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【Asp.Net】利用NOPI处理Excel
作者:Sarah / 发布于2015/3/24/ 826

	using System;
	using System.Data;
	using System.IO;
	using System.Text;
	using System.Web;
	using NPOI.HPSF;
	using NPOI.HSSF.UserModel;
	using NPOI.SS.UserModel;
	
	public class ExcelHelper
	{
	 /// <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://....../";
	 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 = "NPOI"; //填加xls文件创建程序信息
	 si.LastAuthor = "OA系统"; //填加xls文件最后保存者信息
	 si.Comments = "OA系统自动创建文件"; //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;
	 }
	}
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