Building a chat program in java

i am trying to build a chat program in java but don't know how to start or where to get the source code. Chatting can be done with the user of the selected IP address displayed in the console.
Can anyone help me ?

hey, i'm reading this book now, try this link:
http://manning.spindoczine.com/sbe/
i think it has something about chat program. good luck:)

Similar Messages

Need Help with Simple Chat Program

Hello Guys,
I'm fairly new to Java and I have a quick question regarding a simple chat program in java. My problem is that I have a simple chat program that runs from its own JFrame etc. Most of you are probably familiar with the code below, i got it from one of my java books. In any case, what I'm attempting to do is integrate this chat pane into a gui that i have created. I attempted to call an instace of the Client class from my gui program so that I can use the textfield and textarea contained in my app, but it will not allow me to do it. Would I need to integrate this code into the code for my Gui class. I have a simple program that contains chat and a game. The code for the Client is listed below.
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.net.*;
import javax.swing.*;
public class Client
extends JPanel {
public static void main(String[] args) throws IOException {
String name = args[0];
String host = args[1];
int port = Integer.parseInt(args[2]);
final Socket s = new Socket(host, port);
final Client c = new Client(name, s);
JFrame f = new JFrame("Client : " + name);
f.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent we) {
c.shutDown();
System.exit(0);
f.setSize(300, 300);
f.setLocation(100, 100);
f.setContentPane(c);
f.setVisible(true);
private String mName;
private JTextArea mOutputArea;
private JTextField mInputField;
private PrintWriter mOut;
public Client(final String name, Socket s)
throws IOException {
mName = name;
createUI();
wireNetwork(s);
wireEvents();
public void shutDown() {
mOut.println("");
mOut.close();
protected void createUI() {
setLayout(new BorderLayout());
mOutputArea = new JTextArea();
mOutputArea.setLineWrap(true);
mOutputArea.setEditable(false);
add(new JScrollPane(mOutputArea), BorderLayout.CENTER);
mInputField = new JTextField(20);
JPanel controls = new JPanel();
controls.add(mInputField);
add(controls, BorderLayout.SOUTH);
mInputField.requestFocus();
protected void wireNetwork(Socket s) throws IOException {
mOut = new PrintWriter(s.getOutputStream(), true);
final String eol = System.getProperty("line.separator");
new Listener(s.getInputStream()) {
public void processLine(String line) {
mOutputArea.append(line + eol);
mOutputArea.setCaretPosition(
mOutputArea.getDocument().getLength());
protected void wireEvents() {
mInputField.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent ae) {
String line = mInputField.getText();
if (line.length() == 0) return;
mOut.println(mName + " : " + line);
mInputField.setText("");

Thanks for ur help!i have moved BufferedReader outside the loop. I dont think i am getting exception as i can c the output once.What i am trying to do is repeat the process which i m getting once.What my method does is first one sends the packet to multicasting group (UDP) and other method receives the packets and prints.

Adding nicknames to chat program

Hi there,
I'm developing a chat program in java for school.
I already have the basics. I have a client, a server, and so on...
The communication had already been set right.
But now I want to let the client (user, who wants to chat) choose their nickname.
There cannot be 2 persons with the same nickname.
So I probably have to save those nicknames at the server.
How is the best way to approach this?
Just sending a nickname as a string is probably not a good way. Because the server had to make a difference between text (that has to be sent to every client) and other data (like a nickname).
I have no idea how to do this. How is this handled by other chat programs?
I hope someone can point me some ways to solve this.
Thanks in advance!

I see that you have every string that comes in as a message from that client.
What you should do is have the client type in his name before.
The string contains a special code to tell the server that it is a name. Such as: "<incomingnickname>ejito</incomingnickname>". When the server gets this information it will parse the nickname and send that name to respective database of current clients connected. It will then allow that person to speak and show up in the room.
The server checks whether names are already in use by looking through the database of clients.
If that name is currently taken, then the sever will send back a "<nicknamefailed> That nick is taken! Choose another</nicknamefailed>", and not allow the user to talk in the room until he gets a new name. The server will just trash all incoming messages from that client.
This is pretty secure. Since the server does the checking, and also prevents the user from speaking or appearing in the chat, it will prevent people from trying to duplicate the person's name.

