I've written a little photo album servlet.  Images can be uploaded and
they are saved to some external directory: /some/dir/photos.

I'd like to be able to access these photos using <img> tags, but don't
know how to access anything outside of the external directory.  On the
other hand I don't want to save the images inside the webapps
directory as the photos will all be lost every time I redeploy the
app.

I've created a static dispatcher servlet to access the images, but
it's slower and seems to break browser caching.  Thus I'd prefer to
just use <img src="..."> tags if possible.

Can anyone point me in the right direction here?

Thanks,
J