http://www.cs.cf.ac.uk/Dave/Multimedia/node141.html
http://www.cnblogs.com/laughterwym/archive/2006/06/23/433793.html
http://www.cs.cf.ac.uk/Dave/Multimedia/node141.html
http://www.cnblogs.com/laughterwym/archive/2006/06/23/433793.html
## spring security https://github.com/jitwxs/blog-sample/tree/master
https://blog.csdn.net/zhuizhufanxin123/article/details/103982940