SpringMVC文件上传报错org.apache.catalina.connector.RequestFacade cannot be cast to org.springframework.web.multipart.MultipartHttpServletRequest

错误信息：

java.lang.ClassCastException: org.apache.catalina.connector.RequestFacade cannot be cast to org.springframework.web.multipart.MultipartHttpServletRequest

	...

	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)

	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)

	at java.lang.reflect.Method.invoke(Method.java:597)

	at org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:213)

	at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:126)

	at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:96)

	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:617)

	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:578)

	at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:80)

	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:923)

	at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:852)

	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:882)

	at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:789)

	at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)

	at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)

	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)

	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)

	at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)

	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)

	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)

	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)

	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)

	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)

	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)

	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)

	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)

	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)

	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:852)

	at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)

	at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)

	at java.lang.Thread.run(Thread.java:619)

错误定位：

	MultipartHttpServletRequest mulRequest = (MultipartHttpServletRequest) request;

解决办法：

　　步骤一：Spring配置文件中添加配置

<bean id="multipartResolver"

	    class="org.springframework.web.multipart.commons.CommonsMultipartResolver">

	    <property name="maxUploadSize" value="10485760"/>

	    <property name="maxInMemorySize" value="40960" />

</bean>

　　步骤二：前端页面的form表单中添加： enctype ="multipart/form-data"

<form id="fileForm" method="POST" enctype="multipart/form-data" action="/InvalidCard/DoForExcel">

　　两个步骤后我的问题解决了，如果你的问题仍然存在，请留言联系我。

另：如果完成步骤一二后，报此异常：

java.lang.NoClassDefFoundError: org/apache/commons/fileupload/FileItemFactory

	at java.lang.Class.getDeclaredConstructors0(Native Method)

	at java.lang.Class.privateGetDeclaredConstructors(Class.java:2389)

	at java.lang.Class.getDeclaredConstructors(Class.java:1836)

	at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.determineCandidateConstructors(AutowiredAnnotationBeanPostProcessor.java:229)

	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.determineConstructorsFromBeanPostProcessors(AbstractAutowireCapableBeanFactory.java:962)

	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:935)

	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:485)

	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:456)

	at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:294)

	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:225)

	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:291)

	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:193)

	at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:585)

	at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:913)

...

　　请在pom文件中添加：

<dependency>

		<groupId>commons-fileupload</groupId>

		<artifactId>commons-fileupload</artifactId>

		<version>1.3.1</version>

</dependency>

　　

SpringMVC文件上传报错org.apache.catalina.connector.RequestFacade cannot be cast to org.springframework.web.multipart.MultipartHttpServletRequest的相关教程结束。