Prevent Hot linking to servlets

[timesign]

Is there a way to prevent other sites from hotlinking to your servlet?
My servlet serves files and I don't want it to be called from another website.
Thanks

 

[sedj]

Using the HttpServletRequest and ServletRequest objects, there are methods to determine the "forwarding" URL, and IP and machine name (I forget the precise methods, but take a look at the API docs) - so you could test these - if they are not yours, then dump the request.