AspectJ实现AOP五大通知类型

1：配置所需的架包

 <dependencies>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>5.3.13</version>
        </dependency>
        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjweaver</artifactId>
            <version>1.8.7</version>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.13.2</version>
            <scope>test</scope>
        </dependency>
    </dependencies>

2：配置（applicationContext.xml）文件

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
     http://www.springframework.org/schema/beans/spring-beans.xsd
     http://www.springframework.org/schema/context
     http://www.springframework.org/schema/context/spring-context.xsd
     http://www.springframework.org/schema/aop
     http://www.springframework.org/schema/aop/spring-aop.xsd">
<!--    包扫描-->
    <context:component-scan base-package="com.javacto"></context:component-scan>
<!--    开启aop注解配置-->
    <aop:aspectj-autoproxy></aop:aspectj-autoproxy>
    </beans>

3：创建如下包以及类

4：创建（UserDao.java）类

package com.javacto.dao;

import org.springframework.stereotype.Repository;

@Repository
public class UserDao {
    public void add(){
        System.out.println("用户增加");
    }
    public void delete(){
        System.out.println("用户删除");
    }
    public void update(){
        System.out.println("修改数据");
    }
    public void findAll(int id){
        System.out.println("查询数据");
        int a = 10/0;
        System.out.println(a);
    }
}

5：编写通知类

package com.javacto;

import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.*;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
@Aspect
@Component
public class MyAspectJAdvice {
//    后置通知
    @AfterReturning("execution(* com.javacto.dao.UserDao.*(..))")
    public void myAfterReturing(){
        System.out.println("打印日志....");
    }
//    前置通知
    @Before("execution(* com.javacto.dao.UserDao.*(..))")
    public void myBefore(){
        System.out.println("前置通知");
    }
//    异常通知
    @AfterThrowing(value = "execution(* com.javacto.dao.UserDao.*(..))",throwing = "e")
    public void myAfterThrowing(Exception e){
        System.out.println("异常通知");
        System.out.println(e.getMessage());
    }
//    最终通知
    @After("execution(* com.javacto.dao.UserDao.*(..))")
    public void myAfter(){
        System.out.println("最终通知");
    }
//    环绕通知
    @Around("execution(* com.javacto.dao.UserDao.*(..))")
    public Object myAround(ProceedingJoinPoint proceedingJoinPoint) throws Throwable {
        System.out.println("通知前");
        Object obj = proceedingJoinPoint.proceed();
        System.out.println("通知后");
        return obj;
    }
}