设计方式-proxy

设计模式-proxy

Spring的Aop和?Struts个拦截器，动态代理模式就是执行某方法，之前或之后干些什么！！！
首先是简单的Aspect接口

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public?interface?Student?{ ??????public?void?sayHello(); ?? } ????import?org.aspect.Aspect; ?? ??public?class?StudentAspectOne?implements?Aspect?{ ?? ??????@Override?? ????public?void?doAfter()?{ ?? ????????System.out.println("do?After?One"); ?? ???????? ??????} ????????@Override?? ????public?void?doBefore()?{ ?? ????????System.out.println("do?Before?One"); ?? ???????? ??????} ????} ????import?org.aspect.Aspect; ?? ????public?class?StudentAspectTwo?implements?Aspect{ ?? ????@Override?? ????public?void?doAfter()?{ ?? ????????System.out.println("do?After?Two"); ?? ???????? ??????} ????????@Override?? ????public?void?doBefore()?{ ?? ????????System.out.println("do?Before?Two"); ?? ???????? ??????} ??} ????public?class?StudentImpl?implements?Student?{ ?? ??????@Override?? ????public?void?sayHello()?{ ?? ????????System.out.println("Student"); ?? ????} ????} ????import?java.util.ArrayList; ?? import?java.util.List; ?? ??import?org.aspect.Aspect; ?? import?org.aspect.DynamicProxyFactory; ?? ??public?class?Test?{ ?? ??????public?static?void?main(String[]?args)?{ ?? ???????? ??????????List<Aspect>?aspectList?=?new?ArrayList<Aspect>(); ?? ???????? ??????????aspectList.add(new?StudentAspectOne()); ?? ????????aspectList.add(new?StudentAspectTwo()); ?? ????????Student?s?=?(Student)DynamicProxyFactory.newInstance(new?StudentImpl(),?aspectList); ?? ????????s.sayHello(); ??????} ????}??



执行Test，控制台返回

do Before One
do Before Two
Student
do After Two
do After One