一、EXCEL ?導入（Excel 導入導出實際項目中會被封裝成**Helper 本示例只對簡單功能做演示）

NPOI 包引用

視圖view

@{ViewBag.Title = "NPOIExcel"; }<h2>NPOIExcel</h2> <form action="@Url.Action("NPOIInport", "Home")" method="post" enctype="multipart/form-data"><input type="file" name="Importexcelfile" /><button type="submit">提交</button> </form>//enctype="multipart/form-data" 上傳文件時form 表單必加

Action

命名空間引用

using NPOI.SS.UserModel;
using NPOI.HSSF.UserModel;
using NPOI.XSSF.UserModel;
using System.Data;

/// <summary>/// NPOI 導入excel/// </summary>/// <returns></returns> [HttpPost]public ActionResult NPOIInport(){bool isok = false;string msg = string.Empty;var file = Request.Files["Importexcelfile"];//接收的文件對象var filename = SaveUploadExcel(file);//將文件保存至某一路徑下 并形成新的文件名稱var filePath=System.Configuration.ConfigurationManager.AppSettings["Upload"] + @"\excel\" + filename;//新路徑IWorkbook workbook = null; //定義工作簿接口ISheet sheet=null;//定義sheet表DataTable data = new DataTable();FileStream filestream = new FileStream(filePath, FileMode.Open, FileAccess.Read);if (file.ContentLength>0){if (filePath.IndexOf(".xlsx") > 0){workbook = new XSSFWorkbook(filestream);//.xlsx 文件 }else{workbook = new HSSFWorkbook(filestream);//.xls文件 }sheet = workbook.GetSheetAt(0);//默認第一個sheet sheet 下標//sheet = workbook.GetSheet("sheet的名字");//獲取想要查詢sheet的名字if (sheet!=null){for (int i = 0; i < sheet.LastRowNum; i++){IRow row = sheet.GetRow(i);//獲取第一行 一般都是表頭var firstvalue = row.GetCell(0);//第一行的第一列var secondvalue = row.GetCell(1);}//常見讀取excel 已經夠用 實際項目中會遇到 再次封裝數據形成table 一般這個幫助類會叫**HelperIRow firstrow = sheet.GetRow(0);int cellcount = firstrow.LastCellNum;//總列數for (int i = firstrow.FirstCellNum; i < cellcount; i++){ICell icell = firstrow.GetCell(i);if (icell!=null){string cellvalue = icell.StringCellValue;//獲取當前單元格的valueDataColumn column = new DataColumn(cellvalue);data.Columns.Add(column);//添加表頭 }}int startrow = sheet.FirstRowNum + 1;for (int i = startrow; i < sheet.LastRowNum; i++){IRow row = sheet.GetRow(i);if (row!=null){DataRow datarow = data.NewRow();for (int j = row.FirstCellNum; j < cellcount; j++){if (row.GetCell(j)!=null){datarow[j] = row.GetCell(j).ToString();}}data.Rows.Add(datarow);}}//return data; }}return Json(new { Isok = isok, Msg = msg });}public static string SaveUploadExcel(HttpPostedFileBase fileexcel){string filename = fileexcel.FileName;string extension = Path.GetExtension(filename);int filesize = fileexcel.ContentLength;if (filesize>int.Parse(System.Configuration.ConfigurationManager.AppSettings["UploadFileSize"])){return "文件超過上限";}string dirPath = System.Configuration.ConfigurationManager.AppSettings["Upload"] + @"\excel\";//生成新的文件名string newFileName = string.Format("{0}{1}", DateTime.Now.ToString("yyMMddHHmmssfffffff"), extension);if (!Directory.Exists(dirPath))Directory.CreateDirectory(dirPath);fileexcel.SaveAs(dirPath + newFileName);//返回新生成的文件名稱return newFileName;} View Code

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二、EXCEL 導出

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轉載于:https://www.cnblogs.com/eric-gms/p/6907595.html

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