NPOI导出Excel（多表头，多工作薄）代码,Asp.NET代码库,德仔网

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【Asp.NET】 NPOI导出Excel（多表头，多工作薄）
作者:智睿 / 发布于2016/9/13/ 515
public class NPOIHelper  
    {  
        #region 实例化  
        /// <summary>  
        /// 文件名称  
        /// </summary>  
        public string _fileName { get; private set; }  
        /// <summary>  
        /// 工作薄名称，多工作薄以";"隔开，例如：测试1;测试2;测试3  
        /// </summary>  
        public string _sheetName { get; private set; }  
        /// <summary>  
        /// 每个工作薄只能有一个标题，多工作薄时，标题以";"隔开  
        /// </summary>  
        public string _title { get; private set; }  
        /// <summary>  
        /// 表头格式  
        /// 相邻父列头之间用'#'分隔,父列头与子列头用空格(' ')分隔,相邻子列头用逗号分隔(',')  
        /// 两行：序号#分公司#组别#本日成功签约单数 预警,续约,流失,合计#累计成功签约单数 预警,续约,流失,合计#任务数#完成比例#排名   
        /// 三行：等级#级别#上期结存 件数,重量,比例#本期调入 收购调入 件数,重量,比例#本期发出 车间投料 件数,重量,比例#本期发出 产品外销百分比 件数,重量,比例#平均值   
        /// 三行时请注意：列头要重复    
        /// </summary>  
        public string _header { get; private set; }  
        /// <summary>  
        /// 文件路径 如果WEB导出时，路径可为空；  
        /// </summary>  
        public string _filePath { get; private set; }  
        /// <summary>  
        /// 导出方式 1：WEB导出 2：路径导出  
        /// </summary>  
        public int _exportMode { get; private set; }   
        /// <summary>  
        /// 数据源  
        /// </summary>  
        public DataSet _dsSource { get; private set; }  
        /// <summary>  
        /// 数据库采用字段  
        /// </summary>  
        public string _filed { get; private set; }  
        /// <summary>  
        /// HSSFWorkbook 对象  
        /// </summary>  
        private HSSFWorkbook _workbook;  
        /// <summary>  
        /// 实例化  
        /// </summary>  
        /// <param name="fileName">文件名称</param>  
        /// <param name="sheetName">工作薄名称，多工作薄以";"隔开，例如：测试1;测试2;测试3</param>  
        /// <param name="header">  
        /// 相邻父列头之间用'#'分隔,父列头与子列头用空格(' ')分隔,相邻子列头用逗号分隔(',')  
        /// 两行：序号#分公司#组别#本日成功签约单数 预警,续约,流失,合计#累计成功签约单数 预警,续约,流失,合计#任务数#完成比例#排名   
        /// 三行：等级#级别#上期结存 件数,重量,比例#本期调入 收购调入 件数,重量,比例#本期发出 车间投料 件数,重量,比例#本期发出 产品外销百分比 件数,重量,比例#平均值   
        /// 三行时请注意：列头要重复  
        /// </param>  
        /// <param name="ds">数据来源</param>  
        /// <param name="filed">数据字段</param>  
        public NPOIHelper(string fileName, string sheetName, string header,DataSet ds,string filed)  
        {  
            // 判断文件后缀名是否存在  
            if (string.IsNullOrEmpty(fileName))  
                fileName = "新建Excel.xls";  
            else if (fileName.IndexOf(".xls") == -1 && fileName.IndexOf(".xlsx") == -1)  
                fileName += ".xls";  
  
