学步园

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