UDP聊天室（Java）

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最新推荐文章于 2025-03-23 18:23:33 发布

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分类专栏：基础文章标签： udp 网络 tcp/ip

本文链接：https://blog.youkuaiyun.com/weixin_67630324/article/details/128688816

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该文章展示了一个使用UDP协议创建的聊天室示例，包括TalkSend和TalkReceive两个线程，分别负责发送和接收消息。TalkSend从控制台读取输入并通过DatagramSocket发送到指定IP和端口，而TalkReceive在同一端口监听并打印接收到的信息。学生端和教师端分别启动发送和接收线程进行交互，输入bye可结束聊天。

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1.Udp实现聊天室，和Tcp不同的是Udp协议下发送的消息不经过服务器，直接由一个客户端发送到另一个客户端。

2.Udp聊天的真实案例就是在浏览器里，和医生咨询，这个大部分是用UDP实现的。

3.这个聊天室是由发送线程TalkReceive和接收线程TalkSend组成。

TalkSend：构造方法传入的是发送端口号，要发送到的IP，和接收信息的端口号。

package UDP聊天;

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 TalkSend implements Runnable{
    DatagramSocket socket=null;
    BufferedReader reader=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 (SocketException e) {
            throw new RuntimeException(e);
        }
    }


    @Override
    public void run() {
        //准备数据，控制台读取 System.in

        while (true){
            String data= null;
            try {
                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) {
                throw new RuntimeException(e);
            }
        }

        try {
            reader.close();
            socket.close();
        } catch (IOException e) {
            throw new RuntimeException(e);
        }

    }
}

TalkReceive:构造方法传入的是接收信息的端口号和发送信息的名字

package UDP聊天;

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) {
            throw new RuntimeException(e);
        }
    }

    @Override
    public void run() {
        while(true){
            try {
                byte[] container = new byte[1024];
                DatagramPacket packet = new DatagramPacket(container,0,container.length);
                socket.receive(packet);
                //断开连接
                byte[] datas=packet.getData();
                String ReceiveData = new String(datas, 0, datas.length).trim();
                System.out.println(msgFrom+":"+ReceiveData);
                if (ReceiveData.equals("bye")){
                    break;
                }
            } catch (IOException e) {
                throw new RuntimeException(e);
            }
        }
        socket.close();


    }
}

具体实现学生端和老师端

学生端TalkStudet

package UDP聊天;

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

教师端：TalkTeacher

package UDP聊天;

public class TalkTeacher {
    public static void main(String[] args) {
        new Thread(new TalkSend(5555,"localhost",8888)).start();
        new Thread(new TalkReceive(9999,"学生")).start();
    }
}

运行效果：输入bye结束聊天