【2010-12-16】基於NPOI的打開/導出Excel文件操作類

 

在很久之前我應該是寫過一次關於Excel的導入導出的文章的，那時候是直接使用OFFICE的組件，後來遇到進程的問題，改爲使用第三方Aspose.Cells，但這是一個收費的組件，最近在開源中國中看到開源項目NPOI，所以今天把Aspose.Cells替換掉，改成NPOI。

NPOI目前應該說沒有Aspose.Cells強大的，比如說現在日漸盛行的OFFICE 2007，NPOI還不支持，有些操作也不如Aspose.Cells來的方便。但是我曾經把兩者比較過，打開Excel文件的話，Aspose.Cells會快大概1-3秒左右，導出的話NPOI反而比Aspose.Cells快上05-2秒左右（導出的過程邏輯是一樣的，我只是把用到Aspose.Cells的地方都換成NPOI的操作），當然這裏的比較僅僅是提供參考。

Aspose.Cells，我感覺其實就是封裝了好些常用的操作，比如說打開文件並導入一個DataTable裏，在Aspose.Cells是已經封裝好的方法，而在NPOI是需要自己做的。兩者應該是各有各的優勢的，但是畢竟Aspose.Cells是收費的，估計願意出錢的不多，而且要用全部功能的也不多，而NPOI免費而且開源，況且我僅僅是做一些簡單的導入導出而已。

因爲是類庫，沒什麼圖片上，上代碼：

 

