http://www.cnblogs.com/MuyouSome/archive/2013/05/05/3061636.htmlhttp://www.cnblogs.com/joeblackzqq/archive/2011/03/16/1986502.htmlhttp://www.cnblogs.com/xmphoenix/archive/2011/03/21/1989944.htmlhttp://www.cnblogs.com/god_like_donkey/archive/2009/10/26/1590049.html原文：http://blog.csdn.net/ieczw/article/details/20235121