Copyright (c) 2013, Heng.Wang. All rights reserved. Some code in my spare time. @Author: Heng.Wang @Date : 08/05/2013 @Email : wangheng.wh@alibaba-inc.com king_wangheng@163.com wangheng.king@gmail.com @Github: https://github.com/HengWang/ @Blog : http://hengwang.blog.chinaunix.net All of the code is written in my spare time.