文章目錄

• 導讀
• 概述
• 實例

導讀

Spring-AOP 自動創建代理

Spring-AOP 自動創建代理之BeanNameAutoProxyCreator

Spring-AOP 自動創建代理之DefaultAdvisorAutoProxyCreator

Spring-AOP 自動創建代理之AnnotationAwareAspectJAutoProxyCreator

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概述

我們知道切面Advisor是切點和增強的復合體，Advisor本身已經包含了足夠的信息，如橫切邏輯及連接點。

DefaultAdvisorAutoProxyCreator能夠掃描Advisor,并將Advisor自動織入匹配的目標Bean中，即為匹配的目標Bean自動創建代理。

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實例

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

在 Spring-AOP 靜態正則表達式方法匹配切面通過ProxyFactoryBean為waiter和seller配置了代理，如下

<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans"xmlns:p="http://www.springframework.org/schema/p"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd"><!-- 配置切面：靜態正則表達式方法匹配切面 --><!-- Waiter目標類 --><bean id="waiterTarget" class="com.xgj.aop.spring.advisor.RegexpMethodPointcutAdvisor.Waiter"/><!-- Seller目標類 --><bean id="sellerTarget" class="com.xgj.aop.spring.advisor.RegexpMethodPointcutAdvisor.Seller"/><!-- 前置增強 --><bean id="greetBeforeAdvice" class="com.xgj.aop.spring.advisor.RegexpMethodPointcutAdvisor.GreetBeforeAdivce"/><!-- 切面 --><bean id="regexpAdvisor" class="org.springframework.aop.support.RegexpMethodPointcutAdvisor"p:advice-ref="greetBeforeAdvice"p:pattern=".*greet.*" > <!-- 向切面注入一個前置增強 ， 用正則表達式定義目標類全限定方法名的匹配模式串 。--></bean><!-- 通過父bean,配置公共的信息 --><bean id="parent" abstract="true" class="org.springframework.aop.framework.ProxyFactoryBean"p:interceptorNames="regexpAdvisor"p:proxyTargetClass="true"/><!-- waiter代理 --><bean id="waiter" parent="parent" p:target-ref="waiterTarget"/><!-- seller代理 --><bean id="seller" parent="parent" p:target-ref="sellerTarget"/></beans>

在這里引入DefaultAdvisorAutoProxyCreator為容器中所有帶 “greet”方法名的目標Bean自動創建代理，配置如下

<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans"xmlns:p="http://www.springframework.org/schema/p"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd"><!--通過Advisor自動創建代理--><!-- 目標Bean --><bean id="waiter" class="com.xgj.aop.spring.advisor.autoCreateProxy.DefaultAdvisorProxyCreator.Waiter"/><bean id="seller" class="com.xgj.aop.spring.advisor.autoCreateProxy.DefaultAdvisorProxyCreator.Seller"/><!-- 增強 --><bean id="greetingBeforeAdvice" class="com.xgj.aop.spring.advisor.autoCreateProxy.DefaultAdvisorProxyCreator.GreetingBeforeAdvice"/><!-- 切面 --><bean id="regexpAdvisor" class="org.springframework.aop.support.RegexpMethodPointcutAdvisor"p:patterns=".*greet.*"p:advice-ref="greetingBeforeAdvice"/><!-- 代理 --><bean class="org.springframework.aop.framework.autoproxy.DefaultAdvisorAutoProxyCreator"/></beans>

最后一行，用DefaultAdvisorAutoProxyCreator定義一個Bean，它負責將容器中的Advisor織入匹配的目標Bean中。

測試類：

package com.xgj.aop.spring.advisor.autoCreateProxy.DefaultAdvisorProxyCreator;import org.junit.Test; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext;public class DefaultAdvisorProxyCreatorTest {@Testpublic void test() {ApplicationContext ctx = new ClassPathXmlApplicationContext("classpath:com/xgj/aop/spring/advisor/autoCreateProxy/DefaultAdvisorProxyCreator/conf-defaultAdvisorProxyCreator.xml");Waiter waiter = ctx.getBean("waiter", Waiter.class);waiter.greetTo("XiaoGongJiang");waiter.serverTo("XiaoGongJiang");System.out.println("\n");Seller seller = ctx.getBean("seller", Seller.class);seller.greetTo("XiaoGongJiang");seller.serverTo("XiaoGongJiang");} }

運行結果

2017-08-21 16:28:37,239 INFO [main] (AbstractApplicationContext.java:583) - Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@eb6dcf9: startup date [Mon Aug 21 16:28:37 BOT 2017]; root of context hierarchy 2017-08-21 16:28:37,388 INFO [main] (XmlBeanDefinitionReader.java:317) - Loading XML bean definitions from class path resource [com/xgj/aop/spring/advisor/autoCreateProxy/DefaultAdvisorProxyCreator/conf-defaultAdvisorProxyCreator.xml] Pointcut:com.xgj.aop.spring.advisor.autoCreateProxy.DefaultAdvisorProxyCreator.Waiter.greetTo How are you XiaoGongJiang ? Waiter Greet To XiaoGongJiang Waiter Server To XiaoGongJiangPointcut:com.xgj.aop.spring.advisor.autoCreateProxy.DefaultAdvisorProxyCreator.Seller.greetTo How are you XiaoGongJiang ? Seller Greet To XiaoGongJiang Seller Server To XiaoGongJiang

從運行結果中，只有greetTo方法被織入了增強，由此可見，增強被正確的織入匹配的連接點中。

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