1. 为了在Spring中启动@AspectJ支持，需要在类加载路径下新增两个AspectJ库：aspectjweaver.jar和aspectjrt.jar。除此之外，Spring AOP还需要依赖一个aopalliance.jar包
2. 定义一个类似ServiceAspect.java这样的切面bean:

3.  1 package com.hyq.aop; 2  3 import org.apache.commons.logging.Log; 4 import org.apache.commons.logging.LogFactory; 5 import org.aspectj.lang.JoinPoint; 6 import org.aspectj.lang.ProceedingJoinPoint; 7 import org.aspectj.lang.annotation.After; 8 import org.aspectj.lang.annotation.AfterReturning; 9 import org.aspectj.lang.annotation.AfterThrowing;10 import org.aspectj.lang.annotation.Around;11 import org.aspectj.lang.annotation.Aspect;12 import org.aspectj.lang.annotation.Before;13 import org.aspectj.lang.annotation.Pointcut;14 import org.springframework.stereotype.Component;15 16 /**17  * 系统服务组件Aspect切面Bean18  * @author Shenghany19  */20 //声明这是一个组件21 @Component22 //声明这是一个切面Bean23 @Aspect24 public class ServiceAspect {25 26     private final static Log log = LogFactory.getLog(ServiceAspect.class);27 28     //配置切入点,该方法无方法体,主要为方便同类中其他方法使用此处配置的切入点29     @Pointcut("execution(* com.hyq.aop..*(..))")30     public void aspect(){    }31 32     /*33      * 配置前置通知,使用在方法aspect()上注册的切入点34      * 同时接受JoinPoint切入点对象,可以没有该参数35      */36     @Before("aspect()")37     public void before(JoinPoint joinPoint){38         System.out.println("执行before.....");39     }40 41     //配置后置通知,使用在方法aspect()上注册的切入点42     @After("aspect()")43     public void after(JoinPoint joinPoint){44         System.out.println("执行after.....");45     }46 47     //配置环绕通知,使用在方法aspect()上注册的切入点48     @Around("aspect()")49     public void around(JoinPoint joinPoint){50         long start = System.currentTimeMillis();51         try {52             ((ProceedingJoinPoint) joinPoint).proceed();53             long end = System.currentTimeMillis();54             if(log.isInfoEnabled()){55                 log.info("around " + joinPoint + "\tUse time : " + (end - start) + " ms!");56             }57         } catch (Throwable e) {58             long end = System.currentTimeMillis();59             if(log.isInfoEnabled()){60                 log.info("around " + joinPoint + "\tUse time : " + (end - start) + " ms with exception : " + e.getMessage());61             }62         }63     }64 65     //配置后置返回通知,使用在方法aspect()上注册的切入点66     @AfterReturning("aspect()")67     public void afterReturn(JoinPoint joinPoint){68         if(log.isInfoEnabled()){69             log.info("afterReturn " + joinPoint);70         }71     }72 73     //配置抛出异常后通知,使用在方法aspect()上注册的切入点74     @AfterThrowing(pointcut="aspect()", throwing="ex")75     public void afterThrow(JoinPoint joinPoint, Exception ex){76         if(log.isInfoEnabled()){77             log.info("afterThrow " + joinPoint + "\t" + ex.getMessage());78         }79     }80 81 }

   3.定义一个业务组件，如：

4.  1 package com.hyq.aop; 2  3 import org.apache.commons.logging.Log; 4 import org.apache.commons.logging.LogFactory; 5 import org.springframework.stereotype.Component; 6 @Component() 7 public class UserService { 8  9     private final static Log log = LogFactory.getLog(UserService.class);10     11     public User get(long id){12         if(log.isInfoEnabled()){13             log.info("getUser method . . .");14         }15         return new User();16     }17     18     public void save(User user){19         if(log.isInfoEnabled()){20             log.info("saveUser method . . .");21         }22     }23     24     public boolean delete(long id) throws Exception{25         if(log.isInfoEnabled()){26             log.info("delete method . . .");27             throw new Exception("spring aop ThrowAdvice演示");28         }29         return false;30     }31     32 }

   业务组件要用@Component()注解修饰

　　　　4.在bean.xml中加入下面配置:

1 <!-- 激活组件扫描功能,在包com.hyq.aop及其子包下面自动扫描通过注解配置的组件 -->2     <context:component-scan base-package="com.hyq.aop"/>3     <!-- 激活自动代理功能 -->4     <!-- <aop:aspectj-autoproxy proxy-target-class="true"/> -->5     <aop:aspectj-autoproxy/>

Spring AOP基于注解的“零配置”方式实现