/// <summary> /// 打開指定EXCEL文件並導入到指定的DataTable中。DataTable必須先建立相應數據列。 /// </summary> /// <param name="FilePath">文件路徑</param> /// <param name="SheetName">工作表名稱</param> /// <param name="FirstRow">第一行</param> /// <param name="FirstCol">第一列</param> /// <param name="InDataTable">指定的DataTable</param> public static Boolean OpenExcelFile(String FilePath, String SheetName, Int32 FirstRow, Int32 FirstCol , ref DataTable InDataTable) { Boolean iExistsSheet = false; Int32 iSheetIndex=0; errMeg = ""; if (File.Exists(FilePath) == false) { errMeg = "指定的文件不存在!"; return false; } HSSFWorkbook iMyWorkbook = null; using (Stream iExcelFile = File.Open(FilePath, FileMode.Open, FileAccess.Read)) { if (CheckIsExcel03File(iExcelFile) == false) { errMeg = "指定的文件並非Excle2003或其以下版本！"; return false; } iMyWorkbook = new HSSFWorkbook(iExcelFile); } if (iMyWorkbook == null) { errMeg = "打開指定的文件出錯!"; return false; } for (int i = 0; i < iMyWorkbook.NumberOfSheets; i++) { if (iMyWorkbook.GetSheetName(i) == SheetName) { iExistsSheet = true; iSheetIndex=i; break; } } if (iExistsSheet == false) { errMeg = "指定的工作表不存在!"; if (iMyWorkbook != null) { iMyWorkbook.Dispose(); } return false; } HSSFSheet iSheet = (HSSFSheet)iMyWorkbook.GetSheetAt(iSheetIndex); IEnumerator iRows = iSheet.GetRowEnumerator(); for (Int32 ii = FirstRow; ii <= iSheet.LastRowNum; ii++) { HSSFRow iRow = (HSSFRow)iSheet.GetRow(ii); if (iRow == null) { continue; } Int32 iDataColIndes = 0; DataRow iDataRow = InDataTable.NewRow(); for (Int32 iii = FirstCol; iii < iRow.LastCellNum; iii++) { HSSFCell iCell = (HSSFCell)iRow.GetCell(iii); if (iCell == null) { iDataRow = null; break; } if (InDataTable.Columns[iDataColIndes] == null) { iDataRow = null; break; } if (iCell.CellType == CellType.BLANK || iCell.CellType == CellType.Unknown) { if (!InDataTable.Columns[iDataColIndes].AllowDBNull) { iDataRow = null; break; } } switch (Type.GetTypeCode(InDataTable.Columns[iDataColIndes].DataType)) { case TypeCode.Boolean: { if (iCell.CellType != CellType.BOOLEAN) { iDataRow = null; break; } iDataRow[iDataColIndes] = iCell.BooleanCellValue; break; } case TypeCode.Char: { if (iCell.CellType != CellType.STRING) { iDataRow = null; break; } iDataRow[iDataColIndes] = iCell.StringCellValue[0]; break; } case TypeCode.DateTime: { if (iCell.CellType != CellType.NUMERIC) { iDataRow = null; break; } iDataRow[iDataColIndes] = iCell.DateCellValue; break; } case TypeCode.Decimal: { if (iCell.CellType != CellType.NUMERIC) { iDataRow = null; break; } Decimal iCellValue = (Decimal)iCell.NumericCellValue; if (iCellValue > Decimal.MaxValue || iCellValue < Decimal.MinValue) { iDataRow = null; break; } iDataRow[iDataColIndes] = iCellValue; break; } case TypeCode.Double: { if (iCell.CellType != CellType.NUMERIC) { iDataRow = null; break; } if (iCell.NumericCellValue > Double.MaxValue || iCell.NumericCellValue < Double.MinValue) { iDataRow = null; break; } iDataRow[iDataColIndes] = iCell.NumericCellValue; break; } case TypeCode.Int16: { if (iCell.CellType != CellType.NUMERIC) { iDataRow = null; break; } Int16 iCellValue = (Int16)iCell.NumericCellValue; if (iCellValue > Int16.MaxValue || iCellValue < Int16.MinValue) { iDataRow = null; break; } iDataRow[iDataColIndes] = iCellValue; break; } case TypeCode.Int32: { if (iCell.CellType != CellType.NUMERIC) { iDataRow = null; break; } Int32 iCellValue = (Int32)iCell.NumericCellValue; if (iCellValue > Int32.MaxValue || iCellValue < Int32.MinValue) { iDataRow = null; break; } iDataRow[iDataColIndes] = iCellValue; break; } case TypeCode.Int64: { if (iCell.CellType != CellType.NUMERIC) { iDataRow = null; break; } Int64 iCellValue = (Int64)iCell.NumericCellValue; if (iCellValue > Int64.MaxValue || iCellValue < Int64.MinValue) { iDataRow = null; break; } iDataRow[iDataColIndes] = iCellValue; break; } case TypeCode.String: { iDataRow[iDataColIndes] = iCell.StringCellValue; break; } } if (iDataRow == null) { break; } iDataColIndes++; } if (iDataRow != null) { InDataTable.Rows.Add(iDataRow); } } if (iSheet != null) { iSheet.Dispose(); } if (iMyWorkbook != null) { iMyWorkbook.Dispose(); } return true; } 

 

以上是打開一個Excel文件。

 

 

