<div class="upload">

    <div class="uploadswf">

           <input type="file" name="uploadify" id="uploadify" style="vertical-align: middle;" />

                 <span id="docspan"></span>

                 <p id="fileQueue" style="color:black; background-color:#3C8DBC;"></p>

      </div>

 </div>

     <script type="text/javascript">

         $(function () {

             $("#uploadify").uploadify({

                 'uploader': '/plugins/uploadify-v2.1.4/uploadify.swf',

                 'script': '/Logistics/FileUpload?lcid='+id,

                 'cancelImg': '/plugins/uploadify-v2.1.4/cancel.png"',

                 'folder': '/Areas/Admin/UploadFile/ContractAtt/',

                 'queueID': 'fileQueue',

                 'auto': true,

                 'multi': false,

                 'method': 'post',

                 'fileExt': '*.jpg;*.png;*.doc;*.docx;*.xls;*.xlsx;*.zip;*.rar;',

                 'fileDesc': '请选择 jpg png doc docx xls xlsx zip rar 文件',

                 'scriptData': null,

                 'sizeLimit': 314572800,

                 'buttonText': '上传文件',

                 'onComplete': function (event, queueID, fileObj, respose, data) {

                     var data = $.parseJSON(respose);

                     if (data.err) {

                         $.tooltip("上传成功！", 2500, true);

                         return false;

                     }

                 }

             })

         })

 <script>

         [HttpPost]

         public JsonResult FileUpload(HttpPostedFileBase fileData)

         {

             if (fileData != null)

             {

                 int lcId = Convert.ToInt32(Request["lcid"]);

                 try

                 {

                     string filePath = Server.MapPath("/Areas/Admin/UploadFile/ContractAtt");

                     string fileName = Path.GetFileName(fileData.FileName);//原始文件名

                     string fileExtension = Path.GetExtension(fileName);//扩展名

                     string saveName = lcId +"_"+ DateTime.Now.ToString("yyyyMMddhhmmss");//保存服务器文件名

                     string att = "/Areas/Admin/UploadFile/ContractAtt/" + saveName;

                     if (lcService.UpdataAtt(lcId, att))

                     {

                         fileData.SaveAs(filePath +"\\"+ saveName+fileExtension);

                         return Json(new { err = true, FileName = fileName, SavaName = saveName });

                     }

                     else

                     {

                         return Json(new { err = false, Message = "系统错误！" }, JsonRequestBehavior.AllowGet);

                     }

                 }

                 catch (Exception ex)

                 {

                     return Json(new { ess = false, Message = ex.Message }, JsonRequestBehavior.AllowGet);

                 }

             }

             else

             {

                 return Json(new { err = false, Message = "请选择要上传的文件！" }, JsonRequestBehavior.AllowGet);

             }

         }