UDP 一对一聊天多线程

最新推荐文章于 2022-07-18 00:34:38 发布

原创最新推荐文章于 2022-07-18 00:34:38 发布 · 245 阅读

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本文介绍了一个基于Java的UDP聊天应用程序的实现，包括发送和接收线程的创建，使用DatagramSocket进行网络通信，以及如何通过输入输出流实现消息的发送与接收。该应用允许两个用户（如教师和学生）进行简单的文本对话。

//发送类
package com.tencent.UDP;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.*;

public class TalkSend implements Runnable {
    DatagramSocket socket = null;
    BufferedReader reader = null;
    DatagramPacket packet = null;

    private int fromPort;
    private String toIp;
    private int toPort;

    public TalkSend(int fromPort , String toIp , int toPort) {
        this.fromPort = fromPort;
        this.toIp = toIp;
        this.toPort = toPort;
        try {
            socket = new DatagramSocket(fromPort);
            reader = new BufferedReader(new InputStreamReader(System.in));
        } catch (Exception e) {
            System.out.println(e.getMessage());
        }
    }

    @Override
    public void run() {
        while(true) {
            try {
                String msg = reader.readLine();
                System.out.println("我:" + msg);
                byte[] data = msg.getBytes();
                packet = new DatagramPacket(data , 0 , data.length ,
                        new InetSocketAddress(toIp , toPort));
                socket.send(packet);
                //发送完之后再结束
                if(msg.equals("bye")) break;
            } catch (Exception e) {
                System.out.println(e.getMessage());
            }
        }
        socket.close();
    }
}

//接收方
package com.tencent.UDP;

import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.SocketException;

public class TalkReceive implements Runnable {

    DatagramSocket socket = null;

    private int port;
    private String msgFrom;

    public TalkReceive(int port , String msgFrom) {
        this.port = port;
        this.msgFrom = msgFrom;
        try {
            socket = new DatagramSocket(port);
        } catch (SocketException e) {
            e.printStackTrace();
        }
    }

    @Override
    public void run() {
        while(true) {
            try {
                byte[] container = new byte[1024];
                DatagramPacket packet = new DatagramPacket(container , 0 , container.length);
                //阻塞接收
                socket.receive(packet);
                byte[] res = packet.getData();
                String data = new String(res , 0 , res.length);
                System.out.println(msgFrom + ":" + data);
                if(data.equals("bye")) break;
            } catch ( Exception e) {
                e.printStackTrace();
            }
        }
        socket.close();
    }
}

//教师用户:开启一个发送线程和一个接收线程
package com.tencent.UDP;

public class TalkSender {


    public static void main(String[] args) {

        new Thread(new TalkSend(7777, "localhost" , 9999)).start();

        new Thread(new TalkReceive(8888 , "老师")).start();


        System.out.println("--------12312312-------");

    }
}

//学生用户:开启一个发送线程和一个接收线程
package com.tencent.UDP;

public class TalkReceiver {

    public static void main(String[] args) {

        new Thread(new TalkSend(5555, "localhost" , 8888)).start();

        new Thread(new TalkReceive(9999 , "学生")).start();
    }
}

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