先去官网：http://npoi.codeplex.com/下载需要引入dll（可以选择.net2.0或者.net4.0的dll），然后在网站中添加引用。
另：http://files.cnblogs.com/zhongxinWang/NPOI.rar
List<>作为数据源
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//创建Excel文件的对象NPOI.HSSF.UserModel.HSSFWorkbook book = new
NPOI.HSSF.UserModel.HSSFWorkbook();//添加一个sheetNPOI.SS.UserModel.ISheet sheet1 = book.CreateSheet("降雨量日报表");//获取list数据List<ST_RainInfo_Day> listRainInfo = ST_RainInfo_Day_Helper.ObjectList(dtBeginDate, dtEndDate);//给sheet1添加第一行的头部标题NPOI.SS.UserModel.IRow row1 = sheet1.CreateRow(0);row1.CreateCell(0).SetCellValue("站名");row1.CreateCell(1).SetCellValue("河名");row1.CreateCell(2).SetCellValue("地址");row1.CreateCell(3).SetCellValue("日雨量");row1.CreateCell(4).SetCellValue("时间");row1.CreateCell(5).SetCellValue("天气");//将数据逐步写入sheet1各个行 for
(int
i = 0; i < listRainInfo.Count; i++) { NPOI.SS.UserModel.IRow rowtemp = sheet1.CreateRow(i + 1); rowtemp.CreateCell(0).SetCellValue(listRainInfo[i].STNM.ToString()); rowtemp.CreateCell(1).SetCellValue(listRainInfo[i].RVNM.ToString()); rowtemp.CreateCell(2).SetCellValue(listRainInfo[i].STLC.ToString()); rowtemp.CreateCell(3).SetCellValue(listRainInfo[i].DYP.ToString()); rowtemp.CreateCell(4).SetCellValue(listRainInfo[i].TM.ToString()); //用GetWether方法进行数据转换 rowtemp.CreateCell(5).SetCellValue(GetWether(listRainInfo[i].WTH.ToString())); }// 写入到客户端 System.IO.MemoryStream ms = new
System.IO.MemoryStream();book.Write(ms);Response.AddHeader("Content-Disposition", string.Format("attachment; filename={0}.xls", DateTime.Now.ToString("yyyyMMddHHmmssfff")));Response.BinaryWrite(ms.ToArray());book = null;ms.Close();ms.Dispose(); |
DataTable作为数据源
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DataTable dt = GetData();NPOI.HSSF.UserModel.HSSFWorkbook book = new
NPOI.HSSF.UserModel.HSSFWorkbook();NPOI.SS.UserModel.ISheet sheet1 = book.CreateSheet("特征值报表");//雨情NPOI.SS.UserModel.IRow row1 = sheet1.CreateRow(0);row1.CreateCell(0).SetCellValue("站号");row1.CreateCell(1).SetCellValue("站名");row1.CreateCell(2).SetCellValue("平均降雨(mm)");row1.CreateCell(3).SetCellValue("总降雨量(mm)");row1.CreateCell(4).SetCellValue("最大测站降雨(mm)");row1.CreateCell(5).SetCellValue("最小测站降雨(mm)"); for
(int
i = 0; i < dt.Rows.Count; i++) { NPOI.SS.UserModel.IRow rowtemp = sheet1.CreateRow(i + 1); rowtemp.CreateCell(0).SetCellValue(dt.Rows[i]["STCD"].ToString()); rowtemp.CreateCell(1).SetCellValue(dt.Rows[i]["STNM"].ToString()); rowtemp.CreateCell(2).SetCellValue(dt.Rows[i]["AvgDYP"].ToString()); rowtemp.CreateCell(3).SetCellValue(dt.Rows[i]["SumDYP"].ToString()); rowtemp.CreateCell(4).SetCellValue(dt.Rows[i]["MaxDYP"].ToString()); rowtemp.CreateCell(5).SetCellValue(dt.Rows[i]["MinDYP"].ToString()); }// 写入到客户端 System.IO.MemoryStream ms = new
System.IO.MemoryStream();book.Write(ms);Response.AddHeader("Content-Disposition", string.Format("attachment; filename={0}.xls", DateTime.Now.ToString("yyyyMMddHHmmssfff")));Response.BinaryWrite(ms.ToArray());book = null;ms.Close();ms.Dispose(); |
可先将excel文件上传到服务器的临时位置，获取filePath，然后再行读取、导入。
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HSSFWorkbook hssfworkbook; #region public
DataTable ImportExcelFile(string
filePath) { #region//初始化信息 try { using
(FileStream file = new
FileStream(filePath, FileMode.Open, FileAccess.Read)) { hssfworkbook = new
HSSFWorkbook(file); } } catch
(Exception e) { throw
e; } #endregion NPOI.SS.UserModel.Sheet sheet = hssfworkbook.GetSheetAt(0); System.Collections.IEnumerator rows = sheet.GetRowEnumerator(); DataTable dt = new
DataTable(); //给DdataTable添加表头 for
(int
j = 0; j < (sheet.GetRow(0).LastCellNum); j++) { dt.Columns.Add(Convert.ToChar(((int)‘A‘) + j).ToString()); } //读取数据 while
(rows.MoveNext()) { HSSFRow row = (HSSFRow)rows.Current; DataRow dr = dt.NewRow(); for
(int
i = 0; i < row.LastCellNum; i++) { NPOI.SS.UserModel.Cell cell = row.GetCell(i); if
