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http://www.cnblogs.com/tangbinblog/archive/2012/07/30/2614925.html
http://blog.csdn.net/ithomer/article/details/7529022
http://blog.csdn.net/dengsilinming/article/details/8000622
http://blog.csdn.net/snsn1984/article/details/8610232
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原文地址:http://www.cnblogs.com/chris-cp/p/4888593.html