标签:使用npoi导入导出标准excel npoi 导入导出标准excel 使用npoi导入导出
尝试过很多Excel导入导出方法,都不太理想,无意中逛到oschina时,发现了NPOI,无需Office COM组件且不依赖Office,顿时惊为天人,怀着无比激动的心情写下此文。
NPOI是POI项目的.NET版本,是由@Tony Qu(http://tonyqus.cnblogs.com/)等大侠基于POI开发的,可以从http://npoi.codeplex.com/下载到它的最新版本。它不使用Office COM组件(Microsoft.Office.Interop.XXX.dll),不需要安装Microsoft Office,支持对Office 97-2003的文件格式,功能比较强大。更详细的说明请看作者的博客或官方网站。
它的以下一些特性让我相当喜欢:
本文使用的是它当前的最新版本1.2.4,此版本的程序集缩减至2个:NPOI.dll、Ionic.Zip.dll,直接引用到项目中即可。
对于我们开发者使用的对象主要位于NPOI.HSSF.UserModel空间下,主要有HSSFWorkbook、HSSFSheet、HSSFRow、HSSFCell,对应的接口为位于NPOI.SS.UserModel空间下的IWorkbook、ISheet、IRow、ICell,分别对应Excel文件、工作表、行、列。
简单演示一下创建一个Workbook对象,添加一个工作表,在工作表中添加一行一列:
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using NPOI.HSSF.UserModel;using NPOI.SS.UserModel;public class NPOIWrite{ void CreateSheet() { IWorkbook
workbook = new HSSFWorkbook();//创建Workbook对象 ISheet
sheet = workbook.CreateSheet("Sheet1");//创建工作表 IRow
row = sheet.CreateRow(0);//在工作表中添加一行 ICell
cell = row.CreateCell(0);//在行中添加一列 cell.SetCellValue("test");//设置列的内容 }} |
相应的读取代码:
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using System.IO;using NPOI.HSSF.UserModel;using NPOI.SS.UserModel;public class NPOIRead{ void GetSheet(Stream
stream) { IWorkbook
workbook = new HSSFWorkbook(stream);//从流内容创建Workbook对象 ISheet
sheet = workbook.GetSheetAt(0);//获取第一个工作表 IRow
row = sheet.GetRow(0);//获取工作表第一行 ICell
cell = row.GetCell(0);//获取行的第一列 string value
= cell.ToString();//获取列的值 }} |
从DataTable读取内容来创建Workbook对象:
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public static MemoryStream
RenderToExcel(DataTable table){ MemoryStream
ms = new MemoryStream(); using (table) { using (IWorkbook
workbook = new HSSFWorkbook()) { using (ISheet
sheet = workbook.CreateSheet()) { IRow
headerRow = sheet.CreateRow(0); //
handling header. foreach (DataColumn
column in table.Columns) headerRow.CreateCell(column.Ordinal).SetCellValue(column.Caption);//If
Caption not set, returns the ColumnName value //
handling value. int rowIndex
= 1; foreach (DataRow
row in table.Rows) { IRow
dataRow = sheet.CreateRow(rowIndex); foreach (DataColumn
column in table.Columns) { dataRow.CreateCell(column.Ordinal).SetCellValue(row[column].ToString()); } rowIndex++; } workbook.Write(ms); ms.Flush(); ms.Position
= 0; } } } return ms;} |
如果看不惯DataTable,那么DataReader也行:
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public static MemoryStream
RenderToExcel(IDataReader reader){ MemoryStream
ms = new MemoryStream(); using (reader) { using (IWorkbook
workbook = new HSSFWorkbook()) { using (ISheet
sheet = workbook.CreateSheet()) { IRow
headerRow = sheet.CreateRow(0); int cellCount
= reader.FieldCount; //
handling header. for (int i
= 0; i < cellCount; i++) { headerRow.CreateCell(i).SetCellValue(reader.GetName(i)); } //
handling value. int rowIndex
= 1; while (reader.Read()) { IRow
dataRow = sheet.CreateRow(rowIndex); for (int i
= 0; i < cellCount; i++) { dataRow.CreateCell(i).SetCellValue(reader[i].ToString()); } rowIndex++; } workbook.Write(ms); ms.Flush(); ms.Position
= 0; } } } return ms;} |
以上代码把创建的Workbook对象保存到流中,可以通过以下方法输出到浏览器,或是保存到硬盘中:
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static void SaveToFile(MemoryStream
ms, string fileName){ using (FileStream
