Spring-AOP 自动创建代理之DefaultAdvisorAutoProxyCreator

导读

Spring-AOP 自动创建代理

Spring-AOP 自动创建代理之BeanNameAutoProxyCreator

Spring-AOP 自动创建代理之DefaultAdvisorAutoProxyCreator

Spring-AOP 自动创建代理之AnnotationAwareAspectJAutoProxyCreator

---

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 hierarchy2017-08-21 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.greetToHow are you XiaoGongJiang ?Waiter Greet To XiaoGongJiangWaiter Server To XiaoGongJiangPointcut:com.xgj.aop.spring.advisor.autoCreateProxy.DefaultAdvisorProxyCreator.Seller.greetToHow are you XiaoGongJiang ?Seller Greet To XiaoGongJiangSeller 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。