Setting Unix Cronjob via user input in JSP Page

I would like to put the time parameter of unix cronjob as a field in JSP for users to define the job frequency as they wish, without me modifying the crontab manually.

Say, the user access a JSP page with the field "Time" and enter 0800 for a daily cronjob at the backend.

Any clues on how to handle such cases?
Pls advice.
Thanks a lot.
adelineAsked:
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sompol_kiatkamolchaiConnect With a Mentor Commented:
You can open cron file in servlet and modify it.

or

You can use java.util.Time and java.util.Timer to do scheduler.

or

You can use an open-source job scheduler name Quartz

http://www.opensymphony.com/quartz
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mark-bCommented:
Here is an open source project that does cron in Java:

http://jcrontab.sourceforge.net

-Mark
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