Client Sockets

Question

I want to identify clients.Suppose there are 2 clients and the server wants to identify these two clients how will the server identify them? is there any method to identify the clients?

Answer 1

p
public static class ConnectionHandler1 extends Thread implements Map
Socket conn=new Socket() ;
int idcon=0 ;
Map<Integer,socket> ;
ConnectionHandler(Socket socket,int id)
conn=socket ;
idcon=id ;
sockets=new HashMap<Integer,Socket>();
public void run()
try
System.out.println("Detected client ");
InputStream sin = conn.getInputStream();
OutputStream sout = conn.getOutputStream();
DataInputStream in = new DataInputStream(sin);
DataOutputStream out = new DataOutputStream(sout);
String username = in.readUTF(); // wait for the client to send a line of text.
System.out.println("Reading the username : " + username);
System.out.println("conn : " + conn);
System.out.println("idcon: " + idcon);
/* out.writeUTF("hi!!!!!");
out.writeUTF("I have Detected you!!!!");*/
System.out.println("this is sockets"+sockets) ;
sockets.put(idcon, conn) ;
System.out.println("After sockets put") ;
System.out.println(conn=sockets.get(idcon)) ;
}//try
catch(Exception e)
System.out.println(e) ;
it gives me Null pointer Exception.
Edited by: s_coder on Feb 24, 2009 4:42 AM