用代码学习Spring：IoC、AOP

7 建立配置文件组织上面的类之间的关系，AOP有切入点和增强这两个重要的概念，把两个概念结合到一起，就是一个在某个方法执行的时候附加执行，切入点表示在哪里附加，增强表示附加什么，配置文件中的myPointcut表示切入点，myInterceptor表示增强的内容，myAdvisor表示增强器，即两者的结合，在bo这个bean中，我们把这个增强器附加到了bo这个bean上。

<?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="businessObjectImpl" class="BusinessObjectImpl">
        <property name="words">
            <value>正在执行业务方法</value>
        </property>
    </bean>
    <bean id="myInterceptor" class="MyInterceptor">
        <property name="before">
            <value>执行业务方法前</value>
        </property>
        <property name="after">
            <value>执行业务方法后</value>
        </property>
    </bean>
    <bean id="myPointcut" class="org.springframework.aop.support.JdkRegexpMethodPointcut">
    <property name="patterns">
        <list>
            <value>BusinessObject.doSomething</value>
        </list>
    </property>
    </bean>
    <bean id="myAdvisor" class="org.springframework.aop.support.DefaultPointcutAdvisor">
      <property name="pointcut" ref="myPointcut"/>
      <property name="advice" ref="myInterceptor"/>
    </bean>
    <bean id="bo" class="org.springframework.aop.framework.ProxyFactoryBean">
        <property name="target">
            <ref local="businessObjectImpl"/>
        </property>
        <property name="proxyInterfaces">
            <value>BusinessObject</value>
        </property>
        <property name="interceptorNames">
            <list>
                <value>myInterceptor</value>
                <value>myAdvisor</value>
            </list>
        </property>
    </bean>
</beans><?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="businessObjectImpl" class="BusinessObjectImpl">
        <property name="words">
            <value>正在执行业务方法</value>
        </property>
    </bean>
    <bean id="myInterceptor" class="MyInterceptor">
        <property name="before">
            <value>执行业务方法前</value>
        </property>
        <property name="after">
            <value>执行业务方法后</value>
        </property>
    </bean>
    <bean id="myPointcut" class="org.springframework.aop.support.JdkRegexpMethodPointcut">
    <property name="patterns">
        <list>
            <value>BusinessObject.doSomething</value>
        </list>
    </property>
    </bean>
    <bean id="myAdvisor" class="org.springframework.aop.support.DefaultPointcutAdvisor">
      <property name="pointcut" ref="myPointcut"/>
      <property name="advice" ref="myInterceptor"/>
    </bean>
    <bean id="bo" class="org.springframework.aop.framework.ProxyFactoryBean">
        <property name="target">
            <ref local="businessObjectImpl"/>
        </property>
        <property name="proxyInterfaces">
            <value>BusinessObject</value>
        </property>
        <property name="interceptorNames">
            <list>
                <value>myInterceptor</value>
                <value>myAdvisor</value>
            </list>
        </property>
    </bean>
</beans>


8 运行Main类，观察控制台输出结果，重新审查代码，反思为什么会出现这种结果。

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