Firewall burrowing/chat program help

I'm trying to develop a person-server-person chat program with java with the ability to burrow through firewalls. I'm using the example program from 1996 at: http://developer.java.sun.com/developer/technicalArticles/InnerWorkings/Burrowing/ as a guide.
I can get the applet up and running, but it won't connect to the server. The server says "Ready...", but neither connects to each other. They are both supposedly using port 6006.
When looking through the code of SimpleChatServer.java, I can't find where it designates an IP address, and can't figure out just how the applet is supposed to connect to the server.
Thanks everyone,
Mark

(Most if this code is from the example in the URL I first gave)
Here's the important code (trying 8080 this time):
Server:
int port = 8080;
     // Get the port number
     if (argv.length == 1)
     port = Integer.parseInt(argv[0]);
     // Create a server socket on the given port
     ServerSocket ss = null;
     try {
     ss = new ServerSocket(port);
     } catch (IOException e) {
     System.out.println("Could not listen on port: " +
port + ", " + e);
     System.exit(1);
     // Allocate a vector for all open connections to clients.
     Vector connections = new Vector();
     System.out.println("port: "+port+"Serversocket: "+ss);
     System.out.println("Ready...");
Output from DOS prompt is:
port: 8080Serversocket: ServerSocket[addr=0.0.0.0/0.0.0.0,port=0,localport=8080]
Ready...
From the Client/Applet side, run from IE 5:
String str = getParameter("port");
     int port = (str != null) ? Integer.parseInt(str) : 8080;
     connection = new ServerConnection(getCodeBase().getHost(),port);
System.out.println("connection: "+connection);
Output from java console:
connection: ServerConnection@de9ac4
Error getting a new connection to read from
I have no idea what ServerConnection@de9ac4 means (I know where it came from, just not what it means).
Thanks,
Mark

Java chat program, works on single PC, but not over internet?

I got bored so I started writing a chat client in java, its IRC style, a server and as many clients as you want. It works fine on a single computer (using 127.0.0.1 as the IP) but not over the internet.
I've tried running the server and client on my home PC, set up the ports to be forwarded on my router and enabled them in the windows firewall but I get the error "Connection refused" when trying to connect using my external IP (ISP) address, same with me running the server and a mate running the client.
The class chatHandler was basically stolen off the internet, the rest I wrote myself or modified bits of code to suit. I wrote it in netbeans with the GUI builder.
I've hosted both projects in the single zip, if you want to run the application just open the .jar file in the dist folders, or view the source via the src folder, or alternatively you can load the project up in NetBeans so its easier to play with the GUI.
So yeah if anyone can help me out with why its not working that'd be great, I've added the port to my firewall (default 60111). My ultimate goal is to implement an actual protocol so it isn't just sending plain text, then I can easily send files to mates etc.
http://rapidshare.com/files/208309140/ChatProgram.zip.html
Edited by: rolls on Mar 12, 2009 4:58 AM

what I have done recently is this:
have added java.exe, javaw.exe, the ports Im using to the windows firewall and also the ports I am using to my router.
I have also tried changing :
server = new ServerSocket(port);
to:
InetAddress IP = InetAddress.getByName(IPAddress);
server = new ServerSocket(port, backlog, IP);
(IPAddress = 192.168.1.3 my lan NIC)
As I believe it was binding to my local loopback adaptor, hence not seeing any packets when using a packet analyser, however now I get an exception, after printing a stacktrace from the client I get this.
However I can now connect using 192.168.1.3 just not using my external IP address.
java.net.ConnectException: Connection refused: connect
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.PlainSocketImpl.doConnect(PlainSocketImpl .java:333)
at java.net.PlainSocketImpl.connectToAddress(PlainSoc ketImpl.java:195)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.j ava:182)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.j ava:366)
at java.net.Socket.connect(Socket.java:519)
at java.net.Socket.connect(Socket.java:469)
at java.net.Socket.<init>(Socket.java:366)
at java.net.Socket.<init>(Socket.java:180)
at chatclient.Client.run(Client.java:60)
at java.lang.Thread.run(Thread.java:619)
Why is my connection getting refused? I've set up a virtual server and port forwarding on my router, and turned off the windows firewall.

How can I build Instalation Program for java applet?

