Spring学习笔记5——注解方式AOP

 

第一步：注解配置业务类

　　使用@Component("Pservice")注解ProductService 类

package com.spring.service;

import org.springframework.stereotype.Component;

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

第二步：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.spring.service.ProductService.*(..))") 表示对com.spring.service.ProductService 这个类中的所有方法进行切面操作

package com.spring.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.spring.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;
    }
}

第三步：修改applicationContext.xml

去掉原有信息，添加如下3行

　　<1>扫描包com.spring.aspect和com.spring.service，定位业务类和切面类

<context:component-scan base-package="com.spring.aspect"/>
<context:component-scan base-package="com.spring.service"/>

　　<2>找到被注解了的切面类，进行切面配置

<aop:aspectj-autoproxy/> 

 

applicationContext.xml

<?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:tx="http://www.springframework.org/schema/tx"
    xmlns:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="
   http://www.springframework.org/schema/beans
   http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
   http://www.springframework.org/schema/aop
   http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
   http://www.springframework.org/schema/tx
   http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
   http://www.springframework.org/schema/context     
   http://www.springframework.org/schema/context/spring-context-3.0.xsd">
    <context:component-scan base-package="com.spring.aspect"/>
    <context:component-scan base-package="com.spring.service"/>
    <aop:aspectj-autoproxy/> 
</beans>

第四步：测试

package com.spring.test;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.spring.service.ProductService;

public class TestSpring {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        ApplicationContext context = new ClassPathXmlApplicationContext(new String[] { "applicationContext.xml" });
        ProductService s = (ProductService) context.getBean("Pservice");
        s.doSomeService();
    }

}