udpscan.java

来自「这是一张java应用教程的随书光盘」· Java 代码 · 共 15 行

import java.net.*;
public class UDPScan
{public static void main(String args[])
 { for (int port=1024;port<=65535;port++) {
    try {
      DatagramSocket server=new DatagramSocket(port);
      server.close();
       }
   catch(SocketException e) {
     System.out.println("there is a server in port "+port+".");
      }
   }
 }
}