/// <summary> /// 導出到EXCEL文件 /// </summary> /// <param name="MyExpData">需要導出的相關</param> /// <param name="FilePath">導出的全路徑</param> /// <returns>成功則返回true，出錯，即使是一條數據出錯都返回false</returns> public static Boolean ExportExcelFile(C_ExpInfo MyExpData, String FilePath) { errMeg = ""; Boolean iRetbool = true; List<String> iMySheetNameList = new List<String>();//記錄已經存在的工作表，防止重複。 Dictionary<String, String> iSeleColName = new Dictionary<String, String>(); Int32 iMyUserRow = 0; if ((!(MyExpData.ExpData.Tables.Contains("AllInfo"))) || (!(MyExpData.ExpData.Tables.Contains("ExpSheets")))) { errMeg = "導出的表集內缺少必需表（AllInfo、ExpSheets）"; return false; } DataTable iExpSheetsDataTable = MyExpData.ExpData.Tables["ExpSheets"]; DataTable iAllInfoDataTable = MyExpData.ExpData.Tables["AllInfo"]; if (iExpSheetsDataTable.Rows.Count <= 0) { errMeg = "沒有需要導出的數據信息"; return false; } int iExpDataRowCount = iExpSheetsDataTable.Rows.Count; HSSFWorkbook iMyWorkB = new HSSFWorkbook(); Frm_Schedule iMyFrm_Schedule = new Frm_Schedule(); for (int i = 0; i < iExpDataRowCount; i++) { HSSFSheet iMySheet = null; DataRow[] iMyExpInfo = null; String iMyDataName = ""; String iMySheetName = ""; DataTable iCurrentDataTable = null; #region 準備數據 try { iMySheetName = iExpSheetsDataTable.Rows[i]["ExpSheetName"].ToString();//導出EXCEL表的表名 iMyDataName = iExpSheetsDataTable.Rows[i]["ExpDataName"].ToString();//導出的數據表名 Int32 iExpID = (Int32)iExpSheetsDataTable.Rows[i]["ExpID"];//導出的ID（用對應AllInfo的ID） Boolean iIfUserSele = (Boolean)iExpSheetsDataTable.Rows[i]["IfUserSele"]; if ((!MyExpData.ExpData.Tables.Contains(iMyDataName))) { errMeg = "不存在需要導出的數據表！(" + iMyDataName + ")"; iRetbool = false; continue; } iCurrentDataTable = MyExpData.ExpData.Tables[iMyDataName]; if (iCurrentDataTable.Rows.Count == 0) { continue; } if (iMySheetNameList.Contains(iMySheetName)) { continue; } else { iMySheetNameList.Add(iMySheetName); } int iExpDataCount = iCurrentDataTable.Rows.Count; if (iIfUserSele) { Frm_SeleCol iMyFrm_SeleCol = new Frm_SeleCol(MyExpData.ClumnName); if (iMyFrm_SeleCol.ShowDialog() == System.Windows.Forms.DialogResult.OK) { iSeleColName = iMyFrm_SeleCol.MySeleCol; } iMyFrm_SeleCol.Close(); } if (iSeleColName.Count == 0) { continue; } iMyFrm_Schedule.Init(iExpDataCount); iMyFrm_Schedule.Visible = true; iMySheet = (HSSFSheet)iMyWorkB.CreateSheet(iMySheetName); iMyExpInfo = iAllInfoDataTable.Select("ID=" + iExpID.ToString()); } catch (Exception iErr_ZhB) { errMeg += "準備第 " + i.ToString() + " 個表數據時出錯！" + iErr_ZhB.Message; iRetbool = false; continue; } #endregion #region 表附加設計 try { foreach (DataRow iMyInfoRow in iMyExpInfo) { Boolean iIfRag = (Boolean)iMyInfoRow["IfRag"]; Boolean iIfAutoCol = (Boolean)iMyInfoRow["IfAutoCol"];//標識該合併單元格是否使用自動取列數 Int32 iCellRowIndex = (Int32)iMyInfoRow["RowNum_B"]; Int32 iCellColIndex = (Int32)iMyInfoRow["ColNum_B"]; HSSFRow iCellRow = (HSSFRow)iMySheet.GetRow(iCellRowIndex); if (iCellRow == null) { iCellRow = (HSSFRow)iMySheet.CreateRow(iCellRowIndex); } HSSFCell iCell = (HSSFCell)iCellRow.GetCell(iCellColIndex); if (iCell == null) { iCell = (HSSFCell)iCellRow.CreateCell(iCellColIndex, CellType.STRING); } iCell.SetCellValue(iMyInfoRow["Text"].ToString()); HSSFCellStyle iCellStyle = (HSSFCellStyle)iMyWorkB.CreateCellStyle(); iCellStyle.Alignment = HorizontalAlignment.CENTER; HSSFFont