package 第十二章;

import java.io.IOException;

import java.net.*;

public class UDPServer {

	/***

	 *

	 * @param args

	 * @throws IOException

	 */

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

		// TODO Auto-generated method stub

		System.out.println("服务器开启成功");

		DatagramSocket socket=new DatagramSocket(55555);

		while(true){

			byte[]b=new byte[1024];

//			UDP以数据包的形式发送

			DatagramPacket packet=new DatagramPacket(b,b.length);

			socket.receive(packet);

			String s=new String(packet.getData(),0,packet.getLength());

//			获得到发送端的IP

			String ip=packet.getAddress().toString();

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

		}

	}

}

//客户端

ackage 第十二章;

import java.io.IOException;

import java.net.DatagramPacket;

import java.net.DatagramSocket;

import java.net.InetAddress;

import java.net.Socket;

import java.net.SocketException;

import java.net.UnknownHostException;

import java.util.Scanner;

public class UDPClient {

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

		// TODO Auto-generated method stub

		while(true){

			Scanner scan=new Scanner(System.in);

			System.out.println("请输入要发送的数据");

			String str =new String();

			str=scan.nextLine();

			byte[]b=str.getBytes();

//			服务器端的IP地址

			InetAddress serverAddress=InetAddress.getByName("192.168.1.179");

//			参数列表：字节数组，数组的长度，服务器的IP地址，服务器的端口号

			DatagramPacket packet=new DatagramPacket(b,b.length,serverAddress,55555);

//			DatagramSocket可以将这个数据包发送到服务器

			DatagramSocket socket=new DatagramSocket();

			socket.send(packet);

		}

	}

}