1.导包：

2.目标类

package oyb.service;

public interface UserService {
    public void add();
    public void update();
    public void delete();
}

package oyb.service.impl;

import oyb.service.UserService;

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

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

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

切面类

package oyb.aspect;

import org.aopalliance.intercept.MethodInterceptor;
import org.aopalliance.intercept.MethodInvocation;

public class MyAspect implements MethodInterceptor {
    @Override
    public Object invoke(MethodInvocation methodInvocation) throws Throwable {
        //放行
        Object obj = methodInvocation.proceed();
        return obj;
    }
}

Spring的配置文件

<?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:context="http://www.springframework.org/schema/context"
       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">
    <!--业务类-->
    <bean id="userService" class="oyb.service.impl.UserServiceImpl"></bean>

    <!--切面类-->
    <bean id="myAspect" class="oyb.aspect.MyAspect"></bean>

    <!--使用工厂bean创建代理-->
    <bean id="proxyFactory" class="org.springframework.aop.framework.ProxyFactoryBean">

        <!--interfaces,确定接口，多个接口用array,单个接口用value-->
        <property name="interfaces" value="oyb.service.UserService"></property>
        <!--确定目标类，-->
        <property name="target" value="userService"></property>
        <!--通知，切面类，他是一个数组-->
        <property name="interceptorNames" value="myAspect"></property>

        <!--使用cglib代理-->
        <!--默认使用jdk,如果声明为true的话，不论有没有接口都使用cglib代理-->
        <property name="optimize" value="true"></property>
    </bean>
</beans>