package com.net.core;import java.io.IOException;import java.net.DatagramPacket;import java.net.DatagramSocket;import java.net.InetSocketAddress;/** * Udp 基本演示 * Created by mengfei on 2018/3/1 0001. */public class Udp {}/** * 服务端 */class Server {    public static void main(String args[]) throws IOException {        DatagramSocket server = new DatagramSocket(8888);        byte[] data = new byte[1024];        DatagramPacket packet = new DatagramPacket(data,data.length);        server.receive(packet);        byte[] recData =  packet.getData();        System.err.println(new String(recData));        server.close();    }}/** * 客户端 */class Client {    public static void main(String args[]) throws IOException {        DatagramSocket client = new DatagramSocket();        String sendData = "client send a msg!";        byte[] data =sendData.getBytes();        DatagramPacket packet = new DatagramPacket(data,data.length,new InetSocketAddress("localhost",8888));        client.send(packet);        client.close();    }}