using System;using System.Data;using System.IO;using System.Text;using System.Web;using NPOI.HPSF;using NPOI.HSSF.UserModel;using NPOI.SS.UserModel;public class ExcelHelper{ /// <summary> /// DataTable导出到Excel文件 /// </summary> /// <param name="dtSource">源DataTable</param> /// <param name="strHeaderText">表头文本</param> /// <param name="strFileName">保存位置</param> /// <param name="strSheetName">工作表名称</param> /// <Author>柳永法 http://www.yongfa365.com/ 2010-5-8 22:21:41</Author> public static void Export(DataTable dtSource, string strHeaderText, string strFileName, string strSheetName, string[] oldColumnNames, string[] newColumnNames) { if (strSheetName == "") { strSheetName = "Sheet"; } using (MemoryStream ms = Export(dtSource, strHeaderText, strSheetName, oldColumnNames, newColumnNames)) { using (FileStream fs = new FileStream(strFileName, FileMode.Create, FileAccess.Write)) { byte[] data = ms.ToArray(); fs.Write(data, 0, data.Length); fs.Flush(); } } } /// <summary> /// DataTable导出到Excel的MemoryStream /// </summary> /// <param name="dtSource">源DataTable</param> /// <param name="strHeaderText">表头文本</param> /// <param name="strSheetName">工作表名称</param> /// <Author>柳永法 http://www.yongfa365.com/ 2010-5-8 22:21:41</Author> public static MemoryStream Export(DataTable dtSource, string strHeaderText, string strSheetName, string[] oldColumnNames, string[] newColumnNames) { if (oldColumnNames.Length != newColumnNames.Length) { return new MemoryStream(); } HSSFWorkbook workbook = new HSSFWorkbook(); //HSSFSheet sheet = workbook.CreateSheet();// workbook.CreateSheet(); ISheet sheet = workbook.CreateSheet(strSheetName); #region 右击文件 属性信息 { DocumentSummaryInformation dsi = PropertySetFactory.CreateDocumentSummaryInformation(); dsi.Company = "http://....../"; workbook.DocumentSummaryInformation = dsi; SummaryInformation si = PropertySetFactory.CreateSummaryInformation(); if (HttpContext.Current.Session["realname"] != null) { si.Author = HttpContext.Current.Session["realname"].ToString(); } else { if (HttpContext.Current.Session["username"] != null) { si.Author = HttpContext.Current.Session["username"].ToString(); } } //填加xls文件作者信息 si.ApplicationName = "NPOI"; //填加xls文件创建程序信息 si.LastAuthor = "OA系统"; //填加xls文件最后保存者信息 si.Comments = "OA系统自动创建文件"; //填加xls文件作者信息 si.Title = strHeaderText; //填加xls文件标题信息 si.Subject = strHeaderText; //填加文件主题信息 si.CreateDateTime = DateTime.Now; workbook.SummaryInformation = si; } #endregion ICellStyle dateStyle = workbook.CreateCellStyle(); IDataFormat format = workbook.CreateDataFormat(); dateStyle.DataFormat = format.GetFormat("yyyy-mm-dd"); #region 取得列宽 int[] arrColWidth = new int[oldColumnNames.Length]; for (int i = 0; i < oldColumnNames.Length; i++) { arrColWidth[i] = Encoding.GetEncoding(936).GetBytes(newColumnNames[i]).Length; } /* foreach (DataColumn item in dtSource.Columns) { arrColWidth[item.Ordinal] = Encoding.GetEncoding(936).GetBytes(item.ColumnName.ToString()).Length; } * */ for (int i = 0; i < dtSource.Rows.Count; i++) { for (int j = 0; j < oldColumnNames.Length; j++) { int intTemp = Encoding.GetEncoding(936).GetBytes(dtSource.Rows[i][oldColumnNames[j]].ToString()).Length; if (intTemp > arrColWidth[j]) { arrColWidth[j] = intTemp; } } /* for (int j = 0; j < dtSource.Columns.Count; j++) { int intTemp = Encoding.GetEncoding(936).GetBytes(dtSource.Rows[i][j].ToString()).Length; if (intTemp > arrColWidth[j]) { arrColWidth[j] = intTemp; } } * */ } #endregion int rowIndex = 0; foreach (DataRow row in dtSource.Rows) { #region 新建表，填充表头，填充列头，样式 if (rowIndex == 65535 || rowIndex == 0) { if (rowIndex != 0) { sheet = workbook.CreateSheet(strSheetName + ((int)rowIndex/65535).ToString()); } #region 表头及样式 { IRow headerRow = sheet.CreateRow(0); headerRow.HeightInPoints = 25; headerRow.CreateCell(0).SetCellValue(strHeaderText); ICellStyle headStyle = workbook.CreateCellStyle(); headStyle.Alignment = HorizontalAlignment.CENTER; IFont font = workbook.CreateFont(); font.FontHeightInPoints = 20; font.Boldweight = 700; headStyle.SetFont(font); headerRow.GetCell(0).CellStyle = headStyle; //sheet.AddMergedRegion(new Region(0, 0, 0, dtSource.Columns.Count - 1)); sheet.AddMergedRegion(new NPOI.SS.Util.CellRangeAddress(0, 0, 0, dtSource.Columns.Count - 1)); } #endregion #region 列头及样式 { //HSSFRow headerRow = sheet.CreateRow(1); IRow headerRow = sheet.CreateRow(1); ICellStyle headStyle = workbook.CreateCellStyle(); headStyle.Alignment = HorizontalAlignment.CENTER; IFont font = workbook.CreateFont(); font.FontHeightInPoints = 10; font.Boldweight = 700; headStyle.SetFont(font); for (int i = 0; i < oldColumnNames.Length; i++) { headerRow.CreateCell(i).SetCellValue(newColumnNames[i]); headerRow.GetCell(i).CellStyle = headStyle; //设置列宽 sheet.SetColumnWidth(i, (arrColWidth[i] + 1) * 256); } /* foreach (DataColumn column in dtSource.Columns) { headerRow.CreateCell(column.Ordinal).SetCellValue(column.ColumnName); headerRow.GetCell(column.Ordinal).CellStyle = headStyle; //设置列宽 sheet.SetColumnWidth(column.Ordinal, (arrColWidth[column.Ordinal] + 1) * 256); } * */ } #endregion rowIndex = 2; } #endregion #region 填充内容 IRow dataRow = sheet.CreateRow(rowIndex); //foreach (DataColumn column in dtSource.Columns) for(int i=0;i<oldColumnNames.Length;i++) { ICell newCell = dataRow.CreateCell(i); string drValue = row[oldColumnNames[i]].ToString(); switch (dtSource.Columns[oldColumnNames[i]].DataType.ToString()) { case "System.String"://字符串类型 newCell.SetCellValue(drValue); break; case "System.DateTime"://日期类型 DateTime dateV; DateTime.TryParse(drValue, out dateV); newCell.SetCellValue(dateV); newCell.CellStyle = dateStyle;//格式化显示 break; case "System.Boolean"://布尔型 bool boolV = false; bool.TryParse(drValue, out boolV); newCell.SetCellValue(boolV); break; case "System.Int16"://整型 case "System.Int32": case "System.Int64": case "System.Byte": int intV = 0; int.TryParse(drValue, out intV); newCell.SetCellValue(intV); break; case "System.Decimal"://浮点型 case "System.Double": double doubV = 0; double.TryParse(drValue, out doubV); newCell.SetCellValue(doubV); break; case "System.DBNull"://空值处理 newCell.SetCellValue(""); break; default: newCell.SetCellValue(""); break; } } #endregion rowIndex++; } using (MemoryStream ms = new MemoryStream()) { workbook.Write(ms); ms.Flush(); ms.Position = 0; //sheet.Dispose(); sheet = null; workbook = null; //workbook.Dispose();//一般只用写这一个就OK了，他会遍历并释放所有资源，但当前版本有问题所以只释放sheet return ms; } } /// <summary> /// WEB导出DataTable到Excel /// </summary> /// <param name="dtSource">源DataTable</param> /// <param name="strHeaderText">表头文本</param> /// <param name="strFileName">文件名</param> /// <Author>柳永法 http://www.yongfa365.com/ 2010-5-8 22:21:41</Author> public static void ExportByWeb(DataTable dtSource, string strHeaderText, string strFileName) { ExportByWeb(dtSource, strHeaderText, strFileName, "sheet"); } /// <summary> /// WEB导出DataTable到Excel /// </summary> /// <param name="dtSource">源DataTable</param> /// <param name="strHeaderText">表头文本</param> /// <param name="strFileName">输出文件名，包含扩展名</param> /// <param name="oldColumnNames">要导出的DataTable列数组</param> /// <param name="newColumnNames">导出后的对应列名</param> public static void ExportByWeb(DataTable dtSource, string strHeaderText, string