What is the motivation to use filters in a struts application

[sid sree]

Hi,
I am new to struts & from my limited understanding i guess that all my requests would pass through the action servlet(Controller) in the case all my authentication code can be placed here .

Assuming my motivation to create a filter is to implement security , cannot my action servlet just do that job ?

Thanks in advance

[Jeanne Boyarsky]

An action servlet can do it. So can a filter or a request dispatcher. note that a filter can be reused if you have more than one servlet or application.