基于NPOI开源框架写的ExcelHelper
namespace ExcelTest { using System; using System.Collections.Generic; using System.Data; using System.IO; using System.Text; using System.Web; using NPOI; using NPOI.HPSF; using NPOI.HSSF; using NPOI.HSSF.UserModel; using NPOI.HSSF.Util; using NPOI.POIFS; using NPOI.Util; using NPOI.SS.UserModel; using NPOI.SS.Util; 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> public static void Export(DataTable dtSource, string strHeaderText, string strFileName) { using (MemoryStream ms = Export(dtSource, strHeaderText)) { 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> public static MemoryStream Export(DataTable dtSource, string strHeaderText) { HSSFWorkbook workbook = new HSSFWorkbook(); HSSFSheet sheet = workbook.CreateSheet() as HSSFSheet; #region 右击文件 属性信息 { DocumentSummaryInformation dsi = PropertySetFactory.CreateDocumentSummaryInformation(); dsi.Company = "tewuapple"; workbook.DocumentSummaryInformation = dsi; SummaryInformation si = PropertySetFactory.CreateSummaryInformation(); si.Author = "sunzq"; //填加xls文件作者信息 si.ApplicationName = "NPOI测试程序"; //填加xls文件创建程序信息 si.LastAuthor = "孙自强"; //填加xls文件最后保存者信息 si.Comments = "说明信息"; //填加xls文件作者信息 si.Title = "NPOI测试"; //填加xls文件标题信息 si.Subject = "NPOI测试Demo";//填加文件主题信息 si.CreateDateTime = DateTime.Now; workbook.SummaryInformation = si; } #endregion HSSFCellStyle dateStyle = workbook.CreateCellStyle() as HSSFCellStyle; HSSFDataFormat format = workbook.CreateDataFormat() as HSSFDataFormat; dateStyle.DataFormat = format.GetFormat("yyyy-mm-dd"); //取得列宽 int[] arrColWidth = new int[dtSource.Columns.Count]; 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 < dtSource.Columns.Count; j++) { int intTemp = Encoding.GetEncoding(936).GetBytes(dtSource.Rows[i][j].ToString()).Length; if (intTemp > arrColWidth[j]) { arrColWidth[j] = intTemp; } } } 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() as HSSFSheet; } #region 表头及样式 { HSSFRow headerRow = sheet.CreateRow(0) as HSSFRow; headerRow.HeightInPoints = 25; headerRow.CreateCell(0).SetCellValue(strHeaderText); HSSFCellStyle headStyle = workbook.CreateCellStyle() as HSSFCellStyle; headStyle.Alignment = HorizontalAlignment.CENTER; HSSFFont font = workbook.CreateFont() as HSSFFont; font.FontHeightInPoints = 20; font.Boldweight = 700; headStyle.SetFont(font); headerRow.GetCell(0).CellStyle = headStyle; sheet.AddMergedRegion(new CellRangeAddress(0, 0, 0, dtSource.Columns.Count - 1)); } #endregion #region 列头及样式 { HSSFRow headerRow = sheet.CreateRow(1) as HSSFRow; HSSFCellStyle headStyle = workbook.CreateCellStyle() as HSSFCellStyle; headStyle.Alignment = HorizontalAlignment.CENTER; HSSFFont font = workbook.CreateFont() as HSSFFont; font.FontHeightInPoints = 10; font.Boldweight = 700; headStyle.IsLocked = true; headStyle.SetFont(font); 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); } sheet.CreateFreezePane(0, 2, 0, dtSource.Columns.Count - 1); } #endregion rowIndex = 2; } #endregion #region 填充内容 HSSFRow dataRow = sheet.CreateRow(rowIndex) as HSSFRow; foreach (DataColumn column in dtSource.Columns) { HSSFCell newCell = dataRow.CreateCell(column.Ordinal) as HSSFCell; string drValue = row[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; } } #endregion rowIndex++; } using (MemoryStream ms = new MemoryStream()) { workbook.Write(ms); ms.Flush(); ms.Position = 0; return ms; } } /// <summary> /// 用于Web导出 /// </summary> /// <param name="dtSource">源DataTable</param> /// <param name="strHeaderText">表头文本</param> /// <param name="strFileName">文件名</param> public static void ExportByWeb(DataTable dtSource, string strHeaderText, string strFileName) { 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).GetBuffer()); curContext.Response.End(); } /// <summary>读取excel /// 默认第一行为标头 /// </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); } HSSFSheet sheet = hssfworkbook.GetSheetAt(0) as HSSFSheet; System.Collections.IEnumerator rows = sheet.GetRowEnumerator(); HSSFRow headerRow = sheet.GetRow(0) as HSSFRow; int cellCount = headerRow.LastCellNum; for (int j = 0; j < cellCount; j++) { HSSFCell cell = headerRow.GetCell(j) as HSSFCell; dt.Columns.Add(cell.ToString()); } for (int i = (sheet.FirstRowNum + 1); i <= sheet.LastRowNum; i++) { HSSFRow row = sheet.GetRow(i) as HSSFRow; 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; } } }
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参考资料：
http://www.cnblogs.com/wangrsh2010/archive/2012/03/21/2410182.html