Also, use ProcessBuilder. You haven't really said what DOS command
you're trying to run but here's what you'd do to quietly delete (ie.
no prompts) all the files in some test directory.
ProcessBuilder b = new ProcessBuilder("cmd", "/C", "del", "/Q", "\\some
\\test\\directory");
//sets the working directory of the process - don't NEED to do this if
your command points to a full path
//If you don't set this, the CWD will be the same as "user.dir" system
property
b.directory("\\some\\dir");
//pipe stderr into stdout (useful if you just need to drain the output
of the command and don't care
//if the data is error or info data)
b.redirectErrorStream(true);
Process p = b.start();
//wait for the command to finish executing
p.waitFor();
//0 is the standard for "normal" execution exit value (depends on the
actual executable though)
int exitStatus = p.exitValue();
Additionally, if the command you're running has the potential to spit
out lots of output, you'll probably what to run a concurrent thread
and drain the process's stdout/err because all that data sits in a
buffer until you read it. So if it's a lot of data it could cause
memory problems for you.
On Aug 12, 12:11 pm, Paul Robinson <ukcue...@gmail.com> wrote:
> call Process.waitFor() -- this blocks until the process finishes
>
> and then try looking at the output after calling waitFor()
>
> Rahul wrote:
> > -lothar
> > I did that, there is no debugout neither a new directory is made when
> > i execute from gwt. If i execute it manually from the dos prompt I am
> > getting the desired output.
>
> > -Paul
> > I tired calling your way also, nothing happens when im running a bat
> > file,no ouput is generated. but when i tired opening the notepad it
> > opens. There is no output in Process.getErrorStream()
>
> > I believe that as lothar said, the Finalizer is killing my batch so
> > fast that it never gets executed
> > so how can i slow down the finalizer that my batch executes?
>
> > On Aug 12, 11:59 am, Paul Robinson <ukcue...@gmail.com> wrote:
>
> >> It may be that some useful output is going to the process's standard
> >> output or standard error. You can get at that by calling
> >> Process.getInputStream() andProcess.getErrorStream()
>
> >> Rahul wrote:
>
> >>> Hi,
> >>> Thanks a lot for your replies
>
> >>> -lothar, its not leading to an IO exception, I checked it
> >>> - paul, i could not follow what you were trying to say
>
> >>> when changed to cmd to notepad, the notepad opens
>
> >>> when I read more about the exec command it says that it does not open
> >>> the command prompt(the black window), but it still executes the batch
> >>> job
> >>> so i am using the string :
> >>> try {
> >>> Runtime.getRuntime().exec("cmd.exe /C start
> >>> test.bat");
> >>> } catch (IOException e) {
> >>> // TODO Auto-generated catch block
> >>> e.printStackTrace();
> >>> }
>
> >>> test.bat makes a hello directory in the specified location, but its
> >>> not working from this code.
> >>> if recognizes that its executint test.bat but theres no output
>
> >>> when im runnning test.bat from dos prompt the desired output is
> >>> obtained but not from this
>
> >>> On Aug 12, 11:15 am, Paul Robinson <ukcue...@gmail.com> wrote:
>
> >>>> Try:
>
> >>>> Process p = Runtime.getRuntime().exec("cmd.exe");
> >>>> InputStream is = p.getInputStream();
>
> >>>> and then look at what you can read from the input stream
>
> >>>> Rahul wrote:
>
> >>>>> Hi,
> >>>>> I want to execute dos commands from gwt. Reading from this forum I
> >>>>> have to invoke the call from server not from the client.
> >>>>> This is my server side code:
>
> >>>>> public String greetServer()
> >>>>> {
> >>>>> try {
> >>>>> Runtime.getRuntime().exec("cmd.exe");
> >>>>> } catch (IOException e) {
> >>>>> // TODO Auto-generated catch block
> >>>>> e.printStackTrace();
> >>>>> }
> >>>>> return "Hello";
>
> >>>>> }
>
> >>>>> I am getting success at the client side that it was executed properly,
> >>>>> but I have one question: should the dos prompt window open when i
> >>>>> execute this program?? i tired putting cmd,cmd.exe but still the dos
> >>>>> prompt doesnt open
> >>>>> can anyone tell me what should i do ?
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