Spring AOP pointcut的 this target within的区别

本文内容纲要：Spring AOP pointcut的 this target within的区别

Vehicle 接口

VehicleImp 实现类

Main函数调用.

Vehicle v1 = (Vehicle)context.getBean("vehicleimp");

v1.drive();

<aop:pointcut id="pointcut-pose" expression="execution(* *..drive()) and this(VehicleImp) "/> 匹配不到

<aop:pointcut id="pointcut-pose" expression="execution(* *..drive()) and this(Vehicle) "/> 匹配到

<aop:pointcut id="pointcut-pose" expression="execution(* *..drive()) and target(VehicleImp) "/> 匹配到

<aop:pointcut id="pointcut-pose" expression="execution(* *..drive()) and target(Vehicle) "/> 匹配到

<aop:pointcut id="pointcut-pose" expression="execution(* *..drive()) and within(VehicleImp) "/> 匹配到

<aop:pointcut id="pointcut-pose" expression="execution(* *..drive()) and within(Vehicle) "/> 匹配不到

<aop:pointcut id="pointcut-pose" expression="execution(* *..drive()) and within(Vehicle+) "/> 匹配到

说明:

1.this(VehicleImp)匹配不到,因为context.getBean()获得的对象v1是个被包装过的代理对象.不是VehicleImp类型. target(VehicleImp)能匹配到,匹配的是被代理的实际(VehicleImp)对象.

2.代理类型和被代理类型都符合接口Vehicle,this(Vehicle)和target(Vehicle)都能匹配到.

3.with和target的目标对象一样是实际被代理的对象(本文中VehicleImp).within不支持继承关系.所以within(Vehicle)没匹配到.可以使用+,within(Vehicle+)匹配.

总结:this是匹配代理后的包装过的对象, target和within匹配被代理原本的对象(vehicleimp).within不匹配继承关系.

本文内容总结：Spring AOP pointcut的 this target within的区别

原文链接：https://www.cnblogs.com/spelunky/p/spring-aop-this-target-within.html