How A ,B and S communicate in java in Socket programming?

Question

How client A send message to Client B and B send Message to Server S.And also how communication takes place between A and B?I have tried and solved problem for two party ie single client and single server. I have tried in the following way

//Server
public class DateServer {

    public static void main(String[] args) throws IOException {
        ServerSocket listener = new ServerSocket(9090);
        try {
            while (true) {
                Socket socket = listener.accept();
                System.out.println("Waiting for client on port " +
                    listener.getLocalPort() + "...");

                try {
                    PrintWriter out =
                        new PrintWriter(socket.getOutputStream(), true);
                    out.println(new Date().toString());
                } finally {
                    socket.close();
                }
            }
        } finally {
            listener.close();
        }
    }
}

//Client
public class DateClient {
    public static void main(String[] args) throws IOException {
        String serverAddress = JOptionPane.showInputDialog(
            "Enter IP Address of a machine that is\n" +
            "running the date service on port 9090:");
        Socket s = new Socket(serverAddress, 9090);
        BufferedReader input =
            new BufferedReader(new InputStreamReader(s.getInputStream()));
        String answer = input.readLine();
        JOptionPane.showMessageDialog(null, answer);
        //System.exit(0);
        System.out.println(answer);
    }
}

How communication takes palce between client in java socket programming . But i am not getting idea how communication takes place between A , B and SI have tried too much but not succeeded.I waiting for best answer

Answer 1

Use the MultiThreading concept. You can create two threads in server for accepting the incoming connections from A and B. you need to open two ports in server for clients A and B.

Answer 2

The architecture depends on your need. If you want to establish a connection from X to Y, then Y needs to have a listening port. Thus B needs to listen for incoming connections. Just like S. S needs to listen for incoming traffic as well

Note that this is just one case. The architecture would depend on your requirements.