Shut down all PCs(Windows 7) in LAN using Java from Linux

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I have made a web application that shutdown all PCs in LAN in one click. I am working in a computer lab and shutting down all PCs daily is very irritating for me. So, I decided to develop an application that search all PCs, which are turned on and shut them all.

My environment is:- (prerequisite)

1. I use Ubuntu 14.04 LTS on my PCs.
2. All LAN PCs are using windows 7 Operating System.
3. Java should be installed on server.

Since this application is client-server based, so some setting and software will be required on both side.

1. On client side:-

To shut down PC from remote location you require some registry edit in Windows 7 system.

Open command prompt as administrator and run following command:-

reg add HKLM\SOFTWARE\MICROSOFT\WINDOWS\CURRENTVERSION\POLICIES\SYSTEM /V LocalAccountTokenFilterPolicy /t REG_DWORD /d 1

OR

Open the registry editor by going to Start and typing in regedit. Now navigate to the following key:

HKEY_LOCAL_MACHINE – SOFTWARE – Microsoft – Windows – CurrentVersion – Policies – System

Right-click on System on the left hand side and choose New – DWORD (32-bit) Value.

Now your client machine is ready to shut down remotely.

2. On server side:-

In my case, I am running Ubuntu 14.04 and I have installed Java version “1.8.0_74” of Oracle.

To shut down windows PC from Linux machine, we required to install a package samba-common. We can install this by typing on terminal

sudo apt-get install samba-common

After installing this package run following command to check that everything is working:-

net rpc shutdown -I ipaddress -U username%password

note:- If server is windows machine, you can find the windows command to shutdown a remote PC.

3. A Java program

If remote shutdown is successful after above set up, we require a Java program to make it automatic.

To shut down a single machine, Java code is given below:-

import java.io.*;

String com="net rpc shutdown -I";

String ip="192.168.25.52";

String cred="-U admin%logitech";

String command=com+" " +ip+" "+cred;

try {

Process process = Runtime.getRuntime().exec(command);

System.out.println("the output stream is "+process.getOutputStream());

BufferedReader reader=new BufferedReader( new InputStreamReader(process.getInputStream()));

String s;

while ((s = reader.readLine()) != null){

System.out.println("The inout stream is " + s);

}

} catch (IOException e) {

e.printStackTrace();

}

If you want to shutdown all LAN PCs, code can be:-

try{

String com="net rpc shutdown -I";

String cred="-U admin%logitech";

byte[] ip = {(byte)192, (byte)168, 25, 1}; // for 192.168.0.x addresses and starting ip address

for (int i = 1; i <=5; i++) //this will shut 1 to 5 pcs in ip range, you can limit the loop as many pcs you want to shut

{

ip[3] = (byte)i;

InetAddress address = InetAddress.getByAddress(ip);

String ipad=address.toString().substring(1);

String command=com+" " +ipad+" "+cred;

System.out.println(command);

Process process = Runtime.getRuntime().exec(command);

System.out.println("the output stream is "+process.getOutputStream());

BufferedReader reader=new BufferedReader( new InputStreamReader(process.getInputStream()));

String s;

while ((s = reader.readLine()) != null){

System.out.println("The inout stream is " + s);

}

}

}

catch(Exception e)

{

}

Either you can implement this code on a java program or in JSP/Servlet to shut LAN PCs.