Web上传文件报错java.lang.IllegalArgumentException: Expected MultipartHttpServletRequest

Web上传文件时报错：java.lang.IllegalArgumentException: Expected MultipartHttpServletRequest: is a MultipartResolver configured?
解决方案：检查jar包，完毕无误后在Spring MVC的配置文件中加入

<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
    <property name="maxInMemorySize">
        <value>1638400value>
    property>
bean>