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();
     }

 }