最常用的两个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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1. <bean id="urlMapping" class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping">  
2.     <property name="mappings">  
3.         <props>  
4.             <prop key="/project.htm">projectController</prop>  
5.             <prop key="/manage.htm">managementController</prop>  
6.             <prop key="/user.htm">userController</prop>  
7.             <prop key="/upload.htm">fileUploadController</prop>  
8.         </props>  
9.     </property>  
10. </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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1. <bean id="urlMapping" class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping">  
2.     <property name="interceptors">  
3.         <list>  
4.             <ref bean="localeChangeInterceptor"/>  
5.             <ref bean="someOtherCheckInterceptor"/>  
6.         </list>  
7.     </property>  
8.     <property name="mappings">  
9.         <props>  
10.             <prop key="/project.htm">projectController</prop>  
11.             <prop key="/manage.htm">managementController</prop>  
12.             <prop key="/user.htm">userController</prop>  
13.             <prop key="/upload.htm">fileUploadController</prop>  
14.         </props>  
15.     </property>  
16. </bean>