基于UDP的Socket网络编程实现用户登录的实现

package Test_UDP_Socket;

import java.net.DatagramPacket、*
//服务器端
import java.net.DatagramSocket;
import java.net.InetAddress;

public class ServerUDP {
	public static void main(String[] args) throws Exception{
		//1.先实现接收Client信息
		DatagramSocket socketServer= new DatagramSocket(9090);
		byte[] data=new byte[1024];
		DatagramPacket packetClient=new DatagramPacket(data,data.length);
		socketServer.receive(packetClient);
		//String infoClient=new String(data,0,packetClient.getLength());
		System.out.println("[SERVER]Server IP Address:"+InetAddress.getLocalHost());
		System.out.println("[SERVER]Information from Client:\n"+(new String(data,0,packetClient.getLength())));

		//2.然后实现Server给Client的一个响应信息；应该包括(端口号；IP地址；还有一个响应请求数据)
		byte[] dataServer="[SERVER]:Welcome!".getBytes();
		DatagramPacket packetServer;
		packetServer=new DatagramPacket(dataServer,dataServer.length,packetClient.getAddress(),packetClient.getPort());
		DatagramSocket socketClient=new DatagramSocket();
		socketServer.send(packetServer);

		//3.关闭资源：
		socketServer.close();

	}
}

//客户端我们也这样写

package Test_UDP_Socket;

import java.io.IOException;

import java.net.DatagramPacket;

import java.net.DatagramSocket;

import java.net.InetAddress;

public class ClientUDP {

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

//1.实现给Client端给服务器发送登录请求信息

byte[] dataClient="[CLIENT]:UserName:WXM PassWord:123".getBytes();

DatagramPacket packetClient=new DatagramPacket

(dataClient,dataClient.length,InetAddress.getByName("localhost"),9090);

DatagramSocket socketClient=new DatagramSocket();

socketClient.send(packetClient);

//2.实现接收Server端的响应信息

byte[] dataServer=new byte[1024];

DatagramPacket packetServer;

packetServer=new DatagramPacket(dataServer,dataServer.length);

socketClient.receive(packetServer);

//String infoServer=new String(dataServer,0,packetServer.getLength());

System.out.println("[CLIENT]:Information from Server:\n"+

(new String(dataServer,0,packetServer.getLength())));

//3.关闭资源

socketClient.close();

}

}

/*

基于UDP的SOCKET网络编程主要需要写两个模块

1. 客户端请求和服务器响应的发送
2. 关闭资源