在上篇博文中，我向大家介紹了Aop重要概念和教程，這回給出代碼示例。

一、XML方式

1. TestAspect：切面類

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package?com.spring.aop;??

??

import?org.aspectj.lang.JoinPoint;??

import?org.aspectj.lang.ProceedingJoinPoint;??

??

public?class?TestAspect?{??

??

????public?void?doAfter(JoinPoint?jp)?{??

????????System.out.println("log?Ending?method:?"?+?jp.getTarget().getClass().getName()?+?"."?+?jp.getSignature().getName());??

????}??

??

????public?Object?doAround(ProceedingJoinPoint?pjp)?throws?Throwable?{??

????????long?time?=?System.currentTimeMillis();??

????????Object?retVal?=?pjp.proceed();??

????????time?=?System.currentTimeMillis()?-?time;??

????????System.out.println("process?time:?"?+?time?+?"?ms");??

????????return?retVal;??

????}??

??

????public?void?doBefore(JoinPoint?jp)?{??

????????System.out.println("log?Begining?method:?"?+?jp.getTarget().getClass().getName()?+?"."?+?jp.getSignature().getName());??

????}??

??

????public?void?doThrowing(JoinPoint?jp,?Throwable?ex)?{??

????????System.out.println("method?"?+?jp.getTarget().getClass().getName()?+?"."?+?jp.getSignature().getName()?+?"?throw?exception");??

????????System.out.println(ex.getMessage());??

????}??

}??

2. AServiceImpl：目標對象

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package?com.spring.service;??

??

//?使用jdk動態代理??

public?class?AServiceImpl?implements?AService?{??

??

????public?void?barA()?{??

????????System.out.println("AServiceImpl.barA()");??

????}??

??

????public?void?fooA(String?_msg)?{??

????????System.out.println("AServiceImpl.fooA(msg:"?+?_msg?+?")");??

????}??

}??

3. BServiceImpl：目標對象

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package?com.spring.service;??

??

//?使用cglib??

public?class?BServiceImpl?{??

??

????public?void?barB(String?_msg,?int?_type)?{??

????????System.out.println("BServiceImpl.barB(msg:"?+?_msg?+?"?type:"?+?_type?+?")");??

????????if?(_type?==?1)??

????????????throw?new?IllegalArgumentException("測試異常");??

????}??

??

????public?void?fooB()?{??

????????System.out.println("BServiceImpl.fooB()");??

????}??

??

}??

4. ApplicationContext：Spring配置文件

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<?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:context="http://www.springframework.org/schema/context"??

????xmlns:tx="http://www.springframework.org/schema/tx"??

????xsi:schemaLocation="http://www.springframework.org/schema/beans?http://www.springframework.org/schema/beans/spring-beans-3.1.xsd??

????????http://www.springframework.org/schema/aop?http://www.springframework.org/schema/aop/spring-aop-3.1.xsd??

????????http://www.springframework.org/schema/context?http://www.springframework.org/schema/context/spring-context-3.1.xsd??

????????http://www.springframework.org/schema/tx?http://www.springframework.org/schema/tx/spring-tx-3.1.xsd">??

????<aop:config>??

????????<aop:aspect?id="TestAspect"?ref="aspectBean">??

????????????<!--配置com.spring.service包下所有類或接口的所有方法-->??

????????????<aop:pointcut?id="businessService"?expression="execution(*?com.spring.service.*.*(..))"?/>??

????????????<aop:before?pointcut-ref="businessService"?method="doBefore"/>??

????????????<aop:after?pointcut-ref="businessService"?method="doAfter"/>??

????????????<aop:around?pointcut-ref="businessService"?method="doAround"/>??

????????????<aop:after-throwing?pointcut-ref="businessService"?method="doThrowing"?throwing="ex"/>??

????????</aop:aspect>??

????</aop:config>??

??????

????<bean?id="aspectBean"?class="com.spring.aop.TestAspect"?/>??

????<bean?id="aService"?class="com.spring.service.AServiceImpl"></bean>??

????<bean?id="bService"?class="com.spring.service.BServiceImpl"></bean>??

</beans>??

?

二、注解（Annotation）方式

1. TestAnnotationAspect

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package?com.spring.aop;??

??

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;??

??

@Aspect??

public?class?TestAnnotationAspect?{??

??

????@Pointcut("execution(*?com.spring.service.*.*(..))")??

????private?void?pointCutMethod()?{??

????}??

??

????//聲明前置通知??

????@Before("pointCutMethod()")??

????public?void?doBefore()?{??

????????System.out.println("前置通知");??

????}??

??

????//聲明后置通知??

????@AfterReturning(pointcut?=?"pointCutMethod()",?returning?=?"result")??

????public?void?doAfterReturning(String?result)?{??

????????System.out.println("后置通知");??

????????System.out.println("---"?+?result?+?"---");??

????}??

??

????//聲明例外通知??

????@AfterThrowing(pointcut?=?"pointCutMethod()",?throwing?=?"e")??

????public?void?doAfterThrowing(Exception?e)?{??

????????System.out.println("例外通知");??

????????System.out.println(e.getMessage());??

????}??

??

????//聲明最終通知??

????@After("pointCutMethod()")??

????public?void?doAfter()?{??

????????System.out.println("最終通知");??

????}??

??

????//聲明環繞通知??

????@Around("pointCutMethod()")??

????public?Object?doAround(ProceedingJoinPoint?pjp)?throws?Throwable?{??

????????System.out.println("進入方法---環繞通知");??

????????Object?o?=?pjp.proceed();??

????????System.out.println("退出方法---環繞通知");??

????????return?o;??

????}??

}??

2. ApplicationContext：Spring配置文件

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<?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:context="http://www.springframework.org/schema/context"??

????xmlns:tx="http://www.springframework.org/schema/tx"??

????xsi:schemaLocation="http://www.springframework.org/schema/beans?http://www.springframework.org/schema/beans/spring-beans-3.1.xsd??

????????http://www.springframework.org/schema/aop?http://www.springframework.org/schema/aop/spring-aop-3.1.xsd??

????????http://www.springframework.org/schema/context?http://www.springframework.org/schema/context/spring-context-3.1.xsd??

????????http://www.springframework.org/schema/tx?http://www.springframework.org/schema/tx/spring-tx-3.1.xsd">??

????<aop:aspectj-autoproxy></aop:aspectj-autoproxy>??

????<bean?class="org.springframework.aop.aspectj.annotation.AnnotationAwareAspectJAutoProxyCreator"?/>??

??

????<bean?id="aspectBean"?class="com.spring.aop.TestAnnotationAspect"?/>??

????<bean?id="aService"?class="com.spring.service.AServiceImpl"></bean>??

????<bean?id="bService"?class="com.spring.service.BServiceImpl"></bean>??

</beans>??

?

關于切入點表達式，大家需要好好練習才能深入理解其中含義。即使看的懂，但是寫起來卻非常麻煩，并沒有想象中那么簡單。

最后，再告訴大家：

任何通知（Advice）方法可以將第一個參數定義為 org.aspectj.lang.JoinPoint類型。JoinPoint接口提供了一系列有用的方法， 比如 getArgs() （返回方法參數）、getThis() （返回代理對象）、getTarget() （返回目標）、getSignature() （返回正在被通知的方法相關信息）和 toString() （打印出正在被通知的方法的有用信息。

其中getSignature()返回的Signature對象可強制轉換為MethodSignature，其功能非常強大，能獲取包括參數名稱在內的一切方法信息。

?

============友情鏈接============

Spring Aop詳盡教程?http://blog.csdn.net/wangpeng047/article/details/8556800

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