Java Web development in eclipse

I a开发者_如何学JAVAm building a web application using java servlets and jsp. Every thing is working fine but I can't see the source code of the files like HttpServlet from my eclipse IDE. I think I need to download J2EE sdk. Right ?? Please tell the steps

Thank you all

There's a cool tool called jad that will do this for you.

Here's a link that explains how to install it: http://www.mkyong.com/java/java-decompiler-plugin-for-eclipse/