14Spring_AOP编程(AspectJ)_环绕通知

在目标方法执行前后，进行代码增强 （阻止目标方法的执行 ）

环绕通知实现任何通知效果。

案例如下：

案例结构：

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" alt="" />

第一步：编写代理类。

MyAspect.java

	//这里必须要抛异常
	public Object around( ProceedingJoinPoint proceedingJoinPoint) throws Throwable
	{
		System.out.print("环绕通知 方法前执行");
		Object result=proceedingJoinPoint.proceed();
		System.out.print("环绕通知 方法后执行");
		return result;
 
	}

第二步：写ApplicationContext.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xmlns:tx="http://www.springframework.org/schema/tx"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
                           http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
                           http://www.springframework.org/schema/aop
                           http://www.springframework.org/schema/aop/spring-aop-2.5.xsd
                           http://www.springframework.org/schema/context
                           http://www.springframework.org/schema/context/spring-context-2.5.xsd
                           http://www.springframework.org/schema/tx
                           http://www.springframework.org/schema/tx/spring-tx-2.5.xsd">
     <bean id="OrderService" class="cn.itcast.spring.c_aop.impl.OrderServiceimpl" />
 
<!-- AspectJ AOP -->
<!-- 配置目标 -->
<bean id="CustomerService" class="cn.itcast.spring.d_aspectj.CustomerService"></bean>
 <!-- 配置切面类 -->
<bean id="MyAspect" class="cn.itcast.spring.d_aspectj.MyAspect"></bean>
 <aop:config>
 <!-- ref引用切面类 -->
 <aop:aspect ref="MyAspect">
 
     <aop:pointcut expression="execution(* cn.itcast.spring.d_aspectj.CustomerService.*(..))" id="mypointcut2"/>
 
    <aop:around method="around" pointcut-ref="mypointcut2"/>
 
 </aop:aspect>
 
</aop:config>
 
</beans>

第三步 写Junit测试的代码：

	@Test
	public void testaround()
	{
 
		customerService.delete();
 
	}

第四步  输出结果：

环绕通知 方法前执行
this is delete
环绕通知 方法后执行