Java示例-检查Socket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) {}
      }
   }
}