http://www.iskei.cn/posts/53969.html

http://www.iskei.cn/posts/53969.html

https://docs.spring.io/spring-security/site/docs/3.1.x/reference/cas.html

https://docs.spring.io/spring-security/site/docs/3.1.x/reference/springsecurity-single.html#ns-session-mgmt

http://www.cnblogs.com/codestory/p/5512104.html