java网络编程

import java.io.*; import java.net.*; public class UDPServer{ public static void main(String[] args)throws IOException{ //初始化数据包 DatagramSocket datagramSocketServer = new DatagramSocket(5050); byte[] bytes = new byte[1024]; //接收客户端数据包 DatagramPacket receivePackage = new DatagramPacket(bytes , bytes.length); datagramSocketServer.receive(receivePackage); //读取数据包内容 String receiveStr = new String(receivePackage.getData() , 0 , receivePackage.getLength()); System.out.println("Client　Say __:" + receiveStr); int port = receivePackage.getPort(); InetAddress inetAddress = receivePackage.getAddress(); String sendStr = "Server Say___: Copy that give you ResonseInfo...."; byte[] sendBytes = sendStr.getBytes(); DatagramPacket sendPacket = new DatagramPacket(sendBytes , sendBytes.length , inetAddress , port ); datagramSocketServer.send(sendPacket); datagramSocketServer.close(); } }

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客户端

 

import java.io.*; import java.net.*; /** * @author God */ public class UDPClient{ public static void main(String[] args)throws IOException{ DatagramSocket datagramSocketClient = new DatagramSocket(); String sendStr = "Hello! I'm Client"; byte[] sendBytes = sendStr.getBytes(); InetAddress inetAddress = InetAddress.getByName("127.0.0.1"); DatagramPacket sendPacket = new DatagramPacket(sendBytes ,sendBytes.length , inetAddress , 3000); datagramSocketClient.send(sendPacket); byte[] receiveBytes = new byte[100]; DatagramPacket recvPacket = new DatagramPacket(receiveBytes , receiveBytes.length); datagramSocketClient.receive(recvPacket); String receiveStr = new String(recvPacket.getData() , 0 ,recvPacket.getLength()); System.out.println("我是客户端收到你的信息____:"+receiveStr); datagramSocketClient.close(); } }