Help me in my chat program please

hi,
Im doing chat program same as yahoo messenger using Java.Please help me in creating rooms....so that it will be a great help for me to finish my project..
Thanks in advance
PadmaPriya.

hi,
Actually i have a common room in which people enter through a login screen and chat...it shows the user list .
what i want to do is i want to add a combo box in the login screen with mulitple rooms...the user should select rooms and then must be able to chat....in their rooms...
so that many rooms would function at a time..and people will be chatting correspondingly....can u please help me in doing that...
Thanks in advance
PadmaPriya.

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    Here is the server code that sends messages to the clients:
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    The code posted just sends any data it receives back to the person who sent it. To get it to work there, you probably should flush after the println. I believe your mother taught you always to flush. It seems you have forgotten.

  • Help needed on a chat program..............

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  • Help:something whin a Chat program

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  • I need help instantly on this program please

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    private static int first=z[0];
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              private static int n=100000;
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              int seqSearch(z;35467;n); //method call 4 key where key in the left half
              int binSearch(z;first;last;35467);
              int seqSearch(z;89703;n); //method call 4 key where key in the right half
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    and what about the dukes, offer 10 (never to be awarded, of course)
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  • Need Help with Simple Chat Program

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    synchronized( outputStreams ) {
    // For each client ...
    for (Enumeration e = outputStreams.keys(); e.hasMoreElements(); ) {
    // ... get the output stream ...
    Socket tmp=(Socket)e.nextElement();
    if(!tmp.equals(socket))
    try {
    DataOutputStream dout = new DataOutputStream(tmp.getOutputStream());
    // ... and send the message
    dout.write(voice,0,44096);
    dout.flush();
    } catch( IOException ie ) { System.out.println( ie ); }
    // Remove a socket, and it's corresponding output stream, from our
    // list. This is usually called by a connection thread that has
    // discovered that the connectin to the client is dead.
    void removeConnection( Socket s ) {
    // Synchronize so we don't mess up sendToAll() while it walks
    // down the list of all output streamsa
    synchronized( outputStreams ) {
    // Tell the world
    System.out.println( "Removing connection to "+s );
    // Remove it from our hashtable/list
    outputStreams.remove( s );
    // Make sure it's closed
    try {
    s.close();
    } catch( IOException ie ) {
    System.out.println( "Error closing "+s );
    ie.printStackTrace();
    // Main routine
    // Usage: java Server <port>
    static public void main( String args[] ) throws Exception {
    // Get the port # from the command line
    int port = Integer.parseInt( args[0] );
    // Create a Server object, which will automatically begin
    // accepting connections.
    new Server( port );
    package com.longshine.voice;
    import java.net.*;
    import java.io.*;
    import java.sql.*;
    import java.io.*;
    import java.net.*;
    public class VoiceServer extends Thread
    // The Server that spawned us
    private Server server;
    final int bufSize = 16384;
    // The Socket connected to our client
    private Socket socket;
    // Constructor.
    public VoiceServer( Server server, Socket socket ) {
    // Save the parameters
    this.server = server;
    this.socket = socket;
    // Start up the thread
    start();
    // This runs in a separate thread when start() is called in the
    // constructor.
    public void run() {
    try {
    // Create a DataInputStream for communication; the client
    // is using a DataOutputStream to write to us
    DataInputStream din = new DataInputStream( socket.getInputStream() );
    byte[] voice=new byte[44096];
    // Over and over, forever ...
    while (true) {
    // ... read the next message ...
    // int bytes = din.read(voice,0,44096);
    int bytes = din.read(voice);
    // ... and have the server send it to all clients
    server.sendToAll(voice,socket);
    } catch( EOFException ie ) {
    // This doesn't need an error message
    } catch( IOException ie ) {
    // This does; tell the world!
