Spring-AOP 自动创建代理之DefaultAdvisorAutoProxyCreator

导读

概述

实例

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 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。