spring中ref属性与<ref/>标签

在bean的内部引用另一个bean对象：

　　使用ref标签对其进行引用： <ref bean="viewResolver2"/>

<bean id="viewResolver"
		class="org.springframework.web.servlet.view.InternalResourceViewResolver">
		<property name="prefix" value="/" />
		<property name="suffix" value=".jsp" />
		<property name="order" value="2"/>
</bean>

<bean class="org.springframework.web.servlet.view.ContentNegotiatingViewResolver">
    <property name="viewResolvers">
        <list>
            <bean class="org.springframework.web.servlet.view.freemarker.FreeMarkerViewResolver"/>    
            <!-- 引用外部id为viewResolver的bean -->
            <ref bean="viewResolver"/>
        </list>
    </property>  
</bean>

　　

ref属性：用来给一个对象的属性设置值

使用<ref bean="viewResolver"/>
bean id="sessionFactory" class="org.springframework.orm.hibernate3.LocalSessionFactoryBean"> <!-- 在spring框架加载时创建 -->
 <bean id="borrowDao" class="dao.impl.BorrowDao" primary="true"  lazy-init="true">
  <property name="sessionFactory" ref="sessionFactory"></property>
 </bean>

　　

ref标签：用来引用另一个bean：

<ref bean="viewResolver"/>，在spring容器中群钊id为viewResolver的bean对象