    ie.printStackTrace();
    } finally {
    // The connection is closed for one reason or another,
    // so have the server dealing with it
    server.removeConnection( socket );
    package com.longshine.voice;
    import java.io.*;
    import java.net.*;
    public class Client {
    private String host="";
    private String port="";
    private Socket socket;
    private DataOutputStream dout;
    private DataInputStream din;
    private Capture capture=null;
    private Play play=null;
    public Client(String host,String port) {
    this.host=host;
    this.port=port;
    public void init()
    try
    socket = new Socket( host, Integer.parseInt(port));
    din = new DataInputStream( socket.getInputStream() );
    dout = new DataOutputStream( socket.getOutputStream());
    capture=new Capture(dout);
    play=new Play(din);
    catch(Exception e)
    e.printStackTrace();
    public static void main(String[] args) {
    Client client = new Client("172.18.220.176","5678");
    client.init();
    if(args[0].equalsIgnoreCase("say"))
    client.capture.start();
    if(args[0].equalsIgnoreCase("hear"))
    client.play.start();
    package com.longshine.voice;
    import java.io.*;
    import java.util.Vector;
    import java.util.Enumeration;
    import javax.sound.sampled.*;
    import java.text.*;
    import java.net.*;
    public class Play implements Runnable {
    SourceDataLine line;
    Thread thread;
    String errStr=null;
    DataInputStream in=null;
    AudioInputStream audioInputStream;
    final int bufSize = 16384;
    int duration=0;
    public Play(DataInputStream in)
    this.in=in;
    public void start() {
    errStr = null;
    thread = new Thread(this);
    thread.setName("Playback");
    thread.start();
    public void stop() {
    thread = null;
    private void shutDown(String message) {
    if ((errStr = message) != null) {
    System.err.println(errStr);
    if (thread != null) {
    thread = null;
    public void createAudioInputStream() {
    if (in != null ) {
    try {
    errStr = null;
    java.io.BufferedInputStream oin = new java.io.BufferedInputStream(in);
    audioInputStream = AudioSystem.getAudioInputStream(oin);
    } catch (Exception ex) {
    ex.printStackTrace();
    } else {
    public void run() {
    // reload the file if loaded by file
    if (in != null) {
    // createAudioInputStream();
    // make sure we have something to play
    // if (audioInputStream == null) {
    // shutDown("No loaded audio to play back");
    // return;
    // reset to the beginnning of the stream
    // try {
    // audioInputStream.reset();
    // } catch (Exception e) {
    // shutDown("Unable to reset the stream\n" + e);
    // return;
    // get an AudioInputStream of the desired format for playback
    AudioFormat format = getFormat();
    audioInputStream=new AudioInputStream(in, format, AudioSystem.NOT_SPECIFIED);
    AudioInputStream playbackInputStream = AudioSystem.getAudioInputStream(format, audioInputStream);
    if (playbackInputStream == null) {
    shutDown("Unable to convert stream of format " + audioInputStream + " to format " + format);
    return;
    // define the required attributes for our line,
    // and make sure a compatible line is supported.
    DataLine.Info info = new DataLine.Info(SourceDataLine.class,
    format);
    if (!AudioSystem.isLineSupported(info)) {
    shutDown("Line matching " + info + " not supported.");
    return;
    // get and open the source data line for playback.
    try {
    line = (SourceDataLine) AudioSystem.getLine(info);
    line.open(format, bufSize);
    } catch (LineUnavailableException ex) {
    shutDown("Unable to open the line: " + ex);
    return;
    // play back the captured audio data
    int frameSizeInBytes = format.getFrameSize();
    int bufferLengthInFrames = line.getBufferSize() / 8;
    int bufferLengthInBytes = bufferLengthInFrames * frameSizeInBytes;
    byte[] data = new byte[bufferLengthInBytes];
    int numBytesRead = 0;
    // start the source data line
    line.start();
    while (thread != null) {
    try {
    if ((numBytesRead = playbackInputStream.read(data)) == -1) {
    break;
    int numBytesRemaining = numBytesRead;
    while (numBytesRemaining > 0 ) {
    numBytesRemaining -= line.write(data, 0, numBytesRemaining);
    } catch (Exception e) {
    shutDown("Error during playback: " + e);
    break;
    // we reached the end of the stream. let the data play out, then
    // stop and close the line.
