How to execute command line by Java

Question

Hi all,
I have the following DOS command line that I need to execute it through Java:
C:\Documents and Settings\Mxmler\Desktop\bin>vr1tovr2 Box.wrl -o Box2.wrl
I know that I have to use Runtime.getRuntime().exec, But can anyone show me how to use it for the above?
Thanks

Answer 1

Mxmler wrote:
I need your help please
Forget about the first thread
vr1tovr2 located inside a sub directory called converted (not in the main directory of the project constructed by eclipse)You have to tell the system where to find the program you're trying to run. You can specify the full path to the executable. Alternatively, you can specify the PATH environment variable when you call exec() (and I presume there's something similar for java.lang.ProcessBuilder). Read the docs.
Box.wrl & Box2.wrl (will be generated) both of them are located in another directory called usrYou can either specify full paths to those files, or you can set the current working directory when you call exec(). So you'd tell exec() that you're in the directory where those files are. Read the docs.
I have tried to do the following and I got the following error message: CreateProcess error=2, The system cannot find the file specifiedYou need to do what I said above, in particular, the first one (where you tell the system where to find the program you're trying to run).
String path = System.getProperty("user.dir");
String userFolder = "usr";
String fileName = "mxmler";
String extension = ".wrl";
Runtime.getRuntime().exec("vr1tovr2 "
            + Key.QUOTE
            + path
            + Key.FORWARD_SLASH
            + userFolder
            + Key.FORWARD_SLASH
            + fileName + extension
            + Key.QUOTE
            + " -o "
            + Key.QUOTE
            + path
            + Key.FORWARD_SLASH
            + userFolder
            + Key.FORWARD_SLASH
            + fileName + "v2" + extension
            + Key.QUOTE);If you're going to break it down like that, then don't use the version of exec() that takes a single String for the whole command line. Use the version of exec() that takes an array of Strings (the first String in the array is the program to run, and the remaining strings in the array are arguments to that program).