轉自：https://blog.csdn.net/iteye_17476/article/details/82651580

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

一、詳細的錯誤資訊（解決方法在下面）：

1.   java.lang.ClassCastException: org.apache.catalina.connector.RequestFacade cannot be cast to org.springframework.web.multipart.MultipartHttpServletRequest
2.   at com.lqy.spring.iwx.controller.BaseController.getFileEntityAfterUpoad(BaseController.java:429)
3.   at com.lqy.spring.iwx.controller.backend.weixin.WxMaterialController.uploadMaterial(WxMaterialController.java:192)
4.   at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
5.   at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
6.   at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
7.   at java.lang.reflect.Method.invoke(Unknown Source)
8.   at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:222)
9.   at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:137)
10.   at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:110)
11.   at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:775)
12.   at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:705)
13.   at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85)
14.   at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:959)
15.   at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:893)
16.   at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:965)
17.   at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:867)
18.   at javax.servlet.http.HttpServlet.service(HttpServlet.java:650)
19.   at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:841)
20.   at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
21.   at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
22.   at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
23.   at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:85)
24.   at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
25.   at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
26.   at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
27.   at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)
28.   at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
29.   at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:505)
30.   at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170)
31.   at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
32.   at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:957)
33.   at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
34.   at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:423)
35.   at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1079)
36.   at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:620)
37.   at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:318)
38.   at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)
39.   at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
40.   at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
41.   at java.lang.Thread.run(Unknown Source)

二、解決方法：在SpringMvc.xml檔案中增加Spring檔案上傳的解析器，如下

<!-- 上傳檔案攔截，設定最大上傳檔案大小 10M=10*1024*1024(B)=10485760 bytes -->
	<bean id="multipartResolver"
		class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
		<property name="maxUploadSize" value="10485760" />
		<!-- resolveLazily屬性啟用是為了推遲檔案解析，以便在Action 中捕獲檔案大小異常 -->
		<property name="resolveLazily" value="true" />
		<property name="defaultEncoding" value="UTF-8" />
	</bean>