http://elicer.iteye.com/blog/1851718
http://haohaoxuexi.iteye.com/blog/2113728
http://www.ibm.com/developerworks/cn/java/j-lo-spring25-ioc/
http://haohaoxuexi.iteye.com/blog/1188161
http://haohaoxuexi.iteye.com/blog/2123030
http://www.cnblogs.com/hoojo/archive/2012/07/12/2587556.html