iCellFont = (HSSFFont)iMyWorkB.CreateFont(); short iFontSize=(short)iMyInfoRow["Fonts"]; iCellFont.FontHeight = (short)(iFontSize * iFontSize); iCellStyle.SetFont(iCellFont); iCell.CellStyle = iCellStyle; if (iIfRag) { Int32 iRegionColCount = 0; Int32 iRegionRowCount = (Int32)iMyInfoRow["RowSum"]; if (iIfAutoCol) { iRegionColCount = iSeleColName.Count; } else { iRegionColCount = (Int32)iMyInfoRow["ColSum"]; } iMySheet.AddMergedRegion(new CellRangeAddress(iCellRowIndex, (iCellRowIndex + iRegionRowCount - 1) , iCellColIndex, (iCellColIndex + iRegionColCount - 1))); if (iMyUserRow < iCellRowIndex + iRegionRowCount) { iMyUserRow = iCellRowIndex + iRegionRowCount; } } else { if (iMyUserRow < iCellRowIndex) { iMyUserRow = iCellRowIndex; } } } } catch (Exception iErr_Bfj) { errMeg += "導出第 " + i.ToString() + " 個表表頭時出錯！" + iErr_Bfj.Message; iRetbool = false; continue; } #endregion #region 導出數據 try { Int32 iCurrColNum = 0; for (Int32 a = 0; a < iCurrentDataTable.Columns.Count; a++) { String iMyColName = iCurrentDataTable.Columns[a].ColumnName; if (iSeleColName.ContainsKey(iMyColName)) { HSSFRow iRowHand = (HSSFRow)iMySheet.GetRow(iMyUserRow); if (iRowHand == null) { iRowHand = (HSSFRow)iMySheet.CreateRow(iMyUserRow); } HSSFCell iCellHand = (HSSFCell)iRowHand.GetCell(iCurrColNum); if (iCellHand == null) { iCellHand = (HSSFCell)iRowHand.CreateCell(iCurrColNum, CellType.STRING); } iCellHand.SetCellValue(iSeleColName[iMyColName]); iCurrColNum++; } } iMyUserRow++; for (int b = 0; b < iCurrentDataTable.Rows.Count; b++) { iCurrColNum = 0; for (int c = 0; c < iCurrentDataTable.Columns.Count; c++) { if (iSeleColName.ContainsKey(iCurrentDataTable.Columns[c].ColumnName)) { HSSFRow iRowValue = (HSSFRow)iMySheet.GetRow(iMyUserRow); if (iRowValue == null) { iRowValue = (HSSFRow)iMySheet.CreateRow(iMyUserRow); } HSSFCell iCellValue = (HSSFCell)iRowValue.GetCell(iCurrColNum); if (iCellValue == null) { iCellValue = (HSSFCell)iRowValue.CreateCell(iCurrColNum, CellType.STRING); } iCellValue.SetCellValue(iCurrentDataTable.Rows[b][c].ToString()); iCurrColNum++; } } if (iMyUserRow > MyExpData.MaxRow) break; iMyUserRow++; iMyFrm_Schedule.ChValue(); } } catch (Exception iErr_DCh) { errMeg += "導出第 " + i.ToString() + " 個表數據時出錯！" + iErr_DCh.Message; iRetbool = false; continue; } #endregion } iMyFrm_Schedule.Close(); try { using (FileStream iFile = new FileStream(FilePath, FileMode.Create, FileAccess.Write)) { iMyWorkB.Write(iFile); } } catch (Exception Err) { errMeg = "保存文件出錯！" + Err.Message; return false; } iMyWorkB.Dispose(); return iRetbool; } 

 

以上是導出到Excel，裏面用了自己定義的一個類，用來放一些導出的一些設置和數據。裏面用DataSet來放相關設置和數據，主要考慮到一次多出多個文件。

 

 

因爲NPOI目前還不支持office2007，所以有必要做一下文件的判斷，其實NPOI的源碼裏也有這個判斷的，但是自己先判斷一下，不符合的直接不打開。

/// <summary> /// 檢查指定文件是否03或以下版本 /// </summary> /// <param name="File">文件路徑</param> /// <returns></returns> public static Boolean CheckIsExcel03File(Stream File) { if (File == null) { return false; } BinaryReader iFileReader = new BinaryReader(File); ulong iTempNum = iFileReader.ReadUInt64(); Int32 iTempNum2 = (Int32)(iTempNum & ((ulong)0xffffL)); File.Seek(-8L, SeekOrigin.Current); if (iTempNum == 16220472316735377360L) { iFileReader.Close(); return true; } iFileReader.Close(); return false; } 

 

項目源碼：http://download.csdn.net/source/2912158