实例
代码已托管到Github—> https://github.com/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://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://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服务器之家。
原文链接:https://artisan.blog.csdn.net/article/details/77466466