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参考大神的博文:http://www.cnblogs.com/tornadomeet/archive/2012/06/02/2531565.html
http://www.cnblogs.com/tornadomeet/archive/2012/06/02/2531705.html
gmm
原文地址:http://www.cnblogs.com/573177885qq/p/4391725.html