<dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjweaver</artifactId>
            <version>1.9.4</version>    
        </dependency>

package com.ly.service;

public interface UserService {
    public void add();
    public void del();
    public void update();
    public void select();
}

<?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
">

    <bean id="userService" class="com.ly.service.UserServiceImpl"/>
    <bean id="log" class="com.ly.log.Log"/>
    <bean id="afterLog" class="com.ly.log.AfterLog"/>

    <!--方式一、使用原生的Spring Api接口-->
    <!--配置aop：需要导入aop的约束-->
    <aop:config>
        <!--切入点,expression：表达式，execution(要执行的位置)-->
        <aop:pointcut id="pointcut" expression="execution(* com.ly.service.UserServiceImpl.*(..))"/>
        <!--执行环绕增加-->
        <aop:advisor advice-ref="log" pointcut-ref="pointcut"/>
        <aop:advisor advice-ref="afterLog" pointcut-ref="pointcut"/>
    </aop:config>
</beans>

package com.ly.service;

public class UserServiceImpl implements UserService {
    public void add() {
        System.out.println("增加了一个用户");
    }

    public void del() {
        System.out.println("删除了一个用户");
    }

    public void update() {
        System.out.println("修改了一个用户");
    }

    public void select() {
        System.out.println("选择了一个用户");
    }

}

package com.ly.log;

import org.springframework.aop.MethodBeforeAdvice;

import java.lang.reflect.Method;

public class Log  implements MethodBeforeAdvice {
    //method:要执行的目标对象的方法
    //args：参数
    //target“目标对象
    public void before(Method method, Object[] args, Object target) throws Throwable {
        System.out.println(target.getClass().getName()+"的"+method.getName()+"被执行了");

    }
}

package com.ly.log;

import org.springframework.aop.AfterReturningAdvice;

import java.lang.reflect.Method;

public class AfterLog implements AfterReturningAdvice {
   //returnvalue：返回值
    public void afterReturning(Object returnvalue, Method method, Object[] args, Object target) throws Throwable {
        System.out.println("执行了"+method.getName()+"返回的结果为"+returnvalue);
    }
}

import com.ly.service.UserService;
import com.ly.service.UserServiceImpl;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class MyTest {
    public static void main(String[] args) {
        ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("ApplicationContext.xml");
        //**********动态代理代理的是一类接口*************
        UserService userService = (UserService) context.getBean("userService");
        userService.add();
        userService.del();
    }
}

package com.ly.diy;

public class DiyPointCut {
    public void before(){
        System.out.println("---执行前---");
    }
    public void after(){
        System.out.println("---执行后---");
    }
}

<?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
">

    <bean id="userService" class="com.ly.service.UserServiceImpl"/>
    <bean id="log" class="com.ly.log.Log"/>
    <bean id="afterLog" class="com.ly.log.AfterLog"/>

    <!--方式一、使用原生的Spring Api接口-->
    <!--配置aop：需要导入aop的约束-->
    <!--<aop:config>
        &lt;!&ndash;切入点,expression：表达式，execution(要执行的位置)&ndash;&gt;
        <aop:pointcut id="pointcut" expression="execution(* com.ly.service.UserServiceImpl.*(..))"/>
        &lt;!&ndash;执行环绕增加&ndash;&gt;
        <aop:advisor advice-ref="log" pointcut-ref="pointcut"/>
        <aop:advisor advice-ref="afterLog" pointcut-ref="pointcut"/>
    </aop:config>-->


    <!--方式二：自定义类-->
    <bean id="diy" class="com.ly.diy.DiyPointCut"/>
        <aop:config>
            <!--自定义切面，ref要引用类-->
            <aop:aspect ref="diy">
                <!--切入点-->
                <aop:pointcut id="point" expression="execution(* com.ly.service.UserServiceImpl.*(..))"/>

                <!--通知-->
                <aop:before method="before" pointcut-ref="point"/>
                <aop:after method="after" pointcut-ref="point"/>
            </aop:aspect>
        </aop:config>

</beans>

package com.ly.diy;

//方式三 使用注解实现AOP

import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.After;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;

@Aspect
public class AnnotationPointCut {
    @Before("execution(* com.ly.service.UserServiceImpl.*(..))")
    public void before(){
        System.out.println("方法执行之前");
    }
    @After("execution(* com.ly.service.UserServiceImpl.*(..))")
    public void after(){
        System.out.println("方法执行之后");
    }
    //在环绕增强中，我们可以给定一个参数，代表我们要获取处理切入的点
    @Around("execution(* com.ly.service.UserServiceImpl.*(..))")
    public void around(ProceedingJoinPoint jp) throws Throwable {
        System.out.println("环绕前");

        //执行方法
        Object proceed = jp.proceed();

        System.out.println("环绕后");
    }

}

<bean id="annotationPointCut" class="com.ly.diy.AnnotationPointCut"/>
<aop:aspectj-autoproxy/>