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http://www.cnblogs.com/zhengyuhong/p/3485792.html

http://www.cnblogs.com/liping13599168/archive/2011/03/31/2000320.html

http://m.blog.csdn.net/blog/zh01085105/19414075

http://blog.csdn.net/hw_henry2008/article/details/6439128

http://www.cnblogs.com/zhoug2020/archive/2012/05/23/2514215.html

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原文地址：http://www.cnblogs.com/stemon/p/4523616.html