    if (thread != null) {
    line.drain();
    line.stop();
    line.close();
    line = null;
    shutDown(null);
    public AudioFormat getFormat() {
    AudioFormat.Encoding encoding = AudioFormat.Encoding.ULAW;
    String encString = "linear";
    float rate = Float.valueOf("44100").floatValue();
    int sampleSize = 16;
    String signedString = "signed";
    boolean bigEndian = true;
    int channels = 2;
    if (encString.equals("linear")) {
    if (signedString.equals("signed")) {
    encoding = AudioFormat.Encoding.PCM_SIGNED;
    } else {
    encoding = AudioFormat.Encoding.PCM_UNSIGNED;
    } else if (encString.equals("alaw")) {
    encoding = AudioFormat.Encoding.ALAW;
    return new AudioFormat(encoding, rate, sampleSize,
    channels, (sampleSize/8)*channels, rate, bigEndian);
    } // End class Playback
    package com.longshine.voice;
    import java.io.*;
    import java.util.Vector;
    import java.util.Enumeration;
    import javax.sound.sampled.*;
    import java.text.*;
    import java.net.*;
    public class Capture implements Runnable {
    TargetDataLine line;
    Thread thread;
    String errStr=null;
    DataOutputStream out=null;
    AudioInputStream audioInputStream;
    final int bufSize = 16384;
    int duration=0;
    public Capture(DataOutputStream out)
    this.out=out;
    public void start() {
    errStr = null;
    thread = new Thread(this);
    thread.setName("Playback");
    thread.start();
    public void stop() {
    thread = null;
    private void shutDown(String message) {
    if ((errStr = message) != null) {
    System.out.println(errStr);
    if (thread != null) {
    thread = null;
    public AudioFormat getFormat() {
    AudioFormat.Encoding encoding = AudioFormat.Encoding.ULAW;
    String encString = "linear";
    float rate = Float.valueOf("44100").floatValue();
    int sampleSize = 16;
    String signedString = "signed";
    boolean bigEndian = true;
    int channels = 2;
    if (encString.equals("linear")) {
    if (signedString.equals("signed")) {
    encoding = AudioFormat.Encoding.PCM_SIGNED;
    } else {
    encoding = AudioFormat.Encoding.PCM_UNSIGNED;
    } else if (encString.equals("alaw")) {
    encoding = AudioFormat.Encoding.ALAW;
    return new AudioFormat(encoding, rate, sampleSize,
    channels, (sampleSize/8)*channels, rate, bigEndian);
    public void run() {
    duration = 0;
    audioInputStream = null;
    // define the required attributes for our line,
    // and make sure a compatible line is supported.
    AudioFormat format = getFormat();
    DataLine.Info info = new DataLine.Info(TargetDataLine.class,
    format);
    if (!AudioSystem.isLineSupported(info)) {
    shutDown("Line matching " + info + " not supported.");
    return;
    // get and open the target data line for capture.
    try {
    line = (TargetDataLine) AudioSystem.getLine(info);
    line.open(format, line.getBufferSize());
    } catch (LineUnavailableException ex) {
    shutDown("Unable to open the line: " + ex);
    return;
    } catch (SecurityException ex) {
    shutDown(ex.toString());
    return;
    } catch (Exception ex) {
    shutDown(ex.toString());
    return;
    // play back the captured audio data
    int frameSizeInBytes = format.getFrameSize();
    int bufferLengthInFrames = line.getBufferSize() / 8;
    int bufferLengthInBytes = bufferLengthInFrames * frameSizeInBytes;
    byte[] data = new byte[bufferLengthInBytes];
    int numBytesRead;
    line.start();
    try
    while (thread != null) {
    if((numBytesRead = line.read(data, 0, bufferLengthInBytes)) == -1) {
    break;
    if(data.length>0)
    out.write(data, 0, numBytesRead);
    out.flush();
    catch (Exception e)
    e.printStackTrace();
    // we reached the end of the stream. stop and close the line.
    line.stop();
    line.close();
    line = null;
    // stop and close the output stream
    try {
    out.flush();
    out.close();
    } catch (IOException ex) {
    ex.printStackTrace();
    } // End class Capture

    After a few days work, I have completed the mian voice chat program. I know there are so many people like me that wants that. I post these program. i will complete gui work later. and there is a problem in the program. if the speaking one do not speak for a while, the listening client will hear noise. Can some one help me.
