NPOI导出excel

 1 try
 2                 {
 3                     string strExcelNamePart ="测试报表";
 4                     string strBeginTime="2015-04-02 15:00:00";
 5                     conn.Open();
 6                     dt =  SqlHelper.ExecuteDataTable(conn, CommandType.Text, "select * from tb");
 7                     //格式化数据
 8                     dt = FormatData(dt, strExcelModel);
 9 
10                     string filepath = Server.MapPath("/download") + "/" + strExcelNamePart + strBeginTime.Replace("-", "").Replace(":", "").Replace(" ", "") + ".xls";
11 
12                     ExcelHelper.CreateExcel(dt, filepath, "xx报表");
13                     hlink.Visible = true;
14                     hlink.Text = txtBeginTime.Text.Trim() + ".xls";
15                     hlink.NavigateUrl = filepath.Replace(Server.MapPath("/"), "/");
16 
17                 }
18                 catch (Exception e)
19                 {
20                 }
21                 finally
22                 {
23                     conn.Close();
24                 }

  1  public class ExcelHelper
  2     {
  3         public static bool CreateExcel(DataTable dt, string path, string name)
  4         {
  5             List<string> exceltitlelist = new List<string>();
  6             foreach (DataColumn dc in dt.Columns)
  7             {
  8                 exceltitlelist.Add(dc.ColumnName);
  9             }
 10             try
 11             {
 12                 NPOI.HSSF.UserModel.HSSFWorkbook workbook = new NPOI.HSSF.UserModel.HSSFWorkbook();
 13                 NPOI.SS.UserModel.ISheet sheet = workbook.CreateSheet(name);
 14                 sheet.AutoSizeColumn(0);
 15                 var cellFont = workbook.CreateFont();
 16                 var cellStyle = workbook.CreateCellStyle();
 17                 var cellStyle2 = workbook.CreateCellStyle();
 18                 ////- 加粗，白色前景色
 19                 cellFont.Boldweight = (short)NPOI.SS.UserModel.FontBoldWeight.BOLD;
 20                 ////- 这个是填充的模式，可以是网格、花式等。如果需要填充单色，请使用：SOLID_FOREGROUND
 21                 ////cellStyle.FillPattern = NPOI.SS.UserModel.FillPatternType.SOLID_FOREGROUND;
 22                 ////- 设置这个样式的字体，如果没有设置，将与所有单元格拥有共同字体！
 23                 cellStyle.SetFont(cellFont);
 24                 cellStyle.Alignment = NPOI.SS.UserModel.HorizontalAlignment.CENTER;
 25                 cellStyle2.Alignment = NPOI.SS.UserModel.HorizontalAlignment.CENTER;
 26                 //CellStyle cellStyleDate = workbook.CreateCellStyle();
 27                 //DataFormat format = workbook.CreateDataFormat();
 28                 //cellStyleDate.DataFormat = format.GetFormat("yyyy年m月d日");                                            
 29 
 30                 string[] titles = exceltitlelist.ToArray();
 31 
 32                 int rowIndex = 0;
 33                 NPOI.SS.UserModel.IRow row = sheet.CreateRow(rowIndex);
 34                 for (int i = 0; i < titles.Length; i++) //生成sheet第一行列名 
 35                 {
 36                     NPOI.SS.UserModel.ICell celltmp = row.CreateCell(i);
 37                     celltmp.SetCellValue(titles[i]);
 38                     celltmp.CellStyle = cellStyle;
 39                 }
 40                 NPOI.SS.UserModel.ICell cell;
 41                 rowIndex++;
 42                 string tmp;
 43                 DataRow m;
 44 
 45                 for (int i = 0; i < dt.Rows.Count; i++)
 46                 {
 47                     try
 48                     {
 49                         m = dt.Rows[i];
 50                         row = sheet.CreateRow(rowIndex);
 51 
 52                         for (int j = 0; j < titles.Length; j++)
 53                         {
 54                             cell = row.CreateCell(j);
 55                             cell.CellStyle = cellStyle2;
 56                             cell.SetCellValue(m.ItemArray[j].ToString());
 57                         }
 58                         rowIndex++;
 59                     }
 60                     catch (Exception e1)
 61                     {
 62                         //logclass.Debug("===== 生成excel报错 =====" + e1.Message);
 63                     }
 64 
 65                 }
 66 
 67                 sheet.ForceFormulaRecalculation = true;
 68 
 69                 using (FileStream file = new FileStream(path, FileMode.Create))
 70                 {
 71                     workbook.Write(file);　　//创建xls文件。
 72                     file.Close();
 73                 }
 74             }
 75             catch (Exception e)
 76             {
 77                 //policyframework.common.logclass.Debug("=====CreateExcel 生成excel报错 =====" + e.Message);
 78                 return false;
 79             }
 80             return true;
 81 
 82 
 83 
 84         }
 85 
 86         public static DataTable GetExcelDataASODBC(string path, string sql)
 87         {
 88             OdbcConnection Connnection = new OdbcConnection();
 89             Connnection.ConnectionString = "Driver={Microsoft Excel Driver (*.xls)};DBQ=" + path;
 90             OdbcCommand cmd = new OdbcCommand();
 91             cmd.Connection = Connnection;
 92             cmd.CommandText = sql;
 93             OdbcDataAdapter oda = new OdbcDataAdapter(cmd);
 94             DataTable dt = new DataTable();
 95             oda.Fill(dt);
 96             Connnection.Close();
 97             return dt;
 98         }
 99 
100         public static DataTable GetExcelDataAsTableNPOI(string fileName)
101         {
102             using (FileStream fs = new FileStream(fileName, FileMode.Open))
103             {
104                 HSSFWorkbook wb = new HSSFWorkbook(fs);
105                 NPOI.SS.UserModel.ISheet sheet = wb.GetSheetAt(0);
106                 DataTable table = new DataTable();
107                 //由第一列取標題做為欄位名稱
108                 NPOI.SS.UserModel.IRow headerRow = sheet.GetRow(0);
109                 int cellCount = headerRow.LastCellNum;
110                 for (int i = headerRow.FirstCellNum; i < cellCount; i++)
111                     //以欄位文字為名新增欄位，此處全視為字串型別以求簡化
112                     table.Columns.Add(
113                         new DataColumn(headerRow.GetCell(i).StringCellValue));
114 
115                 NPOI.SS.UserModel.IRow row;
116                 DataRow dataRow;
117                 //略過第零列(標題列)，一直處理至最後一列
118                 for (int i = (sheet.FirstRowNum + 1); i <= sheet.LastRowNum; i++)
119                 {
120                     row = sheet.GetRow(i);
121                     if (row == null) continue;
122                     dataRow = table.NewRow();
123                     //依先前取得的欄位數逐一設定欄位內容
124                     for (int j = row.FirstCellNum; j < cellCount; j++)
125                         if (row.GetCell(j) != null)
126                             //如要針對不同型別做個別處理，可善用.CellType判斷型別
127                             //再用.StringCellValue, .DateCellValue, .NumericCellValue...取值
128                             //此處只簡單轉成字串
129                             dataRow[j] = row.GetCell(j).ToString();
130                     table.Rows.Add(dataRow);
131                 }
132                 return table;
133             }
134         }
135 
136     }

