spring 2.0 aop编程(一)(转载)

在spring2.0中，aop发生了很大的变化：
主要分为两大方面
1.支持简单的aop xml配置
2.支持@AspectJ的注释

先来看一看第一种情况：
申明一个aspect，在xml中的申明如下：

<aop:config>

  <aop:aspect id="myAspect" ref="aBean">

    ...

  </aop:aspect>

</aop:config>



<bean id="aBean" class="...">

  ...

</bean>



申明pointcut


<aop:config>

  <aop:pointcut id="businessService"

        expression="execution(* com.xyz.myapp.service.*.*(..))"/>

</aop:config>


申明advice


Before advice：

<aop:aspect id="beforeExample" ref="aBean">

    <aop:before

      pointcut-ref="dataAccessOperation"

      method="doAccessCheck"/>

</aop:aspect>

After returning advice:

<aop:aspect id="afterReturningExample" ref="aBean">



    <aop:after-returning

      pointcut-ref="dataAccessOperation"

      method="doAccessCheck"/>

         

    ...

   

</aop:aspect>

或者带有返回参数

<aop:aspect id="afterReturningExample" ref="aBean">



    <aop:after-returning

      pointcut-ref="dataAccessOperation"

      returning="retVal"

      method="doAccessCheck"/>

         

    ...

   

</aop:aspect>



After throwing advice：

<aop:aspect id="afterThrowingExample" ref="aBean">



    <aop:after-throwing

      pointcut-ref="dataAccessOperation"

      method="doRecoveryActions"/>

         

    ...

   

</aop:aspect>

或者带有throwing

<aop:aspect id="afterThrowingExample" ref="aBean">



    <aop:after-throwing

      pointcut-ref="dataAccessOperation"

      throwing="dataAccessEx"

      method="doRecoveryActions"/>

         

    ...

   

</aop:aspect>

After (finally) advice：

<aop:aspect id="afterFinallyExample" ref="aBean">



    <aop:after

      pointcut-ref="dataAccessOperation"

      method="doReleaseLock"/>

         

    ...

   

</aop:aspect>

Around advice：

<aop:aspect id="aroundExample" ref="aBean">



    <aop:around

      pointcut-ref="businessService"

      method="doBasicProfiling"/>

         

    ...

   

</aop:aspect>

Advice parameters：

<aop:before

  pointcut="Pointcuts.anyPublicMethod() and @annotation(auditable)"

  method="audit"

  arg-names="auditable"/>



对于引入接口（Introductions）：


<aop:aspect id="usageTrackerAspect" ref="usageTracking">

  <aop:declare-parents

      types-matching="com.xzy.myapp.service.*+",

      implement-interface="UsageTracked"
      default-impl=" service.tracking.DefaultUsageTracked"/>

  <aop:before

    pointcut="com.xyz.myapp.SystemArchitecture.businessService()

              and this(usageTracked)"

    method="recordUsage"/>

</aop:aspect>