java 网络编程-UDP-双人交互

Posted 2022-08-29

发送端

public class my implements Runnable 
private DatagramSocket client ;
private BufferedReader reader;
private String toip; //对方的ip
private int toport; //对方的端口
public my(int port,String toip,int toport)

    try 
        client=new DatagramSocket(port);
        reader=new BufferedReader(new InputStreamReader(System.in));
        this.toip=toip;
        this.toport=toport;
     catch (SocketException e) 
        e.printStackTrace();
    

public void run()

    while(true)
    
        String s;
        try 
            s = reader.readLine();

            byte[] datas=s.getBytes();

            DatagramPacket packet=new DatagramPacket(datas,0,datas.length,new InetSocketAddress(this.toip,this.toport));

            client.send(packet);
            if(s.equals("bye"))
            
                break;
            
         catch (IOException e) 

            e.printStackTrace();
        

    
    client.close();

接收端：使用面向对象封装

public class you implements Runnable

private DatagramSocket server;
private int port;
private String from;
public you(int port,String from)

    this.port=port;
    this.from=from;
    try 
        server=new DatagramSocket(port);
     catch (SocketException e) 
        e.printStackTrace();
    

public void run()

    while(true)
    
        byte[] container=new byte[1024*60];

        DatagramPacket packet=new DatagramPacket(container,0,container.length);

        try 
            server.receive(packet);

            byte[] datas=packet.getData();
            int len=packet.getLength();

            String data=new String(datas,0,datas.length);
            System.out.println(from+":"+data);

            if(data.equals("bye"))
            
                break;
            
         catch (IOException e) 

            e.printStackTrace();
        
    
    server.close();

加入多线程实现双向交流

public class student 

public static void main(String[]args)

    new Thread(new my(9999,"localhost",8888)).start();//发送

    new Thread(new you(7777,"teacher")).start(); //接收



public class teacher 

public static void main(String[]args)

    new Thread(new you(8888,"student")).start();//接收

    new Thread(new my(5555,"localhost",7777) ).start();//发送