fun.

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

public class EchoServer {
    private ServerSocket server;

    public EchoServer(int portnum) {
        try {
            server = new ServerSocket(portnum);
        } catch (Exception err) {
            System.out.println(err);
        }
    }

    public void serve() {
        try {
            while (true) {
                Socket client = server.accept();
                BufferedReader r = new BufferedReader(new InputStreamReader(client.getInputStream()));
                PrintWriter w = new PrintWriter(client.getOutputStream(), true);
                w.println("Welcome to the Java EchoServer. Type 'bye' to close");
                String line;
                do {
                    line = r.readLine();
                    if (line != null) {
                        w.println("Got: " + line);
                        System.out.println(line);
                    }
                } while (!line.trim().equals("bye"));
                client.close();
            }
        } catch (Exception err) {
            System.err.println(err);
        }
    }

    public static void main(String[] args) {
        EchoServer s = new EchoServer(9999);
        s.serve();
    }
}



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

public class EchoClient {
    public static void main(String[] args) {
        try {
            Socket s = new Socket("127.0.0.1", 9999);
            BufferedReader r = new BufferedReader(new InputStreamReader(s.getInputStream()));
            PrintWriter w = new PrintWriter(s.getOutputStream(), true);
            BufferedReader con = new BufferedReader(new InputStreamReader(System.in));
            String line;
            do {
                line = con.readLine();
                w.println(line);
                if (!line.trim().equals("bye")) {
                    line = r.readLine();
                    if (line != null)
                        System.out.println(line);
                }
            } while (!line.trim().equals("bye"));
        } catch (Exception err) {
            System.err.println(err);
        }
    }
}


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