UDP多线程在线咨询

package edu.wtbu;

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 Demo10 implements Runnable{
    DatagramSocket socket=null;
    BufferedReader reader=null;

    private int fromPort;
    private String toIp;
    private int toPort;

    public Demo10(int fromPort, String toIp, int toPort) {
        this.fromPort = fromPort;
        this.toIp = toIp;
        this.toPort = toPort;
        try {
            socket = new DatagramSocket();
            reader = new BufferedReader(new InputStreamReader(System.in));
        } catch (SocketException e) {
            throw new RuntimeException(e);
        }
    }


    @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) {
                throw new RuntimeException(e);
            }
        }
        socket.close();
    }
}

package edu.wtbu;

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

public class Demo09 implements Runnable{
    DatagramSocket socket=null;
    private int port;
    private String msgFrom;

    public Demo09(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 {
                //准备接收包裹
                byte[] bytes = new byte[1024];
                DatagramPacket packet = new DatagramPacket(bytes, 0, bytes.length);
                socket.receive(packet);//阻塞式接收包裹

                byte[] data = packet.getData();
                String datas = new String(data, 0, data.length);
                System.out.println(msgFrom+":"+datas);
                if(data.equals("bye")){
                    break;
                }
            } catch (IOException e) {
                throw new RuntimeException(e);
            }

        }
        socket.close();
    }
}

package edu.wtbu;

//学生
public class Demo08 {
   //开启两个线程
   public static void main(String[] args) {
          new Thread(new Demo10(6666,"localhost",9999)).start();
          new Thread(new Demo09(8888,"老师")).start();
   }
}

package edu.wtbu;
public class Demo07 {

    public static void main(String[] args) {
       //老师
        new Thread(new Demo10(5555,"localhost",8888)).start();
        new Thread(new Demo09(9999,"学生")).start();
    }
}