Spring的AOP快速实现通用日志打印

1.三个核心包

1.1spring-aop：AOP核心功能，例如代理工厂（已存在包含在下面这个包里）

1.2aspectjweaver：简单理解，支持切入点表达式

 	<dependency>
            <groupId>org.aspectjgroupId>
            <artifactId>aspectjweaverartifactId>
            <version>1.6.11version>
        dependency>

1.3aspectjrt：简单理解，支持aop相关注解（被上边的包包含）

2.定义service接口和实现类

接口：VideoService

public interface VideoService {
    int save(Video video);
    Video findById(int id);
}

实现类：VideoServiceImpl

public class VideoServiceImpl implements VideoService {
    public int save(Video video) {
        System.out.println("保存Video");
        return 1;
    }

    public Video findById(int id) {
        System.out.println("根据id找视频");
        return new Video();
    }
}

3.定义横切关注点

public class TimeHandler {
    public void printBefore(){
        System.out.println("printBefore 日志 time ="+ LocalDateTime.now().toString());
    }

    public void  printAfter(){
        System.out.println("printAfter 日志 time ="+ LocalDateTime.now().toString());
    }
}

4.在applicationContex.xmlt添加schema

<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
            https://www.springframework.org/schema/beans/spring-beans.xsd
            http://www.springframework.org/schema/aop
            http://www.springframework.org/schema/aop/spring-aop-4.2.xsd"
       xmlns:aop="http://www.springframework.org/schema/aop"
>

5.配置bean和aop

	<bean id="timehandler" class="work.yspan.sp.aop.TimeHandler"/>
    <bean id="videoService" class="work.yspan.sp.service.VideoServiceImpl"/>

    
    <aop:config>
        
        <aop:aspect id="timeAspect" ref="timehandler">

            
            <aop:pointcut id="allMethodPointCut" expression="execution(* work.yspan.sp.service.VideoService.*(..))"/>
            

            
            <aop:before method="printBefore" pointcut-ref="allMethodPointCut"/>
            <aop:after method="printAfter" pointcut-ref="allMethodPointCut"/>
        aop:aspect>
    aop:config>

6.测试代码

 public static void main(String[] args){
        ApplicationContext applicationContext=new ClassPathXmlApplicationContext("applicationContext.xml");
        testaop(applicationContext);
    }
 private static void  testaop(ApplicationContext applicationContext){
        VideoService videoService=(VideoService)applicationContext.getBean("videoService");
        videoService.save(new Video());
        videoService.findById(263);
    }

测试效果截图：

7.改变aop配置 pointcut 的expression

效果截图：（只切入了Video）