NPOI操作excel之读取excel数据

NPOI 是 POI 项目的 .NET 版本。POI是一个开源的Java读写Excel、WORD等微软OLE2组件文档的项目。

 一、下载引用

去NPOI官网http://npoi.codeplex.com/下载需要引用的dll,即:NPOI.dll,NPOI.OOXML.dll,NPOI.OpenXml4Net.dll,ICSharpCode.SharpZipLib.dll(office2007版需要此dll)。

二、Excel转datatable类

excel数据:

Excel转datatable类如下:

  1 using System;
  2 using System.Data;
  3 using System.IO;
  4 using NPOI.SS.UserModel;
  5 using NPOI.XSSF.UserModel;
  6 using NPOI.HSSF.UserModel;
  7 
  8 namespace NPOIOprateExcel
  9 {
 10     public class ExcelUtility
 11     {
 12         /// <summary>
 13         /// 将excel导入到datatable
 14         /// </summary>
 15         /// <param name="filePath">excel路径</param>
 16         /// <param name="isColumnName">第一行是否是列名</param>
 17         /// <returns>返回datatable</returns>
 18         public static DataTable ExcelToDataTable(string filePath, bool isColumnName)
 19         {
 20             DataTable dataTable = null;
 21             FileStream fs = null;
 22             DataColumn column = null;
 23             DataRow dataRow = null;
 24             IWorkbook workbook = null;
 25             ISheet sheet = null;
 26             IRow row = null;
 27             ICell cell = null;
 28             int startRow = 0;
 29             try
 30             {
 31                 using (fs = File.OpenRead(filePath))
 32                 {
 33                     // 2007版本
 34                     if (filePath.IndexOf(".xlsx") > 0)
 35                         workbook = new XSSFWorkbook(fs);
 36                     // 2003版本
 37                     else if (filePath.IndexOf(".xls") > 0)
 38                         workbook = new HSSFWorkbook(fs);
 39 
 40                     if (workbook != null)
 41                     {
 42                         sheet = workbook.GetSheetAt(0);//读取第一个sheet,当然也可以循环读取每个sheet
 43                         dataTable = new DataTable();
 44                         if (sheet != null)
 45                         {
 46                             int rowCount = sheet.LastRowNum;//总行数
 47                             if (rowCount > 0)
 48                             {
 49                                 IRow firstRow = sheet.GetRow(0);//第一行
 50                                 int cellCount = firstRow.LastCellNum;//列数
 51 
 52                                 //构建datatable的列
 53                                 if (isColumnName)
 54                                 {
 55                                     startRow = 1;//如果第一行是列名,则从第二行开始读取
 56                                     for (int i = firstRow.FirstCellNum; i < cellCount; ++i)
 57                                     {
 58                                         cell = firstRow.GetCell(i);
 59                                         if (cell != null)
 60                                         {
 61                                             if (cell.StringCellValue != null)
 62                                             {
 63                                                 column = new DataColumn(cell.StringCellValue);
 64                                                 dataTable.Columns.Add(column);
 65                                             }
 66                                         }
 67                                     }
 68                                 }
 69                                 else
 70                                 {
 71                                     for (int i = firstRow.FirstCellNum; i < cellCount; ++i)
 72                                     {
 73                                         column = new DataColumn("column" + (i + 1));
 74                                         dataTable.Columns.Add(column);
 75                                     }
 76                                 }
 77 
 78                                 //填充行
 79                                 for (int i = startRow; i <= rowCount; ++i)
 80                                 {
 81                                     row = sheet.GetRow(i);
 82                                     if (row == null) continue;
 83 
 84                                     dataRow = dataTable.NewRow();
 85                                     for (int j = row.FirstCellNum; j < cellCount; ++j)
 86                                     {
 87                                         cell = row.GetCell(j);                                        
 88                                         if (cell == null)
 89                                         {
 90                                             dataRow[j] = "";
 91                                         }
 92                                         else
 93                                         {
 94                                             //CellType(Unknown = -1,Numeric = 0,String = 1,Formula = 2,Blank = 3,Boolean = 4,Error = 5,)
 95                                             switch (cell.CellType)
 96                                             {
 97                                                 case CellType.Blank:
 98                                                     dataRow[j] = "";
 99                                                     break;
100                                                 case CellType.Numeric:
101                                                     short format = cell.CellStyle.DataFormat;
102                                                     //对时间格式(2015.12.5、2015/12/5、2015-12-5等)的处理
103                                                     if (format == 14 || format == 31 || format == 57 || format == 58)
104                                                         dataRow[j] = cell.DateCellValue;
105                                                     else
106                                                         dataRow[j] = cell.NumericCellValue;
107                                                     break;
108                                                 case CellType.String:
109                                                     dataRow[j] = cell.StringCellValue;
110                                                     break;
111                                             }
112                                         }
113                                     }
114                                     dataTable.Rows.Add(dataRow);
115                                 }
116                             }
117                         }
118                     }
119                 }
120                 return dataTable;
121             }
122             catch (Exception)
123             {
124                 if (fs != null)
125                 {
126                     fs.Close();
127                 }
128                 return null;
129             }
130         }
131     }
132 }

 

三、返回结果

调用上述方法:

private void ReadExcelData()
        {
            DataTable dataTable = null;//接受从excel读取的数据
            string filePath = MapPath("/ExcelFile/excel1.xls");//文件路径姑且写死
            dataTable = ExcelUtility.ExcelToDataTable(filePath, true);
        }

返回的datatable如下:

 

以上就是NPOI读取excel的方法,接下来就可以把datatable插入数据库了,此处省略。

posted @ 2015-12-05 10:47  一夜秋2014  Views(12917)  Comments(0Edit  收藏  举报