Spring AOP使用整理:自动代理以及AOP命令空间

三、自动代理的实现

1、使用BeanNameAutoProxyCreator

　　通过Bean的name属性自动生成代理Bean。

<bean class="org.springframework.aop.framework.autoproxy.BeanNameAutoProxyCreator">
    <property name="beanNames">
        <list>
            <value>*Target</value> <!-- 名字以Target结尾的bean将被拦截 -->
        </list>
    </property>
    <property name="interceptorNames">
        <list>
            <value>personAroundAdvice</value>
        </list>
    </property>
 </bean>

2、使用DefaultAdvisorAutoProxyCreator

DefaultAdvisorAutoProxyCreator允许我们只需定义相应的Advisor通知者，就可以完成自动代理。配置好DefaultAdvisorAutoProxyCreator受管Bean后，它会自动查找配置文件中定义的Advisor，并将它们作用于所有的Bean。

Spring提供了以下通知者：

RegexpMethodPointcutAdvisor

NameMatchMethodPointcutAdvisor

<bean class="org.springframework.aop.framework.autoproxy.DefaultAdvisorAutoProxyCreator"/>

<bean id="nameMatchMethodPointcutAdvisor" class="org.springframework.aop.support.NameMatchMethodPointcutAdvisor">
    <property name="advice" ref="personAroundAdvice"/>
    <property name="mappedNames">
        <list>
            <value>*info*</value>
        </list>
    </property>
</bean>

3、测试代码

ApplicationContext context = new FileSystemXmlApplicationContext("classpath:com/cjm/aop/beans.xml");
Person p = (Person)context.getBean("personTarget");  //此处获取的是具体的Bean，而不是代理Bean
p.info();

四、基于aop命名空间的AOP

1、切面类MyAspect的源码

public class MyAspect {
    public void BeforeAdvice(JoinPoint point){
        PersonImpl p = (PersonImpl)point.getTarget();
    }

    public void AfterAdvice(JoinPoint point){
        PersonImpl p = (PersonImpl)point.getTarget();
    }

    public void AfterReturningAdvice(Object retValue){
        System.out.println(retValue);
    }

    public void AroundAdvice(ProceedingJoinPoint point)throws Throwable{
        System.out.println("AroundAdvice >> 目标对象 前");
        point.proceed(point.getArgs());
        System.out.println("AroundAdvice >> 目标对象 后");
    }

    public void ThrowingAdvice(Throwable throwing)throws Throwable{
        System.out.println(throwing);
    }
}

2、配置

<!-- 切面受管Bean -->
<bean id="myAspect" class="com.cjm.aop.MyAspect"/>

<aop:config proxy-target-class="true">
    <!-- 声明一个切面 -->
    <aop:aspect ref="myAspect" order="0">
        <!-- 声明一个切入点 -->
        <aop:pointcut id="pointcut1" expression="execution(* com.cjm.aop..*(..))"/>

        <!-- 声明通知 -->
        <aop:before pointcut-ref="pointcut1" method="BeforeAdvice"/>
        <aop:after pointcut-ref="pointcut1" method="AfterAdvice"/>
        <aop:after-returning pointcut-ref="pointcut1" method="AfterReturningAdvice" returning="retValue"/>
        <aop:around pointcut-ref="pointcut1" method="AroundAdvice"/>
        <aop:after-throwing pointcut-ref="pointcut1" method="ThrowingAdvice" throwing="throwing"/>
    </aop:aspect>
</aop:config>