NPOI的使用Excel模板导出

Excel模版建议把需要添加数据行的样式设置好

模版样式，导出后效果

【2017-11-22　　对获取需插入数据的首行样式有时为空报错修改】

        /// <summary>
        /// 根据模版导出Excel
        /// </summary>
        /// <param name="templateFile">模版路径（包含后缀）  例："~/Template/Exceltest.xls"</param>
        /// <param name="strFileName">文件名称（不包含后缀）  例："Excel测试"</param>
        /// <param name="source">源DataTable</param>
        /// <param name="cellKes">需要导出的对应的列字段  例：string[] cellKes = { "Date","Remarks" };</param>
        /// <param name="rowIndex">从第几行开始创建数据行,第一行为0</param>
        /// <returns>是否导出成功</returns>
        public static string ExportScMeeting(string templateFile, string strFileName, DataTable source, string[] cellKes, int rowIndex)
        {
            templateFile = HttpContext.Current.Server.MapPath(templateFile);
            int cellCount = cellKes.Length;//总列数，第一列为0
            IWorkbook workbook = null;
            try
            {
                using (FileStream file = new FileStream(templateFile, FileMode.Open, FileAccess.Read))
                {
                    if (Path.GetExtension(templateFile) == ".xls")
                        workbook = new HSSFWorkbook(file);
                    else if (Path.GetExtension(templateFile) == ".xlsx")
                        workbook = new XSSFWorkbook(file);
                }
                ISheet sheet = workbook.GetSheetAt();
                if (sheet != null && source != null && source.Rows.Count > )
                {
                    IRow row; ICell cell;
                    //获取需插入数据的首行样式
                    IRow styleRow = sheet.GetRow(rowIndex);
                    if (styleRow == null)
                    {
                        for (int i = , len = source.Rows.Count; i < len; i++)
                        {
                            row = sheet.CreateRow(rowIndex);
                            //创建列并插入数据
                            for (int index = ; index < cellCount; index++)
                            {
                                row.CreateCell(index)
                                    .SetCellValue(!(source.Rows[i][cellKes[index]] is DBNull) ? source.Rows[i][cellKes[index]].ToString() : string.Empty);
                            }
                            rowIndex++;
                        }
                    }
                    else
                    {
                        for (int i = , len = source.Rows.Count; i < len; i++)
                        {
                            row = sheet.CreateRow(rowIndex);
                            row.HeightInPoints = styleRow.HeightInPoints;
                            row.Height = styleRow.Height;
                            //创建列并插入数据
                            for (int index = ; index < cellCount; index++)
                            {
                                cell = row.CreateCell(index, styleRow.GetCell(index).CellType);
                                cell.CellStyle = styleRow.GetCell(index).CellStyle;
                                cell.SetCellValue(!(source.Rows[i][cellKes[index]] is DBNull) ? source.Rows[i][cellKes[index]].ToString() : string.Empty);
                            }
                            rowIndex++;
                        }
                    }
                }
                return NPOIExport(strFileName + "." + templateFile.Split('.')[templateFile.Split('.').Length - ], workbook);
            }
            catch (Exception ex)
            {
                return ex.Message;
            }

        }

附属方法

        public static string NPOIExport(string fileName, IWorkbook workbook)
        {
            try
            {
                System.IO.MemoryStream ms = new System.IO.MemoryStream();
                workbook.Write(ms);

                HttpContext.Current.Response.Clear();
                HttpContext.Current.Response.ClearHeaders();
                HttpContext.Current.Response.Cache.SetCacheability(System.Web.HttpCacheability.Private);
                HttpContext.Current.Response.Buffer = true;
                HttpContext.Current.Response.ContentEncoding = System.Text.Encoding.UTF8;
                HttpContext.Current.Response.AddHeader("Content-Disposition", string.Format("attachment; filename={0}", fileName));
                HttpContext.Current.Response.ContentType = "application/ms-excel";
                HttpContext.Current.Response.BinaryWrite(ms.ToArray());
                HttpContext.Current.Response.Flush();
                HttpContext.Current.Response.End();
                ms.Close();
                ms.Dispose();
                return "导出成功";
            }
            catch (Exception ex)
            {
                return "导出失败";
            }
        }

调用方法

    /// <summary>
    /// 后台调用方法
    /// </summary>
    /// <returns></returns>
    public string Exc()
    {
        return ExcelUtil.ExportScMeeting("~/Template/MonthlyRepair.xls", "ExcelName", new DataTable(), new string[] { "name1", "name2" }, );
    }

    //前台js调用 window.open('@Url.Action("Exc")');

注：需要在指定行插入数据的话请使用NPOI自带的方法对Excel进行操作

sheet.ShiftRows(0/*开始行*/, sheet.LastRowNum/*结束行*/, 10/*插入总行数，移动大小(行数)--往下移动*/, true/*是否复制行高*/, false/*是否重置行高*/);

示例方法代码

    /// <summary>
    /// 根据模版导出Excel
    /// </summary>
    /// <param name="templateFile">模版路径（包含后缀）  例："~/Template/Exceltest.xls"</param>
    /// <param name="strFileName">文件名称（不包含后缀）  例："Excel测试"</param>
    /// <param name="isCover">是否向下覆盖，不覆盖则在rowIndex行插入数据</param>
    /// <param name="source">源DataTable</param>
    /// <param name="cellKes">需要导出的对应的列字段  例：string[] cellKes = { "Date","Remarks" };</param>
    /// <param name="rowIndex">从第几行开始创建数据行,第一行为0</param>
    /// <returns>是否导出成功</returns>
    public static string ExportScMeeting(string templateFile, string strFileName, bool isCover, DataTable source, string[] cellKes, int rowIndex)
    {
        templateFile = HttpContext.Current.Server.MapPath(templateFile);
        int cellCount = cellKes.Length;//总列数，第一列为0
        IWorkbook workbook = null;
        try
        {
            using (FileStream file = new FileStream(templateFile, FileMode.Open, FileAccess.Read))
            {
                workbook = new HSSFWorkbook(file);
            }
            ISheet sheet = workbook.GetSheetAt();
            if (sheet != null && source != null && source.Rows.Count > )
            {
                IRow row;
                //是否向下覆盖
                if (!isCover) sheet.ShiftRows(rowIndex, sheet.LastRowNum, source.Rows.Count, true, false);
                //获取需插入数据的首行样式
                IRow styleRow = sheet.GetRow(isCover ? rowIndex : (rowIndex + source.Rows.Count));
                for (int i = , len = source.Rows.Count; i < len; i++)
                {
                    row = sheet.CreateRow(rowIndex);
                    //创建列并插入数据
                    for (int index = ; index < cellCount; index++)
                    {
                        row.CreateCell(index)
                            .SetCellValue(!(source.Rows[i][cellKes[index]] is DBNull) ? source.Rows[i][cellKes[index]].ToString() : string.Empty);
                    }
                    rowIndex++;
                }
            }
            return NPOIExport(strFileName + ".xls", workbook);
        }
        catch (Exception ex)
        {
            return ex.Message;
        }
    }