如何在多宿主机器上以Java发送和接收UDP数据包？

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

public class UDPSender {
    public static void main(String[] args) {
        try {
            // 创建一个DatagramSocket对象，指定发送端口
            DatagramSocket socket = new DatagramSocket(9000);

            // 创建一个DatagramPacket对象，包含要发送的数据和接收方的地址和端口
            String message = "Hello, this is a UDP message.";
            InetAddress address = InetAddress.getByName("127.0.0.1");
            DatagramPacket packet = new DatagramPacket(message.getBytes(), message.length(), address, 8000);

            // 发送数据报
            socket.send(packet);

            // 关闭socket
            socket.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

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

public class UDPReceiver {
    public static void main(String[] args) {
        try {
            // 创建一个DatagramSocket对象，指定接收端口
            DatagramSocket socket = new DatagramSocket(8000);

            // 创建一个数组，用于存储接收到的数据
            byte[] buffer = new byte[1024];

            // 创建一个DatagramPacket对象，包含接收到的数据和发送方的地址和端口
            DatagramPacket packet = new DatagramPacket(buffer, buffer.length);

            // 接收数据报
            socket.receive(packet);

            // 打印接收到的数据
            String receivedData = new String(packet.getData(), 0, packet.getLength());
            System.out.println("Received data: " + receivedData);

            // 关闭socket
            socket.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}