上传图片java.lang.IllegalArgumentException: Expected MultipartHttpServletRequest: is a MultipartResolver configured?

<!-- 配置多媒体解析器 -->
    <!-- 定义文件上传解析器 -->
    <bean 
        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>