    package com.longshine.voice;
    import java.io.*;
    import java.net.*;
    import java.util.*;
    public class Server
    // The ServerSocket we'll use for accepting new connections
    private ServerSocket ss;
    // A mapping from sockets to DataOutputStreams. This will
    // help us avoid having to create a DataOutputStream each time
    // we want to write to a stream.
    private Hashtable outputStreams = new Hashtable();
    final int bufSize = 16384;
    //current speak_man
    private int speakman=-1;
    // Constructor and while-accept loop all in one.
    public Server( int port ) throws IOException {
    // All we have to do is listen
    listen( port );
    private void listen( int port ) throws IOException {
    // Create the ServerSocket
    ss = new ServerSocket( port );
    // Tell the world we're ready to go
    System.out.println( "Listening on "+ss );
    // Keep accepting connections forever
    while (true) {
    // Grab the next incoming connection
    Socket s = ss.accept();
    // Tell the world we've got it
    System.out.println( "Connection from "+s );
    // Create a DataOutputStream for writing data to the
    // other side
    DataOutputStream dout = new DataOutputStream( s.getOutputStream() );
    // Save this stream so we don't need to make it again
    outputStreams.put( s, dout );
    // Create a new thread for this connection, and then forget
    // about it
    new VoiceServer( this, s );
    // Get an enumeration of all the OutputStreams, one for each client
    // connected to us
    Enumeration getOutputStreams() {
    return outputStreams.elements();
    // Send a message to all clients (utility routine)
    void sendToAll( byte[] voice ,Socket socket) {
    // We synchronize on this because another thread might be
    // calling removeConnection() and this would screw us up
    // as we tried to walk through the list
    synchronized( outputStreams ) {
    // For each client ...
    for (Enumeration e = outputStreams.keys(); e.hasMoreElements(); ) {
    // ... get the output stream ...
    Socket tmp=(Socket)e.nextElement();
    if(!tmp.equals(socket))
    try {
    DataOutputStream dout = new DataOutputStream(tmp.getOutputStream());
    // ... and send the message
    dout.write(voice,0,44096);
    dout.flush();
    } catch( IOException ie ) { System.out.println( ie ); }
    // Remove a socket, and it's corresponding output stream, from our
    // list. This is usually called by a connection thread that has
    // discovered that the connectin to the client is dead.
    void removeConnection( Socket s ) {
    // Synchronize so we don't mess up sendToAll() while it walks
    // down the list of all output streamsa
    synchronized( outputStreams ) {
    // Tell the world
    System.out.println( "Removing connection to "+s );
    // Remove it from our hashtable/list
    outputStreams.remove( s );
    // Make sure it's closed
    try {
    s.close();
    } catch( IOException ie ) {
    System.out.println( "Error closing "+s );
    ie.printStackTrace();
    // Main routine
    // Usage: java Server <port>
    static public void main( String args[] ) throws Exception {
    // Get the port # from the command line
    int port = Integer.parseInt( args[0] );
    // Create a Server object, which will automatically begin
    // accepting connections.
    new Server( port );
    package com.longshine.voice;
    import java.net.*;
    import java.io.*;
    import java.sql.*;
    import java.io.*;
    import java.net.*;
    public class VoiceServer extends Thread
    // The Server that spawned us
    private Server server;
    final int bufSize = 16384;
    // The Socket connected to our client
    private Socket socket;
    // Constructor.
    public VoiceServer( Server server, Socket socket ) {
    // Save the parameters
    this.server = server;
    this.socket = socket;
    // Start up the thread
    start();
    // This runs in a separate thread when start() is called in the
    // constructor.
    public void run() {
    try {
    // Create a DataInputStream for communication; the client
    // is using a DataOutputStream to write to us
    DataInputStream din = new DataInputStream( socket.getInputStream() );
    byte[] voice=new byte[44096];
    // Over and over, forever ...
    while (true) {
    // ... read the next message ...
