C#-利用NOPI处理Excel的代码

using System;
using System.Data;
using System.IO;
using System.Text;
using System.Web;
using NPOI.HPSF;
using NPOI.HSSF.UserModel;
using NPOI.SS.UserModel;

public class ExcelHelper
{
/// <summary>
/// DataTable导出到Excel文件
/// </summary>
/// <param name="dtSource">源DataTable</param>
/// <param name="strHeaderText">表头文本</param>
/// <param name="strFileName">保存位置</param>
/// <param name="strSheetName">工作表名称</param>
/// <Author>柳永法 http://www.yongfa365.com/ 2010-5-8 22:21:41</Author>
public static void Export(DataTable dtSource, string strHeaderText, string strFileName, string strSheetName, string[] oldColumnNames, string[] newColumnNames)
{
if (strSheetName == "")
{
strSheetName = "Sheet";
}
using (MemoryStream ms = Export(dtSource, strHeaderText, strSheetName, oldColumnNames, newColumnNames))
{
using (FileStream fs = new FileStream(strFileName, FileMode.Create, FileAccess.Write))
{
byte[] data = ms.ToArray();
fs.Write(data, 0, data.Length);
fs.Flush();
}
}
}

/// <summary>
/// DataTable导出到Excel的MemoryStream
/// </summary>
/// <param name="dtSource">源DataTable</param>
/// <param name="strHeaderText">表头文本</param>
/// <param name="strSheetName">工作表名称</param>
/// <Author>柳永法 http://www.yongfa365.com/ 2010-5-8 22:21:41</Author>
public static MemoryStream Export(DataTable dtSource, string strHeaderText, string strSheetName, string[] oldColumnNames, string[] newColumnNames)
{
if (oldColumnNames.Length != newColumnNames.Length)
{
return new MemoryStream();
}
HSSFWorkbook workbook = new HSSFWorkbook();
//HSSFSheet sheet = workbook.CreateSheet();// workbook.CreateSheet();
ISheet sheet = workbook.CreateSheet(strSheetName);

#region 右击文件 属性信息
{
DocumentSummaryInformation dsi = PropertySetFactory.CreateDocumentSummaryInformation();
dsi.Company = "http://....../";
workbook.DocumentSummaryInformation = dsi;

SummaryInformation si = PropertySetFactory.CreateSummaryInformation();
if (HttpContext.Current.Session["realname"] != null)
{
si.Author = HttpContext.Current.Session["realname"].ToString();
}
else
{
if (HttpContext.Current.Session["username"] != null)
{
si.Author = HttpContext.Current.Session["username"].ToString();
}
}                                       //填加xls文件作者信息
si.ApplicationName = "NPOI";            //填加xls文件创建程序信息
si.LastAuthor = "OA系统";           //填加xls文件最后保存者信息
si.Comments = "OA系统自动创建文件";      //填加xls文件作者信息
si.Title = strHeaderText;               //填加xls文件标题信息
si.Subject = strHeaderText;              //填加文件主题信息
si.CreateDateTime = DateTime.Now;
workbook.SummaryInformation = si;
}
#endregion

ICellStyle dateStyle = workbook.CreateCellStyle();
IDataFormat format = workbook.CreateDataFormat();
dateStyle.DataFormat = format.GetFormat("yyyy-mm-dd");

#region 取得列宽
int[] arrColWidth = new int[oldColumnNames.Length];
for (int i = 0; i < oldColumnNames.Length; i++)
{
arrColWidth[i] = Encoding.GetEncoding(936).GetBytes(newColumnNames[i]).Length;
}
/*
foreach (DataColumn item in dtSource.Columns)
{
arrColWidth[item.Ordinal] = Encoding.GetEncoding(936).GetBytes(item.ColumnName.ToString()).Length;
}
* */

for (int i = 0; i < dtSource.Rows.Count; i++)
{
for (int j = 0; j < oldColumnNames.Length; j++)
{
int intTemp = Encoding.GetEncoding(936).GetBytes(dtSource.Rows[i][oldColumnNames[j]].ToString()).Length;
if (intTemp > arrColWidth[j])
{
arrColWidth[j] = intTemp;
}
}
/*
for (int j = 0; j < dtSource.Columns.Count; j++)
{
int intTemp = Encoding.GetEncoding(936).GetBytes(dtSource.Rows[i][j].ToString()).Length;
if (intTemp > arrColWidth[j])
{
arrColWidth[j] = intTemp;
}
}
* */
}
#endregion
int rowIndex = 0;

foreach (DataRow row in dtSource.Rows)
{
#region 新建表，填充表头，填充列头，样式
if (rowIndex == 65535 || rowIndex == 0)
{
if (rowIndex != 0)
{
sheet = workbook.CreateSheet(strSheetName + ((int)rowIndex/65535).ToString());
}

