Java chat programs

Question

hi..am looking for sample java programs where a server can communicate to multiple clients and viseversa....could anyone by any chance have done similar programs or knows a link to such programs?
thanks
ps:i already checked in the forum and found a number of incomplete codes..so i'm looking for something complete.

Answer 1

It doesn't follow any naming convention as i wrote it a long time back when ( I didn't know what coding conventions were then). However it will give you a basic idea
The server code
     import java.io.*;
     import java.net.*;
     class kserverreceive implements Runnable
          Socket client1;
          BufferedReader in;
          String fromuser;
          Thread t;
          kserverreceive(Socket client1,BufferedReader in)
               this.client1=client1;
               this.in=in;
               t=new Thread(this);
               t.start();
          public void run()
               try
                    while((fromuser=in.readLine())!=null)
                         System.out.println(fromuser);
               catch(IOException e)
                    System.out.println("IOException encountered");
          //System.out.println("client has disconnected");
     class kserversend implements Runnable
          Socket client2;
          BufferedReader stdIN=new BufferedReader(new InputStreamReader(System.in));
          PrintWriter out;
          String touser;
          Thread t;
          kserversend(Socket client2,PrintWriter out)
               this.client2=client2;
               this.out=out;
               t=new Thread(this);
               t.start();
          public void run()
               try
                    while((touser=stdIN.readLine())!=null)
                         out.println(touser);
               catch(IOException e)
                    System.out.println("IOException encountered");
          //System.out.println("the client has disconneceted");
     public class kserver
          public static void main(String args[]) throws IOException
               ServerSocket server=null;
               Socket client=null;
               BufferedReader in;
               PrintWriter out;
               kserverreceive client1;
               kserversend client2;
               try
                    server=new ServerSocket(7777);
               catch(IOException e)
                    System.out.println("couldnt listen on port 7777");
                    System.exit(1);
               try
                    while(true)
                         client=server.accept();
                         in=new BufferedReader(new InputStreamReader(client.getInputStream()));
                         out=new PrintWriter(client.getOutputStream(),true);
                         System.out.println("connection established");
                         client2=new kserversend(client,out);
                         client1=new kserverreceive(client,in);                    
               catch(Exception e)
                    System.out.println("accept failed:"+e);
                    System.exit(1);
               //This is if you want to accept only a single client request
               /*String outline;
               BufferedReader inread=new BufferedReader(new InputStreamReader(client.getInputStream()));
               while((outline=inread.readLine())!=null)
                    System.out.println(outline);
//               inread.close();
               client.close();
               server.close();
          The client code
     import java.io.*;
     import java.net.*;
     class kclientsend implements Runnable
          Socket client1;
          PrintWriter out;
          Thread t;
          String touser;
          BufferedReader stdIN=new BufferedReader(new InputStreamReader(System.in));
          kclientsend(Socket client1,PrintWriter out)
               this.client1=client1;
               this.out=out;
               t=new Thread(this);
               t.start();
          public void run()
               try
                    while((touser=stdIN.readLine())!=null)
                         out.println(touser);
               catch(IOException e)
                    System.out.println("IOException encountered");
          //System.out.println("The client has disconnected");
     class kclientreceive implements Runnable
          Socket client2;
          BufferedReader in;
          String fromuser;
          Thread t;          
          kclientreceive(Socket client2,BufferedReader in)
               this.in=in;
               this.client2=client2;               
               t=new Thread(this);
               t.start();
          public void run()
               try
                    while((fromuser=in.readLine())!=null)
                         System.out.println("["+client2.getInetAddress().toString()+"]::"+client2.getInetAddress().getHostName()+"::"+fromuser);
               catch(IOException e)
                    System.out.println("IOException encountered");
          //System.out.println("The client has disconnected");
     public class kclient
          public static void main(String args[]) throws Exception
               Socket client=null;
               PrintWriter out=null;
               BufferedReader in=null;
               kclientsend client1;
               kclientreceive client2=null;
               try
                    client=new Socket("NAMI",7777);
                    out=new PrintWriter(client.getOutputStream(),true);
                    in=new BufferedReader(new InputStreamReader(client.getInputStream()));
                    System.out.println("connection established successfully");
                    client1=new kclientsend(client,out);
                    client2=new kclientreceive(client,in);
               catch(UnknownHostException e)
                    System.out.println("NAMI not found"+e);
                    System.exit(1);
               catch(IOException e)
                    System.out.println("couldnt get IO for NAMI"+e);
                    System.exit(1);
               /*String fromuser;
               BufferedReader stdIN=new BufferedReader(new InputStreamReader(System.in));
               while((fromuser=stdIN.readLine())!=null)
                    out.println(fromuser);
               Thread.sleep(100000);
               out.close();
               // stdIN.close();
               client.close();
               Message was edited by:
qUesT_foR_knOwLeDge