• NPOI 导入,导出EXCEL


    代码:

     public static class NPOIExcelHelper
        {
            /// <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://www.rongzi.com/";
                    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 = "东方融资网";            //填加xls文件创建程序信息   
                    si.LastAuthor = "融管系统";           //填加xls文件最后保存者信息   
                    si.Comments = "融管系统自建文件";      //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;
            }
        }

    2代:

    using System;
    using System.Collections.Generic;
    using System.Data;
    using System.IO;
    using System.Text;
    using System.Web;
    using NPOI.HPSF;
    using NPOI.HSSF.UserModel;
    using NPOI.SS.UserModel;
    using NPOI.HSSF.Util;
    using NPOI.XSSF.UserModel;
    
    namespace DFSSRZ.Utility
    {
        public static class NPOIExcelHelper
        {
            /// <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>   
            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>
            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://www.rongzi.com/";
                    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 = "东方融资网";            //填加xls文件创建程序信息   
                    si.LastAuthor = "融管系统";           //填加xls文件最后保存者信息   
                    si.Comments = "融管系统自建文件";      //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;
                }
    
                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;
                        }
                    }
                }
                #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);
                            }
                        }
                        #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>   
            /// 导入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;
            }
    
            public static DataTable ExcelToDataTable(string fileName,Stream stream, bool isFirstRowColumn=true)
            {
                IWorkbook workbook = null;
                ISheet sheet = null;
                DataTable data = new DataTable();
                int startRow = 0;
                try
                {
                    if (fileName.IndexOf(".xlsx") > 0) // 2007版本
                        workbook = new XSSFWorkbook(stream);
                    else if (fileName.IndexOf(".xls") > 0) // 2003版本
                        workbook = new HSSFWorkbook(stream);
                    
                    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)
                {
                    throw ex;
                }
                finally
                {
                    if (stream != null)
                    {
                        stream.Close();
                    }
                }
            }
    
            /// <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
                            {
                                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);
                    }
                    #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;
            }
        }
    }
    View Code

    兼容03,07版本。

     public static DataTable RenderDataTableFromExcel(string strFileName, string SheetName, int HeaderRowIndex)
            {
                using (FileStream file = new FileStream(strFileName, FileMode.Open, FileAccess.Read))
                {
                    IWorkbook workbook;
                    //IWorkbook workbook = new HSSFWorkbook(file);
                    try
                    {
                        workbook = new XSSFWorkbook(file);
                    }
                    catch (Exception ex)
                    {
                        workbook = new HSSFWorkbook(file);
                    }
                    return RenderDataTableFromExcel(workbook, SheetName, HeaderRowIndex);
                }
            }

    http://www.blogjava.net/spinage/archive/2011/03/16/346409.html

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  • 原文地址:https://www.cnblogs.com/hongdada/p/6086015.html
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