            this._workbook = new HSSFWorkbook();  
            this._fileName = fileName;  
            this._header = header;  
            if (string.IsNullOrEmpty(sheetName))  
                throw new ArgumentNullException("sheetName", "工作薄名称不能为空");  
            this._sheetName = sheetName;  
            this._exportMode = 1;  
            this._dsSource = ds;  
            this._filed = filed;  
        }  
        /// <summary>  
        ///   
        /// </summary>  
        /// <param name="fileName">文件名称</param>  
        /// <param name="sheetName">工作薄名称，多工作薄以";"隔开，例如：测试1;测试2;测试3</param>  
        /// <param name="header">  
        /// 相邻父列头之间用'#'分隔,父列头与子列头用空格(' ')分隔,相邻子列头用逗号分隔(',')  
        /// 两行：序号#分公司#组别#本日成功签约单数 预警,续约,流失,合计#累计成功签约单数 预警,续约,流失,合计#任务数#完成比例#排名   
        /// 三行：等级#级别#上期结存 件数,重量,比例#本期调入 收购调入 件数,重量,比例#本期发出 车间投料 件数,重量,比例#本期发出 产品外销百分比 件数,重量,比例#平均值   
        /// 三行时请注意：列头要重复  
        /// </param>  
        /// <param name="title">每个工作薄只能有一个标题，多工作薄时，标题以";"隔开</param>  
        /// <param name="filePath">文件路径</param>  
        /// <param name="exportMode">导出方式 1：WEB导出 2：路径导出</param>  
        /// <param name="ds">数据来源</param>  
        /// <param name="filed">数据字段</param>  
        public NPOIHelper(string fileName, string sheetName, string header, string title, DataSet ds, string filed,string filePath = null, int exportMode = 1)  
        {  
            // 判断文件后缀名是否存在  
            if (string.IsNullOrEmpty(fileName))  
                fileName = "新建Excel.xls";  
            else if (fileName.IndexOf(".xls") == -1 && fileName.IndexOf(".xlsx") == -1)  
                fileName += ".xls";  
  
            this._workbook = new HSSFWorkbook();  
            this._fileName = fileName;  
  
            if (string.IsNullOrEmpty(sheetName))  
                throw new ArgumentNullException("sheetName", "工作薄名称不能为空");  
            this._sheetName = sheetName;  
            this._header = header;  
            this._title = title;  
  
            if (2 == exportMode && string.IsNullOrEmpty(filePath))  
                filePath = Environment.GetFolderPath(Environment.SpecialFolder.Desktop);  
  
            this._filePath = filePath;  
            this._exportMode = exportMode;  
            this._dsSource = ds;  
            this._filed = filed;  
        }  
        #endregion  
 
        #region 功能实现  
        /// <summary>  
        /// 实现导出功能  
        /// </summary>  
        public void Export()  
        {  
            #region 变量声明  
            string[] tableTitle = this._header.Split(new char[] { ';' }, StringSplitOptions.RemoveEmptyEntries);  
            // 表头数组  
            string[] newHeaders = null;  
            // 数据字段  
            string[] files = this._filed.Split(new char[] { ';' }, StringSplitOptions.RemoveEmptyEntries);  
            // 数据字段  
            string[] file = null;  
            // 临时数组  
            string[] temp = null;  
            // 临时表头  
            string tempHeader = string.Empty;  
            // 工作薄名称  
            string[] sheetNames = this._sheetName.Split(new string[] { ";" }, StringSplitOptions.RemoveEmptyEntries);  
            // 表头名称  
            string[] titles = this._title == null ? null : this._title.Split(new string[] { ";" }, StringSplitOptions.RemoveEmptyEntries);  
            // 获取行数  
            int rows = GetRowCount(this._header);  
            // 列数计数器  
            int cols = 0;  
            // 列头跨行数  
            int rowSpans = 0;  
            // 列头跨列数  
            int colSpans = GetColCount(this._header);  
            // HSSFSheet 对象  
            HSSFSheet sheet = null;  
            // IRow 对象  
            IRow row = null;  
            // 表头行添加  
            int trow = (string.IsNullOrEmpty(this._title) ? 0 : 1);  
            DataTable dt;  
            #endregion  
 
            #region 单元格样式  
            ICellStyle style = _workbook.CreateCellStyle();  
            style.Alignment = HorizontalAlignment.CENTER; //居中  
            style.VerticalAlignment = VerticalAlignment.CENTER;//垂直居中   
            style.WrapText = true;//自动换行  
            // 边框  
            style.BorderBottom = BorderStyle.THIN;  
            style.BorderLeft = BorderStyle.THIN;  
            style.BorderRight = BorderStyle.THIN;  
            style.BorderTop = BorderStyle.THIN;  
            // 字体  
            IFont font = _workbook.CreateFont();  
            font.FontHeightInPoints = 10;  
            font.FontName = "宋体";  
            style.SetFont(font);  
  
            ICellStyle titleType = _workbook.CreateCellStyle();  
            titleType.Alignment = HorizontalAlignment.CENTER; //居中  
            titleType.VerticalAlignment = VerticalAlignment.CENTER;//垂直居中   
            titleType.WrapText = true;//自动换行  
            // 边框  
            titleType.BorderBottom = BorderStyle.THIN;  
            titleType.BorderLeft = BorderStyle.THIN;  
            titleType.BorderRight = BorderStyle.THIN;  
            titleType.BorderTop = BorderStyle.THIN;  
  
