Java示例检查端口

import java.net.*;

import java.io.*;



public class Main {

   public static void main(String[] args) {

      Socket Skt;

      String host = "localhost";



      if (args.length > 0) {

         host = args[0];

      }

      for (int i = 0; i < 1024; i++) {

         try {

            System.out.println("Looking for "+ i);

            Skt = new Socket(host, i);

            System.out.println("There is a server on port " + i + " of " + host);

         } catch (UnknownHostException e) {

            System.out.println("Exception occured"+ e);

            break;

         } catch (IOException e) {}

      }

   }

}