(cell == null) { dr[i] = null; } else { dr[i] = cell.ToString(); } } dt.Rows.Add(dr); } return
dt; } #endregion |
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//创建Excel文件的对象 NPOI.HSSF.UserModel.HSSFWorkbook book = new
NPOI.HSSF.UserModel.HSSFWorkbook(); //添加一个sheet NPOI.SS.UserModel.ISheet sheet1 = book.CreateSheet("sheet1"); //sheet列表,防止记录条数大于65535 List<NPOI.SS.UserModel.ISheet> sheetList = new
List<NPOI.SS.UserModel.ISheet>(); sheetList.Add(sheet1);//给sheet1添加数据 SheetFirst(sheet1, book, datalist); //给其他sheet添加数据 从1开始：去掉第一个sheet +2是有表头和标题的那2行 int
rows = datalist.Count + 2; int
p = rows % 65535 == 0 ? rows / 65535 : (rows / 65535) + 1; for
(int
i = 1; i < p; i++) { NPOI.SS.UserModel.ISheet sheet = book.CreateSheet("sheet"
+ (i + 1).ToString()); //为sheet添加数据 SheetElse(sheet, (i - 1) * 65535 + 65533, datalist); } // 写入到客户端 System.IO.MemoryStream ms = new
System.IO.MemoryStream(); book.Write(ms); Response.AddHeader("Content-Disposition", string.Format("attachment; filename={0}.xls", DateTime.Now.ToString("yyyyMMddHHmmssfff"))); Response.BinaryWrite(ms.ToArray()); book = null; ms.Close(); ms.Dispose(); |
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//第一个Sheet protected
void SheetFirst(NPOI.SS.UserModel.ISheet sheet1, NPOI.HSSF.UserModel.HSSFWorkbook book, List<ST_WaterLevel_GradualMonth> datalist) { //标题 NPOI.SS.UserModel.ICell cellTitle = sheet1.CreateRow(0).CreateCell(0); cellTitle.SetCellValue("水位月报表--"
+ drpCategory.SelectedItem.Text); //设置标题行样式 NPOI.SS.UserModel.ICellStyle style = book.CreateCellStyle(); style.Alignment = NPOI.SS.UserModel.HorizontalAlignment.CENTER; NPOI.SS.UserModel.IFont font = book.CreateFont(); font.FontHeight = 20 * 20; style.SetFont(font); cellTitle.CellStyle = style; //合并标题行 sheet1.AddMergedRegion(new
NPOI.SS.Util.CellRangeAddress(0, 0, 0, 9)); //给sheet1添加第一行的头部标题 NPOI.SS.UserModel.IRow row1 = sheet1.CreateRow(1); row1.CreateCell(0).SetCellValue("序号"); row1.CreateCell(1).SetCellValue("测站编码"); row1.CreateCell(2).SetCellValue("测站名称"); row1.CreateCell(3).SetCellValue("河流名称"); row1.CreateCell(4).SetCellValue("日期"); row1.CreateCell(5).SetCellValue("平均水位"); row1.CreateCell(6).SetCellValue("八点水位"); row1.CreateCell(7).SetCellValue("零点水位"); //将数据逐步写入sheet1各个行 for
(int
i = 0; i < datalist.Count; i++) { NPOI.SS.UserModel.IRow rowtemp = sheet1.CreateRow(i + 2); rowtemp.CreateCell(0).SetCellValue(datalist[i].Row.ToString()); rowtemp.CreateCell(1).SetCellValue(datalist[i].STCD.ToString()); rowtemp.CreateCell(2).SetCellValue(datalist[i].STNM.ToString()); rowtemp.CreateCell(3).SetCellValue(datalist[i].RVNM.ToString()); rowtemp.CreateCell(4).SetCellValue(datalist[i].TM.ToString()); rowtemp.CreateCell(5).SetCellValue(datalist[i].AvgLevel.ToString()); rowtemp.CreateCell(6).SetCellValue(datalist[i].EightLevel.ToString()); rowtemp.CreateCell(7).SetCellValue(datalist[i].ZeroLevel.ToString()); } } |
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//其他sheet protected
void SheetElse(NPOI.SS.UserModel.ISheet sheet, int
j, List<ST_WaterLevel_GradualMonth> datalist) { //将数据逐步写入sheet1各个行 for
(int
i = 0; j + i < datalist.Count; i++) { NPOI.SS.UserModel.IRow rowtemp = sheet.CreateRow(i); rowtemp.CreateCell(0).SetCellValue(datalist[j + i].Row.ToString()); rowtemp.CreateCell(1).SetCellValue(datalist[j + i].STCD.ToString()); rowtemp.CreateCell(2).SetCellValue(datalist[j + i].STNM.ToString()); rowtemp.CreateCell(3).SetCellValue(datalist[j + i].RVNM.ToString()); rowtemp.CreateCell(4).SetCellValue(datalist[j + i].TM.ToString()); rowtemp.CreateCell(5).SetCellValue(datalist[j + i].AvgLevel.ToString()); rowtemp.CreateCell(6).SetCellValue(datalist[j + i].ZeroLevel.ToString()); } } |
转自http://www.cnblogs.com/zhongxinWang/archive/2012/08/07/2627476.html
Asp.net操作Excel（终极方法NPOI）(转),布布扣,bubuko.com
原文：http://www.cnblogs.com/luwenlong/p/3613287.html