http://www.cnblogs.com/janet/archive/2010/04/24/1719315.html
http://www.cnblogs.com/poissonnotes/archive/2012/04/30/2476992.html
http://www.cnblogs.com/poissonnotes/archive/2012/04/30/2476992.html
http://blog.csdn.net/gdsongrenjun/article/details/6754166
http://blog.sina.com.cn/s/blog_5245a6580101fod3.html
看完就可以用状态机开发自己的审批流程了(审批页面自定义)