协议编程

来源：互联网发布：移动数据被自动关闭编辑：程序博客网时间：2024/06/08 09:40

1.使用UDP协议编写一个网络程序，设置接收端程序的监听端口是8001，发送端发送的数据是“Hello,world”。

import java.net.*;public class ClientUdp {public static void main(String[] args) throws Exception{// TODO Auto-generated method stubbyte buf[]=new byte[1024];DatagramSocket ds=new DatagramSocket(8001);DatagramPacket dp=new DatagramPacket(buf,1024);System.out.println("等待接收数据");ds.receive(dp);String str=new String(dp.getData(),0,dp.getLength())+" from "+dp.getAddress().getHostAddress()+":"+dp.getPort();System.out.println(str);ds.close();}}import java.net.*;public class ServerUdp {public static void main(String[] args)throws Exception {DatagramSocket ds=new DatagramSocket(3003);// TODO Auto-generated method stubString str="hello world";DatagramPacket dp=new DatagramPacket(str.getBytes(),str.length(),InetAddress.getByName("localhost"),8001);System.out.println("发送信息");ds.send(dp);ds.close();}}

2.使用TCP协议编写一个网络程序，设置服务器端的监听端口是8002，当与客户端建立连接后，服务器端向客户端发送数据“Hello,world”，客户端收到数据后打印输出。

import java.io.*;import java.net.*;public class ClientTcp {public static void main(String[] args)throws Exception {// TODO Auto-generated method stubnew TcpClient().connect();}}class TcpClient{private static final int port=8002;public void connect()throws Exception{Socket client=new Socket(InetAddress.getLocalHost(),port);InputStream is=client.getInputStream();byte buf[]=new byte[1024];int len=is.read(buf);System.out.println(new String(buf,0,len));client.close();}}import java.io.*;import java.net.*;public class ServerTcp{public static void main(String[] args)throws Exception {// TODO Auto-generated method stubnew TcpServer().listen();}}class TcpServer{private static final int port=8002;public void listen()throws Exception{ServerSocket serverSocket=new ServerSocket(port);Socket client=serverSocket.accept();OutputStream os=client.getOutputStream();System.out.println("开始向客户端交互数据");os.write(("hello world").getBytes());Thread.sleep(9000);System.out.println("结束与客户端交互数据");        os.close();client.close();}}

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