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Spring-AOP自动创建代理之BeanNameAutoProxyCreator实例

实例

代码已托管到Github—> https://github测试数据/yangshangwei/SpringMaster

在 Spring-AOP 静态普通方法名匹配切面 案例中,我们通过配置两个ProxyFactoryBean分别为waiter和seller的Bean创建代理对象,

如下

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<? xml version = "1.0" encoding = "UTF-8" ?>

< beans xmlns = "http://HdhCmsTestspringframework.org/schema/beans"

     xmlns:p = "http://HdhCmsTestspringframework.org/schema/p"

     xmlns:xsi = "http://HdhCmsTestw3.org/2001/XMLSchema-instance"

     xsi:schemaLocation = "http://HdhCmsTestspringframework.org/schema/beans http://HdhCmsTestspringframework.org/schema/beans/spring-beans.xsd" >

    

     <!-- 配置切面:静态方法匹配切面 -->

    

     <!-- Waiter目标类 -->

     < bean id = "waiterTarget" class = "com.xgj.aop.spring.advisor.StaticMethodMatcherPointcutAdvisor.Waiter" />

     <!-- Seller目标类 -->

     < bean id = "sellerTarget" class = "com.xgj.aop.spring.advisor.StaticMethodMatcherPointcutAdvisor.Seller" />

    

     <!-- 前置增强 -->

     < bean id = "greetBeforeAdvice" class = "com.xgj.aop.spring.advisor.StaticMethodMatcherPointcutAdvisor.GreetBeforeAdivce" />

    

     <!-- 切面 -->

     < bean id = "greetAdvicesor" class = "com.xgj.aop.spring.advisor.StaticMethodMatcherPointcutAdvisor.GreetingAdvisor"

         p:advice-ref = "greetBeforeAdvice" /> <!-- 向切面注入一个前置增强 -->

        

     <!-- 通过父bean,配置公共的信息 -->

     < bean id = "parent" abstract = "true"

         class = "org.springframework.aop.framework.ProxyFactoryBean"

         p:interceptorNames = "greetAdvicesor"

         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 >

下面我们通过BeanNameAtuoProxyCreator以更优雅更快捷的方式完成相同的功能

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<? xml version = "1.0" encoding = "UTF-8" ?>

< beans xmlns = "http://HdhCmsTestspringframework.org/schema/beans"

     xmlns:p = "http://HdhCmsTestspringframework.org/schema/p"

     xmlns:xsi = "http://HdhCmsTestw3.org/2001/XMLSchema-instance"

     xsi:schemaLocation = "http://HdhCmsTestspringframework.org/schema/beans http://HdhCmsTestspringframework.org/schema/beans/spring-beans.xsd" >

    

     <!-- 通过Bean名称自动创建代理 -->

    

     <!-- 目标Bean -->

     < bean id = "waiter" class = "com.xgj.aop.spring.advisor.autoCreateProxy.BeanNameAutoProxyCreator.Waiter" />

     < bean id = "seller" class = "com.xgj.aop.spring.advisor.autoCreateProxy.BeanNameAutoProxyCreator.Seller" />

    

     <!-- 增强 -->

     < bean id = "greetingBeforeAdvice" class = "com.xgj.aop.spring.advisor.autoCreateProxy.BeanNameAutoProxyCreator.GreetingBeforeAdvice" />

    

     <!-- 代理      p:beanNames="waiter,seller" -->

     < bean class = "org.springframework.aop.framework.autoproxy.BeanNameAutoProxyCreator"

         p:beanNames = "*er"

         p:interceptorNames = "greetingBeforeAdvice"

         p:optimize = "true" />

</ beans >

BeanNameAutoProxyCreator有一个beanNames属性,它允许用户指定一组需要自动代理的Bean名称,Bean名称可以使用*通配符。

假设Spring容器中有waiter和seller外还有其他的bean, 就可以通过beanNames属性设定为[*er] 使wiater和seller这两个bean被自动代理。 当然,如果还有其他以er结尾的bean也会被自动代理器创建代理,为了保险起见,可以使用
<property name="beanNames" value="waiter,seller">的方式限定范围。

一般不会为FactoryBean的Bean创建代理,如果刚好有这样一个需求,这需要在beanNames中指定添加 的Bean 名 称 , 如 ‘ <property name="beanNames"value" 的Bean名称,如`<property name="beanNames" value=" 的Bean名称,如‘<propertyname="beanNames"value="waiter">`

BeanNameAutoProxyCreator的interceptorNames属性指定一个或者多个Bean的名称。

此外还有一个常用的optimize属性,如果将此属性设置为true,则将强制使用CGLib动态代理技术。

通过这样的配置后,容器在创建waiter和seller Bean的实例是,就会自动为他们创建代理对象,而这一操作对使用者来讲完全是透明的。

测试类如下:

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package com.xgj.aop.spring.advisor.autoCreateProxy.BeanNameAutoProxyCreator;

import org.junit.Test;

import org.springframework.context.ApplicationContext;

import org.springframework.context.support.ClassPathXmlApplicationContext;

public class BeanNameAutoProxyCreatorTest {

     @Test

     public void test() {

         ApplicationContext ctx = new ClassPathXmlApplicationContext(

                 "classpath:com/xgj/aop/spring/advisor/autoCreateProxy/BeanNameAutoProxyCreator/conf-beanNameAutoProxy.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" );

     }

}

运行结果如下:

2017-08-21 16:12:48,086  INFO [main] (AbstractApplicationContext.java:583) - Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@5f0101fb: startup date [Mon Aug 21 16:12:48 BOT 2017]; root of context hierarchy
2017-08-21 16:12:48,204  INFO [main] (XmlBeanDefinitionReader.java:317) - Loading XML bean definitions from class path resource [com/xgj/aop/spring/advisor/autoCreateProxy/BeanNameAutoProxyCreator/conf-beanNameAutoProxy.xml]
Pointcut:com.xgj.aop.spring.advisor.autoCreateProxy.BeanNameAutoProxyCreator.Waiter.greetTo
How are you XiaoGongJiang ?
Waiter Greet To XiaoGongJiang
Pointcut:com.xgj.aop.spring.advisor.autoCreateProxy.BeanNameAutoProxyCreator.Waiter.serverTo
How are you XiaoGongJiang ?
Waiter Server To XiaoGongJiang


Pointcut:com.xgj.aop.spring.advisor.autoCreateProxy.BeanNameAutoProxyCreator.Seller.greetTo
How are you XiaoGongJiang ?
Seller Greet To XiaoGongJiang
Pointcut:com.xgj.aop.spring.advisor.autoCreateProxy.BeanNameAutoProxyCreator.Seller.serverTo
How are you XiaoGongJiang ?
Seller Server To XiaoGongJiang

通过输出信息可以得知,从容器返回的Bean的 全部方法都被织入了增强。

以上为个人经验,希望能给大家一个参考,也希望大家多多支持。

原文链接:https://artisan.blog.csdn.net/article/details/77466466

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