Differences between filter and Interceptors?

[James Collings]

I'm researching this so that I can respond better in interviews. I've been searching around for a clear and concise answer.

So far, and by all means correct me if I am wrong or lacking in detail:

1. Filters are part of the Servlet API, Interceptors are Struts 2. (Seems obvious though)
2. The Interceptor stack fires on requests in a configured package while filters only apply to their mapped URLs.
3. Interceptors can be configured to execute or not depending on specific target action methods via excludeMethods and includeMethods while Filters lack this feature.
4. Filters are an implementation of the Intercepting Filter pattern while Interceptors are of the Interceptor pattern.

Does this seem like an accurate and complete answer? Should I add anything?

[Mohana Rao Sv]

Avoid cross posting Fiters vs Interceptor.

Above 3 points are correct I'm not sure about last one. Interceptors follows command pattern I wanna add one more point even struts2.x required a filter StrutsPrepareAndExecuteFilter is act as a centralized request processing.