NPOI可以在没有安装Office的情况下对Word或Excel文档进行读写操作
下面介绍下NPOI操作Excel的方法
首先我们需要下载NPOI的程序集
下载地址 http://npoi.codeplex.com/releases
我下载下来是有这两个文件
这里使用的是net4.0
将下面几个dll添加到项目中并引用
废话不多说 上代码
/// <summary> /// create 2016-11-30 by sly /// 将DataTable数据导入到excel中 此方法直接返回文件给浏览器下载 /// </summary> /// <param name="data">要导入的数据</param> /// <param name="isColumnWritten">DataTable的列名是否要导入</param> /// <param name="sheetName">要导入的excel的sheet的名称</param> /// <param name="widthDic">要设置的宽度(key 列下标,val 宽度大小)</param> /// <returns></returns> public int DataTableToExcel(DataTable data, string sheetName, bool isColumnWritten, Dictionary<int, int> widthDic = null) { int i = 0; int j = 0; int count = 0; ISheet sheet = null; MemoryStream file = new MemoryStream(); if (fileName.IndexOf(".xlsx") > 0) //2007版本 workbook = new XSSFWorkbook(); else if (fileName.IndexOf(".xls") > 0) // 2003版本 workbook = new HSSFWorkbook(); try { if (workbook != null) { sheet = workbook.CreateSheet(sheetName); //设置所有列宽 for (int l = 0; l <= data.Rows.Count; l++) { sheet.DefaultColumnWidth = 12; } if (widthDic != null) { //设定自定义宽度 foreach (var item in widthDic) { sheet.SetColumnWidth(item.Key, item.Value); } } } else { return -1; } if (isColumnWritten == true) //写入DataTable的列名 { IRow row = sheet.CreateRow(0); for (j = 0; j < data.Columns.Count; ++j) { row.CreateCell(j).SetCellValue(data.Columns[j].ColumnName); } count = 1; } else { count = 0; } int outRes = -1; for (i = 0; i < data.Rows.Count; ++i) { IRow row = sheet.CreateRow(count); for (j = 0; j < data.Columns.Count; ++j) { if (int.TryParse(data.Rows[i][j].ToString(), out outRes)) { row.CreateCell(j).SetCellValue(Convert.ToInt32(data.Rows[i][j].ToString())); } else { if (!string.IsNullOrEmpty(data.Rows[i][j].ToString()) && data.Rows[i][j].ToString().Length > 10) { if ((data.Rows[i][j].ToString().Substring(0, 7) == "http://" || data.Rows[i][j].ToString().Substring(0, 8) == "https://")) { var TCell = row.CreateCell(j); HSSFHyperlink link = new HSSFHyperlink(HyperlinkType.Url);//建一个HSSFHyperlink实体，指明链接类型为URL TCell.SetCellValue(data.Rows[i][j].ToString()); link.Address = data.Rows[i][j].ToString();//给HSSFHyperlink的地址赋值 TCell.Hyperlink = link; } else { row.CreateCell(j).SetCellValue(data.Rows[i][j].ToString()); } } else { row.CreateCell(j).SetCellValue(data.Rows[i][j].ToString()); } } } ++count; } workbook.Write(file); //写入到excel var context = System.Web.HttpContext.Current; context.Response.ContentType = "application/vnd.ms-excel"; context.Response.AddHeader("Content-Disposition", string.Format("attachment;filename={0}", fileName)); context.Response.Clear(); context.Response.BinaryWrite(file.GetBuffer()); context.Response.End(); return count; } catch (Exception ex) { return -2; } }
/// <summary> /// 将excel中的数据导入到DataTable中 /// </summary> /// <param name="sheetName">excel工作薄sheet的名称</param> /// <param name="isFirstRowColumn">第一行是否是DataTable的列名</param> /// <returns></returns> public DataTable ExcelToDataTable(string sheetName, bool isFirstRowColumn) { ISheet sheet = null; DataTable data = new DataTable(); int startRow = 0; try { fs = new FileStream(fileName, FileMode.Open, FileAccess.Read); if (fileName.IndexOf(".xlsx") > 0) // 2007版本 workbook = new XSSFWorkbook(fs); else if (fileName.IndexOf(".xls") > 0) // 2003版本 workbook = new HSSFWorkbook(fs); if (sheetName != null) { sheet = workbook.GetSheet(sheetName); if (sheet == null) //如果没有找到指定的sheetName对应的sheet，则尝试获取第一个sheet { sheet = workbook.GetSheetAt(0); } } else { sheet = workbook.GetSheetAt(0); } if (sheet != null) { IRow firstRow = sheet.GetRow(0); int cellCount = firstRow.LastCellNum; //一行最后一个cell的编号 即总的列数 if (isFirstRowColumn) { for (int i = firstRow.FirstCellNum; i < cellCount; ++i) { ICell cell = firstRow.GetCell(i); if (cell != null) { string cellValue = cell.StringCellValue; if (cellValue != null) { DataColumn column = new DataColumn(cellValue); data.Columns.Add(column); } } } startRow = sheet.FirstRowNum + 1; } else { startRow = sheet.FirstRowNum; } //最后一列的标号 int rowCount = sheet.LastRowNum; for (int i = startRow; i <= rowCount; ++i) { IRow row = sheet.GetRow(i); if (row == null) continue; //没有数据的行默认是null DataRow dataRow = data.NewRow(); for (int j = row.FirstCellNum; j < cellCount; ++j) { if (row.GetCell(j) != null) //同理，没有数据的单元格都默认是null dataRow[j] = row.GetCell(j).ToString(); } data.Rows.Add(dataRow); } } return data; } catch (Exception ex) { return null; } }
/// <summary> /// 合并单元格 /// </summary> /// <param name="sheet">要合并单元格所在的sheet</param> /// <param name="rowstart">开始行的索引</param> /// <param name="rowend">结束行的索引</param> /// <param name="colstart">开始列的索引</param> /// <param name="colend">结束列的索引</param> public static void SetCellRangeAddress(ISheet sheet, int rowstart, int rowend, int colstart, int colend) { CellRangeAddress cellRangeAddress = new CellRangeAddress(rowstart, rowend, colstart, colend); sheet.AddMergedRegion(cellRangeAddress); }
//调用导出方法 new Helper.ExcelHelper("导出的文件名.xls").DataTableToExcel(dt, "sheet1", true, null); new Helper.ExcelHelper("导出的文件名.xlsx").DataTableToExcel(dt, "sheet1", true, null);
下面是导入
<input type="file" name="fileField" class="file" id="fileField" value="导入" style="display: none;" /> <script> $("#fileField").live("change", function () { var Reg = new RegExp("^.+\.(xls)"); var Reg2 = new RegExp("^.+\.(xlsx)"); if (Reg.test($(this).val()) || Reg.test2($(this).val())) { ImportGrade();//此处调用后台导入方法，这里就不写了哈 } else { $.IvanDialogOpen({ "Type": "tips", "Info": "仅支持 .xls ，.xlsx 文件", "Plugins": { CloseTime: 800 } }); } }) </script>
/// <summary> /// 导入Demo /// </summary> /// <param name="filePath"></param> /// <returns></returns> public ActionResult ImportGrade(string filePath) { //获取文件在服务器上的路径 string path = string.Concat(FileUpload.GetFilePath(UploadType.ImportGradeFile), filePath); //根据上传路径获取表格数据 ExcelHelper eh = new ExcelHelper(path.Replace("\\", "/")); DataTable dt = eh.ExcelToDataTable("Sheet1", true); return Content(""); }
以上就是NPOI的简单使用方法
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