<mvc:annotation-driven/>浅析

在Spring中这是一个很简洁的标签。它是对两个bean的简写。

在3.0中是  DefaultAnnotationHandlerMapping 和 AnnotationMethodHandlerAdapter  ,从3.1开始改成了 RequestMappingHandlerMapping 和 RequestMappingHandlerAdapter

其中，Adapter中注入了一个MessageConverter列表，该列表中又注入了几个经常用到的格式转换，比如XmlHttpMessageConverter/JsonHttpMessageConverter等，详见下面贴来的Spring 3.0.X：

   

<!-- 注解请求映射  -->
    <bean class="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping">        
        <property name="interceptors">
            <list>  
                <ref bean="logNDCInteceptor"/>   <!-- 日志拦截器，这是你自定义的拦截器 -->
            </list>        
        </property>        
    </bean>      
    <bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
        <property name="messageConverters">  
            <list>  
                <ref bean="byteArray_hmc" />  
                <ref bean="string_hmc" />  
                <ref bean="resource_hmc" />  
                <ref bean="source_hmc" />  
                <ref bean="xmlAwareForm_hmc" />  
                <ref bean="jaxb2RootElement_hmc" />  
                <ref bean="jackson_hmc" />  
            </list>  
        </property>  
    </bean>  
    <bean id="byteArray_hmc" class="org.springframework.http.converter.ByteArrayHttpMessageConverter" /><!-- 处理.. -->
    <bean id="string_hmc" class="org.springframework.http.converter.StringHttpMessageConverter" /><!-- 处理.. -->
    <bean id="resource_hmc" class="org.springframework.http.converter.ResourceHttpMessageConverter" /><!-- 处理.. -->
    <bean id="source_hmc" class="org.springframework.http.converter.xml.SourceHttpMessageConverter" /><!-- 处理.. -->
    <bean id="xmlAwareForm_hmc" class="org.springframework.http.converter.xml.XmlAwareFormHttpMessageConverter" /><!-- 处理.. -->
    <bean id="jaxb2RootElement_hmc" class="org.springframework.http.converter.xml.Jaxb2RootElementHttpMessageConverter" /><!-- 处理.. -->
    <bean id="jackson_hmc" class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter" /><!-- 处理json-->