spring学习笔记：spring mvc处理器映射(handlerMapping)

 

handlerMapping的工作就是为每个请求找到合适的处理器handler.
最常用的两个handlerMapping:
BeanNameUrlHandlerMapping: 查找spring容器中和请求的url同名的bean.这个映射器不需要配置,因为spring在找不到handlerMapping的情况下会使用BeanNameUrlHandlerMapping.如果一定要配置,像下面这样就行了:
<bean class="org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping" />
比如有一个请求/index.htm, 则就会找到一个名叫/index.htm的bean来处理这个请求; 这种做法让我们可以做出虚拟目录的效果:
<bean name="/user/index.htm" class="controller.TestController" />
<bean name="/admin/index.htm" class="controller.TestController" />
SimpleUrlHandlerMapping: 这个handlerMapping可以配置请求的url和handler的映射关系.
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<bean id="urlMapping" class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping"> 
    <property name="mappings"> 
        <props> 
            <prop key="/project.htm">projectController</prop> 
            <prop key="/manage.htm">managementController</prop> 
            <prop key="/user.htm">userController</prop> 
            <prop key="/upload.htm">fileUploadController</prop> 
        </props> 
    </property> 
</bean> 
<bean id="urlMapping" class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping">
    <property name="mappings">
        <props>
            <prop key="/project.htm">projectController</prop>
            <prop key="/manage.htm">managementController</prop>
            <prop key="/user.htm">userController</prop>
            <prop key="/upload.htm">fileUploadController</prop>
        </props>
    </property>
</bean>
 

前面提到了DiapatcherServlet查询handlerMapping获得handler,handlerMapping事实上返回的是HandlerExecutionChain,HandlerExecutionChain里面的interceptor正是在handlerMapping中配置的:
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<bean id="urlMapping" class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping"> 
    <property name="interceptors"> 
        <list> 
            <ref bean="localeChangeInterceptor"/> 
            <ref bean="someOtherCheckInterceptor"/> 
        </list> 
    </property> 
    <property name="mappings"> 
        <props> 
            <prop key="/project.htm">projectController</prop> 
            <prop key="/manage.htm">managementController</prop> 
            <prop key="/user.htm">userController</prop> 
            <prop key="/upload.htm">fileUploadController</prop> 
        </props> 
    </property> 
</bean> 

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