            IFont font2 = _workbook.CreateFont();  
            font2.FontHeightInPoints = 14;  
            font2.FontName = "宋体";  
            font2.Boldweight = (short)FontBoldWeight.BOLD;  
            titleType.SetFont(font2);  
            #endregion  
  
            // 表格绘制  
            for (int k = 0; k < sheetNames.Length; k++)  
            {  
                #region 表头绘制  
                newHeaders = tableTitle[k].Split(new char[] { '#' }, StringSplitOptions.RemoveEmptyEntries);  
                sheet = (HSSFSheet)_workbook.CreateSheet(sheetNames[k]);  
                for (int m = 0; m < rows + trow; m++) // 创建行  
                {  
                    if (m == 0 && trow > 0)  
                    {  
                        row = sheet.CreateRow(0);  
                        CellRangeAddress region = new CellRangeAddress(0, 0, 0, colSpans - 1);  
                        sheet.AddMergedRegion(region);  
                        row.CreateCell(0).SetCellValue(titles[k]);  
                        row.GetCell(0).CellStyle = titleType;  
                        row.Height = 20 * 20;  
                        continue;  
                    }  
                    cols = 0;  
                    for (int i = 0; i < newHeaders.Length; i++) // 创建列  
                    {  
  
                        tempHeader = newHeaders[i];  
                        // 获取列头跨行数  
                        rowSpans = GetRowSpan(tempHeader, rows);  
                        // 获取列头跨列数  
                        colSpans = GetColSpan(tempHeader);  
  
                        // 如果表头还可以划分  
                        temp = tempHeader.Split(new char[] { ' ' });  
                        if (temp.Length == rows)  
                            tempHeader = temp[m - trow];  
                        else  
                            tempHeader = temp[0];  
  
  
  
                        if (1 == rowSpans)  
                        {  
                            // 获取行  
                            row = sheet.GetRow(m);  
                            if (row == null)  
                                row = sheet.CreateRow(m);  
  
                            // 未跨列  
                            if (1 == colSpans)  
                            {  
                                row.CreateCell(cols).SetCellValue(tempHeader);  
                                row.GetCell(cols).CellStyle = style;  
                            }  
                            else // 跨列  
                            {  
                                temp = tempHeader.Split(new char[] { ',' });  
                                if (temp.Length > 1)  
                                {  
                                    for (int j = 0; j < temp.Length; j++)  
                                    {  
                                        row.CreateCell(j + cols).SetCellValue(temp[j]);  
                                        row.GetCell(j + cols).CellStyle = style;  
                                    }  
                                }  
                                else  
                                {  
                                    // 创建范围  
                                    //CellRangeAddress四个参数为：起始行，结束行，起始列，结束列  
                                    CellRangeAddress region = new CellRangeAddress(m, m, cols, cols + colSpans - 1);  
                                    sheet.AddMergedRegion(region);  
                                    row.CreateCell(cols).SetCellValue(tempHeader);  
                                    row.GetCell(cols).CellStyle = style;  
                                }  
                                cols += colSpans - 1;  
                            }  
                        }  
                        else if (rowSpans > 1 && m < 2)  
                        {  
                            // 获取行  
                            row = sheet.GetRow(m);  
                            if (row == null)  
                                row = sheet.CreateRow(m);  
  
                            // 未跨列  
                            if (1 == colSpans)  
                            {  
                                // 创建范围  
                                //CellRangeAddress四个参数为：起始行，结束行，起始列，结束列  
                                CellRangeAddress region = new CellRangeAddress(m, rowSpans - 1 + trow, cols, cols);  
                                sheet.AddMergedRegion(region);  
                                row.CreateCell(cols).SetCellValue(tempHeader);  
                                row.GetCell(cols).CellStyle = style;  
                            }  
                            else  
                            {  
                                // 创建范围  
                                //CellRangeAddress四个参数为：起始行，结束行，起始列，结束列  
                                CellRangeAddress region = new CellRangeAddress(m, rowSpans - 1 + trow, cols, cols + colSpans - 1);  
                                sheet.AddMergedRegion(region);  
                                row.CreateCell(cols).SetCellValue(tempHeader);  
                                row.GetCell(cols).CellStyle = style;  
                                cols += colSpans - 1;  
                            }  
                        }  
                        // 列计数器  
                        cols += 1;  
                    }  
                }  
                #endregion  
 
