java.lang.IllegalArgumentException Expected MultipartHttpServletRequest

解决方案：检查jar包，完毕无误后在Spring MVC的配置文件中加入:

<!--
     需要文件上传功能时，启用以下配置
     设置最大上传文件大小   10M=10*1024*1024(B)=10485760 bytes
 --> 

<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
      <property name="maxInMemorySize">
      <value>10485760 </value>
</property></bean>