fs = new FileStream(fileName,
FileMode.Create, FileAccess.Write)) { byte[]
data = ms.ToArray(); fs.Write(data,
0, data.Length); fs.Flush(); data
= null; }}static void RenderToBrowser(MemoryStream
ms, HttpContext context, string fileName){ if (context.Request.Browser.Browser
== "IE") fileName
= HttpUtility.UrlEncode(fileName); context.Response.AddHeader("Content-Disposition",
"attachment;fileName=" +
fileName); context.Response.BinaryWrite(ms.ToArray());} |
需要注意的是,sheet.LastRowNum = sheet.PhysicalNumberOfRows - 1,这里可能存在BUG:当没有数据或只有一行数据时sheet.LastRowNum为0,PhysicalNumberOfRows 表现正常。
这里读取流中的Excel来创建Workbook对象,并转换成DataTable:
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static DataTable
RenderFromExcel(Stream excelFileStream){ using (excelFileStream) { using (IWorkbook
workbook = new HSSFWorkbook(excelFileStream)) { using (ISheet
sheet = workbook.GetSheetAt(0))//取第一个表 { DataTable
table = new DataTable(); IRow
headerRow = sheet.GetRow(0);//第一行为标题行 int cellCount
= headerRow.LastCellNum;//LastCellNum
= PhysicalNumberOfCells int rowCount
= sheet.LastRowNum;//LastRowNum
= PhysicalNumberOfRows - 1 //handling
header. for (int i
= headerRow.FirstCellNum; i < cellCount; i++) { DataColumn
column = new DataColumn(headerRow.GetCell(i).StringCellValue); table.Columns.Add(column); } for (int i
= (sheet.FirstRowNum + 1); i <= rowCount; i++) { IRow
row = sheet.GetRow(i); DataRow
dataRow = table.NewRow(); if (row
!= null) { for (int j
= row.FirstCellNum; j < cellCount; j++) { if (row.GetCell(j)
!= null) dataRow[j]
= GetCellValue(row.GetCell(j)); } } table.Rows.Add(dataRow); } return table; } } }} |
或者是直接生成SQL语句来插入到数据库:
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public static int RenderToDb(Stream
excelFileStream, string insertSql,
DBAction dbAction){ int rowAffected
= 0; using (excelFileStream) { using (IWorkbook
workbook = new HSSFWorkbook(excelFileStream)) { using (ISheet
sheet = workbook.GetSheetAt(0))//取第一个工作表 { StringBuilder
builder = new StringBuilder(); IRow
headerRow = sheet.GetRow(0);//第一行为标题行 int cellCount
= headerRow.LastCellNum;//LastCellNum
= PhysicalNumberOfCells int rowCount
= sheet.LastRowNum;//LastRowNum
= PhysicalNumberOfRows - 1 for (int i
= (sheet.FirstRowNum + 1); i <= rowCount; i++) { IRow
row = sheet.GetRow(i); if (row
!= null) { builder.Append(insertSql); builder.Append("
values ("); for (int j
= row.FirstCellNum; j < cellCount; j++) { builder.AppendFormat("‘{0}‘,",
GetCellValue(row.GetCell(j)).Replace("‘",
"‘‘")); } builder.Length
= builder.Length - 1; builder.Append(");"); } if ((i
% 50 == 0 || i == rowCount) && builder.Length > 0) { //每50条记录一次批量插入到数据库 rowAffected
+= dbAction(builder.ToString()); builder.Length
= 0; } } } } } return rowAffected;} |
这里的Excel可能没有数据,所以可以加一个方法来检测:
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public static bool HasData(Stream
excelFileStream){ using (excelFileStream) { using (IWorkbook
workbook = new HSSFWorkbook(excelFileStream)) { if (workbook.NumberOfSheets
> 0) { using (ISheet
sheet = workbook.GetSheetAt(0)) { return sheet.PhysicalNumberOfRows
> 0; } } } } return false;} |
好吧,不说啥了,放代码:点击下载
标签:使用npoi导入导出标准excel npoi 导入导出标准excel 使用npoi导入导出
原文地址:http://blog.csdn.net/fuyifang/article/details/41178215