import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStreamReader;

import java.net.DatagramPacket;

import java.net.DatagramSocket;

import java.net.InetAddress;

import java.net.SocketException;

public class UDPSendDemo

{

    /**

     * @param args

     */

    public static void main(String[] args)

    {

        DatagramSocket ds = null;

        try

        {

            ds = new DatagramSocket();

                BufferedReader br = new BufferedReader(new InputStreamReader(

                        System.in));

                String line = null;

                try

                {

                    while ((line = br.readLine()) != null)

                    {

                        byte[] buf = line.getBytes();

                        if (line.equals("quit"))

                            break;

                        DatagramPacket dp = new DatagramPacket(buf, buf.length,

                                InetAddress.getByName("192.168.0.101"), 8638);

                        ds.send(dp);

                    }

                    ds.close();

                } catch (IOException e)

                {

                    e.printStackTrace();

                }

        } catch (SocketException e)

        {

            e.printStackTrace();

        }

    }

}

import java.io.IOException;

import java.net.DatagramPacket;

import java.net.DatagramSocket;

import java.net.SocketException;

public class UDPReceiveDemo

{

    public static void main(String[] args)

    {

        try

        {

            DatagramSocket ds = new DatagramSocket(8638);

            while (true)

            {

                byte[] buf = new byte[1024];

                DatagramPacket dp = new DatagramPacket(buf, buf.length);

                try

                {

                    ds.receive(dp);

                    String ip = dp.getAddress().getHostAddress();

                    String data = new String(dp.getData(), 0, dp.getLength());

                    System.out.println(ip + ":: " + data);

                } catch (IOException e)

                {

                    e.printStackTrace();

                }

            }

        } catch (SocketException e)

        {

            e.printStackTrace();

        }

    }

}