Hi,

I'm trying to write a chat program. I have no problem connecting multiple
clients to the chat server and sending/receiving messages from/to individual
clients. The part I don't understand is how to get the server to send a
message it receives from one client to all connected clients. Here's the
relevant class:

===================================
class ChatServer extends Thread {
private Socket socket;
private BufferedReader input;
private PrintWriter output;

public ChatServer(Socket s) throws IOException {
 socket = s;
 input = new BufferedReader(new
InputStreamReader(socket.getInputStream()));
 output = new PrintWriter(new BufferedWriter(new OutputStreamWriter(
   socket.getOutputStream())), true);
 start();
}

public void run() {
 try {
  while (true) {
   String str = input.readLine();
   if (str.equals("QUIT"))
    break;
   System.out.println("From client: " + str);
   output.println("From server: " + str); // Send back to client(s)
  }
  System.out.println("Quitting.");
 }
 catch(IOException e) {
  System.err.println("IO Exception");
 }
 finally {
  try {
   socket.close();
  }
  catch(IOException e) {
   System.err.println("Socket not closed!");
  }
 }
}
}
=================================

The client code simply reads whatever the server sends it, so I won't waste
space and post it.

I realize the output is being sent via a given socket to a given client. I
just don't understand how to send that input to all connected clients. Any
pointers are greatly appreciated.

Thanks.