AspectJ annotation Development AOP: learning post notice

After returning advice to use @AfterReturing 

It can get our method's return value

The method can be defined by returning the return value of the attribute, as a parameter

Rear notice substantially used as follows:

There follows the ApplicationContex.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"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd">
        <!--开启aspectJ的注解开发，AspectJ的自动代理-->
        <aop:aspectj-autoproxy/>


        <!- <->the target class
        bean id="xiaomao" class="com.AspecJ.xiaomaoDao"></bean>

        <!--切面类-->
        <bean class="com.AspecJ.aspectj"/>


</beans>

 

There follows the target class:

package com.AspecJ;

public class xiaomaoDao {
    public void save(){
        System.out.println("save xiaomao!");
    }
    public void find(){
        System.out.println("find xiaomao!");
    }
    public String delete(){
        System.out.println("delete xiaomao!");
        return "xiaomao";
    }
    public void update(){
        System.out.println("update xiaomao!");
    }
}

 

In the aspect class is defined as follows:

 

package com.AspecJ;


import org.aspectj.lang.annotation.AfterReturning;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;

@Aspect
public class aspectj {
//    @Before(value = "execution(* com.AspecJ.xiaomaoDao.*(..))")
//    public void before(){
//        System.out.println("我是前置通知！");
//    }


    @AfterReturning(value = "execution(* com.AspecJ.xiaomaoDao.delete())",returning = "element")
//    使用returning来接受返回值
    public void After(Object element){
        System.out.println ("I removed the" + Element); // print out the return value 
    } 
}

Finally, the return value is as follows

I notice is the front! 
xiaomao the Delete ! 
I deleted xiaomao 
I notice is the front! 
xiaomao the Find ! 
I was before advice! 
xiaomao the Save ! 
I notice is the front! 
xiaomao Update !