CLIENT :

import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.net.SocketException;
import java.net.UnknownHostException;
import java.io.IOException;

public class Rfc865UdpClient {
    public static void main(String[] argv) throws UnknownHostException, SocketException {
        //
        // 1. Open UDP socket
        //
        DatagramSocket socket = null;
        try {
            socket = new DatagramSocket();
        } catch (SocketException e) {}
        InetAddress address = InetAddress.getByName("127.0.0.1");
        byte[] buffer = new byte[512];

        try {
            //
            // 2. Send UDP request to server
            //
            String msg = new String("Your name, Lab Group, YourClientIPAddress");
            buffer = msg.getBytes();
            DatagramPacket request = new DatagramPacket(buffer, buffer.length, address, 17);
            socket.send(request);

            //
            // 3. Receive UDP reply from server
            //
            buffer = new byte[512];
            DatagramPacket reply = new DatagramPacket(buffer, buffer.length);
            socket.receive(reply);
            String quote = new String(reply.getData(),0,reply.getLength());
            System.out.println(quote);
            socket.close();
        } catch (IOException e) {}
    }
}


SERVER :

import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.net.SocketException;
import java.io.IOException;

public class Rfc865UdpServer {
    public static void main(String[] argv) {
        //
        // 1. Open UDP socket at well-known port
        //
        DatagramSocket socket = null;
        byte[] buffer = new byte[512];

        try {
            socket = new DatagramSocket(17);
        } catch (SocketException e) {}

        while (true) {
            try {
                //
                // 2. Listen for UDP request from client
                //
                DatagramPacket request = new DatagramPacket(buffer, buffer.length);
                socket.receive(request);
                String received = new String(request.getData(), 0, request.getLength());
				System.out.println(received);
                InetAddress address = request.getAddress();
                int port = request.getPort();

                //
                // 3. Send UDP reply to client
                //
                String replyMessage = new String("This is a quote.");
                buffer = replyMessage.getBytes();
                DatagramPacket reply = new DatagramPacket(buffer,buffer.length,address,port);
                socket.send(reply);
            } catch (IOException e) {}
        }
    }
}