我有一个样例代码如下,套接字绑定到IP 10.10.88.11和端口9876。我进行了以下两种条件的测试,使用Wireshark进行监测,这两台计算机都在同一子网中。
- 从相同的计算机(10.10.88.11)发送UDP数据包 - UDP服务器能够接收
- 从另一台计算机(10.10.88.10)发送UDP数据包 - UDP服务器无法接收,但Wireshark(在10.10.88.11上)可以捕获数据包
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);
}
}
}