strFileName, string[] oldColumnNames, string[] newColumnNames) { ExportByWeb(dtSource, strHeaderText, strFileName, "sheet",oldColumnNames,newColumnNames); } /// <summary> /// WEB导出DataTable到Excel /// </summary> /// <param name="dtSource">源DataTable</param> /// <param name="strHeaderText">表头文本</param> /// <param name="strFileName">输出文件名</param> /// <param name="strSheetName">工作表名称</param> public static void ExportByWeb(DataTable dtSource, string strHeaderText, string strFileName, string strSheetName) { HttpContext curContext = HttpContext.Current; // 设置编码和附件格式 curContext.Response.ContentType = "application/vnd.ms-excel"; curContext.Response.ContentEncoding = Encoding.UTF8; curContext.Response.Charset = ""; curContext.Response.AppendHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode(strFileName, Encoding.UTF8)); //生成列 string columns = ""; for (int i = 0; i < dtSource.Columns.Count; i++) { if (i > 0) { columns += ","; } columns += dtSource.Columns[i].ColumnName; } curContext.Response.BinaryWrite(Export(dtSource, strHeaderText,strSheetName,columns.Split(','),columns.Split(',')).GetBuffer()); curContext.Response.End(); } /// <summary> /// 导出DataTable到Excel /// </summary> /// <param name="dtSource">要导出的DataTable</param> /// <param name="strHeaderText">标题文字</param> /// <param name="strFileName">文件名，包含扩展名</param> /// <param name="strSheetName">工作表名</param> /// <param name="oldColumnNames">要导出的DataTable列数组</param> /// <param name="newColumnNames">导出后的对应列名</param> public static void ExportByWeb(DataTable dtSource, string strHeaderText, string strFileName, string strSheetName, string[] oldColumnNames, string[] newColumnNames) { HttpContext curContext = HttpContext.Current; // 设置编码和附件格式 curContext.Response.ContentType = "application/vnd.ms-excel"; curContext.Response.ContentEncoding = Encoding.UTF8; curContext.Response.Charset = ""; curContext.Response.AppendHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode(strFileName, Encoding.UTF8)); curContext.Response.BinaryWrite(Export(dtSource, strHeaderText, strSheetName,oldColumnNames,newColumnNames).GetBuffer()); curContext.Response.End(); } /// <summary>读取excel /// 默认第一行为表头，导入第一个工作表 /// </summary> /// <param name="strFileName">excel文档路径</param> /// <returns></returns> public static DataTable Import(string strFileName) { DataTable dt = new DataTable(); HSSFWorkbook hssfworkbook; using (FileStream file = new FileStream(strFileName, FileMode.Open, FileAccess.Read)) { hssfworkbook = new HSSFWorkbook(file); } ISheet sheet = hssfworkbook.GetSheetAt(0); System.Collections.IEnumerator rows = sheet.GetRowEnumerator(); IRow headerRow = sheet.GetRow(0); int cellCount = headerRow.LastCellNum; for (int j = 0; j < cellCount; j++) { ICell cell = headerRow.GetCell(j); dt.Columns.Add(cell.ToString()); } for (int i = (sheet.FirstRowNum + 1); i <= sheet.LastRowNum; i++) { IRow row = sheet.GetRow(i); DataRow dataRow = dt.NewRow(); for (int j = row.FirstCellNum; j < cellCount; j++) { if (row.GetCell(j) != null) dataRow[j] = row.GetCell(j).ToString(); } dt.Rows.Add(dataRow); } return dt; } /// <summary> /// 从Excel中获取数据到DataTable /// </summary> /// <param name="strFileName">Excel文件全路径(服务器路径)</param> /// <param name="SheetName">要获取数据的工作表名称</param> /// <param name="HeaderRowIndex">工作表标题行所在行号(从0开始)</param> /// <returns></returns> public static DataTable RenderDataTableFromExcel(string strFileName, string SheetName, int HeaderRowIndex) { using (FileStream file = new FileStream(strFileName, FileMode.Open, FileAccess.Read)) { IWorkbook workbook = new HSSFWorkbook(file); return RenderDataTableFromExcel(workbook, SheetName, HeaderRowIndex); } } /// <summary> /// 从Excel中获取数据到DataTable /// </summary> /// <param name="strFileName">Excel文件全路径(服务器路径)</param> /// <param