jsp:

<form method="post" action="excel.do?method=inputExcel" enctype="multipart/form-data">
       <table>
        <tr>
         <td>
          <input type="file" name="file"/>
         </td>
        </tr>
        <tr>
         <td>
          <input type="submit" value="上传"/>
         </td>
        </tr>
       </table>
      </form>

前提：将以下两个jar包复制到WEB-INF 文件夹lib下：

commons-io-1.3.2.jar

commons-fileupload.jar

public ModelAndView inputExcel(HttpServletRequest request, HttpServletResponse response){

MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest) request;
 CommonsMultipartFile file = (CommonsMultipartFile) multipartRequest.getFile("file");
// String name = multipartRequest.getParameter("name");
 String realFileName = file.getOriginalFilename();
 //System.out.println("获得文件名：" + realFileName); // 获取路径
 String ctxPath = request.getSession().getServletContext().getRealPath("/")  + "upload/";  // 创建文件
 File dirPath = new File(ctxPath);

if (!dirPath.exists()) {
  dirPath.mkdir();
  }
 
 File uploadFile = new File(ctxPath + realFileName);
 FileCopyUtils.copy(file.getBytes(), uploadFile);

}

application.xml配置：

<!--上传控制-->
<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"
p:defaultEncoding="utf-8">
<property name="maxUploadSize">
<value>104857600</value>
</property>
<property name="maxInMemorySize">
<value>4096</value>
</property> 
</bean>

即可！！