a question about frameworks learning

[hello]

I have studied j2ee for several time ,now I want to study some application
frameworks ,but I have some quesitons before I start my study.which frameworks should I study?how to study this frameworks?how to begin my study?which books
should I read if I want to study such frameworks as spring ,hibernate ,struts and so on? could anyone give me some suggetions ?thank you

[Shoumin Li]

I think this article is helpful,so I need not type myself.^_^
http://articles.techrepublic.com.com/5100-22-5070873.html
[ July 30, 2007: Message edited by: Shoumin Li ]

[hello]

thank you for your reply.besides struts which you introduce ,but I still don't know which book is best for beginner ?which other frameworks should I learn?
could anyone give me futher suggestions? thank you