道理相通，我简单分享下在.net MVC下的实装。

1.制作Model类

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;

namespace RCRS.WebApp.LG.EM.Models
{
 //----------------------------------------------------------------
 /// <summary>
 /// Import画面用
 /// </summary>
 //----------------------------------------------------------------
 public class tmp_UploadFile
 {
  /// <summary></summary>
  public HttpPostedFileBase FileName { get; set; }
 }
}

2.实装controller里的对应方法，我这个处理逻辑比较复杂，懒得修改了，反正就这个意思

//----------------------------------------------------------------
  /// <summary>
  /// アップロ?ド
  /// </summary>
  /// <returns></returns>
  //----------------------------------------------------------------
  [HttpPost]
  public virtual ActionResult UploadFile()
  {
   HttpPostedFileBase uploadedFile = Request.Files["FileName"];
   string message = "アップロ?ド失?·筏蓼筏俊?;
   bool isUploaded = false;
   string path = "";
   string dateTimeNow = DateTime.Now.ToString("yyMMdd-hhmmss");
   string userName = User.Identity.GetUserName();
   string uploadMsg = string.Empty;

   if (uploadedFile != null && uploadedFile.ContentLength != 0)
   {
    string pathForSaving = Server.MapPath("~/App_Data/Uploaded/");
    try
    {
     if (BsnssBihin.IsExcel(uploadedFile.FileName))
     {
      path = System.IO.Path.Combine(pathForSaving, dateTimeNow + "_" + uploadedFile.FileName);
      uploadedFile.SaveAs(path);
      isUploaded = BsnssBihin.UploadBihinChange(path, userName, ref uploadMsg);
      if (isUploaded)
      {
       message = "アップロ?ド成功しました！" + "n" + uploadMsg;
       Logger.Info("[成功]?淦伐ⅴ氓抓愆`ド, " + dateTimeNow + ", " + "[" + userName + "]" + "[" + path + "]" + uploadMsg);
      }
      else
      {
       message = "アップロ?ド失?·筏蓼筏俊? + "n" + uploadMsg;
       Logger.Info("[失???淦伐ⅴ氓抓愆`ド, " + dateTimeNow + ", " + "[" + userName + "]" + "["+path + "]" + uploadMsg);
      }
     }
     else
     {
      message = "ファイルの形式は不正です。";
     }
    }
    catch (Exception ex)
    {
     message = string.Format("失?·筏蓼筏? {0}", ex.Message);
     Logger.Info("[失???淦伐ⅴ氓抓愆`ド: " + ex.Message + dateTimeNow + ", " + "[" + userName + "]" + "[" + path + "]");
    }
   }
   return Json(new { isUploaded = isUploaded, message = message }, "text/html");
  }

3.页面的实装

@model RCRS.WebApp.LG.EM.Models.tmp_UploadFile
<table align="center" style="margin-bottom:200px">
 <tr>
  <td>
   <div style="width:470px">
    <input type="text" id="tbx-file-path" value="ファイルを??kしてください" readonly="readonly" />
   </div>
  </td>
  <td>
   <div style="width: 60px">
    <span class="btn btn-primary fileinput-button">
     <span>? ?k</span>
     @Html.TextBoxFor(m => m.FileName, new { id = "file-upload", type = "file", accept = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet, application/vnd.ms-excel" })
    </span>
   </div>
  </td>
  <td>
   <div style="width:60px">
    <a class="btn btn-primary" href="http://www.gimoo.net/t/1903/5c9047f97f833.html" id="hl-start-upload">アップロ?ド</a>
   </div>
  </td>
 </tr>
</table>

<div id="loadingOver" class="loadingOver"></div>
<div id="dvloader" class="dvloader">
 <span class="label label-info" style="align-content:center"> ?I理中、少々お待ちください</span><br />
 <br />
 <img id="loadingGif" src="http://www.gimoo.net/t/Content/img/loader.gif" alt="" />
</div>

@section scripts{
 @Scripts.Render("~/bundles/jquery")
 @Scripts.Render("~/bundles/jqueryui")
 @Scripts.Render("~/bundles/jqueryval")
 @Scripts.Render("~/bundles/common")
 @Scripts.Render("~/bundles/fileupload")
 <script type="text/javascript">
  var data_upload;
  $(document).ready(function () {
   'use strict';
   $('#file-upload').fileupload({
    url: '../Bihin/UploadFile',
    dataType: 'json',
    add: function (e, data) {
     data_upload = data;
    },
    done: function (event, data) {
     if (data.result.isUploaded) {
      $("#tbx-file-path").val("ファイルを??kしてください");
      data_upload = "";
     }

     $("#dvloader").css("display", "none");
     $("#loadingOver").css("display", "none");

     alert(data.result.message);
    },
    fail: function (event, data) {
     data_upload = "";
     if (data.files[0].error) {

      $("#dvloader").css("display", "none");
      $("#loadingOver").css("display", "none");

      alert(data.files[0].error);
     }
    }
   });
  });

  $("#hl-start-upload").on('click', function () {
   if (data_upload) {
    $("#dvloader").css("display", "block");
    $("#loadingOver").css("display", "block");
    data_upload.submit();
   }
   return false;
  });

  $("#file-upload").on('change', function () {
   $("#tbx-file-path").val(this.files[0].name);
  });

  </script>
}

√，就是这个样子
还附赠了一个简易loding的实现
贴出CSS代码：

.dvloader {
 display:none;
 position:absolute;
 top:40%;
 left:40%;
 width:20%;
 height:20%;
 z-index:1001;
 text-align:center;
 font-size:1.5em;
}

.loadingOver {
 display:none;
 position:absolute;
 top:0;
 left:0;
 width:100%;
 height:100%;
 background-color:#f5f5f5;
 opacity:0.5;
 z-index:1000;
}

这里，多说一嘴：
关于input 的accept属性，这里只想读入Excel，所以
application/vnd.openxmlformats-officedocument.spreadsheetml.sheet, application/vnd.ms-excel

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