                #region 数据源  
                int rowIndex = rows + trow;  
                foreach (DataRow dr in this._dsSource.Tables[k].Rows)  
                {  
  
                    var dataRow = sheet.CreateRow(rowIndex);  
                    foreach (DataColumn column in this._dsSource.Tables[k].Columns)  
                    {  
                        var newCell = dataRow.CreateCell(column.Ordinal);  
  
                        string drValue = dr[column].ToString();  
  
                        switch (column.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;  
                        }  
  
                    }  
                    rowIndex++;  
                }  
                #endregion  
            }  
              
            #region 数据导出  
            // WEB导出  
            if (1 == this._exportMode)  
            {  
                System.Web.HttpContext.Current.Response.ContentType = "application/vnd.ms-excel";  
                //设置下载的Excel文件名  
                System.Web.HttpContext.Current.Response.AddHeader("Content-Disposition", string.Format("attachment;filename={0}", this._fileName));  
  
                using (MemoryStream ms = new MemoryStream())  
                {  
                    //将工作簿的内容放到内存流中  
                    _workbook.Write(ms);  
                    //将内存流转换成字节数组发送到客户端  
                    System.Web.HttpContext.Current.Response.BinaryWrite(ms.GetBuffer());  
                    System.Web.HttpContext.Current.Response.End();  
                    _workbook = null;  
                }  
            }  
            else if (2 == this._exportMode)  
            {  
                using (FileStream fs = File.Open(this._filePath, FileMode.Append))  
                {  
                    _workbook.Write(fs);  
                    _workbook = null;  
                }  
            }  
            #endregion  
        }  
        #endregion  
 
        #region 辅助方法  
        /// <summary>  
        /// 获取表头行数  
        /// </summary>  
        /// <param name="newHeaders">表头文字</param>  
        /// <returns></returns>  
        private int GetRowCount(string newHeaders)  
        {  
            // 用@分割  
            string[] ColumnNames = newHeaders.Split(new char[] { '@' });  
            int Count = 0;  
            if (ColumnNames.Length <= 1)  
                ColumnNames = newHeaders.Split(new char[] { '#' });  
            foreach (string name in ColumnNames)  
            {  
                int TempCount = name.Split(new char[] { ' ' }).Length;  
                if (TempCount > Count)  
                    Count = TempCount;  
            }  
            return Count;  
        }  
  
        /// <summary>  
        /// 获取表头列数  
        /// </summary>  
        /// <param name="newHeaders">表头文字</param>  
        /// <returns></returns>  
        private int GetColCount(string newHeaders)  
        {  
            // 用@分割  
            string[] ColumnNames = newHeaders.Split(new char[] { '@' });  
            int Count = 0;  
            if (ColumnNames.Length <= 1)  
                ColumnNames = newHeaders.Split(new char[] { '#' });  
            Count = ColumnNames.Length;  
            foreach (string name in ColumnNames)  
            {  
                int TempCount = name.Split(new char[] { ',' }).Length;  
                if (TempCount > 1)  
                    Count += TempCount - 1;  
            }  
            return Count;  
        }  
  
        /// <summary>  
        /// 列头跨列数  
        /// </summary>  
        /// <remarks>  
        /// author:zhujt  
        /// create date:2015-9-9 09:17:34  
        /// </remarks>  
        /// <param name="newHeaders">表头文字</param>  
        /// <returns></returns>  
        private int GetColSpan(string newHeaders)  
        {  
            return newHeaders.Split(',').Count();  
        }  
  
        /// <summary>  
        /// 列头跨行数  
        /// </summary>   
        /// <remarks>  
        /// author:zhujt  
        /// create date:2015-9-9 09:17:14  
        /// </remarks>  
        /// <param name="newHeaders">列头文本</param>  
        /// <param name="rows">表头总行数</param>  
        /// <returns></returns>  
        private int GetRowSpan(string newHeaders, int rows)  
        {  
            int Count = newHeaders.Split(new string[] { " " }, StringSplitOptions.RemoveEmptyEntries).Length;  
            // 如果总行数与当前表头所拥有行数相等  
            if (rows == Count)  
                Count = 1;  
            else if (Count < rows)  
                Count = 1 + (rows - Count);  
            else  
                throw new Exception("表头格式不正确！");  
            return Count;  
        }  
        #endregion  
    }
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