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Windows command from within my Java program.

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Join Date: Apr 2007

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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:

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 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,

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Join Date: May 2007

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Ezzaral

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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.

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Join Date: Sep 2009

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nomemory

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Re: Windows command from within my Java program.

Sep 23rd, 2009

Try to create the process using the ProcessBuilder class:

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 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:

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 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:

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Scanner sc= new Scanner(proc.getInputStream());
Scanner sc= new Scanner(proc.getInputStream());

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