Spring AOP 方式二:自定义来实现AOP

Spring AOP
学习来源:遇见狂神说
1.

package com.wang.diy;

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

execution表达式转载:http://t.csdn.cn/CSZa7
2.

<?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
        https://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/aop
        https://www.springframework.org/schema/aop/spring-aop.xsd">
    <!--    注册bean-->
    <bean id="userServiceImpl" class="com.wang.service.UserServiceImpl"/>
    <bean id="log" class="com.wang.log.Log"/>
    <bean id="afterLog" class="com.wang.log.AfterLog"/>


<!--    方式二:自定义类-->
    <bean id="diy" class="com.wang.diy.DiyPointCut"/>
    <aop:config>
<!--        自定义切面,ref引入的类-->
        <aop:aspect ref="diy">
<!--            切入点-->
            <aop:pointcut id="pointcut" expression="execution(* com.wang.service.UserServiceImpl.*(..))"/>
<!--            通知 -->
            <aop:before method="before" pointcut-ref="pointcut"/>
            <aop:after-returning method="after" pointcut-ref="pointcut"/>
        </aop:aspect>
    </aop:config>
</beans>

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();
    }
}