Spring框架中的AOP技术----注解方式

利用AOP技术注解的方式对功能进行增强

CustomerDao接口

 package com.alphajuns.demo1;

 public interface CustomerDao {

     public void save();

     public void update();

 }

CustomerDaoImpl实现类

 package com.alphajuns.demo1;

 public class CustomerDaoImpl implements CustomerDao {

     @Override
     public void save() {
         System.out.println("保存客户...");
     }

     @Override
     public void update() {
         System.out.println("更新客户...");
     }

 }

切面类

 package com.alphajuns.demo1;

 import org.aspectj.lang.ProceedingJoinPoint;
 import org.aspectj.lang.annotation.After;
 import org.aspectj.lang.annotation.Around;
 import org.aspectj.lang.annotation.Aspect;
 import org.aspectj.lang.annotation.Before;
 import org.aspectj.lang.annotation.Pointcut;

 /*
  * 注解方式的切面类
  */
 @Aspect
 public class MyAspectAnno {

     /*
      * 前置通知
      */
     @Before(value="execution(public void com.alphajuns.demo1.CustomerDaoImpl.save())")
     public void log() {
         System.out.println("记录日志...");
     }

     /*
      * 后置通知
      */
     /*@After(value="execution(public void com.alphajuns.demo1.CustomerDaoImpl.save())")*/
     @After(value="MyAspectAnno.fn()")
     public void after() {
         System.out.println("更新日志...");
     }

     @Around(value="execution(public void com.alphajuns.demo1.CustomerDaoImpl.save())")
     public void around(ProceedingJoinPoint joinPoint) {
         System.out.println("环绕通知1...");
         try {
             joinPoint.proceed();
         } catch (Throwable e) {
             e.printStackTrace();
         }
         System.out.println("环绕通知2...");
     }

     /*
      * 自定义切入点
      */
     @Pointcut(value="execution(public * com.alphajuns.demo1.CustomerDaoImpl.save())")
     public void fn(){};

 }

测试类

 package com.alphajuns.demo1;

 import javax.annotation.Resource;

 import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.springframework.test.context.ContextConfiguration;
 import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

 @RunWith(SpringJUnit4ClassRunner.class)
 @ContextConfiguration("classpath:applicationContext.xml")
 public class Demo1 {

     @Resource(name="customerDao")
     private CustomerDao customerDao;

     @Test
     public void run1() {
         customerDao.save();
     }

 }

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"
     xmlns:tx="http://www.springframework.org/schema/tx"
     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
     http://www.springframework.org/schema/tx
     http://www.springframework.org/schema/tx/spring-tx.xsd">

     <!-- 开启自动代理 -->
     <aop:aspectj-autoproxy/>

     <!-- 创建目标对象 -->
     <bean id="customerDao" class="com.alphajuns.demo1.CustomerDaoImpl"/>

     <!-- 创建切面类 -->
     <bean id="myAspectAnno" class="com.alphajuns.demo1.MyAspectAnno"/>

 </beans>