Difference between Filter and Listener in Servlet (Java EE)

Question

There are Filters and Listeners functionality in Servlet. I want to know exact difference between Filter and Listener.

Answer 1

You can easily have a rough idea with the English meaning of those two.

Filter is there to filter the content/resource which coming to/going out from a Servlet. In the other hand, Listener is there, to do some related things when something happen to the web application(listening).