摘自：
http://www.cnblogs.com/hongwz/p/5764917.html
对如下概念解释比较透彻：
1、横切关注点：（不是spring中定义的对象）
2、切面（Aspect）
3、连接点（不是spring中定义的对象）
4、切入点
5、通知
6、目标对象（不是spring中定义的对象）
7、织入（不是spring中定义的对象）
8、引入（不是spring中定义的对象）
http://www.cnblogs.com/superjt/p/4275293.html
http://www.cnblogs.com/duanxz/p/3750845.html
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http://www.cnblogs.com/dfdi33/p/5017362.html