org.apache.catalina.connector.RequestFacade cannot be cast to org.springframewor

spring mvc 上传时

 

org.apache.catalina.connector.RequestFacade cannot be cast to org.springframework.web.multipart.MultipartHttpServletRequest

 

解决方法

 

添加配置:

 

 

<bean id="multipartResolver"
        class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
        <!-- set the max upload size100MB -->
        <property name="maxUploadSize">
            <value>104857600</value>
        </property>
        <property name="maxInMemorySize">
            <value>4096</value>
        </property>
    </bean>

<bean id="multipartResolver"
		class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
		<!-- set the max upload size100MB -->
		<property name="maxUploadSize">
			<value>104857600</value>
		</property>
		<property name="maxInMemorySize">
			<value>4096</value>
		</property>
	</bean>

问题解决.

 

 

简单分析:

当Web请求到达DispatcherServlet并等待处理的时候,DispatcherServlet首先会检查能否从自己的WebApplicationContext中找到一个名称为multipartResolver(由DispatcherServet的MULTIPART_RESOLVER_BEAN_NAME决定)实例.如果能获得这个实例,DispatcherServlet将通过MultipartResolver的isMultipart(request)方法检查当前Web请求是否为multipart类型.如果是,DispatcherServlet将调用MultipartResolver的resolveMultipart(request)方法,返回MultipartHttpServletRequest,否则返回HttpServletRequest.

 

SpringMVC为MultipartResolver提供了两个实现类,org.springframework.web.multipart.commons.CommonsMultipartResolver使用apache的commons fileupload实现,org.springframework.web.multipart.cos.CosMultipartResolver使用Oreilly Cos实现,因此必须选择这两个实现类中的一个,然后添加到DispatcherServlet的WebApplicationContext,例如如果使用commons upload则添加上面的代码到XML,这样CommonsMultipartResolver/CosMultipartResolver将负责分析当前multipart的请求.