Udp 多线程通信 练习

最近在看Udp通信的知识，仿照前几次TCP多线程的练习编写一个基于UDP的多线程通信

练习中分别指定两个端口的端口号

其中一个端口的程序如下：

import java.net.*;
import java.io.*;

public class Port_one{
    public static void main(String[] args) throws Exception{
        //use the multi-thread . 
        //one thread response for sneding message ,in this field you should use the System.in as the inputStream
        //the other response for receiveing the message
        DatagramSocket socket = new DatagramSocket(7000);//指定端口号，用于别的端口向这里发送信息用
        new Thread(new receiveMess(socket)).start();//起线程接收信息
        new Thread(new sendMess(socket)).start();//起线程发送信息
        
        
        
    }
}

class receiveMess implements Runnable{  //收信息线程
    DatagramSocket socket;
    public receiveMess(DatagramSocket socket){   //在构造函数中得到socket
        this.socket = socket;
    }
    public void run(){
        try{
            byte[] buffer = new byte[1024];    
            DatagramPacket packet =  new DatagramPacket(buffer,buffer.length);   //生成一个packet接收信息
            while(true){
                socket.receive(packet);
                String str = new String(packet.getData(),0,packet.getLength());
                System.out.println("receiveMessage : " + str);
            }
        }catch(Exception e){
            e.printStackTrace();
        }
        
    }
}

class sendMess implements Runnable{   //起线程发送信息
    DatagramSocket socket;
    public sendMess(DatagramSocket socket){
        this.socket = socket;
    }
    public void run(){
        try{
            //从键盘输入取得需要发送的信息，通过socket发送出去
            InputStream is = System.in;
            byte[] buffer = new byte[1024];
            DatagramPacket packet = null;
            while(true){
                int length = is.read(buffer);
                packet =  new DatagramPacket(buffer,length,InetAddress.getByName("localhost"),7050);
                socket.send(packet);
                String str = new String(packet.getData(),0,packet.getLength()).trim();
                System.out.println("sendMessage :" + str);
            }    
        }catch(Exception e){
            e.printStackTrace();
        }
        
    }
}

另一端的代码基本和上面的一样只不过端口号需要更改一下

import java.net.*;
import java.io.*;

public class Port_two{
    public static void main(String[] args) throws Exception{
        //use the multi-thread . 
        //one thread response for sneding message ,in this field you should use the System.in as the inputStream
        //the other response for receiveing the message
        DatagramSocket socket = new DatagramSocket(7050);
        new Thread(new receiveMess2(socket)).start();
        new Thread(new sendMess2(socket)).start();
        
        
        
    }
}

class receiveMess2 implements Runnable{
    DatagramSocket socket;
    public receiveMess2(DatagramSocket socket){
        this.socket = socket;
    }
    public void run(){
        try{
            byte[] buffer = new byte[1024];
            DatagramPacket packet =  new DatagramPacket(buffer,buffer.length);
            while(true){
                socket.receive(packet);
                String str = new String(packet.getData(),0,packet.getLength()).trim();
                System.out.println("receiveMessage : " + str);
            }
        }catch(Exception e){
            e.printStackTrace();
        }
        
    }
}

class sendMess2 implements Runnable{
    DatagramSocket socket;
    public sendMess2(DatagramSocket socket){
        this.socket = socket;
    }
    public void run(){
        try{
            //从键盘输入取得需要发送的信息，通过socket发送出去
            InputStream is = System.in;
            byte[] buffer = new byte[1024];
            DatagramPacket packet = null;
            while(true){
                int length = is.read(buffer);
                packet =  new DatagramPacket(buffer,length,InetAddress.getByName("localhost"),7000);
                socket.send(packet);
                String str = new String(packet.getData(),0,packet.getLength());
                System.out.println("sendMessage :" + str);
            }    
        }catch(Exception e){
            e.printStackTrace();
        }
        
    }
}

实验完成！