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 FileSystemXmlA