java udp简单例子

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package com.justsee.tcpip;import java.io.IOException;import java.net.DatagramPacket;import java.net.DatagramSocket;import java.net.SocketException;public class UdpRecv {//先启动这个类，等待接受信息。public static void main(String[] args) throws IOException {System.out.println("等待接受");DatagramSocket datagramSocket = new DatagramSocket(8080);//指定接受信息的端口byte[] buf = new byte[1024];//指定最大接受信息的大小DatagramPacket datagramPacket = new DatagramPacket(buf, 1024);datagramSocket.receive(datagramPacket);//阻塞等待String string = new String(datagramPacket.getData(), 0,datagramPacket.getLength())+ "  from  "+ datagramPacket.getAddress().getHostAddress()+ ":" + datagramPacket.getPort();System.out.println(string);datagramSocket.close();}}

package com.justsee.tcpip;import java.io.IOException;import java.net.DatagramPacket;import java.net.DatagramSocket;import java.net.InetAddress;import java.net.SocketException;import java.net.UnknownHostException;public class UdpSend {//后启动发送类。public static void main(String[] args) throws IOException {System.out.println("发送");DatagramSocket datagramSocket = new DatagramSocket();String str = "我是中国人！";//因为是发送的中文，所以str.length()改为str.getBytes().length。//指定发送到的ip和端口DatagramPacket datagramPacket = new DatagramPacket(str.getBytes(),str.getBytes().length, InetAddress.getByName("172.30.31.53"),8080);datagramSocket.send(datagramPacket);datagramSocket.close();}}/*发送和接受都是以DatagramSocket为信息载体*/

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