http://blog.youkuaiyun.com/liuwenbo0920/article/details/7290586/
http://blog.youkuaiyun.com/junshuaizhang/article/details/8526244
http://www.cnblogs.com/peida/archive/2013/04/24/3036689.html
http://www.cnblogs.com/peida/archive/2013/04/23/3036035.html
http://www.cnblogs.com/peida/archive/2013/04/26/3038503.html