NPOI导入导出实例代码

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WinForm导出

private string fileName = null; //文件名
private IWorkbook workbook = null;
private FileStream fs = null;
private bool disposed;

public int DataTableToExcel(DataTable data, string sheetName, bool isColumnWritten)
{
int i = 0;
int j = 0;
int count = 0;
ISheet sheet = null;

fs = new FileStream(fileName, FileMode.OpenOrCreate, FileAccess.ReadWrite);
if (fileName.IndexOf(".xlsx") > 0) // 2007版本
workbook = new XSSFWorkbook();
else if (fileName.IndexOf(".xls") > 0) // 2003版本
workbook = new HSSFWorkbook();

try
{
if (workbook != null)
{
sheet = workbook.CreateSheet(sheetName);
}
else
{
return -1;
}

if (isColumnWritten == true) //写入DataTable的列名
{
IRow row = sheet.CreateRow(0);
for (j = 0; j < data.Columns.Count; ++j)
{
row.CreateCell(j).SetCellValue(data.Columns[j].ColumnName);
}
count = 1;
}
else
{
count = 0;
}

for (i = 0; i < data.Rows.Count; ++i)
{
IRow row = sheet.CreateRow(count);
for (j = 0; j < data.Columns.Count; ++j)
{
row.CreateCell(j).SetCellValue(data.Rows[i][j].ToString());
}
++count;
}
workbook.Write(fs); //写入到excel
return count;
}
catch (Exception ex)
{
Console.WriteLine("Exception: " + ex.Message);
return -1;
}
}

WebFrom导出

public void ExportDataTableToExcel(DataTable sourceTable, string sheetName)
{
try
{
HSSFWorkbook workbook = new HSSFWorkbook();

DocumentSummaryInformation dsi = PropertySetFactory.CreateDocumentSummaryInformation();
dsi.Company = CompanyName;
workbook.DocumentSummaryInformation = dsi;

SummaryInformation si = PropertySetFactory.CreateSummaryInformation();
si.Subject = Subject;
workbook.SummaryInformation = si;

ISheet sheet = workbook.CreateSheet(sheetName);
IRow headerRow = sheet.CreateRow(0);
foreach (DataColumn column in sourceTable.Columns)
headerRow.CreateCell(column.Ordinal).SetCellValue(column.ColumnName);

int rowIndex = 1;
foreach (DataRow row in sourceTable.Rows)
{
IRow dataRow = sheet.CreateRow(rowIndex);
foreach (DataColumn column in sourceTable.Columns)
{
dataRow.CreateCell(column.Ordinal).SetCellValue(row[column].ToString());
}
rowIndex++;
}

string filename = string.Format("{0}{1}.xls", sheetName, DateTime.Now.ToString("yyyyMMddHHmm"));

HttpContext.Current.Response.ContentType = "application/vnd.ms-excel";
HttpContext.Current.Response.Charset = "utf-8";

bool isFireFox = false;
if (HttpContext.Current.Request.ServerVariables["http_user_agent"].ToLower().IndexOf("firefox") != -1)
{
isFireFox = true;
}
if (isFireFox == true)
{
filename = "\"" + filename + "\"";
HttpContext.Current.Response.AppendHeader("Content-Disposition", "attachment;filename=" + filename);
}
else
{
HttpContext.Current.Response.AppendHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode(filename, System.Text.Encoding.UTF8).ToString());
}
HttpContext.Current.Response.ContentEncoding = System.Text.Encoding.UTF8;
HttpContext.Current.Response.Clear();

MemoryStream file = new MemoryStream();
workbook.Write(file);
file.WriteTo(HttpContext.Current.Response.OutputStream);

//HttpContext.Current.Response.End();

workbook = null;
}
catch (Exception ex)
{
HttpContext.Current.Response.Write("<script>alert(‘导出失败："+ex.Message+"‘)</script>");
//workbook = null;
//throw new Exception(string.Format("导出失败,详细：", ex.Message));
}
}

通用导入

public DataTable ImportExcelFile(string filePath, bool isFirstRowColumn)
{
ISheet sheet = null;
DataTable data = new DataTable();
int startRow = 0;

try
{
using (FileStream file = new FileStream(filePath, FileMode.Open, FileAccess.Read))
{
if (filePath.IndexOf(".xlsx") > 0) // 2007版本
workbook = new XSSFWorkbook(file);
else if (filePath.IndexOf(".xls") > 0) // 2003版本
workbook = new HSSFWorkbook(file);
}

sheet = workbook.GetSheetAt(0);

if (sheet != null)
{
IRow firstRow = sheet.GetRow(0);
int cellCount = firstRow.LastCellNum; //一行最后一个cell的编号 即总的列数

if (isFirstRowColumn)
{
for (int i = firstRow.FirstCellNum; i < cellCount; ++i)
{
ICell cell = firstRow.GetCell(i);
if (cell != null)
{
string cellValue = cell.StringCellValue;
if (cellValue != null)
{
DataColumn column = new DataColumn(cellValue);
data.Columns.Add(column);
}
}
}
startRow = sheet.FirstRowNum + 1;
}
else
{
startRow = sheet.FirstRowNum;
}
//最后一列的标号
int rowCount = sheet.LastRowNum;
for (int i = startRow; i <= rowCount; ++i)
{
IRow row = sheet.GetRow(i);
if (row == null) continue; //没有数据的行默认是null　　　　　　　

DataRow dataRow = data.NewRow();
for (int j = row.FirstCellNum; j < cellCount; ++j)
{
if (row.GetCell(j) != null) //同理，没有数据的单元格都默认是null
dataRow[j] = row.GetCell(j).ToString();
}
data.Rows.Add(dataRow);
}
}

return data;

}

catch (Exception e)
{
Html(e.ToString());
throw e;
}

}

NPOI导入导出实例代码

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原文地址：http://www.cnblogs.com/dengyuxuan/p/5666134.html