SpringAOP的原生实现解析

除了AspectJ，Spring支持原生方式实现AOP
引入依赖

 
        
            org.springframework
            spring-aop
            5.3.18
        

编写通知类

package com.neu.advice;

import org.aopalliance.intercept.MethodInterceptor;
import org.aopalliance.intercept.MethodInvocation;
import org.springframework.aop.AfterReturningAdvice;
import org.springframework.aop.MethodBeforeAdvice;
import org.springframework.aop.ThrowsAdvice;

import java.lang.reflect.Method;


public class SpringAop implements MethodBeforeAdvice, AfterReturningAdvice, ThrowsAdvice, MethodInterceptor {

    
    @Override
    public Object invoke(MethodInvocation invocation) throws Throwable {
        System.out.println("环绕前");
        Object proceed = invocation.proceed();//目标方法
        System.out.println("环绕后");
        return proceed;
    }

    
    @Override
    public void afterReturning(Object returnValue, Method method, Object[] args, Object target) throws Throwable {
        System.out.println("后置通知");
    }

    @Override
    public void before(Method method, Object[] args, Object target) throws Throwable {
        System.out.println("前置通知");

    }

    
    public void afterThrowing(Exception ex){
        System.out.println("发生异常");
    }
}

Spring原生方式实现AOP时，只支持四种通知类型：

核心类

package com.neu.dao;

import org.springframework.stereotype.Component;
import org.springframework.stereotype.Repository;


@Repository
public class UserDao {
    public void add(){
        System.out.println("用户新增");
    }
    public void del(){
        System.out.println("用户删除");
    }
    public void update(){
        int i = 1/0;
        System.out.println("用户修改");
    }
}

编写配置类

    
    
    
    
    
        
        
        
        
            
                springAop
            
        
        
        
    

编写测试类

@Test
    public void testAdd(){
        ApplicationContext ac = new ClassPathXmlApplicationContext("bean2.xml");
        UserDao userDao = (UserDao) ac.getBean("userDaoProxy");
        userDao.add();
    }