参考资料： 

 

Java注解（Annotation）原理详解

http://blog.csdn.net/lylwo317/article/details/52163304

http://www.cnblogs.com/xiaoluo501395377/p/3383130.html

http://www.cnblogs.com/flyoung

2008/archive/2013/08/11/3251148.html

http://blog.csdn.net/heyutao007/article/details/49738887