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<aop:aspectj-autoproxy proxy-target-class="false"/> 基于接口，使用JDK动态代理
JDK Dynamic proxy can only proxy by interface (so your target class needs to implement an interface, which will also be implemented by the proxy class).
<aop:aspectj-autoproxy proxy-target-class="true"/> 基于类，需要使用cglib库
CGLIB (and javassist) can create a proxy by subclassing. In this scenario the proxy becomes a subclass of the target class. No need for interfaces.
Note：
这两种代理方式的使用使用了 策略模式 。