<button class="btn btn-success" id="upload">上传文件</button>

 <input type="file" id="btnUpload" name="file" accept=".xls,.xlsx" style="display: none;" />

 <input type="hidden" id="filepath" />

<input type="hidden" id="filename" />

<span id="uploadfilename">未选择任何文件</span></li>

        $("#upload").bind("click", function () {

            //选择上传文件

            $("#btnUpload").click();

        });

                $("#btnUpload").live("change", function () {

            $.ajaxFileUpload({

                url: '/UploadFiles.aspx', //用于文件上传的服务器端请求地址

                secureuri: false, //一般设置为false

                fileElementId: 'btnUpload', //文件上传空间的id属性  <input type="file" id="file" name="file" />

                dataType: 'json', //返回值类型 一般设置为json

                success: function (data, status) //服务器成功响应处理函数

                {

                    $("#filepath").val(data.filepath);

                    $("#filename").val(data.filename);

                    $("#uploadfilename").html(data.filename);

                    $("#btnUpload").val("");

                },

                error: function (data, status, e) //服务器响应失败处理函数

                {

                    alert(e);

                }

            })

        });

    public partial class UploadFiles : System.Web.UI.Page

    {

        protected void Page_Load(object sender, EventArgs e)

        {

            var files = Request.Files;

            string msg = string.Empty;

            string error = string.Empty;

            string filepath;

            string urlpath = HttpContext.Current.Request.Url.Host;

            string uploadurl = Server.MapPath("/") + "Tempalte\\upload\\";//files[0].FileName.Split('.')[files[0].FileName.Split('.').Length-1]

            //string fname = DateTime.Now.ToString("yyMMdHHmmssfff") + System.IO.Path.GetFileName(files[0].FileName);

            string fname = DateTime.Now.ToString("yyMMdHHmmssfff") + System.IO.Path.GetExtension(files[].FileName);

            if (!Directory.Exists(uploadurl))

            {

                Directory.CreateDirectory(uploadurl);

            }

            if (files.Count > )

            {

                files[].SaveAs(uploadurl + fname);

                msg = " 成功! 文件大小为:" + files[].ContentLength;

                filepath = "/Tempalte/upload/" + fname;

                string res = "{ error:'" + error + "', msg:'" + msg + "',filename:'" + files[].FileName + "',filepath:'" + filepath + "'}";

                Response.Write(res);

                Response.End();

            }

        }

    }