是否有任何好的网站教授数据报套接字在Java中使用？

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

public class DatagramSocketExample {
    public static void main(String[] args) {
        try {
            // 创建数据报套接字
            DatagramSocket datagramSocket = new DatagramSocket();

            // 准备要发送的数据
            String message = "Hello, world!";
            byte[] messageBytes = message.getBytes();

            // 创建数据报包
            InetAddress address = InetAddress.getByName("localhost");
            DatagramPacket sendPacket = new DatagramPacket(messageBytes, messageBytes.length, address, 8080);

            // 发送数据报包
            datagramSocket.send(sendPacket);

            // 关闭套接字
            datagramSocket.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

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

public class DatagramSocketExample {
    public static void main(String[] args) {
        try {
            // 创建数据报套接字
            DatagramSocket datagramSocket = new DatagramSocket(8080);

            // 准备接收数据的缓冲区
            byte[] receiveBuffer = new byte[1024];

            // 创建数据报包
            DatagramPacket receivePacket = new DatagramPacket(receiveBuffer, receiveBuffer.length);

            // 接收数据报包
            datagramSocket.receive(receivePacket);

            // 获取发送方的地址和端口
            InetAddress senderAddress = receivePacket.getAddress();
            int senderPort = receivePacket.getPort();

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

            // 关闭套接字
            datagramSocket.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}