Various operating system allow hooks to do be notified when items in the
filesystem change. But since we're using java - thats not the case here
so you need to something generic such as the following:

Create a new ServletContextListener - this will run once one webapp
loading. Have this spawn a new thread which watches the directory in
question. The thread will need to perform a directory listing to detect
changes - the strategy for determining changes can vary**. The thread
will operate in an infinite loop sleeping as per your threshold. The
inifinte loop should contain a conditional so it can be stopped when the
destory method of the ServletContextListener is called too.


David Kerber wrote:
> Hi, Tomcatters -
>
> I have a working application to which I need to add a new function,
> where I need to watch a networked directory (not on the local tomcat
> server machine) for newly-appearing files, which I will then process. I
> need to have this done at intervals not exceeding about two minutes.
> The files are sent by a remote machine doing an ftp put, over the internet.
>
> I can handle the file reading and processing with no trouble, but I've
> never done this kind of directory watching before. Can somebody give me
> some suggestions on how to do this? Is there some kind of function that
> will trigger an event when a new file appears? Do I put a 1 minute
> sleep in a loop, and check for new files each time through? Or
> something else?

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