Expected MultipartHttpServletRequest: is a MultipartResolver configured?

1）添加jar 

        <!-- 文件上传组件 -->
        <dependency>
            <groupId>commons-fileupload</groupId>
            <artifactId>commons-fileupload</artifactId>
        </dependency>

2）springmvc.xml

        <!-- 定义文件上传解析器 -->
	<bean id="multipartResolver"
		class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
		<!-- 设定默认编码 -->
		<property name="defaultEncoding" value="UTF-8"></property>
		<!-- 设定文件上传的最大值5MB，5*1024*1024 -->
		<property name="maxUploadSize" value="5242880"></property>
	</bean>