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http://www.cnblogs.com/hoholuo/archive/2011/12/17/2290873.html

 

http://www.cnblogs.com/niuww/archive/2013/04/09/3010266.html

 

http://blog.csdn.net/zhoufoxcn/article/details/6404236

 

http://www.cnblogs.com/xiaofengfeng/archive/2013/06/19/3144046.html