概述
我们知道切面Advisor是切点和增强的复合体，Advisor本身已经包含了足够的信息，如横切逻辑及连接点。
DefaultAdvisorAutoProxyCreator能够扫描Advisor,并将Advisor自动织入匹配的目标Bean中，即为匹配的目标Bean自动创建代理。
实例
代码已托管到Github—> https://github.com/yangshangwei/SpringMaster
在 Spring-AOP 静态正则表达式方法匹配切面通过ProxyFactoryBean为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：静态正则表达式方法匹配切面 --> <!-- Waiter目标类 --> <bean id="waiterTarget" class="com.xgj.aop.spring.advisor.RegexpMethodPointcutAdvisor.Waiter"/> <!-- Seller目标类 --> <bean id="sellerTarget" class="com.xgj.aop.spring.advisor.RegexpMethodPointcutAdvisor.Seller"/> <!-- 前置增强 --> <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.*" > <!-- 向切面注入一个前置增强 ， 用正则表达式定义目标类全限定方法名的匹配模式串 。--> </bean> <!-- 通过父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>
在这里引入DefaultAdvisorAutoProxyCreator为容器中所有带 “greet”方法名的目标Bean自动创建代理，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"> <!--通过Advisor自动创建代理--> <!-- 目标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"/> <!-- 增强 --> <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定义一个Bean，它负责将容器中的Advisor织入匹配的目标Bean中。
测试类：
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 { @Test public 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"); } }
运行结果
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 XiaoGongJiang Pointcut:com.xgj.aop.spring.advisor.autoCreateProxy.DefaultAdvisorProxyCreator.Seller.greetTo How are you XiaoGongJiang ? Seller Greet To XiaoGongJiang Seller Server To XiaoGongJiang
从运行结果中，只有greetTo方法被织入了增强，由此可见，增强被正确的织入匹配的连接点中。
