Spring-AOP @AspectJ进阶之绑定连接点方法的返回值

文章目录

• 概述
• 实例

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—> github.com/yangshangwe…

---

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----