    // int bytes = din.read(voice,0,44096);
    int bytes = din.read(voice);
    // ... and have the server send it to all clients
    server.sendToAll(voice,socket);
    } catch( EOFException ie ) {
    // This doesn't need an error message
    } catch( IOException ie ) {
    // This does; tell the world!
    ie.printStackTrace();
    } finally {
    // The connection is closed for one reason or another,
    // so have the server dealing with it
    server.removeConnection( socket );
    package com.longshine.voice;
    import java.io.*;
    import java.net.*;
    public class Client {
    private String host="";
    private String port="";
    private Socket socket;
    private DataOutputStream dout;
    private DataInputStream din;
    private Capture capture=null;
    private Play play=null;
    public Client(String host,String port) {
    this.host=host;
    this.port=port;
    public void init()
    try
    socket = new Socket( host, Integer.parseInt(port));
    din = new DataInputStream( socket.getInputStream() );
    dout = new DataOutputStream( socket.getOutputStream());
    capture=new Capture(dout);
    play=new Play(din);
    catch(Exception e)
    e.printStackTrace();
    public static void main(String[] args) {
    Client client = new Client("172.18.220.176","5678");
    client.init();
    if(args[0].equalsIgnoreCase("say"))
    client.capture.start();
    if(args[0].equalsIgnoreCase("hear"))
    client.play.start();
    package com.longshine.voice;
    import java.io.*;
    import java.util.Vector;
    import java.util.Enumeration;
    import javax.sound.sampled.*;
    import java.text.*;
    import java.net.*;
    public class Play implements Runnable {
    SourceDataLine line;
    Thread thread;
    String errStr=null;
    DataInputStream in=null;
    AudioInputStream audioInputStream;
    final int bufSize = 16384;
    int duration=0;
    public Play(DataInputStream in)
    this.in=in;
    public void start() {
    errStr = null;
    thread = new Thread(this);
    thread.setName("Playback");
    thread.start();
    public void stop() {
    thread = null;
    private void shutDown(String message) {
    if ((errStr = message) != null) {
    System.err.println(errStr);
    if (thread != null) {
    thread = null;
    public void createAudioInputStream() {
    if (in != null ) {
    try {
    errStr = null;
    java.io.BufferedInputStream oin = new java.io.BufferedInputStream(in);
    audioInputStream = AudioSystem.getAudioInputStream(oin);
    } catch (Exception ex) {
    ex.printStackTrace();
    } else {
    public void run() {
    // reload the file if loaded by file
    if (in != null) {
    // createAudioInputStream();
    // make sure we have something to play
    // if (audioInputStream == null) {
    // shutDown("No loaded audio to play back");
    // return;
    // reset to the beginnning of the stream
    // try {
    // audioInputStream.reset();
    // } catch (Exception e) {
    // shutDown("Unable to reset the stream\n" + e);
    // return;
    // get an AudioInputStream of the desired format for playback
    AudioFormat format = getFormat();
    audioInputStream=new AudioInputStream(in, format, AudioSystem.NOT_SPECIFIED);
    AudioInputStream playbackInputStream = AudioSystem.getAudioInputStream(format, audioInputStream);
    if (playbackInputStream == null) {
    shutDown("Unable to convert stream of format " + audioInputStream + " to format " + format);
    return;
    // define the required attributes for our line,
    // and make sure a compatible line is supported.
    DataLine.Info info = new DataLine.Info(SourceDataLine.class,
    format);
    if (!AudioSystem.isLineSupported(info)) {
    shutDown("Line matching " + info + " not supported.");
    return;
    // get and open the source data line for playback.
    try {
    line = (SourceDataLine) AudioSystem.getLine(info);
    line.open(format, bufSize);
    } catch (LineUnavailableException ex) {
    shutDown("Unable to open the line: " + ex);
    return;
    // play back the captured audio data
    int frameSizeInBytes = format.getFrameSize();
    int bufferLengthInFrames = line.getBufferSize() / 8;
    int bufferLengthInBytes = bufferLengthInFrames * frameSizeInBytes;
    byte[] data = new byte[bufferLengthInBytes];
    int numBytesRead = 0;
    // start the source data line
    line.start();
    while (thread != null) {
    try {
    if ((numBytesRead = playbackInputStream.read(data)) == -1) {
    break;
    int numBytesRemaining = numBytesRead;
    while (numBytesRemaining > 0 ) {
    numBytesRemaining -= line.write(data, 0, numBytesRemaining);
    } catch (Exception e) {
    shutDown("Error during playback: " + e);
    break;
    // we reached the end of the stream. let the data play out, then
    // stop and close the line.
