假设Tom和Jerry利用Java UDP进行聊天

1-1 假设Tom和Jerry利用Java UDP进行聊天，请为他们编写程序。具体如下：
（1）、Tom和Jerry聊天的双方都应该具有发送端和接收端；
（2）、利用DatagramSocket与DatagramPacket；
（3）、实现 java.lang.Runnable类，重写 run()方法。

Jerry代码：

public class UDPSocket_Jerry {
   public class UDPSocket_Jerry {
    public static void main(String[] args) {
        //分别启动发信息线程和收消息线程
        Thread thread1 = new Thread(new UDPSocketClientthread());
        Thread thread2 = new Thread(new UDPSocketServerthread());
        thread1.start();
        thread2.start();
    }
}

public class UDPSocketClientthread implements Runnable {
    DatagramSocket datagramSocket;

    {
        try {
            datagramSocket = new DatagramSocket(8081);
        } catch (SocketException e) {
            e.printStackTrace();
        }
    }

    byte[] ibuf = new byte[1024];
    DatagramPacket datagramPacket = new DatagramPacket(ibuf, ibuf.length);


    @Override
    public void run() {
        while (true) {
            try {
                datagramSocket.receive(datagramPacket);
            } catch (IOException e) {
                e.printStackTrace();
            }
            System.out.println("Tom：" + new String(datagramPacket.getData(), 0, datagramPacket.getLength()));
        }
    }
}

import java.io.IOException;
import java.net.*;
import java.util.Scanner;

public class UDPSocketServerthread implements Runnable {
    byte[] ibuf = new byte[1024];
    String message;
    Scanner scanner = new Scanner(System.in);
    DatagramPacket datagramPacket;

    {
        try {
            datagramPacket = new DatagramPacket(ibuf, ibuf.length, InetAddress.getByName("127.0.0.1"), 2020);
        } catch (UnknownHostException e) {
            e.printStackTrace();
        }
    }

    DatagramSocket ds;

    {
        try {
            ds = new DatagramSocket(8080, InetAddress.getByName("127.0.0.1"));
        } catch (SocketException | UnknownHostException e) {
            e.printStackTrace();
        }
    }

    @Override
    public void run() {
        while (true) {
            message = scanner.nextLine();
            datagramPacket.setData(message.getBytes());
            try {
                assert ds != null;
                ds.send(datagramPacket);
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
}

Tom代码:

public class UDPSocket_Tom {
    public static void main(String[] args) {
        Thread thread1 = new Thread(new UDPSocketClientthread());
        Thread thread2 = new Thread(new UDPSocketServerthread());
        thread1.start();
        thread2.start();
    }
}

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

public class UDPSocketClientthread implements Runnable{
        DatagramSocket datagramSocket;
    {
        try {
            datagramSocket = new DatagramSocket(2020);
        } catch (SocketException e) {
            e.printStackTrace();
        }
    }
        byte[] ibuf = new byte[1024];
        DatagramPacket datagramPacket = new DatagramPacket(ibuf, ibuf.length);


    @Override
    public void run() {
        while(true){
            try {
                datagramSocket.receive(datagramPacket);
            } catch (IOException e) {
                e.printStackTrace();
            }
            System.out.println("Jerry："+new String(datagramPacket.getData(),0,datagramPacket.getLength()));
        }
    }
}

import java.io.IOException;
import java.net.*;
import java.util.Scanner;

public class UDPSocketServerthread implements Runnable{
    byte[] ibuf = new byte[1024];
    String message;
    Scanner scanner = new Scanner(System.in);
    DatagramPacket datagramPacket;

    {
        try {
            datagramPacket = new DatagramPacket(ibuf, ibuf.length, InetAddress.getByName("127.0.0.1"), 8081);
        } catch (UnknownHostException e) {
            e.printStackTrace();
        }
    }
    DatagramSocket ds;
    {
        try {
            ds = new DatagramSocket(8083, InetAddress.getByName("127.0.0.1"));
        } catch (SocketException | UnknownHostException e) {
            e.printStackTrace();
        }
    }

    @Override
    public void run() {
        while (true) {
            message = scanner.nextLine();
            datagramPacket.setData(message.getBytes());
            try {
                assert ds != null;
                ds.send(datagramPacket);
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
}

代码运行截图（用两个终端开启）

本文地址：https://blog.csdn.net/Jackyyl729/article/details/110008831