Java

Java RSS

Windows command from within my Java program.

Please support our Java advertiser: Programming Forums - DaniWeb Sister Site

•

Join Date: Apr 2007

Posts: 126

Reputation: new_2_java is an unknown quantity at this point

Solved Threads: 6

new_2_java new_2_java is offline

Offline

Junior Poster

Windows command from within my Java program.

Sep 23rd, 2009

Hi all,

I am trying to execute a windows command from within my java program, but I can't get it to execute the DOS command. Here's my code:

 Help with Code Tags 
 java Syntax (Toggle Plain Text) 
try {
    Process p = Runtime.getRuntime().exec("cmd.exe /C cls");
} catch (IOException e) {
    // catch exception
}
try {
    Process p = Runtime.getRuntime().exec("cmd.exe /C cls");
} catch (IOException e) {
    // catch exception
}

But, the code doesn't clear the screen, nor it gives any error. Can you please let me know, what I am doing wrong here?

Thanks,

•

Join Date: May 2007

Posts: 4,479

Reputation: Ezzaral has much to be proud of

Solved Threads: 514

Ezzaral

Offline

Industrious Poster

Re: Windows command from within my Java program.

Sep 23rd, 2009

What are you expecting it to do? That command isn't going to produce any noticeable output.

•

Join Date: Sep 2009

Posts: 26

Reputation: nomemory is an unknown quantity at this point

Solved Threads: 5

nomemory

Offline

Light Poster

Re: Windows command from within my Java program.

Sep 23rd, 2009

Try to create the process using the ProcessBuilder class:

 Help with Code Tags 
 Java Syntax (Toggle Plain Text) 
ProcessBuilder pb= new ProcessBuilder(command);
Process proc= pb.start();
ProcessBuilder pb= new ProcessBuilder(command);
Process proc= pb.start();

"command" is a list of Strings. For Windows it should look like this:

 Help with Code Tags 
 Java Syntax (Toggle Plain Text) 
String[] command= { "cmd", "/C" , "dir" };
String[] command= { "cmd", "/C" , "dir" };

Additional:
After you create the output, you can obtain a stream of data from the process object itself:

 Help with Code Tags 
 Java Syntax (Toggle Plain Text) 
Scanner sc= new Scanner(proc.getInputStream());
Scanner sc= new Scanner(proc.getInputStream());

(if you want to wrap the stream inside a scanner)