Spring MVC 文件上传接收不到请求参数

少了配置

 <!-- 支持上传文件 -->
    <bean id="multipartResolver"
          class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
        <!-- one of the properties available; the maximum file size in bytes -->
        <property name="maxUploadSize" value="1000000000"/>

    </bean>