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。

工程结构图：

业务接口：

package com.bijian.study;

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 com.bijian.study;

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 com.bijian.study;

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 com.bijian.study;

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 ");
  }
}

普通Bean类：

package com.bijian.study;

public class Customer {

	private String name;
	private int age;
	
	public Customer(String name, int age) {
		this.name = name;
		this.age = age;
	}
	
	public String getName() {
		return name;
	}
}

配置文件：

<?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="com.bijian.study.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="com.bijian.study.ShoppingImplA"><property name="customer"><ref bean="customer" /></property></bean><bean id="sellBean" class="com.bijian.study.ShoppingImplB"><property name="customer"><ref bean="customer" /></property></bean><bean id="customer" class="com.bijian.study.Customer"><constructor-arg index="0"><value>gaoxiang</value></constructor-arg><constructor-arg index="1"><value>26</value></constructor-arg></bean></beans>

        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（id非必需）和class,spring会自动帮我们解析advisor，并将通知进行切入。

测试程序：

package com.bijian.study.test;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.bijian.study.Shopping;

public class TestAdvisor {

    public static void main(String[] args) {

//    	String filePath=System.getProperty("user.dir")+File.separator+"src"+File.separator+"applicationContext.xml";
//        ApplicationContext ctx=new FileSystemXmlApplicationContext(filePath);
        ApplicationContext ctx = new ClassPathXmlApplicationContext("applicationContext.xml");
        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");
    }
}

        需要注意的是：和BeanNameAutoProxyCreator相同，我们需要用ApplicationContext获得Bean。运行结果：

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

        可以看到我们定义的所有***sell***的方法，都被切入了前置通知。

PS：在执行时如报java.lang.NoClassDefFoundError: org/aopalliance/aop/Advice错，是少了aopalliance包，这个包涉及到动态织入。是spring的常用联盟包，必不可少。