概述
在后置增强中，可以通过returning绑定连接点方法的返回值
实例
代码已托管到Github—> https://github.com/yangshangwei/SpringMaster
业务类
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"; } }
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标注的切面， * * 在后置增强中，可以通过returning绑定连接点方法的返回值 * * (1)处和(2)处的名字必须相同，此外(2)处retMsg的类型必须和连接点方法的返回值类型匹配 * * @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)处和(2)处的名字必须相同，此外(2)处retMsg的类型必须和连接点方法的返回值类型匹配
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.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd"> <!-- (1)声明Context命名空间以及Schema文件 (2)扫描类包以及应用注解定义的bean --> <context:component-scan base-package="com.xgj.aop.spring.advisor.aspectJAdvance.bingReturnValue"/> <!-- 基于@AspectJ切面的驱动器 --> <aop:aspectj-autoproxy proxy-target-class="true"/> <!-- 使用了@AspectJ注解的切面类 --> <bean class="com.xgj.aop.spring.advisor.aspectJAdvance.bingReturnValue.BindReturnValueAspect"/> </beans>
测试类
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 { @Test public 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(); } }
输出结果
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----
