UDP多线程-在线咨询

class TalkSend implements Runnable：

package chat;

import java.io.BufferedReader;

import java.io.InputStreamReader;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetSocketAddress;


public class TalkSend implements Runnable{

    DatagramSocket socket=null;
    BufferedReader reader=null;

    private  int fromPort;
    private  String toIP;//对方的IP
    private  int toPort=8888;//对方的端口号

    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= null;
                data = reader.readLine();
                byte[] bytes=data.getBytes();
                DatagramPacket packet=new DatagramPacket(bytes,0,bytes.length,new InetSocketAddress(this.toIP,this.toPort));
                socket.send(packet);
                if (data.equals("bye")){
                    break;
                }

            } catch (Exception e) {
                e.printStackTrace();
            }

        }

        socket.close();


    }
}

class TalkReceive implements Runnable：

package chat;

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

public class TalkReceive implements Runnable{

    DatagramSocket socket;
    private int port;//自己的端口号
    private  String name;//发送人名字

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

    @Override
    public void run() {



        while(true){

            try {
                //准备接收包裹
                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
                byte[] data=packet.getData();
                String receiveData=new String(data,0,packet.getLength());

                System.out.println(name+"---->发过来的信息为："+receiveData);

                if (receiveData.equals("bye")){
                    break;
                }

            } catch (Exception e) {
                e.printStackTrace();
            }


        }
        socket.close();


    }
}

class TalkStudent:

package chat;

public class TalkStudent {
    public static void main(String[] args) {
        //开启两个线程
        //学生1给老师发消息
        new Thread(new TalkSend(9998,"localhost",8888)).start();
        //学生1接收老师的消息
        new Thread(new TalkReceive(7777,"老师")).start();

    }
}

class TalkTeacher:

package chat;

public class TalkTeacher {
    public static void main(String[] args) {

        //老师给学生1发消息
        new Thread(new TalkSend(9999,"localhost",7777)).start();
        //老师接收学生1的消息
        new Thread(new TalkReceive(8888,"学生1")).start();
    }
}

运行：