Spring - AOP之AspectJ（注解）

Ps：访问修饰符，可有可无。

Ps：当然 JoinPoint 形参当中也可以去掉的。

Ps：around方法返回值为 Object 是因为针对目标方法如果有返回值的情况。

package com.imooc.aspectJ.demo1;

public class ProductDao {

    public void save(){
        System.out.println("保存商品...");
    }

    public String update(){
        System.out.println("修改商品...");
        return "hello";
    }

    public void delete(){
        System.out.println("删除商品...");
    }

    public void findOne(){
        System.out.println("查询一个商品...");
        //int i = 1/0;
    }

    public void findAll(){
        System.out.println("查询所有商品...");
//        int j = 1/0;
    }

}

package com.imooc.aspectJ.demo1;

import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.*;

/**
 * 切面类
 */
@Aspect
public class MyAspectAnno {

    @Before(value="myPointcut1()")
    public void before(JoinPoint joinPoint){
        System.out.println("前置通知=================="+joinPoint);
    }

    @AfterReturning(value="myPointcut2()",returning = "result")
    public void afterReturing(Object result){
        System.out.println("后置通知=================="+result);
    }

    @Around(value="myPointcut3()")
    public Object around(ProceedingJoinPoint joinPoint) throws Throwable {
        System.out.println("环绕前通知================");
        Object obj = joinPoint.proceed(); // 执行目标方法
        System.out.println("环绕后通知================");
        return obj;
    }

    @AfterThrowing(value="myPointcut4()",throwing = "e")
    public void afterThrowing(Throwable e){
        System.out.println("异常抛出通知=============="+e.getMessage());
    }

    @After(value="myPointcut5()")
    public void after(){
        System.out.println("最终通知==================");
    }

    @Pointcut(value="execution(* com.imooc.aspectJ.demo1.ProductDao.save(..))")
    private void myPointcut1(){}

    @Pointcut(value="execution(* com.imooc.aspectJ.demo1.ProductDao.update(..))")
    private void myPointcut2(){}

    @Pointcut(value="execution(* com.imooc.aspectJ.demo1.ProductDao.delete(..))")
    private void myPointcut3(){}

    @Pointcut(value="execution(* com.imooc.aspectJ.demo1.ProductDao.findOne(..))")
    private void myPointcut4(){}

    @Pointcut(value="execution(* com.imooc.aspectJ.demo1.ProductDao.findAll(..))")
    private void myPointcut5(){}

}

<?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，自动代理-->
    <aop:aspectj-autoproxy/>

    <!--目标类-->
    <bean id="productDao" class="com.imooc.aspectJ.demo1.ProductDao"/>

    <!--定义切面-->
    <bean class="com.imooc.aspectJ.demo1.MyAspectAnno"/>
    
</beans>

package com.imooc.aspectJ.demo1;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
import javax.annotation.Resource;

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration("classpath:applicationContext.xml")
public class SpringDemo1 {

    @Resource(name="productDao")
    private ProductDao productDao;

    @Test
    public void demo1(){
        productDao.save();
        productDao.update();
        productDao.delete();
        productDao.findAll();
        productDao.findOne();
    }

}

运行结果：
前置通知==================execution(void com.imooc.aspectJ.demo1.ProductDao.save())
保存商品...
修改商品...
后置通知==================hello
环绕前通知================
删除商品...
环绕后通知================
查询所有商品...
最终通知==================
查询一个商品...