基于xml配置方式的AOP

1. 实现步骤  115

1.1 第一步：编写目标类

package com.powernode.spring6.service;

/**
 * 基于xml配置方式的AOP  115
 **/
public class UserService {//目标对象
    public void logout(){ //目标方法
        System.out.println("系统正在安全退出...");
    }
}

1.2  第二步：编写切面类，并且编写通知

package com.powernode.spring6.service;

import org.aspectj.lang.ProceedingJoinPoint;

/**
 * 切面
 * 基于xml配置方式的AOP  115
 **/
public class TimerAspect {

    // 通知
    public void aroundAdvice(ProceedingJoinPoint joinPoint) throws Throwable {
        // 前环绕
        long begin = System.currentTimeMillis();
        // 目标
        joinPoint.proceed();
        // 后环绕
        long end = System.currentTimeMillis();
        System.out.println("耗时"+(end - begin)+"毫秒");
    }
}

1.3 第三步：编写spring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"
       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/context http://www.springframework.org/schema/context/spring-context.xsd
                           http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd">

    <!--纳入spring ioc-->
    <bean id="userService" class="com.powernode.spring6.service.UserService"></bean>
    <bean id="timerAspect" class="com.powernode.spring6.service.TimerAspect"></bean>

    <!--aop的配置-->
    <aop:config>
        <!--切点表达式-->
        <aop:pointcut id="mypointcut" expression="execution(* com.powernode.spring6.service..*(..))" />
        <!--切面:通知 + 切点-->
        <aop:aspect ref="timerAspect">
            <aop:around method="aroundAdvice" pointcut-ref="mypointcut"/>
        </aop:aspect>
    </aop:config>

</beans>

1.4 测试程序：

package com.powernode.spring6.test;

import com.powernode.spring6.service.UserService;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

/**
 * 基于xml配置方式的AOP  115
 * 测试
 **/
public class SpringAOPTest {

    @Test
    public void testXml(){
        ApplicationContext applicationContext = new ClassPathXmlApplicationContext("spring.xml");
        UserService userService = applicationContext.getBean("userService", UserService.class);
        userService.logout();
    }
}