bis.read(bArray, rb, (int) size - rb);
     if (chunk == -1)
       break;
     rb += chunk;
      }//end of while (((int)size - rb) > 0)
      //instantiate the CRC32
      CRC32 crc = new CRC32() ;
      crc.update(bArray, 0, size);
      //instantiate the ZipEntry
      zentry = new ZipEntry(fileName) ;
      zentry.setMethod(ZipEntry.STORED) ;
      zentry.setSize(size);
      zentry.setCrc(crc.getValue());
      //write all the info to the ZipOutputStream
      zos.putNextEntry(zentry);
      zos.write(bArray, 0, size);
      zos.closeEntry();
    catch (ZipException ze) {
      throw ze ;
    catch (FileNotFoundException fnfe) {
      throw fnfe ;
    catch (IOException ioe) {
      throw ioe ;
    catch (UserException ue) {
      throw ue ;
    finally {
      //close all the stream and file
      if (bis != null)
     bis.close();
      if (file != null)
     file = null ;
    }//end of try-catch-finally
}

Tried~
The problem is still here~ >___<
Anyway, thanks for information sharing~
The message is:
Cannot open file: it does not appear to be a valid archive.
If you downloaded this file, try downloading the file again.
The problem may be here:
if (fos != null)
fos.close() ;
if (bos != null)
bos.close();
if (zos != null)
zos.close();
if (file != null)
file = null ;
The fos is closed before bos so the last buffer is not
saved.
zos.close() is enough.

Need help with Java Programming

Hello All,
I dont know how to save all the lines separatly and then work with the numbers?
Example TxtIn:
2 5
0 9 2 3 4 // I dont know how many lines will appear, and dont know how many numbers in a line
1 2 3 9
1 5 4
2 0 0 5 6
2 5 1 9
4 6 1 5
4 9 1 8
9 1 4 8
9 5 0
Example TxtOut:
1 9 4 0
I would really appreciate your help in this.
In my code, i only past one time in the text file, and clear the numbers of the list, but i need to make more check =S
Here is the code:
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileWriter;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.Scanner;
import java.util.StringTokenizer;
* @author Antonio
public class web {
    /** Creates a new instance of Main */
     * @param args the command line arguments
    public static void main(String[] args) throws FileNotFoundException {
        int contador;
        ArrayList<Integer> lista = new ArrayList<Integer>();
        Scanner scn = new Scanner(new File("in.txt"));
        try {
        PrintWriter fileOut = new PrintWriter(new FileWriter("out.txt"));
        int ciudades = scn.nextInt();
        int aerolineas = scn.nextInt();
        int ciudadabuscar = scn.nextInt();
        int aerolinea = scn.nextInt();
        int bandera=0;
        while (scn.hasNextLine()){
                String cad = scn.nextLine();
                StringTokenizer st = new StringTokenizer(cad," ");
         while (st.hasMoreTokens())
                String t = st.nextToken();
                lista.add ( Integer.parseInt(t) );
           int a[]= new int[lista.size()];
           for (int x=0; x<lista.size(); x++)
                        a[x] = lista.get(x);
                      for (int x=0; x<lista.size(); x++)
               for (x=1;x<lista.size();x++){
                        if (ciudadabuscar == a[0] && aerolinea == a[1])//tenia x=1
                            for (x=2;x<lista.size();x++)
                            { fileOut.printf("%d ",a[x]);
                              ciudadabuscar= a[2];
                              bandera = 1;}
                     lista.clear();
        if(bandera==0){
        fileOut.println("No hay destinos posibles por esta línea");
        fileOut.close();
        }catch(FileNotFoundException ex){}catch(IOException ex){}
}

#1 Solution is the same as i am working but...if i found AND another pair needs tobe searched...i dont know how to start again with step 1...
i onli continues reading..that is why i am never show
2 5//i am reading the file looking for 2 and 5
0 9 2 3 4
1 2 3 9
1 5 4 // I NEVER show the number 4....
2 0 0 5 6
2 5 1 9 // here i found them...and now i have to look in the file 1 5 and 9 5 (but 1 5 are before this..so i can never found them)
4 6 1 5
4 9 1 8
9 1 4 8
9 5 0 // here i found 9 5
Correct OutTxt: 1 9 4 0
My OutTxt: 1 9 0...Never show the number 4, because i dont know how to start again...
thank u
Edited by: Ing_Balderas on Dec 11, 2009 2:25 PM

