Java端口扫描程序 [英] Java Port scanner

问题描述

import java.net.Socket;
import java.io.IOException;

public class Main {


    public static void main(String[] args) {
       String remote = "69.163.44.171";
       int i = 0;
       do {
       try {
       Socket s = new Socket(remote,i);
       System.out.println("Server is listening on port " + i+ " of " + remote);
       s.close();

       } catch (IOException ex) {
       System.out.println("Server is not listening on port " + i+ " of " + remote);
    }
       i++;
       } while(i == 55000);
}

输出：

Server is not listening on port 0 of 69.163.44.171
BUILD SUCCESSFUL (total time: 0 seconds)

我使用while循环导致它更快，现在问题为什么它只扫描一个端口？

i use while loop cause it is faster, now to the question why does it only scan one port?

推荐答案

嗯...... 你认为条件的频率是多少（i == 55000）将 true ？

Well... how often did you think the condition while(i == 55000) would be true?

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