http://www.cnblogs.com/zhchongyao/archive/2010/12/28/1919176.html
http://blog.csdn.net/weiren2006/article/details/6842807
http://download.csdn.net/detail/negotiate/4441229
http://blog.csdn.net/lpt19832003/article/category/503989/1
原文：http://www.cnblogs.com/lingzhihua/p/4863653.html