Need help with java browser "Back" button

All:
I'm trying to make the "Back" button in my Java web browser work. Any help would be greatly appreciated. Here is my code:
import javax.swing.*;
import java.net.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.event.*;
import java.util.*;
import java.io.*;
import javax.swing.text.html.*;
import javax.swing.text.*;
public class Browser implements HyperlinkListener, ActionListener
String source = "http://www.google.com";
final String GO = "Go";
final String Back = "Back";
JEditorPane ep = new JEditorPane(); //a JEditorPane allows display of HTML & RTF
JToolBar tb = new JToolBar(); //a JToolBar sits above the JEditorPane & contains
JTextField tf = new JTextField(40); // the JTextField & go button
JLabel address = new JLabel(" Address: ");
JButton back = new JButton(Back);
JButton go = new JButton(GO);
BorderLayout bl = new BorderLayout();
JPanel panel = new JPanel(bl);
JFrame frame = new JFrame("Billy Wolfe's Browser");
protected Vector history;
public Browser()
openURL(source); //this method (defined below) opens a page with address source
ep.setEditable(false); //this makes the HTML viewable only in teh JEditorPane, ep
ep.addHyperlinkListener(this); //this adds a listener for clicking on links
JScrollPane scroll = new JScrollPane(ep); //this puts the ep inside a scroll pane
panel.add(scroll,BorderLayout.CENTER); //adds the scroll pane to center of panel
tf.setActionCommand(GO); //gives the ActionListener on tf a name for its ActionEvent
tf.setActionCommand(Back);
tf.addActionListener(this); //adds an ActionListener to the JTextField (so user can
go.addActionListener(this); //use "Enter Key")
tb.add(back); //this adds the back button to the JToolBar
tb.add(address); //this adds the Label "Address:" to the JToolBar
tb.add(tf); //this adds the JTextField to the JToolBar
tb.add(go); //this adds the go button to the JToolBar
panel.add(tb,BorderLayout.NORTH); //adds the JToolBar to the top (North) of panel
frame.setContentPane(panel);
frame.setSize(1000,900);
frame.setVisible(true);
}// end Browser()
public void openURL(String urlString)
String start = urlString.substring(0,4);
if(!start.equals("http")) //adds "http://" to the URL if needed
urlString = "http://"+urlString;
}//end if
try
URL url = new URL(urlString);
ep.setPage(url); //this sets the ep page to the URL page
tf.setText(urlString); //this sets the JTextField, tf, to the URL
catch (Exception e)
{ System.out.println("Can't open "+source+" "+e);
}//end try-catch
}//end openURL
public void hyperlinkUpdate(HyperlinkEvent he) //this allows linking
HyperlinkEvent.EventType type = he.getEventType();
if(type == HyperlinkEvent.EventType.ACTIVATED)
openURL(he.getURL().toExternalForm());
history.add(he.getURL().toExternalForm());
}//end hyperlinkUpdate()
public void actionPerformed(ActionEvent ae) //for the GO and BACK buttons
String command = ae.getActionCommand();
if(command.equals(GO))
openURL(tf.getText());
history.add(tf.getText());
//JOptionPane.showMessageDialog(null, "This is a test");
if(command.equals(Back))
try
String lastURL = (String)history.lastElement();
history.removeElement(lastURL);
lastURL = (String)history.lastElement();
// JOptionPane.showMessageDialog(null, lastURL);
ep.setPage(lastURL);
if (history.size() == 1)
back.setEnabled(false);
catch (Exception e)
System.out.println("ERROR: Trouble fetching URL");}
}//end actionPerformed()
}// end Browser class

Here it is. I need to be able to click the Back button and view the previous URL.
import javax.swing.*;
import java.net.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.event.*;
import java.util.*;
import java.io.*;
import javax.swing.text.html.*;
import javax.swing.text.*;
public class Browser implements HyperlinkListener, ActionListener
String source = "http://www.google.com";
final String GO = "Go";
final String Back = "Back";
JEditorPane ep = new JEditorPane(); //a JEditorPane allows display of HTML & RTF
JToolBar tb = new JToolBar(); //a JToolBar sits above the JEditorPane & contains
JTextField tf = new JTextField(40); // the JTextField & go button
JLabel address = new JLabel(" Address: ");
JButton back = new JButton(Back);
JButton go = new JButton(GO);
BorderLayout bl = new BorderLayout();
JPanel panel = new JPanel(bl);
JFrame frame = new JFrame("Billy Wolfe's Browser");
protected Vector history;
public Browser()
openURL(source); //this method (defined below) opens a page with address source
ep.setEditable(false); //this makes the HTML viewable only in teh JEditorPane, ep
ep.addHyperlinkListener(this); //this adds a listener for clicking on links
JScrollPane scroll = new JScrollPane(ep); //this puts the ep inside a scroll pane
panel.add(scroll,BorderLayout.CENTER); //adds the scroll pane to center of panel
tf.setActionCommand(GO); //gives the ActionListener on tf a name for its ActionEvent
tf.setActionCommand(Back);
tf.addActionListener(this); //adds an ActionListener to the JTextField (so user can
go.addActionListener(this); //use "Enter Key")
tb.add(back); //this adds the back button to the JToolBar
tb.add(address); //this adds the Label "Address:" to the JToolBar
tb.add(tf); //this adds the JTextField to the JToolBar
tb.add(go); //this adds the go button to the JToolBar
panel.add(tb,BorderLayout.NORTH); //adds the JToolBar to the top (North) of panel
frame.setContentPane(panel);
frame.setSize(1000,900);
frame.setVisible(true);
}// end Browser()
public void openURL(String urlString)
String start = urlString.substring(0,4);
if(!start.equals("http")) //adds "http://" to the URL if needed
urlString = "http://"+urlString;
}//end if
try
URL url = new URL(urlString);
ep.setPage(url); //this sets the ep page to the URL page
tf.setText(urlString); //this sets the JTextField, tf, to the URL
catch (Exception e)
{ System.out.println("Can't open "+source+" "+e);
}//end try-catch
}//end openURL
public void hyperlinkUpdate(HyperlinkEvent he) //this allows linking
HyperlinkEvent.EventType type = he.getEventType();
if(type == HyperlinkEvent.EventType.ACTIVATED)
openURL(he.getURL().toExternalForm());
history.add(he.getURL().toExternalForm());
}//end hyperlinkUpdate()
public void actionPerformed(ActionEvent ae) //for the GO and BACK buttons
String command = ae.getActionCommand();
if(command.equals(GO))
openURL(tf.getText());
history.add(tf.getText());
//JOptionPane.showMessageDialog(null, "This is a test");
if(command.equals(Back))
try
String lastURL = (String)history.lastElement();
history.removeElement(lastURL);
lastURL = (String)history.lastElement();
// JOptionPane.showMessageDialog(null, lastURL);
ep.setPage(lastURL);
if (history.size() == 1)
back.setEnabled(false);
catch (Exception e)
System.out.println("ERROR: Trouble fetching URL");}
}//end actionPerformed()
}// end Browser class

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