import java.io.IOException;

import java.net.DatagramPacket;

import java.net.DatagramSocket;

import java.net.InetAddress;

import java.util.Scanner;



public class UdpSender {

    public static void main(String[] args) throws IOException {

        DatagramSocket ds = new DatagramSocket(8888);

        Scanner scanner = new Scanner(System.in);

        System.out.println("输入要发送的信息:");

        while(true){

            String msg = scanner.nextLine();

            byte[] buf = msg.getBytes();

            

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

                    InetAddress.getByName("localhost"), 10000);

            ds.send(dp);

            System.out.printf("%s sent!", msg);

            if("quit".equalsIgnoreCase(msg))

                break;            

        }

        ds.close();

    }

}

import java.io.IOException;

import java.net.DatagramPacket;

import java.net.DatagramSocket;



public class UdpReceiver {



    public static void main(String[] args) throws IOException {

        DatagramSocket ds = new DatagramSocket(10000);

        byte[] buf = new byte[1024];

        

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

        

        String data = null;

        while(!"quit".equalsIgnoreCase(data)){

            ds.receive(dp);

            

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

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

            

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

        }

        System.out.println("byebye");

        ds.close();

    }

}