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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