jquery ajax file upload NET MVC 無重新整理檔案上傳

網上有各種各樣的檔案上傳方法，有基於JS框架的、也有基於flash swf外掛的。

這次分享一個比較簡單而且實用能快速上手的檔案上傳方法，主要步驟：

1.引用Jquery包，我用的是jquery-1.11.3.min.js 版本

2.編寫JS程式碼

3.HTML中增加type=file控制元件

程式碼如下：

HTML程式碼：

    <form id="fileupload" method="post"  enctype = "multipart/form-data">
         <input type="file" id="fileid" name="fileid" accept="application/vnd.ms-excel">
　　　　　<input type="button" id="confirmuploadid" value="上傳" />
    </form> 

//JS實現

   $(`#confirmuploadid`).on(`click`, function () {
    uploadProduct();

   });

function uploadProduct() {
    var formid = $("#fileupload");
     var fd = new FormData(formid[0]);  //form表單的方式例項化一個formData
    fd.append(`file`, $(`#fileid`)[0].files);
    fd.append(`userid`, userid);
    $.ajax({
        url: `File/Setting`,
        type: `POST`,
        dataType: `JSON`,
        data: fd,
        async: false,
        cache: false,
        contentType: false,
        processData: false,
        beforeSend: function () {
            $("#confirmuploadid").prop("disabled", true);
        },
        success: function (returndata) {
           $("#confirmuploadid").prop("disabled", false);
            alert(returndata.Message);
        },
        error: function (returndata) {
            alert("上傳失敗,請檢查資料正確性,如：有些數字輸入項，是否輸入了字元！");
        }
    });
}        

 
//MVC實現
public class FileController : Controller
    {
        [HttpPost]
        public ActionResult Setting()
        {
            string userid = "1"; string username = "1";
            FunctionBackMessage functionBackMessage = new FunctionBackMessage();
            functionBackMessage.IsSuccess = false;
            functionBackMessage.Message="上傳失敗，稍後重試！";
            if (!string.IsNullOrEmpty(username))
            {
                HttpFileCollectionBase files = Request.Files;
                string _urlstr = Request.Url.AbsoluteUri;
                FunctionBackMessage fc = new FunctionBackMessage();
                fc.IsSuccess = true; fc.Message = "上傳成功";
                if (files.AllKeys.Length > 0)
                {
                    for (int i = 0; i < files.AllKeys.Length; i++)
                    {
                        var myFile = files[i];
                        double myFileLength = myFile.ContentLength / 1024.0 / 1024.0;
                        int InputMediaExcelLength = !string.IsNullOrEmpty(Global.GetAppString("InputMediaExcelLength")) ? int.Parse(Global.GetAppString("InputMediaExcelLength")) : 50; 

                        if (myFileLength > InputMediaExcelLength)//超出指定大小
                        {
                            fc.IsSuccess = false; fc.Message = "為了保證資料處理效率，每次上傳檔案小於" + InputMediaExcelLength + "M,如超出請拆分記錄分多次上傳！";
                        }
                        else
                        {
                        //    string projectId = context.Request["projectId"];
                        //    string username = context.Request["username"];
                            if ((!Path.GetExtension(myFile.FileName).Contains("xls") && !Path.GetExtension(myFile.FileName).Contains("xlsx")))
                            {
                                functionBackMessage.IsSuccess = false; functionBackMessage.Message = "請上傳Excel格式檔案！";
                                return Json(functionBackMessage, "application/json");
                            }
                          //檔案儲存  
                            string uploadPath = HttpContext.Current.Server.MapPath("/tempfile") + "\";//伺服器臨時路徑(不含檔名和字尾)
                            if (!Directory.Exists(uploadPath))
                            {
                                Directory.CreateDirectory(uploadPath);
                            }
                            string fileName = DateTime.Now.Ticks + "_" + myFile.FileName;
                            string fileFull = uploadPath + fileName;//檔案路徑,包含檔名和字尾

                            try
                            {

                                myFile.SaveAs(fileFull);//儲存檔案
                            }
                            catch (Exception ex)
                            {
                                com.log.Loger.Debug("uploadMediaSource 儲存檔案失敗", ex);
                            }
                          

                        }
                    }
                }
                else
                {
                    functionBackMessage.IsSuccess = false; functionBackMessage.Message = "沒有獲取到上傳檔案";
                }
            }
            return Json(functionBackMessage, "application/json");
        }
    }