hui zhang wrote:
Zack Grafton wrote:
hui zhang wrote:
Zack Grafton wrote:
hui zhang wrote:
Hi Everybody,
Now I am trying to launch an external application, for example,
"top" ,in my web application, and killing it by PID after a while.
But when I execute Runtime.getRuntime.exec("top") in my JSP page
or Servlet, Tomcat is stuck in that page and do not display
anything because it can not stop running until that "commnad" is
terminated, which means it waiting for the response from
Runtime.getRuntime.exec("top"). It seems that it will run forever.
Is there any solution to solve this problem? I mean that JSP page
can execute the following code no matter if it finish the process
is done.
BTW, I do not use System.exit() in my program. It may cause
Security Manager problem.
Thanks and best regards,
Hui
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Hey,
I'm new to the list and all, but you might want to try executing
"top" in batch mode. The command line option is -b on my gentoo
linux box. Also, be careful of executing commands from applets and
such. Another thing might be user permissions as well. You could
try executing the command and redirecting the output to a file and
parsing the file instead.
Zack Grafton
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Hi,
"TOP" is only an example in this case. Actually I am running some
program which can not stop running until terminating it by "Control
+ C". In this case, Tomcat can not run the following code if the
external application does not stop. I need a solution to make my
webapp running in this case. Thank you.
Regards,
Hui
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Hui,
You could check out the javadoc for the java.lang.Process class. You
would need to do something like:
Process process = Runtime.getRuntime().exec("command");
process.getInputStream();
process.getOutputStream();
Just remember to wrap the streams appropriately and you should be
able to read the stdin and stdout of the program. That should allow
you to send the <control>+C signal to the program.
Zack Grafton
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Hi,
I can get the InputStream from process object. How can I send
Control+C to the console next? I can not send another command to
console until this command is terminated.
BTW, what is the string format of "Control + C"?
Thanks!
Regards,
Hui
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Hui,
Not too sure, but I found a website that says its the decimal value of
the ascii character. Not too sure though. So for ctrl+c it might be
decimal value 4. Otherwise, I have no clue. Which program is it that
you're trying to run? There might be an alternative application if
everything else doesn't work.
Zack
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