参考地址:http://blog.csdn.net/dqsweet/article/details/7276404
参考地址2:http://www.cnblogs.com/hxling/archive/2011/04/09/2010133.html
参考地址:http://blog.csdn.net/dqsweet/article/details/7276404
参考地址2:http://www.cnblogs.com/hxling/archive/2011/04/09/2010133.html