    if (thread != null) {
    line.drain();
    line.stop();
    line.close();
    line = null;
    shutDown(null);
    public AudioFormat getFormat() {
    AudioFormat.Encoding encoding = AudioFormat.Encoding.ULAW;
    String encString = "linear";
    float rate = Float.valueOf("44100").floatValue();
    int sampleSize = 16;
    String signedString = "signed";
    boolean bigEndian = true;
    int channels = 2;
    if (encString.equals("linear")) {
    if (signedString.equals("signed")) {
    encoding = AudioFormat.Encoding.PCM_SIGNED;
    } else {
    encoding = AudioFormat.Encoding.PCM_UNSIGNED;
    } else if (encString.equals("alaw")) {
    encoding = AudioFormat.Encoding.ALAW;
    return new AudioFormat(encoding, rate, sampleSize,
    channels, (sampleSize/8)*channels, rate, bigEndian);
    } // End class Playback
    package com.longshine.voice;
    import java.io.*;
    import java.util.Vector;
    import java.util.Enumeration;
    import javax.sound.sampled.*;
    import java.text.*;
    import java.net.*;
    public class Capture implements Runnable {
    TargetDataLine line;
    Thread thread;
    String errStr=null;
    DataOutputStream out=null;
    AudioInputStream audioInputStream;
    final int bufSize = 16384;
    int duration=0;
    public Capture(DataOutputStream out)
    this.out=out;
    public void start() {
    errStr = null;
    thread = new Thread(this);
    thread.setName("Playback");
    thread.start();
    public void stop() {
    thread = null;
    private void shutDown(String message) {
    if ((errStr = message) != null) {
    System.out.println(errStr);
    if (thread != null) {
    thread = null;
    public AudioFormat getFormat() {
    AudioFormat.Encoding encoding = AudioFormat.Encoding.ULAW;
    String encString = "linear";
    float rate = Float.valueOf("44100").floatValue();
    int sampleSize = 16;
    String signedString = "signed";
    boolean bigEndian = true;
    int channels = 2;
    if (encString.equals("linear")) {
    if (signedString.equals("signed")) {
    encoding = AudioFormat.Encoding.PCM_SIGNED;
    } else {
    encoding = AudioFormat.Encoding.PCM_UNSIGNED;
    } else if (encString.equals("alaw")) {
    encoding = AudioFormat.Encoding.ALAW;
    return new AudioFormat(encoding, rate, sampleSize,
    channels, (sampleSize/8)*channels, rate, bigEndian);
    public void run() {
    duration = 0;
    audioInputStream = null;
    // define the required attributes for our line,
    // and make sure a compatible line is supported.
    AudioFormat format = getFormat();
    DataLine.Info info = new DataLine.Info(TargetDataLine.class,
    format);
    if (!AudioSystem.isLineSupported(info)) {
    shutDown("Line matching " + info + " not supported.");
    return;
    // get and open the target data line for capture.
    try {
    line = (TargetDataLine) AudioSystem.getLine(info);
    line.open(format, line.getBufferSize());
    } catch (LineUnavailableException ex) {
    shutDown("Unable to open the line: " + ex);
    return;
    } catch (SecurityException ex) {
    shutDown(ex.toString());
    return;
    } catch (Exception ex) {
    shutDown(ex.toString());
    return;
    // play back the captured audio data
    int frameSizeInBytes = format.getFrameSize();
    int bufferLengthInFrames = line.getBufferSize() / 8;
    int bufferLengthInBytes = bufferLengthInFrames * frameSizeInBytes;
    byte[] data = new byte[bufferLengthInBytes];
    int numBytesRead;
    line.start();
    try
    while (thread != null) {
    if((numBytesRead = line.read(data, 0, bufferLengthInBytes)) == -1) {
    break;
    if(data.length>0)
    out.write(data, 0, numBytesRead);
    out.flush();
    catch (Exception e)
    e.printStackTrace();
    // we reached the end of the stream. stop and close the line.
    line.stop();
    line.close();
    line = null;
    // stop and close the output stream
    try {
    out.flush();
    out.close();
    } catch (IOException ex) {
    ex.printStackTrace();
    } // End class Capture

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