java.lang.IllegalArgumentException: Expected MultipartHttpServletRequest: is a MultipartResolver con

<dependency>
<groupId>commons-fileupload</groupId>
<artifactId>commons-fileupload</artifactId>
<version>1.3.1</version>
</dependency>
<dependency>
<groupId>commons-io</groupId>
<artifactId>commons-io</artifactId>
<version>2.4</version>

</dependency>

<!-- 文件上传 -->
<bean id="multipartResolver"class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
<propertyname="maxUploadSize"value="5242880"/>
</bean>

重点是id 为multipartResolver 要为这个不然spring容器找不到。