shiro核心

参考链接：http://www.cnblogs.com/skyme/archive/2011/09/12/2173979.html

http://www.cnblogs.com/skyme/archive/2011/09/12/2174201.html
http://peterwanghao.iteye.com/blog/1753542
http://blog.csdn.net/teamlet/article/category/1192625