一、Springsecurity的jar下载地址：
http://static.springsource.org/spring-security/site/downloads.html
二、Springsecurity处理原理：
1.demo：
http://www.cnblogs.com/sharpxiajun/archive/2011/09/27/2192442.html
http://www.cnblogs.com/sharpxiajun/archive/2011/09/27/2193570.html
2.进阶：
http://www.cnblogs.com/hzhuxin/archive/2011/12/14/2287363.html
http://www.cnblogs.com/hzhuxin/archive/2011/12/14/2287564.html
http://www.cnblogs.com/hzhuxin/category/342072.html
三、基于Springsecurity的登陆验证码:
http://kennylee26.iteye.com/blog/1473505