What is a good resource for learning equivalent JSP, JSTL tags/EL, and Struts tags?

I'm looking to separate business logic from presentation in a project开发者_Python百科, but the business logic is written using a mixture of tag libraries. Are there any good resources for going from one taglib to another, converting Scriptlet code to EL and back, etc?

Head First Servlets and JSP by Bates & Sierra is good.

Scoping - EL, Struts Tags, JSP Equivalent forms
Particularly in "Using the JSP 2.0 Expression Language with Jakarta Struts"

Logic and Bean Tags - Related JSTL Mechanisms (Page 28,29)

Struts Logic Tag attribute descriptions
Struts Bean Tag attribute descriptions

The Struts documentation on struts.apache.org also lists JSTL equivalents for a few tags, as well as descriptions of tag attributes, but I personally found it to be less than thorough on the former, and less readable than the IBM documentation on the latter.