我有一个示例代码,如下所示,套接字绑定到IP 10.10.88.11和端口9876。我用wireshark测试了2个条件,如下所示。两台PC都在同一个子网中。
1.从同一台PC发送UDP数据包(10.10.88.11)- UDP服务器能够接收
1.从另一台电脑(10.10.88.10)发送UDP数据包- UDP服务器无法接收,但Wireshark(10.10.88.11)能够捕获数据包
我已经搜索了互联网,但找不到解决方案。我在创建InetScoketAddress时有什么错误吗?
import java.io.*;
import java.net.*;
public class UDPServer {
public static void main(String args[]) throws Exception {
InetSocketAddress address = new InetSocketAddress("10.10.88.11", 9876);
DatagramSocket serverSocket = new DatagramSocket(address);
byte[] receiveData = new byte[1024];
byte[] sendData = new byte[1024];
while(true)
{
DatagramPacket receivePacket = new DatagramPacket(receiveData, receiveData.length);
System.out.println("Waiting to receive");
serverSocket.receive(receivePacket);
String sentence = new String( receivePacket.getData());
System.out.println("RECEIVED: " + sentence);
InetAddress IPAddress = receivePacket.getAddress();
int port = receivePacket.getPort();
String capitalizedSentence = sentence.toUpperCase();
sendData = capitalizedSentence.getBytes();
DatagramPacket sendPacket =
new DatagramPacket(sendData, sendData.length, IPAddress, port);
serverSocket.send(sendPacket);
}
}
}
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1条答案
按热度按时间ffscu2ro1#
我相信Wireshark能够在防火墙评估数据包之前抓取数据包,这意味着你会检测到它们,但它们永远不会到达java应用程序。