前端以字节流形式下载文件

前端代码：

   <script type="text/javascript">
            function downLoad(){
			    var blob = this.dataURLtoBlob("这里放字节流字符串");
				var downloadUrl = window.URL.createObjectURL(blob);
				var anchor = document.createElement("a");
				anchor.href = downloadUrl;
				anchor.download = decodeURI("");
				anchor.click();
			}

			function dataURLtoBlob(base64Str) {
				  var bstr = atob(base64Str),
				   n = bstr.length,
				   u8arr = new Uint8Array(n);
				   while (n--) {
					u8arr[n] = bstr.charCodeAt(n);
				   }
			           // 下载的是excel格式的文件
				return new Blob([u8arr], { type: "application/vnd.ms-excel" });
			}

	
	</script>

　　后端方法：

        using Aspose.Cells

        /// <summary>
        /// 读取模板并写入数据-文件流
        /// </summary>
        /// <param name="paramsData"></param>
        /// <returns></returns>
        public virtual string GetAssetPackInfoFile(InputZcSyQueryDto paramsData)
        {
            List<AssetPackReturnResultDto> list = GetAssetPackInfoList(paramsData);
            string templateFullPath = ImportConst.WAssetPackExcelImport; //模板路径
            //输出文件
            using (FileStream file = new FileStream(templateFullPath, FileMode.Open))
            {
                Workbook workbook = new Workbook(file);
                Worksheet ws = workbook.Worksheets[0];
                //将list数据写入excel
                for (int i = 0; i < list.Count; i++)
                {
                    var currentRow = list[i];
                    WriteCellData(ws, i + 1, 0, currentRow.Name);
                    WriteCellData(ws, i + 1, 1, currentRow.Time);
                    WriteCellData(ws, i + 1, 2, currentRow.Ztze);
                    WriteCellData(ws, i + 1, 3, currentRow.Mwysr);
                    WriteCellData(ws, i + 1, 4, currentRow.Lce);
                    WriteCellData(ws, i + 1, 5, currentRow.Jwysr);
                    WriteCellData(ws, i + 1, 6, currentRow.Xmfg);
                    WriteCellData(ws, i + 1, 7, currentRow.Hbl);
                }

                MemoryStream ms = workbook.SaveToStream();
                var buffer = new byte[ms.Length];
                ms.Position = 0;
                ms.Read(buffer, 0, (int)ms.Length);
                ms.Flush();
                ms.Close();

                return Convert.ToBase64String(buffer);
            }
        }

　　公共方法：

        /// <summary>
        /// 向excel中单元格写入数据
        /// </summary>
        /// <param name="dataSheet">数据工作表</param>
        /// <param name="rowIndex">行</param>
        /// <param name="cellIndex">列</param>
        /// <param name="value">值</param>
        private void WriteCellData(Worksheet dataSheet, int rowIndex, int cellIndex, object value)
        {
            //获取单元格
            var cell = dataSheet.Cells[rowIndex, cellIndex];
            cell.PutValue(value.ToString(), true);
        }

　　获取模板：

        public static readonly string WAssetPackExcelImport = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, @"Customize\App_Data\Zgxt\Xxpl\ExcelConfig\XXX.xlsx");