UDP实现多线程相互聊天

原创于 2023-04-05 14:02:36 发布 · 273 阅读

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#udp #java #网络协议

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该文章展示了一个使用Java实现的基于UDP的简单聊天程序。包括发送类(TalkSender)和接收类(TalkReceive)，它们分别实现了Runnable接口，允许在不同线程中运行。程序通过DatagramSocket进行数据包的发送和接收，用户输入的bye用于关闭连接。TalkStudent和TalkTeacher类分别模拟了学生和老师的角色，启动了发送和接收线程进行通信。

发送类

package com.kuang.chat;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetSocketAddress;
import java.net.SocketException;

public class TalkSender implements Runnable{
    DatagramSocket socket=null;
    BufferedReader reader=null;
    private int fromPort;
    private String toIP;
    private int toPort;

    public TalkSender(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) {
            e.printStackTrace();
        }

    }

    @Override
    public void run() {
        while (true) {
            try {
                String data = reader.readLine();
                byte[] datas = data.getBytes();

                DatagramPacket packet = new DatagramPacket(datas, 0, datas.length, new InetSocketAddress(this.toIP, this.toPort));
                socket.send(packet);
                if (data.equals("bye")) {
                    break;
                }
            } catch (IOException e) {
                e.printStackTrace();
            }

        }
        socket.close();


    }
}

接受类

package com.kuang.chat;

import java.io.IOException;
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() {

        //准备接收包裹

        while (true){
            try {
                byte[] container = new byte[1024];
                DatagramPacket packet = new DatagramPacket(container,0,container.length);
                socket.receive(packet);//阻塞式接收包裹
                //断开连接判断 bye
                byte[] data = packet.getData();
                String datas = new String(data, 0, data.length);

                System.out.println(msgFrom+":"+datas);

                //发送端多发送了一个空行换位符，所以if里是false，要加个清除换位符，就可以实现关闭连接！
                if (datas.trim().equals("bye")){
                    break;
                }
            } catch (IOException e) {
                e.printStackTrace();
            }


        }
        socket.close();
    }
}

学生类

package com.kuang.chat;

public class TalkStudent {
    public static void main(String[] args) {
        //开启两个线程
        new Thread(new TalkSender(7777,"localhost",9999)).start();
        new Thread(new TalkReceive(8888,"老师")).start();
    }
}

老师类

package com.kuang.chat;

public class TalkTeacher {
    public static void main(String[] args) {
        new Thread(new TalkSender(6666,"localhost",8888)).start();
        new Thread(new TalkReceive(9999,"学生")).start();
    }
}