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April 2000

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This page contains an archived post to the Java Answers Forum made prior to February 25, 2002. If you wish to participate in discussions, please visit the new Artima Forums.

Message:

Runtime exec

Posted by Hien Tran on June 12, 2000 at 2:23 PM

From the Sun developer help site, here is the workaround suggested for spawning Win NT command prompt:

p = Runtime.getRuntime().exec("cmd.exe /c cmd.exe /c runtest.bat ");

I tested and it worked. Good luck !
Hien.

> Hi,
> I was trying to run a batch file from my program, so I did the following:
> public static void main (String []args) {
> /*
> Threadtest t = new Threadtest();
> t.start();*/
> testrun();
> }

> public static void testrun () {
> BufferedReader br = null;
> BufferedReader br2 = null;
> Process p = null;
> int status = -1;
> try {
> String osName = System.getProperty("os.name");
> if (osName.compareTo("Windows NT") == 0) {
> //String []test = "cmd.exe", "/c", "runtest.bat");
> p = Runtime.getRuntime().exec("cmd.exe /c runtest.bat ");
> }
> br = new BufferedReader(new InputStreamReader(p.getErrorStream()));
> String s;
> while ((s = br.readLine())!= null) {
> System.out.println(s);
> }
> br2 = new BufferedReader(new InputStreamReader(p.getInputStream()));
> while ((s = br2.readLine())!= null) {
> System.out.println(s);
> }
> br.close();
> br2.close();
> }catch (IOException ioex) {ioex.printStackTrace();}
> //return 0;
> }
> Now, this starts the dos prompt, and then the program waits on it.
> It only continues after I kill the dos prompt. Is there any way that I can start the process and then forget about it?
> I dont want to have any control after spawning off the process.
> Could anyone help me with this problem?
> Thanks
> Sasipriya






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