如何从Java中获取网络数据包数据

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

public class ReceivePackets {
    public static void main(String[] args) {
        try {
            // 创建一个DatagramSocket实例，监听指定端口
            DatagramSocket serverSocket = new DatagramSocket(9876);
            byte[] receiveData = new byte[1024];

            while (true) {
                // 创建一个DatagramPacket实例，用于接收数据
                DatagramPacket receivePacket = new DatagramPacket(receiveData, receiveData.length);

                // 接收数据包
                serverSocket.receive(receivePacket);

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

                // 打印发送方的地址和端口
                System.out.println("Received packet from: " + senderIPAddress.getHostAddress() + ":" + senderPort);

                // 将接收到的数据转换为字符串
                String receivedData = new String(receivePacket.getData(), 0, receivePacket.getLength());

                // 打印接收到的数据
                System.out.println("Packet data: " + receivedData);
            }
        } catch (SocketException e) {
            System.out.println("Socket exception: " + e.getMessage());
            e.printStackTrace();
        } catch (IOException e) {
            System.out.println("IO exception: " + e.getMessage());
            e.printStackTrace();
        }
    }
}

javac ReceivePackets.java
java ReceivePackets