Spring学习笔记（5）- 注解方式 AOP

1.注解配置业务类

使用@Component("s") 注解ProductService 类

package com.jd.service;

import org.springframework.stereotype.Component;

@Component("s")
public class ProductService {
    public void doSomeService(){
        System.out.println("doSomeService");
    }
}

2.注解配置切面

@Aspect 注解表示这是一个切面
@Component 表示这是一个bean,由Spring进行管理
@Around(value = "execution(* com.jd.service.ProductService.*(..))") 表示对com.jd.service.ProductService 这个类中的所有方法进行切面操作

package com.jd.aspect;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.springframework.stereotype.Component;

@Aspect
@Component
public class LoggerAspect {

    @Around(value = "execution(* com.jd.service.ProductService.*(..))")
    public  Object log(ProceedingJoinPoint joinPoint) throws Throwable{
        System.out.println("start log:" + joinPoint.getSignature().getName());
        Object object = joinPoint.proceed();
        System.out.println("end log:" + joinPoint.getSignature().getName());
        return object;
    }
}

3.spring-config.xml

去掉原有信息，添加如下3行
扫描包com.jd.aspect和com.jd.service，定位业务类和切面类
<context:component-scan base-package="com.jd.aspect"/>
<context:component-scan base-package="com.jd.service"/>
找到被注解了的切面类，进行切面配置
<aop:aspectj-autoproxy/>

<?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"
       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 http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd">

    <context:component-scan base-package="com.jd.aspect"/>
    <context:component-scan base-package="com.jd.service"/>
    <aop:aspectj-autoproxy/>

</beans>

4.运行测试

(testString.java 测试运行代码见上节)