I want to build on line internet game based on java applet.
Uset must instull the game to his computer.And this program mast Connect to the server when user enter
to this application.Not from explorer,but from my application,like when i enter to ICQ.
My questions:
How can i build instalation program in java?
How can i connect to the server when user enter into my game not from explorer but from game?
Thanks,Maya.

Hi Maya
First of all an Applet does not have to be "installed" as you would with a normal application. The browser handles the install and execution of the applet.
Check out this URL for more about applets:
http://web2.java.sun.com/docs/books/tutorial/applet/index.html
On the subject client/server pairs - see:
http://web2.java.sun.com/docs/books/tutorial/networking/sockets/index.html
If you decide to make the game an application instead check out Sun's WebStart - under the products section.
That's about all the help I can give you.
Programming a game is a complicated subject - I am doing one too:
http://hjem.get2net.dk/mhjembaek/armageddon/
Kind reg,
Hjembaek

Help wanted: Building jsp chat

Hi!
I am currently working on a school project where we're building a chat. We use jsp as server side programming language.
We store the messages in a MySQL database.
Now to the problem:
We want the message window to be updated everytime any user writes something eg. the user can see when someone writes something. We have thought of using the HTML meta tag "refresh", but there has to be a better way? Got any ideas?
Thanks
*j.ett5

Personally I am not sure that I would use JSP to build a chat application because JSP was not really meant for interactive user responses. If you are using JSP because the assignment requires JSP then I understand.
I would consider creating some sort of simple client-side applet that interacts with a serverside java app. This might require a little more work because you would have to work out some sort of simple protocol and pass the data over via a socket connection, but doesnt that sound like fun? :) The server side app could still query the DB but it would also be able to update client applets.
Seriously though, if you have to use JSP then I would agree that your best bet at refreshing entries would be to use the HTTP refresh meta tag. For best performance you will want to make sure that if no new entries to the DB have been added since the last refresh that you simply send a static version of the last page so that JSP doesnt have to build the page every time each clients web browser refreshes.

Voice chat program

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

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

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.

C:\Program Files\Java\jre7\bin

I have java installed on my sytem.but when i try to run sql developer it says j2se sdk not found in the path C:\Program Files\Java\jre7\bin
C:\Windows\system32>java -version
java version "1.7.0"
Java(TM) SE Runtime Environment (build 1.7.0-b147)
Java HotSpot(TM) 64-Bit Server VM (build 21.0-b17, mixed mode)
(code}
how should i get the path of j2se sdk

>
java version "1.7.0"
>
Don't use Java 1.7 with sql developer. There have been many problem reports (search the forum) and it is recommended that you use no later than a 1.6 Java version.

What is the best IDE for database programming in java?

im just new to java, i have experience in powerbuilder and visual basic. Im looking for an IDE for JAVA Database Programming that have same ease of use of the GUI builder of visual basic and power of the Datawindow in Powerbuilder.
What is the best IDE for database programming in java?

hey sabre why not just help me? instead of posting
annoying replies. You want me to browse all the post
two weeks ago to find what im looking for. stoopsMost regulars to this forum find X-posting annoying. Since you are lazy and want me to search the posts of the last couple of week for you, I find you very annoying.

Chat program in release 4.7c

hi guys,
I was wondering how one can create a chat program in abap. As its possible in Java & .Net why an abaper under estimate himself. Now here imagine a simple chat program where one can send some text from his SAP GUI which will appear on others SAP GUI and viceversa. Dont think about some messangers like yahoo or gtalk.(dont over estimate being an abaper)
So i developed two programs one to send text & other to receive text. Send prg. is module pool and receive prg. is a simple report which has timer class which gets data from table every second so user dont have to press any button to receive the message.
To start chat you have to run both programs in your GUI where from send program you enter your name in one text field and your message in other text field by pressing enter it gets update in table field(not every time it insert new record, it simply update previous so table size would not increase). As the person with whoem you are chatting is also running both programs, your message appears in 2nd program on his GUI & yours also. followed by your name.
Both chat programs works fine with more then two users also. i tried to combine both program in one screen so user can send & receive chat from one screen. but due to timer class used, its not possible as receive program keeps refreshing for every 1 second.
so i am wondering is thier any way to run one modulepool program & one report in a single screen. some thing like screen splitting or docking???
you are welcome to share your ideas regarding chat in ABAP/4(release 4.7)
Regards,
SUDHIR MANJAREKAR

Yes, thats right. There are few ABAP codes which you can find in the net and can improvise on that.
The program displays list of all users who are currently active on a list.
You can select user and select press button on the application tool bar to send a message.
Concerns here are: 1. The receiver cannot reply from the same popup. He has to run the program, select the user who has send message and reply. 2. You will not be able to see the entire message log.
For logging messages you can try creating standard text for tracking dialog between any two user and something of that sort.
regards,
S. Chandramouli.

