UDP實現多線程通信

//接收進程
import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.ServerSocket;

public class UDPrecive implements Runnable {

    int port;
    String name;


    DatagramSocket socket=null;
    DatagramPacket packet=null;


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

    @Override
    public void run() {
        while (true) {
            try {

                byte[] bytes = new byte[1024];
                packet = new DatagramPacket(bytes,0, bytes.length);
                socket.receive(packet);
                String msg= new String(packet.getData(),0,bytes.length);
                System.out.println(name+":"+msg);
                if (msg.equals("bye")){
                    break;
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        socket.close();
    }
}

//發送進程
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 UDPclient implements Runnable {
    int toPort;
    String toIP;
    DatagramSocket socket=null;
    DatagramPacket packet=null;
    BufferedReader reader=null;

    public UDPclient(int toPort,String toIP) {
        this.toIP = toIP;
        this.toPort=toPort;
        reader = new BufferedReader(new InputStreamReader(System.in));
        try {
            socket = new DatagramSocket();
        } catch (SocketException e) {
            e.printStackTrace();
        }
    }

    @Override
    public void run() {
        while (true) {
            try {
                String s = reader.readLine();
                byte[] bytes = s.getBytes();
                packet=new DatagramPacket(bytes,0,bytes.length,new InetSocketAddress(this.toIP,this.toPort));
                socket.send(packet);
                if (s.equals("bye")){
                    break;
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        try {
            reader.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
        socket.close();
    }
}

//學生端
public class Student {
    public static void main(String[] args) {
        new Thread(new UDPrecive(7777,"老師")).start();
        new Thread(new UDPclient(6666,"localhost")).start();
    }
}

//老師端
public class Teacher {
    public static void main(String[] args) {
        new Thread(new UDPrecive(6666,"學生")).start();
        new Thread(new UDPclient(7777,"localhost")).start();
    }
}

效果：