Struts2源码学习网址：

http://blog.csdn.net/java2000_wl/article/details/7572828

http://downpour.iteye.com/category/54022

http://www.cnblogs.com/yangjin-55/archive/2012/05/16/2786550.html

http://rubbing-struts2.iteye.com/blog/1582443

 http://www.doc88.com/p-317622531483.html

http://struts.apache.org/2.3.8/docs/testing-actions.html

http://blog.csdn.net/xiemk2005/article/details/6003929

http://blog.csdn.net/yunzhongfeiniao/article/details/6926194