使用BeanNameAutoProxyCreator实现spring的自动代理

提到代理，我们可以使用ProxyBeanFactory，并配置proxyInterfaces,target和interceptorNames实现，但如果需要代理的bean很多，无疑会对spring配置文件的编写带来繁重的工作

Spring为我们提供了，根据beanName匹配后进行自动代理的解决方法

业务接口




package AutoProxyOne;






public interface Shopping ...{


public String buySomething(String type);


public String buyAnything(String type);


public String sellSomething(String type);


public String sellAnything(String type);






}



业务实现类A，作为配置文件中的buyBean：




package AutoProxyOne;






public class ShoppingImplA implements Shopping ...{


private Customer customer;




public Customer getCustomer() ...{


return customer;


}




public void setCustomer(Customer customer) ...{


this.customer = customer;


}




public String buySomething(String type) ...{


System.out.println(this.getCustomer().getName()+" bye "+type+" success");


return null;


}







public String buyAnything(String type) ...{


System.out.println(this.getCustomer().getName()+" bye "+type+" success");


return null;




}




public String sellAnything(String type) ...{


System.out.println(this.getCustomer().getName()+" sell "+type+" success");


return null;


}




public String sellSomething(String type) ...{


System.out.println(this.getCustomer().getName()+" sell "+type+" success");


return null;


}




}





业务实现类B，作为配置文件中的sellBean：




package AutoProxyOne;






public class ShoppingImplB implements Shopping ...{


private Customer customer;




public Customer getCustomer() ...{


return customer;


}




public void setCustomer(Customer customer) ...{


this.customer = customer;


}




public String buySomething(String type) ...{


System.out.println(this.getCustomer().getName()+" bye "+type+" success");


return null;


}







public String buyAnything(String type) ...{


System.out.println(this.getCustomer().getName()+" bye "+type+" success");


return null;




}




public String sellAnything(String type) ...{


System.out.println(this.getCustomer().getName()+" sell "+type+" success");


return null;


}




public String sellSomething(String type) ...{


System.out.println(this.getCustomer().getName()+" sell "+type+" success");


return null;


}




}





切面通知：




package AutoProxyOne;




import java.lang.reflect.Method;




import org.springframework.aop.MethodBeforeAdvice;


//前置通知




public class WelcomeAdvice implements MethodBeforeAdvice ...{




public void before(Method method, Object[] args, Object obj)




throws Throwable ...{





System.out.println("Hello welcome to bye ");




}




}





配置文件：

其中beanNames为buy*,意味着所有以buy开头的bean,都被spring容易自动代理，执行相应的切面通知




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


<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd" >


<beans>


<bean id="WelcomeAdvice" class="AutoProxyOne.WelcomeAdvice">


</bean>





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


<property name="beanNames">


<list>


<value>buy*</value>


</list>


</property>


<property name="interceptorNames">


<list>


<value>WelcomeAdvice</value>


</list>


</property>




</bean>





<bean id="buyBean" class="AutoProxyOne.ShoppingImplA">


<property name="customer">


<ref bean="customer"/>


</property>


</bean>


<bean id="sellBean" class="AutoProxyOne.ShoppingImplB">


<property name="customer">


<ref bean="customer"/>


</property>


</bean>






<bean id="customer" class="AutoProxyOne.Customer">


<constructor-arg index="0">


<value>gaoxiang</value>


</constructor-arg>


<constructor-arg index="1">


<value>26</value>


</constructor-arg>


</bean>






</beans>







测试代码：

在测试代码中，我们的buyBean打印两条买的信息，sellBean打印两条卖的信息，可以看到buyBean执行的方法已经进行了切面处理

需要注意的是，如果使用自动代码，则获得Spring Bean工厂要用

ApplicationContext ctx=new FileSystemXmlApplicationContext(filePath);

而不能用

BeanFactory factory=new XmlBeanFactory(new FileSystemResource(filePath));

原因我想是因为BeanFactory在初始化时并不实例化单例的Bean,而ApplicationContext则在初始化时候全部实例化了Bean,自动代理需要在初始化时候定义好代理关系




package AutoProxyOne;




import java.io.File;




import org.springframework.beans.factory.BeanFactory;


import org.springframework.beans.factory.xml.XmlBeanFactory;


import org.springframework.context.ApplicationContext;


import org.springframework.context.support.FileSystemXmlApplicationContext;


import org.springframework.core.io.FileSystemResource;






import org.springframework.aop.support.RegexpMethodPointcutAdvisor;




public class TestAdvisor ...{






public static void main(String[] args) ...{




String filePath=System.getProperty("user.dir")+File.separator+"AutoProxyOne"+File.separator+"hello.xml";





BeanFactory factory=new XmlBeanFactory(new FileSystemResource(filePath));


ApplicationContext ctx=new FileSystemXmlApplicationContext(filePath);


Shopping shoppingA=null;


Shopping shoppingB=null;


shoppingA=(Shopping)ctx.getBean("buyBean");


shoppingB=(Shopping)ctx.getBean("sellBean");


shoppingA.buySomething("something");


shoppingA.buyAnything("anything");


shoppingB.sellAnything("anything");


shoppingB.sellSomething("something");










}


}





运行结果：

Hello welcome to bye
gaoxiang bye something success
Hello welcome to bye
gaoxiang bye anything success
gaoxiang sell anything success
gaoxiang sell something success



可以看到，buyBean的方法都进行了切面处理，而sellBean的方法没有进行切面处理