Java网络编程UDP实现多线程在线聊天

本文实例为大家分享了java实现多线程在线聊天的具体代码，供大家参考，具体内容如下

上一篇博客通过udp实现了聊天，但只能单方面发送消息，这次实现了多线程在线聊天，也就是可以双方互发消息。

发送消息：

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 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 (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();
    }
}

接收消息：

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() {

        while (true) {
            try {
                //准备接收数据
                byte[] container = new byte[1024];
                datagrampacket packet = new datagrampacket(container,0,container.length);
                socket.receive(packet);//阻塞式接受包裹

                //断开连接 bye
                byte[] data = packet.getdata();
                string receivedata = new string(data,0,data.length);

                system.out.println(msgfrom + ":" +receivedata);
                if (receivedata.equals("bye")) {
                    break;
                }
            } catch (ioexception e) {
                e.printstacktrace();
            }
        }
        socket.close();
    }
}

用户1：学生

package com.kuang.chat;

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();
    }
}

用户2：老师

package com.kuang.chat;

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();
    }
}

运行结果：

1、启动学生端，开始运行

2、启动教师端，开始运行

3、学生发送消息，教师收到

4、教师发送消息，学生收到

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。