Is it possible to create java standalone programs with java ME 8

Hi,
Comparing java ME to java SE, I have the impression that midlets are similar to applets.
When working with java SE, I usually make standalone programs.
Now, I wonder if it is also possible to create also standalone programs for java ME, if the classes are only using java ME API's.
I already noticed that netbeans does not allow to build a project that does not contain a midlet, but maybe, it is possible to create a jar file
using the javac and jar commands. Or is there a specific reason why netbeans does not allow to build a project without midlets?
The reason for asking is, that I often make small tools in java that ae then called from a linux script. I imagine that this might be useful on the raspberry pi as well.
Thanks in advance
Jef

Hi Jef -
Comparing java ME to java SE, I have the impression that midlets are similar to applets.
Sort of - similar life cycle methods - so conceptually, yes.
Now, I wonder if it is also possible to create also standalone programs for java ME, if the classes are only using java ME API's.
In a way, yes. If you build an project, you will notice a JAD file and JAR file in the dist directory of the project. JAD is the descriptor for a MIDlet - in mobile devices, the JAD
file is loaded first to determine if the MIDlet has enough privileges to load and run, before the corresponding JAR file is downloaded.
However, the JAD file can also be included in the Manifest of the JAR and the JAR copied to the embedded device manually and run there.
I already noticed that netbeans does not allow to build a project that does not contain a midlet, but maybe, it is possible to create a jar file
using the javac and jar commands. Or is there a specific reason why netbeans does not allow to build a project without midlets?
You can build JAR files and include them into Java ME Embedded projects, but just like Applets, to use the Application Management System (AMS) on the Raspberry Pi, you must have a MIDlet to run.
Perhaps you mean that you would like to launch the AMS and load a MIDlet from the command line on the Pi?
If so, take a look at this section of the Getting Started Guide for the Raspberry Pi.
Tom

Network chat program

I'm trying to make a chatting program for my home network, but I can't find one good tutorial on using java and networking. They all just show me how to make a server and client programs on my own machine. Big bunch a help that'll give me. Can someone help me?
I've searched everywhere.
Thanks!

Ah hell guys, if one of you is going to stand still and let the other run over, first, let me film it. Faces of Death needs a new movie! Second, let's use something better than a car for crying out loud! I'm thinking of a crane and ball, swing that sucker as fast as possible, or let's see if like in the cartoons, dropping a piano really does allow you to break through it, or if it would just flatten you. At least use a friggin' 18 wheeler or something so we can see body parts fly all over the place!

XI Mapping Programs Using Java

Hello all. This is my first posting, hopefully it's not a stupid question. Basically I'm having terrible problems trying to build a mapping program in NWDS. I can't seem to find the mapping jar file which contains the interface I need to implement in my java class. Actually, I'm not even sure which interface to implement, there's conflicting versions. I'm on the NW PI 7.1 version.
So far I've had someone look for aii_map_api.jar on the server which is supposed to contain a StreamTransormation interface which I can implement. That was not successful. I also tried looking on the sap marketplace for this jar file, but finding something out there is like finding a needle in a haystack. So no luck on that front.
After that I found another help article here : http://help.sap.com/saphelp_nwpi71/helpdata/EN/bd/c91241c738f423e10000000a155106/content.htm indicating that the jar files for mapping should already be installed in NWDS. Unfortunately my install does not have the SAP_XIAF folder. So now I'm stuck and I'm hoping someone here can point me in the right direction.
Do I need to get a different install of NWDS? If so what version?
Can I just download some jar files from the server or the marketplace? If so, which files?
Thanks very much,
Kevin

Kevin,
There are few options to get them. They already discussed in this thread:
aii_map_api.jar
http://wiki.sdn.sap.com/wiki/display/XI/Where%20to%20get%20the%20libraries%20for%20XI%20development
If you dont have the options to get these let me know ur id so that somebody can send them to you.
Regards,
---Satish

Building a chat program in java

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