Spring AOP 方式一:使用Spring的API接口

Spring AOP
学习来源:遇见狂神说

        
            org.springframework
            spring-webmvc
            5.3.21
        

        
            org.springframework
            spring-jdbc
            5.3.21
        

        
            org.projectlombok
            lombok
            1.18.24
            provided
        

        
            junit
            junit
            4.13.2
            test
        

        
            org.aspectj
            aspectjweaver
            1.9.4
        

被代理的接口方法

package com.wang.service;

public interface UserService {
    public void add();

    public void delete();

    public void update();

    public void select();
}

执行接口方法的类

package com.wang.service;

public class UserServiceImpl implements UserService{
    @Override
    public void add() {
        System.out.println("增加用户");
    }

    @Override
    public void delete() {
        System.out.println("删除用户");
    }

    @Override
    public void update() {
        System.out.println("更新用户");
    }

    @Override
    public void select() {
        System.out.println("查询用户");
    }
}

前置日志

package com.wang.log;

import org.springframework.aop.MethodBeforeAdvice;

import java.lang.reflect.Method;

public class Log implements MethodBeforeAdvice {

    
    @Override
    public void before(Method method, Object[] args, Object target) throws Throwable {
        System.out.println(target.getClass().getName()+"的"+method.getName()+"被执行了");
    }
}

后置日志

package com.wang.log;

import org.springframework.aop.AfterReturningAdvice;

import java.lang.reflect.Method;

public class AfterLog implements AfterReturningAdvice {

    
    @Override
    public void afterReturning(Object returnValue, Method method, Object[] args, Object target) throws Throwable {
        System.out.println("执行了"+method.getName()+",返回结果为:"+returnValue);
    }
}

applicationContext.xml

测试类

import com.wang.service.UserService;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class MyTest {
    @Test
    public void Test() {
        ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
        
        //动态代理代理的是接口,返还的也得是接口,而不能是UserServiceImpl
        UserService userService = (UserService) context.getBean("userServiceImpl");
        
        userService.add();
    }
}

执行结果