使用DefaultAdvisorAutoProxyCreator实现spring的自动代理

DefaultAdvisorAutoProxyCreator这个类功能更为强大，这个类的奇妙之处是他实现了BeanProcessor接口,当ApplicationContext读如所有的Bean配置信息后，这个类将扫描上下文，寻找所有的Advistor(一个Advisor是一个切入点和一个通知的组成)，将这些Advisor应用到所有符合切入点的Bean中

业务接口：




package StaticAdvisorTest;






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：




package AutoProxyTwo;






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;


}




}






package AutoProxyTwo;






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;


}




}





通知：




package AutoProxyTwo;




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：

我们配置一个advisor，方法和在我的blog关于静态切入点的用正则表达式配置切入点相同，这里匹配的是业务实现类中所有型如：***sell***的方法

buyBean和sellBean是最为普通的IOC配置

重点在autoProxyCreator中，我们只需配置一个id和class,spring会自动帮我们解析advisor,并将通知进行切入


<?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="AutoProxyTwo.WelcomeAdvice">


</bean>





<!-- 自动代理所有的advisor -->


<bean id="autoProxyCreator" class="org.springframework.aop.framework.autoproxy.DefaultAdvisorAutoProxyCreator">


</bean>








<bean id="advisor" class="org.springframework.aop.support.RegexpMethodPointcutAdvisor">


<property name="pattern">


<value>.*sell.+</value> <!-- 业务实现方法名匹配 -->


</property>


<property name="advice">


<ref bean="WelcomeAdvice"/>


</property>


</bean>








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


<property name="customer">


<ref bean="customer"/>


</property>


</bean>


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


<property name="customer">


<ref bean="customer"/>


</property>


</bean>






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


<constructor-arg index="0">


<value>gaoxiang</value>


</constructor-arg>


<constructor-arg index="1">


<value>26</value>


</constructor-arg>


</bean>






</beans>







测试程序：

需要注意的是，和BeanNameAutoProxyCreator相同，我们需要用ApplicationContext获得Bean


package AutoProxyTwo;




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;




public class TestAdvisor ...{






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




String filePath=System.getProperty("user.dir")+File.separator+"AutoProxyTwo"+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：

可以看到我们定义的所有***sell***的方法，都被切入了前置通知

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