asp.net NPOI导入Excel(兼容xls\xlsx) Or 导出Excel
一、NPOI下载
百度网盘下载：:
链接：https://pan.baidu.com/s/1eR_t-vo5UcsVph41YDa66A
提取码：9ax3
二、导入Excel(兼容xls,xlsx）
/// <summary> /// 将excel导入到datatable /// </summary> /// <param name="filePath">excel路径</param> /// <param name="isColumnName">第一行是否是列名</param> /// <returns>返回datatable</returns> public static DataTable ExcelToDataTable(string filePath, bool isColumnName) { DataTable dataTable = null; FileStream fs = null; DataColumn column = null; DataRow dataRow = null; IWorkbook workbook = null; ISheet sheet = null; IRow row = null; ICell cell = null; int startRow = 0; try { using (fs = File.OpenRead(filePath)) { // 2007版本 if (filePath.IndexOf(".xlsx") > 0) workbook = new XSSFWorkbook(fs); // 2003版本 else if (filePath.IndexOf(".xls") > 0) workbook = new HSSFWorkbook(fs); if (workbook != null) { sheet = workbook.GetSheetAt(0);//读取第一个sheet，当然也可以循环读取每个sheet dataTable = new DataTable(); if (sheet != null) { int rowCount = sheet.LastRowNum;//总行数 if (rowCount > 0) { IRow firstRow = sheet.GetRow(0);//第一行 int cellCount = firstRow.LastCellNum;//列数 //构建datatable的列 if (isColumnName) { startRow = 1;//如果第一行是列名，则从第二行开始读取 for (int i = firstRow.FirstCellNum; i < cellCount; ++i) { cell = firstRow.GetCell(i); if (cell != null) { if (cell.StringCellValue != null) { column = new DataColumn(cell.StringCellValue); dataTable.Columns.Add(column); } } } } else { for (int i = firstRow.FirstCellNum; i < cellCount; ++i) { column = new DataColumn("column" + (i + 1)); dataTable.Columns.Add(column); } } //填充行 for (int i = startRow; i <= rowCount; ++i) { row = sheet.GetRow(i); if (row == null) continue; dataRow = dataTable.NewRow(); for (int j = row.FirstCellNum; j < cellCount; ++j) { cell = row.GetCell(j); if (cell == null) { dataRow[j] = ""; } else { //CellType(Unknown = -1,Numeric = 0,String = 1,Formula = 2,Blank = 3,Boolean = 4,Error = 5,) switch (cell.CellType) { case CellType.BLANK: dataRow[j] = ""; break; case CellType.NUMERIC: short format = cell.CellStyle.DataFormat; //对时间格式（2015.12.5、2015/12/5、2015-12-5等）的处理 if (format == 14 || format == 31 || format == 57 || format == 58) dataRow[j] = cell.DateCellValue; else dataRow[j] = cell.NumericCellValue; break; case CellType.STRING: dataRow[j] = cell.StringCellValue; break; } } } dataTable.Rows.Add(dataRow); } } } } } return dataTable; } catch (Exception ex) { if (fs != null) { fs.Close(); } return null; } }
三、导出Excel
#region 导出方法(NPOI) /// <summary> /// 合并单元格 /// </summary> /// <param name="sheet"></param> /// <param name="firstRow"></param> /// <param name="lastRow"></param> /// <param name="firstCell"></param> /// <param name="lastCell"></param> private void mergeCell(ISheet sheet, int firstRow, int lastRow, int firstCell, int lastCell) { sheet.AddMergedRegion(new CellRangeAddress(firstRow, lastRow, firstCell, lastCell));//2.0使用 2.0以下为Region } //Datatable导出Excel private void GridToExcelByNPOI(System.Data.DataTable dt, string strExcelFileName, string title) { try { dt.Columns["row"].SetOrdinal(0); dt.Columns["row"].ColumnName = "序号"; } catch { } HSSFWorkbook workbook = null; try { workbook = new HSSFWorkbook(); ISheet sheet = workbook.CreateSheet("Sheet1"); ICellStyle HeadercellStyle = workbook.CreateCellStyle(); HeadercellStyle.BorderBottom = NPOI.SS.UserModel.BorderStyle.Thin; HeadercellStyle.BorderLeft = NPOI.SS.UserModel.BorderStyle.Thin; HeadercellStyle.BorderRight = NPOI.SS.UserModel.BorderStyle.Thin; HeadercellStyle.BorderTop = NPOI.SS.UserModel.BorderStyle.Thin; HeadercellStyle.Alignment = NPOI.SS.UserModel.HorizontalAlignment.Center; //字体 NPOI.SS.UserModel.IFont headerfont = workbook.CreateFont(); headerfont.Boldweight = (short)FontBoldWeight.Bold; HeadercellStyle.SetFont(headerfont); IRow headerTitle = sheet.CreateRow(0); ICell cell1 = headerTitle.CreateCell(0); cell1.SetCellValue(title); mergeCell(sheet, 0, 0, 0, dt.Columns.Count - 1);//合并单元格 HSSFCellStyle fCellStyle = (HSSFCellStyle)workbook.CreateCellStyle(); HSSFFont ffont = (HSSFFont)workbook.CreateFont(); ffont.FontHeight = 20 * 20; ffont.FontName = "宋体"; //ffont.Color = HSSFColor.Red.Index; fCellStyle.SetFont(ffont); fCellStyle.VerticalAlignment = NPOI.SS.UserModel.VerticalAlignment.Center;//垂直居中 fCellStyle.Alignment = NPOI.SS.UserModel.HorizontalAlignment.Center;//水平居中 cell1.CellStyle = fCellStyle; //用column name 作为列名 int icolIndex = 0; IRow headerRow = sheet.CreateRow(1); foreach (DataColumn item in dt.Columns) { ICell cell = headerRow.CreateCell(icolIndex); cell.SetCellValue(item.ColumnName); cell.CellStyle = HeadercellStyle; icolIndex++; } ICellStyle cellStyle = workbook.CreateCellStyle(); //为避免日期格式被Excel自动替换，所以设定 format 为 『@』 表示一率当成text來看 cellStyle.DataFormat = HSSFDataFormat.GetBuiltinFormat("@"); cellStyle.BorderBottom = NPOI.SS.UserModel.BorderStyle.Thin; cellStyle.BorderLeft = NPOI.SS.UserModel.BorderStyle.Thin; cellStyle.BorderRight = NPOI.SS.UserModel.BorderStyle.Thin; cellStyle.BorderTop = NPOI.SS.UserModel.BorderStyle.Thin; NPOI.SS.UserModel.IFont cellfont = workbook.CreateFont(); cellfont.Boldweight = (short)FontBoldWeight.Normal; cellStyle.SetFont(cellfont); //建立内容行 int iRowIndex = 2; int iCellIndex = 0; foreach (DataRow Rowitem in dt.Rows) { IRow DataRow = sheet.CreateRow(iRowIndex); foreach (DataColumn Colitem in dt.Columns) { ICell cell = DataRow.CreateCell(iCellIndex); try { if (Colitem.ColumnName.Contains("编号")) { cell.SetCellValue(Rowitem[Colitem].ToString()); } else { cell.SetCellValue(Convert.ToDouble(Rowitem[Colitem].ToString())); } } catch { cell.SetCellValue(Rowitem[Colitem].ToString()); } cell.CellStyle = cellStyle; iCellIndex++; } iCellIndex = 0; iRowIndex++; } //自适应列宽度 for (int i = 0; i < icolIndex; i++) { sheet.AutoSizeColumn(i); } //设置Excel的自动筛选 //CellRangeAddress c = CellRangeAddress.ValueOf("A1"); //sheet.SetAutoFilter(c); //写Excel MemoryStream ms = new MemoryStream(); workbook.Write(ms); Response.AppendHeader("content-disposition", "attachment;filename=" + strExcelFileName); Response.BinaryWrite(ms.ToArray()); workbook = null; ms.Close(); ms.Dispose(); Response.End(); } catch (Exception ex) { ClientScript.RegisterStartupScript(GetType(), "type1", "<script>alert('" + ex.Message + "')</script>"); } finally { if (workbook != null) workbook = null; } } #endregion
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