UDPServer.java

package com.learn;import java.io.IOException; import java.net.DatagramPacket; import java.net.DatagramSocket; import java.net.InetAddress; import java.net.SocketException;/** 實(shí)現(xiàn)基于UDP的用戶登錄*/ public class UDPServer {public static void main(String[] args) {try {/** 接收客戶端發(fā)送的數(shù)據(jù)*/// 1.創(chuàng)建服務(wù)器端 datagramsocketDatagramSocket server = new DatagramSocket(8888);// 2.創(chuàng)建數(shù)據(jù)報(bào)，用于接收客戶端發(fā)送的數(shù)據(jù)byte[] bytes = new byte[1024];DatagramPacket packet = new DatagramPacket(bytes, bytes.length);// 3.接收客戶端發(fā)送的數(shù)據(jù)System.out.println("***服務(wù)器端已啟動(dòng)，等待客戶端上線***");server.receive(packet);// 此方法會(huì)在接收到數(shù)據(jù)之前一直阻塞// 4.讀取數(shù)據(jù)String info = new String(bytes, 0, packet.getLength());System.out.println("我是服務(wù)器，客戶端發(fā)來(lái)數(shù)據(jù)說(shuō)：" + info);/** 響應(yīng)客戶端發(fā)來(lái)的消息*/// 1.定義客戶端的地址，端口號(hào)，數(shù)據(jù)InetAddress address = packet.getAddress();int port = packet.getPort();byte[] data = "歡迎上線".getBytes();// 2.創(chuàng)建數(shù)據(jù)報(bào)，包含響應(yīng)的數(shù)據(jù)信息packet = new DatagramPacket(data, data.length, address, port);// 3.響應(yīng)客戶端，發(fā)送數(shù)據(jù)server.send(packet);// 關(guān)閉資源server.close();} catch (SocketException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}} }

UDPClient.java

package com.learn;import java.net.DatagramPacket; import java.net.DatagramSocket; import java.net.InetAddress;/** 客戶端*/ public class UDPClient {public static void main(String[] args) throws Exception {/** 向服務(wù)器端發(fā)送數(shù)據(jù)*/// 1.定義服務(wù)器的地址，端口號(hào)，數(shù)據(jù)InetAddress address = InetAddress.getByName("192.168.6.184");int port = 8888;byte[] data = "用戶名：admin;密碼：123".getBytes();// 2.創(chuàng)建數(shù)據(jù)報(bào)，包含了發(fā)送的信息DatagramPacket packet = new DatagramPacket(data, data.length, address, port);// 3.創(chuàng)建 DatagramSocketDatagramSocket client = new DatagramSocket();// 4.向服務(wù)器端發(fā)送數(shù)據(jù)client.send(packet);/** 接受服務(wù)器端響應(yīng)的數(shù)據(jù)*/// 1.創(chuàng)建數(shù)據(jù)報(bào)，用于接受服務(wù)端響應(yīng)的數(shù)據(jù)byte[] bytes = new byte[1024];packet = new DatagramPacket(bytes, bytes.length);// 2.接收服務(wù)器響應(yīng)的數(shù)據(jù)client.receive(packet);// 3.讀取數(shù)據(jù)String reply = new String(bytes, 0, packet.getLength());System.out.println("我是客戶端，服務(wù)器發(fā)來(lái)消息說(shuō)：" + reply);// 關(guān)閉資源client.close();} }

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