使用Spring的注解方式实现AOP

Spring对AOP的实现提供了很好的支持。下面我们就使用Spring的注解来完成AOP做一个例子。

首先，为了使用Spring的AOP注解功能，必须导入如下几个包。aspectjrt.jar,aspectjweaver.jar,cglib-nodep.jar.

然后我们写一个接口

package com.bird.service;public interface PersonServer {public void save(String name);public void update(String name, Integer id);public String getPersonName(Integer id);}
和一个接口实现类

package com.bird.service.impl;import com.bird.service.PersonServer;public class PersonServiceBean implements PersonServer{@Overridepublic void save(String name) {System.out.println("我是save方法");//throw new RuntimeException();}@Overridepublic void update(String name, Integer id) {System.out.println("我是update()方法");}@Overridepublic String getPersonName(Integer id) {System.out.println("我是getPersonName()方法");return "xxx";}}
下面使用Spring注解方式对这个Bean进行方法拦截

package com.bird.service;import org.aspectj.lang.ProceedingJoinPoint;import org.aspectj.lang.annotation.After;import org.aspectj.lang.annotation.AfterReturning;import org.aspectj.lang.annotation.AfterThrowing;import org.aspectj.lang.annotation.Around;import org.aspectj.lang.annotation.Aspect;import org.aspectj.lang.annotation.Before;import org.aspectj.lang.annotation.Pointcut;/** * 切面 * @author Bird * */@Aspectpublic class MyInterceptor {@Pointcut("execution(* com.bird.service.impl.PersonServiceBean.*(..))")private void anyMethod(){}//定义一个切入点@Before("anyMethod() && args(name)")public void doAccessCheck(String name){System.out.println(name);System.out.println("前置通知");}@AfterReturning("anyMethod()")public void doAfter(){System.out.println("后置通知");}@After("anyMethod()")public void after(){System.out.println("最终通知");}@AfterThrowing("anyMethod()")public void doAfterThrow(){System.out.println("例外通知");}@Around("anyMethod()")public Object doBasicProfiling(ProceedingJoinPoint pjp) throws Throwable{System.out.println("进入环绕通知");Object object = pjp.proceed();//执行该方法System.out.println("退出方法");return object;}}@Pointcut("execution(* com.bird.service.impl.PersonServiceBean.*(..))")这句话是方法切入点，execution为执行的意思，*代表任意返回值，然后是包名，.*意思是包下面的所有子包。(..)代

表各种方法.

然后下面的注解就比较简单了，就是在使用方法前和中，还有环绕拦截/

然后在Spring的配置文件中继续配置Bean,需要打开AOP命名空间

<?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" xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.5.xsd"><aop:aspectj-autoproxy/><bean id="personServiceBean" class="com.bird.service.impl.PersonServiceBean"/> <bean id="myInterceptor" class="com.bird.service.MyInterceptor"/> </beans>
然后建立一个Junit测试

package junit.test;import org.junit.Test;import org.springframework.context.ApplicationContext;import org.springframework.context.support.ClassPathXmlApplicationContext;import com.bird.service.PersonServer;public class SpringAOPTest {@Testpublic void inteceptorTest(){ApplicationContext ctx = new ClassPathXmlApplicationContext("beanAop.xml");PersonServer bean = (PersonServer)ctx.getBean("personServiceBean");bean.save(null);}}
测试结果为

[java] view plaincopyprint?

1. 2012-3-12 18:08:39 org.springframework.context.support.AbstractApplicationContext prepareRefresh 信息: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@dd20f6: display name [org.springframework.context.support.ClassPathXmlApplicationContext@dd20f6]; startup date [Mon Mar 12 18:08:39 CST 2012]; root of context hierarchy
2. 2012-3-12 18:08:40 org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions 信息: Loading XML bean definitions from class path resource [beanAop.xml]
3. 2012-3-12 18:08:40 org.springframework.context.support.AbstractApplicationContext obtainFreshBeanFactory 信息: Bean factory for application context [org.springframework.context.support.ClassPathXmlApplicationContext@dd20f6]: org.springframework.beans.factory.support.DefaultListableBeanFactory@b0bad7
4. 2012-3-12 18:08:40 org.springframework.beans.factory.support.DefaultListableBeanFactory preInstantiateSingletons 信息: Pre-instantiating singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@b0bad7: defining beans [org.springframework.aop.config.internalAutoProxyCreator,personServiceBean,myInterceptor]; root of factory hierarchy
5. null 前置通知
6. 进入环绕通知 我是save方法
7. 后置通知 退出方法
8. 最终通知