文章目錄

• 概述
• 實例

概述

在后置增強中，可以通過returning綁定連接點方法的返回值

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實例

代碼已托管到Github—> https://github.com/yangshangwei/SpringMaster

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業務類

package com.xgj.aop.spring.advisor.aspectJAdvance.bingReturnValue;import org.springframework.stereotype.Component;@Component public class BussinessRet {public String dealBussiness() {System.out.println("dealBussiness executed");return "SUCCESS";} }

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切面

package com.xgj.aop.spring.advisor.aspectJAdvance.bingReturnValue;import org.aspectj.lang.annotation.AfterReturning; import org.aspectj.lang.annotation.Aspect;/*** * * @ClassName: BindReturnValueAspect* * @Description: @Aspect標注的切面，* * 在后置增強中，可以通過returning綁定連接點方法的返回值* * (1)處和(2)處的名字必須相同，此外(2)處retMsg的類型必須和連接點方法的返回值類型匹配* * @author: Mr.Yang* * @date: 2017年9月12日 下午5:47:23*/@Aspect public class BindReturnValueAspect {// (1)@AfterReturning(value = "target(com.xgj.aop.spring.advisor.aspectJAdvance.bingReturnValue.BussinessRet)", returning = "retMsg")public void crossCuttingCode(String retMsg) {// (2)System.out.println("----bindReturnValue----");System.out.println("retMsg:" + retMsg);System.out.println("----bindReturnValue----");} }

(1)處和(2)處的名字必須相同，此外(2)處retMsg的類型必須和連接點方法的返回值類型匹配

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配置文件

<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans"xmlns:aop="http://www.springframework.org/schema/aop"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xmlns:context="http://www.springframework.org/schema/context"xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsdhttp://www.springframework.org/schema/aophttp://www.springframework.org/schema/aop/spring-aop.xsdhttp://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd"><!-- (1)聲明Context命名空間以及Schema文件 (2)掃描類包以及應用注解定義的bean --> <context:component-scan base-package="com.xgj.aop.spring.advisor.aspectJAdvance.bingReturnValue"/><!-- 基于@AspectJ切面的驅動器 --> <aop:aspectj-autoproxy proxy-target-class="true"/><!-- 使用了@AspectJ注解的切面類 --> <bean class="com.xgj.aop.spring.advisor.aspectJAdvance.bingReturnValue.BindReturnValueAspect"/></beans>

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測試類

package com.xgj.aop.spring.advisor.aspectJAdvance.bingReturnValue;import org.junit.Test; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext;public class BindReturnValueAspectTest {@Testpublic void test() {ApplicationContext ctx = new ClassPathXmlApplicationContext("classpath:com/xgj/aop/spring/advisor/aspectJAdvance/bingReturnValue/conf-bindReturnValue.xml");BussinessRet bussinessRet = ctx.getBean("bussinessRet",BussinessRet.class);bussinessRet.dealBussiness();} }

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輸出結果

2017-09-12 17:53:10,730 INFO [main] (AbstractApplicationContext.java:583) - Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@3695de1a: startup date [Tue Sep 12 17:53:10 BOT 2017]; root of context hierarchy 2017-09-12 17:53:10,818 INFO [main] (XmlBeanDefinitionReader.java:317) - Loading XML bean definitions from class path resource [com/xgj/aop/spring/advisor/aspectJAdvance/bingReturnValue/conf-bindReturnValue.xml] dealBussiness executed ----bindReturnValue---- retMsg:SUCCESS ----bindReturnValue----

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