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http://www.bubuko.com/infodetail-402899.html
http://www.jb51.net/article/50047.htm
http://www.cnblogs.com/funsion/p/4017779.html
http://www.cnblogs.com/suredandan/archive/2012/09/20/2696124.html
http://www.cnblogs.com/li1111xin/p/4775240.html
http://blog.csdn.net/lmh12506/article/details/7908605