 1         /// <summary>
 2         /// 处理table数据
 3         /// </summary>
 4         /// <param name="dt">要处理的DataTable</param>
 5         ///<param name="strExcelModel">模板类型</param>
 6         /// <returns></returns>
 7         private DataTable FormatData(DataTable dt, string strExcelModel)
 8         {
 9             //设置表格格式
10             DataTable result = dt.Clone();
11             result.Clear();
12             //foreach (DataColumn item in result.Columns)
13             //{
14             //    item.DataType = typeof(String);
15             //}
16             #region 整理excel数据
17             switch (strExcelModel)
18             {
19                 case "1":
20                     {
21                         #region 1qn
22                         result.Columns["销售起始日期"].DataType = typeof(String);
23                         result.Columns["销售结束日期"].DataType = typeof(String);
24 
25                         DataRow[] rowstmp = dt.Select("", "[销售结束日期],[销售结束日期] asc");
26                         decimal dlyprice = 0;
27                         for (int i = 0; i < rowstmp.Length; i++)
28                         {
29                             if (decimal.TryParse(rowstmp[i]["票面价/折扣"].ToString().Trim(), out dlyprice))
30                             {
31                                 DataRow rowNew = result.NewRow();
32                                 #region row数据
33                                 rowNew["票面价/折扣"] = (dlyprice + 100).ToString(); //票面价+100 
34                                 rowNew["销售起始日期"] = Convert.ToDateTime(rowstmp[i]["销售起始日期"]).ToString("yyyy-MM-dd");
35                                 rowNew["销售结束日期"] = Convert.ToDateTime(rowstmp[i]["销售结束日期"]).ToString("yyyy-MM-dd");
36                                 #endregion row
37                                 result.Rows.Add(rowNew);
38                             }
39                         }
40                         break;
41                         #endregion 1qn
42                     }
43                 default:
44                     break;
45 
46             }
47             #endregion 整理excel数据
48 
49             return result;
50         }
51         #endregion 导出excel
52 
53     }