1. http://blog.csdn.net/jaune161/article/details/25602655
2. http://wcp88888888.iteye.com/blog/1399301
3. http://stupidbirds.iteye.com/blog/1495695
4. http://blog.csdn.net/lzwjavaphp/article/details/14224899
原文：http://www.cnblogs.com/dragonflyyi/p/3940342.html