package cn.a.qwe;

import java.net.DatagramPacket;

import java.net.DatagramSocket;

import java.net.SocketException;

public class Server {

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

		DatagramSocket sockets=new DatagramSocket(50000);

		byte[] bytes = new byte[1024];

		DatagramPacket packet = new DatagramPacket(bytes, 0,bytes.length);

		sockets.receive(packet);

		byte[] data = packet.getData();

		String temp = new String(data,0,data.length);

		System.out.println(temp);

	}

}

package cn.a.qwe;

import java.net.DatagramPacket;

import java.net.DatagramSocket;

import java.net.InetAddress;

import java.net.SocketException;

public class Client {

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

		String word="开启成功";

		byte[] bytes=word.getBytes();

		DatagramSocket client = new DatagramSocket();

		DatagramPacket packet = new DatagramPacket(bytes, 0, bytes.length, InetAddress.getByName("localhost"), 50000);

		client.send(packet);

	}

}