name="SheetIndex">要获取数据的工作表序号(从0开始)</param> /// <param name="HeaderRowIndex">工作表标题行所在行号(从0开始)</param> /// <returns></returns> public static DataTable RenderDataTableFromExcel(string strFileName, int SheetIndex, int HeaderRowIndex) { using (FileStream file = new FileStream(strFileName, FileMode.Open, FileAccess.Read)) { IWorkbook workbook = new HSSFWorkbook(file); string SheetName = workbook.GetSheetName(SheetIndex); return RenderDataTableFromExcel(workbook, SheetName, HeaderRowIndex); } } /// <summary> /// 从Excel中获取数据到DataTable /// </summary> /// <param name="ExcelFileStream">Excel文件流</param> /// <param name="SheetName">要获取数据的工作表名称</param> /// <param name="HeaderRowIndex">工作表标题行所在行号(从0开始)</param> /// <returns></returns> public static DataTable RenderDataTableFromExcel(Stream ExcelFileStream, string SheetName, int HeaderRowIndex) { IWorkbook workbook = new HSSFWorkbook(ExcelFileStream); ExcelFileStream.Close(); return RenderDataTableFromExcel(workbook, SheetName, HeaderRowIndex); } /// <summary> /// 从Excel中获取数据到DataTable /// </summary> /// <param name="ExcelFileStream">Excel文件流</param> /// <param name="SheetIndex">要获取数据的工作表序号(从0开始)</param> /// <param name="HeaderRowIndex">工作表标题行所在行号(从0开始)</param> /// <returns></returns> public static DataTable RenderDataTableFromExcel(Stream ExcelFileStream, int SheetIndex, int HeaderRowIndex) { IWorkbook workbook = new HSSFWorkbook(ExcelFileStream); ExcelFileStream.Close(); string SheetName = workbook.GetSheetName(SheetIndex); return RenderDataTableFromExcel(workbook, SheetName, HeaderRowIndex); } /// <summary> /// 从Excel中获取数据到DataTable /// </summary> /// <param name="workbook">要处理的工作薄</param> /// <param name="SheetName">要获取数据的工作表名称</param> /// <param name="HeaderRowIndex">工作表标题行所在行号(从0开始)</param> /// <returns></returns> public static DataTable RenderDataTableFromExcel(IWorkbook workbook, string SheetName, int HeaderRowIndex) { ISheet sheet = workbook.GetSheet(SheetName); DataTable table = new DataTable(); try { IRow headerRow = sheet.GetRow(HeaderRowIndex); int cellCount = headerRow.LastCellNum; for (int i = headerRow.FirstCellNum; i < cellCount; i++) { DataColumn column = new DataColumn(headerRow.GetCell(i).StringCellValue); table.Columns.Add(column); } int rowCount = sheet.LastRowNum; #region 循环各行各列,写入数据到DataTable for (int i = (sheet.FirstRowNum + 1); i < sheet.LastRowNum; i++) { IRow row = sheet.GetRow(i); DataRow dataRow = table.NewRow(); for (int j = row.FirstCellNum; j < cellCount; j++) { ICell cell = row.GetCell(j); if (cell == null) { dataRow[j] = null; } else { //dataRow[j] = cell.ToString(); switch (cell.CellType) { case CellType.BLANK: dataRow[j] = null; break; case CellType.BOOLEAN: dataRow[j] = cell.BooleanCellValue; break; case CellType.NUMERIC: dataRow[j] = cell.ToString(); break; case CellType.STRING: dataRow[j] = cell.StringCellValue; break; case CellType.ERROR: dataRow[j] = cell.ErrorCellValue; break; case CellType.FORMULA: default: dataRow[j] = "=" + cell.CellFormula; break; } } } table.Rows.Add(dataRow); //dataRow[j] = row.GetCell(j).ToString(); } #endregion } catch (System.Exception ex) { table.Clear(); table.Columns.Clear(); table.Columns.Add("出错了"); DataRow dr = table.NewRow(); dr[0] = ex.Message; table.Rows.Add(dr); return table; } finally { //sheet.Dispose(); workbook = null; sheet = null; } #region 清除最后的空行 for (int i = table.Rows.Count - 1; i > 0; i--) { bool isnull = true; for (int j = 0; j < table.Columns.Count; j++) { if (table.Rows[i][j] != null) { if (table.Rows[i][j].ToString() != "") { isnull = false; break; } } } if (isnull) { table.Rows[i].Delete(); } } #endregion return table; }}
