java端口代码_端口扫描程序java实现

怎么样扫描计算机系统本地和远程的端口，监测其是打开还是关闭的在很多应用程序中都要用到，下面是用java实现的简单的端口扫描程序。

Source Code：

http://www.gaodaima.com/40985.html端口扫描程序java实现

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/*

* Created on 2005-3-22

*

* TODO To change the template for this generated file go to

* Window - Preferences - Java - Code Style - Code Templates

*/

/**

* @author whandey connect to me: [email protected]

*

* TODO To change the template for this generated type comment go to

* Window - Preferences - Java - Code Style - Code Templates

*/

import java.io.*;

import java.net.*;

import java.util.*;

public class socketPort {

public static void main(String[] args) {

String ip = "159.162.39.27";

String hostname = new String();

try{ //get the target ip address and hostname

InetAddress address = InetAddress.getByName(ip);

System.out.println(address);

hostname = address.getHostName();

System.out.println(hostname);

}

catch(UnknownHostException e)

{

System.out.println("Could not find "+ ip);

}

try

{ // creat the output file

PrintWriter fout = new PrintWriter( new FileWriter("PortInf.txt"));

fout.println("Information Of The Port On the " + hostname +"computer ");

fout.println();

// do ports scan

for(int nport = 25;nport < 30;++nport)

{

try

{

Socket s = new Socket(hostname,nport);

fout.println("The port " + nport + " is open!");

fout.println("Connected to "+ s.getInetAddress() + " on port " + s.getPort() + " from port "+ s.getLocalPort() + " of " + s.getLocalAddress());

//print the connected socket information

}

catch(IOException e)

{

fout.println("The port " + nport + " is closed!");

}

}

fout.close();

}

catch(IOException e){}

}

}

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