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Server Side Application

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Server side application is used to get the message from any client and broadcast to each and every client. And this application is also used to maintain the list of users and broadcast this list to everyone.

Server Side Application

     

Server side application is used to get the message from any client and broadcast to each and every client. And this application is also used to maintain the list of users and broadcast this list to everyone.

The Server side application follows these steps

  • Firstly creates a new server socket by the ServerSocket ss = new ServerSocket(1004);
     
  • After creating the ServerSocket it accepts the client socket and add this socket into arraylist.
      Socket s = ss.accept();
      ArrayList al2 = new ArrayList();
      Al2.add(s);

      
  • After getting the client socket it creates a thread and make DataInputStream for this socket. After creating the input stream its read the user name and add it to arraylist and this arraylist object write in ObjectOutputStream of each client by using iterator. 
      DataInputStream din1=new DataInputStream(s.getInputStream)
      ArrayList alname=new ArrayList();
      alname.add(din1.readUTF());
      
      Iterator i1=al2.iterator();
      Socket st1; 
      while(i1.hasNext()){
      st1=(Socket)i1.next();
      dout1=new DataOutputStream(st1.getOutputStream());
      ObjectOutputStream obj=new ObjectOutputStream(dout1);
      obj.writeObject(alname);
      }

      
  • After this it makes a new thread and makes one DataInputStream for reading the messages which sends by the client and after reading the message its creates the DataOutputStream for each socket and writes this message in each client output stream through iterator.
      String str=din.readUTF();
      Iterator i=al.iterator();
      Socket st;
      while(i.hasNext()){
      st=(Socket)i.next();
      dout=new DataOutputStream(st.getOutputStream());
      dout.writeUTF(str);
      dout.flush();
      }

     
  • If any client Logged out then server received the client name and server remove it from the arraylist. And sends this updated arraylist to all client.
          sname=ddin.readUTF();
          alname.remove(sname);

Here is the code of the Server side application :

/****************************************************************
*  Version  :  1.0
*  Date     :  02/03/2007
*  
*  Description
*  This is a Server Side application of Chat System.
*  This application is used for receiving the messages from any client
*  and send to each and every client and in this we can maintain the
*  list of all online users.
*
*  Remarks
*  This application is unable to provide the private chatting facility
******************************************************************/

import java.io.*;
import java.net.*;
import java.util.*;

public class MyServer{
  ServerSocket ss;
  Socket s;
  ArrayList al=new ArrayList();
  ArrayList al1=new ArrayList();
  ArrayList al2=new ArrayList();
  ArrayList alname=new ArrayList();
  Socket s1,s2;
  MyServer()throws IOException{
  ss=new ServerSocket(1004);  // create server socket
  while(true){
  s=ss.accept();  //accept the client socket
  s1=ss.accept();
  s2=ss.accept();
  al.add(s);  // add the client socket in arraylist
  al1.add(s1);
  al2.add(s2);
  System.out.println("Client is Connected");
//new thread for maintaning the list of user name
  MyThread2 m=new MyThread2(s2,al2,alname) 
  
  Thread t2=new Thread(m);
  t2.start();
//new thread for receive
and sending the messages
  MyThread r=new MyThread(s,al);
  Thread t=new Thread(r);
  t.start();
  // new thread for
update the list of user name
  MyThread1 my=new MyThread1(s1,al1,s,s2) 
 
  Thread t1=new Thread(my);
  t1.start();
  }
  }
  public static void main(String[] args){
  try{
  new MyServer();  
  }catch (IOException e){}
  }
}
//class is used to update the list of user name
class MyThread1 implements Runnable{
  Socket s1,s,s2;
  static ArrayList al1;
  DataInputStream ddin;
  String sname;
  MyThread1(Socket s1,ArrayList al1,Socket s,Socket s2){
  this.s1=s1;
  this.al1=al1;
  this.s=s;
  this.s2=s2;
  }
  public void run(){  
  try{
  ddin=new DataInputStream(s1.getInputStream());
  while(true){
  sname=ddin.readUTF();
  System.out.println("Exit  :"+sname);
//remove the logout user
name from arraylist
  MyThread2.alname.remove(sname);
 
  MyThread2.every();
  al1.remove(s1);
  MyThread.al.remove(s);
  MyThread2.al2.remove(s2);
  if(al1.isEmpty())
  System.exit(0)//all client has been logout
  }
  }catch(Exception ie){}
  }
}

// class is used to maintain the list of all online users
class MyThread2 implements Runnable{
  Socket s2;
  static ArrayList al2;
  static ArrayList alname;
  static DataInputStream din1;  
  static DataOutputStream dout1;

  MyThread2(Socket s2,ArrayList al2,ArrayList alname){
  this.s2=s2;
  this.al2=al2;
  this.alname=alname;
  }
  public void run(){
  try{
  din1= new DataInputStream(s2.getInputStream());
// store the user name in arraylist
  alname.add(din1.readUTF());
  every();
  }catch(Exception oe){}
  }
  // send the list of user name to all client
  static void every()throws Exception{
  Iterator i1=al2.iterator();
  Socket st1;  

  while(i1.hasNext()){
  st1=(Socket)i1.next();
  dout1=new DataOutputStream(st1.getOutputStream());
  ObjectOutputStream obj=new ObjectOutputStream(dout1);
//write the list of users
in stream of all clients
  obj.writeObject(alname)
  dout1.flush();
  obj.flush();
  }
  }
}
//class is used to receive the message and 
//send it to all clients
class MyThread implements Runnable{
  Socket s;
  static ArrayList al;
  DataInputStream din;
  DataOutputStream dout;

  MyThread(Socket s, ArrayList al){
  this.s=s;
  this.al=al;
  }
  public void run(){
  String str;
  int i=1;
  try{
  din=new DataInputStream(s.getInputStream());
  }catch(Exception e){}
  
  while(i==1){
  try{
  
  str=din.readUTF()//read the message
  distribute(str);
  }catch (IOException e){}
  }
  }
  // send it to all clients
  public void distribute(String str)throws IOException{
  Iterator i=al.iterator();
  Socket st;
  while(i.hasNext()){
  st=(Socket)i.next();
  dout=new DataOutputStream(st.getOutputStream());
  dout.writeUTF(str);
  dout.flush();
  }
  }
}

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Posted on: March 28, 2008

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