NPIO导入导出excel文件

最近在一个项目上帮忙 ，做了一个将excel文件数据导入到数据库的功能

用到的辅助类：

public class ExcelHelper : IDisposable
    {
        private string fileName = null; //文件名  
        private IWorkbook workbook = null;
        private FileStream fs = null;
        private bool disposed;
        public ExcelHelper(string fileName)//构造函数，读入文件名  
        {
            this.fileName = fileName;
            disposed = false;
        }
        /// 将excel中的数据导入到DataTable中  
        /// <param name="sheetName">excel工作薄sheet的名称</param>  
        /// <param name="isFirstRowColumn">第一行是否是DataTable的列名</param>  
        /// <returns>返回的DataTable</returns>  
        public DataTable ExcelToDataTable(string sheetName, bool isFirstRowColumn)
        {
            ISheet sheet = null;
            DataTable dataTable = new DataTable(sheetName);
            int startRow = 0;
            try
            {
                fs = new FileStream(fileName, FileMode.Open, FileAccess.Read);
                workbook = WorkbookFactory.Create(fs);
                if (sheetName != null)
                {
                    sheet = workbook.GetSheet(sheetName);
                    //如果没有找到指定的sheetName对应的sheet，则尝试获取第一个sheet  
                    if (sheet == null)
                    {
                        sheet = workbook.GetSheetAt(0);
                    }
                }
                else
                {
                    sheet = workbook.GetSheetAt(0);
                }
                if (sheet != null)
                {
                    IRow firstRow = sheet.GetRow(0);
                    int cellCount = firstRow.LastCellNum; //一行最后一个cell的编号，即总的列数  
                    if (isFirstRowColumn)
                    {
                        for (int i = firstRow.FirstCellNum; i < cellCount; ++i)
                        {
                            ICell cell = firstRow.GetCell(i);
                            if (cell != null)
                            {
                                string cellValue = cell.StringCellValue;
                                if (cellValue != null)
                                {
                                    DataColumn column = new DataColumn(cellValue);
                                    dataTable.Columns.Add(column);
                                }
                            }
                        }
                        startRow = sheet.FirstRowNum + 1;//得到项标题后  
                    }
                    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 = dataTable.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  
                            {
                                ICell cell = row.GetCell(j);
                                //Cell为非NUMERIC时，调用IsCellDateFormatted方法会报错，所以先要进行类型判断
                                if (cell.CellType == CellType.Numeric && DateUtil.IsCellDateFormatted(cell))
                                    dataRow[j] = cell.DateCellValue.ToString("yyyy-MM-dd");
                                else
                                {
                                    dataRow[j] = row.GetCell(j).ToString();
                                }
                            }
                        }
                        dataTable.Rows.Add(dataRow);
                    }
                }
                //去除datatable空白行
                List<DataRow> removelist = new List<DataRow>();
                for (int i = 0; i < dataTable.Rows.Count; i++)
                {
                    bool IsNull = true;
                    for (int j = 0; j < dataTable.Columns.Count; j++)
                    {
                        if (!string.IsNullOrEmpty(dataTable.Rows[i][j].ToString().Trim()))
                        {
                            IsNull = false;
                        }
                    }
                    if (IsNull)
                    {
                        removelist.Add(dataTable.Rows[i]);
                    }
                }
                for (int i = 0; i < removelist.Count; i++)
                {
                    dataTable.Rows.Remove(removelist[i]);
                }
                return dataTable;
            }
            catch (Exception ex)//打印错误信息  
            {
                MessageBox.Show("Exception: " + ex.Message);
                return null;
            }
        }
        
        //将DataTable数据导入到excel中  
        //<param name="data">要导入的数据</param>  
        //<param name="sheetName">要导入的excel的sheet的名称</param>  
        //<param name="isColumnWritten">DataTable的列名是否要导入</param>  
        //<returns>导入数据行数(包含列名那一行)</returns>  
        public int DataTableToExcel(DataTable data, string sheetName, bool isColumnWritten)
        {
            int i = 0;
            int j = 0;
            int count = 0;
            ISheet sheet = null;

            fs = new FileStream(fileName, FileMode.OpenOrCreate, FileAccess.ReadWrite);
            if (fileName.IndexOf(".xlsx") > 0) // 2007版本  
                workbook = new XSSFWorkbook();
            else if (fileName.IndexOf(".xls") > 0) // 2003版本  
                workbook = new HSSFWorkbook();

            try
            {
                if (workbook != null)
                {
                    sheet = workbook.CreateSheet(sheetName);
                }
                else
                {
                    return -1;
                }

                if (isColumnWritten == true) //写入DataTable的列名  
                {
                    IRow row = sheet.CreateRow(0);
                    for (j = 0; j < data.Columns.Count; ++j)
                    {
                        row.CreateCell(j).SetCellValue(data.Columns[j].ColumnName);
                    }
                    count = 1;
                }
                else
                {
                    count = 0;
                }

                for (i = 0; i < data.Rows.Count; ++i)
                {
                    IRow row = sheet.CreateRow(count);
                    for (j = 0; j < data.Columns.Count; ++j)
                    {
                        row.CreateCell(j).SetCellValue(data.Rows[i][j].ToString());
                    }
                    ++count;
                }
                workbook.Write(fs); //写入到excel  
                return count;
            }
            catch (Exception ex)
            {
                Console.WriteLine("Exception: " + ex.Message);
                return -1;
            }
        }

        public void Dispose()//IDisposable为垃圾回收相关的东西，用来显式释放非托管资源,这部分目前还不是非常了解  
        {
            Dispose(true);
            GC.SuppressFinalize(this);
        }
        protected virtual void Dispose(bool disposing)
        {
            if (!this.disposed)
            {
                if (disposing)
                {
                    if (fs != null)
                        fs.Close();
                }
                fs = null;
                disposed = true;
            }
        }
    }