Re: execute an executable file from java

[Michal Wallace <sabren@manifestation.com>]

/*
On Mon, 2 Jul 2001, Lan Vo wrote:

> Would someone please teach me how to call an exe file from java?  Is
> it possible to make a java program works with an exe in an endless
> loop, like inter-process communication?

It's pretty easy.. Just use Runtime.getRuntime().exec();

That'll return a Process object, for which you can get an InputStream
or OutputStream. (and Note that the exe's output will be an
InputStream as far as your program is concerned). 

Here's a simple example... The exec'ed command just prints hello.

Cheers,

- Michal
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*/


import java.io.*;

public class Exec {
    public static void main(String[] args) { 
	Runtime run = Runtime.getRuntime();
	try {
	    Process python = run.exec("python -c\"print'hello'\"");
	    python.waitFor();
	    BufferedReader in = new BufferedReadeer
		( new InputStreamReader(python.getInputStream()) );
	    String line;
	    while ((line = in.readLine()) != null) {
		System.out.print(line);
	    }
	} catch (Exception e) {
	    System.out.println(e.getMessage());
	}
    }
}