自学java——网络编程UDP多线程实现通信2

TalkSend线程类编写

发送端线程

package com.wang.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;
    //定义一个发送线程类
    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) {
            e.printStackTrace();
        }
    }
    //重写Runnable中的run方法，使其添加到线程中实现此方法
    @Override
    public void run() {
        while (true) {
            //创建包，并读取cli输入内容进行封装
            String data = null;
            try {
                data = reader.readLine();
                //将信息转换为字节数组
                byte[] datas = data.getBytes();
                //定义数组，数组的长度，发送地址，端口号
                DatagramPacket packet = new DatagramPacket(datas,0,datas.length,new InetSocketAddress(this.toIP,this.toPort));
                //发送数据包
                socket.send(packet);
                if (data.equals("bye")){
                    break;
                }
            } catch (IOException e) {
                e.printStackTrace();
            }

        }

        socket.close();

    }
}

———————————————————————————————————————————

接收端线程

package com.wang.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;
    //定义接收线程类
    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() {

//        DatagramSocket socket = new DatagramSocket(6666);

        while (true){
            try {
                //接受包裹
                byte[] container = new byte[1024];

                DatagramPacket packet = new DatagramPacket(container,0,container.length);

                socket.receive(packet);//阻塞式接受包裹

                byte[] data = packet.getData();

                String receiveData = new String(data,0, packet.getLength());
                System.out.println(msgFrom + ":" + receiveData);
                //断开连接 bye
                if (receiveData.equals("bye")) {
                    break;
                }
            } catch (IOException e) {
                e.printStackTrace();
            }

        }
        socket.close();

    }
}

———————————————————————————————————————————

实体类用户端1

package com.wang.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();
    }
}

———————————————————————————————————————————

实体类用户端2

package com.wang.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();
    }
}