string filePath = Server.MapPath("~/model/模板.xls");//路径
FileInfo fileInfo = new FileInfo(filePath);
System.Web.HttpContext.Current.Response.Charset = "GB2312";
System.Web.HttpContext.Current.Response.ContentEncoding = System.Text.Encoding.UTF8;
System.Web.HttpContext.Current.Response.AppendHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode("模板.xls", System.Text.Encoding.UTF8).ToString());
System.Web.HttpContext.Current.Response.ContentType = "application/ms-excel";
System.Web.HttpContext.Current.Response.WriteFile(fileInfo.FullName);
System.Web.HttpContext.Current.Response.Flush();
System.Web.HttpContext.Current.Response.End();