#region 表头及样式
{
IRow headerRow = sheet.CreateRow(0);
headerRow.HeightInPoints = 25;
headerRow.CreateCell(0).SetCellValue(strHeaderText);

ICellStyle headStyle = workbook.CreateCellStyle();
headStyle.Alignment = HorizontalAlignment.CENTER;
IFont font = workbook.CreateFont();
font.FontHeightInPoints = 20;
font.Boldweight = 700;
headStyle.SetFont(font);

headerRow.GetCell(0).CellStyle = headStyle;
//sheet.AddMergedRegion(new Region(0, 0, 0, dtSource.Columns.Count - 1));
sheet.AddMergedRegion(new NPOI.SS.Util.CellRangeAddress(0, 0, 0, dtSource.Columns.Count - 1));
}
#endregion

#region 列头及样式
{
//HSSFRow headerRow = sheet.CreateRow(1);
IRow headerRow = sheet.CreateRow(1);

ICellStyle headStyle = workbook.CreateCellStyle();
headStyle.Alignment = HorizontalAlignment.CENTER;
IFont font = workbook.CreateFont();
font.FontHeightInPoints = 10;
font.Boldweight = 700;
headStyle.SetFont(font);

for (int i = 0; i < oldColumnNames.Length; i++)
{
headerRow.CreateCell(i).SetCellValue(newColumnNames[i]);
headerRow.GetCell(i).CellStyle = headStyle;
//设置列宽
sheet.SetColumnWidth(i, (arrColWidth[i] + 1) * 256);
}
/*
foreach (DataColumn column in dtSource.Columns)
{
headerRow.CreateCell(column.Ordinal).SetCellValue(column.ColumnName);
headerRow.GetCell(column.Ordinal).CellStyle = headStyle;

//设置列宽
sheet.SetColumnWidth(column.Ordinal, (arrColWidth[column.Ordinal] + 1) * 256);
}
* */
}
#endregion

rowIndex = 2;
}
#endregion

#region 填充内容
IRow dataRow = sheet.CreateRow(rowIndex);
//foreach (DataColumn column in dtSource.Columns)
for(int i=0;i<oldColumnNames.Length;i++)
{
ICell newCell = dataRow.CreateCell(i);

string drValue = row[oldColumnNames[i]].ToString();

switch (dtSource.Columns[oldColumnNames[i]].DataType.ToString())
{
case "System.String"://字符串类型
newCell.SetCellValue(drValue);
break;
case "System.DateTime"://日期类型
DateTime dateV;
DateTime.TryParse(drValue, out dateV);
newCell.SetCellValue(dateV);

newCell.CellStyle = dateStyle;//格式化显示
break;
case "System.Boolean"://布尔型
bool boolV = false;
bool.TryParse(drValue, out boolV);
newCell.SetCellValue(boolV);
break;
case "System.Int16"://整型
case "System.Int32":
case "System.Int64":
case "System.Byte":
int intV = 0;
int.TryParse(drValue, out intV);
newCell.SetCellValue(intV);
break;
case "System.Decimal"://浮点型
case "System.Double":
double doubV = 0;
double.TryParse(drValue, out doubV);
newCell.SetCellValue(doubV);
break;
case "System.DBNull"://空值处理
newCell.SetCellValue("");
break;
default:
newCell.SetCellValue("");
break;
}

}
#endregion

rowIndex++;
}

using (MemoryStream ms = new MemoryStream())
{
workbook.Write(ms);
ms.Flush();
ms.Position = 0;

//sheet.Dispose();
sheet = null;
workbook = null;
//workbook.Dispose();//一般只用写这一个就OK了，他会遍历并释放所有资源，但当前版本有问题所以只释放sheet
return ms;
}
}

/// <summary>
/// WEB导出DataTable到Excel
/// </summary>
/// <param name="dtSource">源DataTable</param>
/// <param name="strHeaderText">表头文本</param>
/// <param name="strFileName">文件名</param>
/// <Author>柳永法 http://www.yongfa365.com/ 2010-5-8 22:21:41</Author>
public static void ExportByWeb(DataTable dtSource, string strHeaderText, string strFileName)
{
ExportByWeb(dtSource, strHeaderText, strFileName, "sheet");
}

/// <summary>
/// WEB导出DataTable到Excel
/// </summary>
/// <param name="dtSource">源DataTable</param>
/// <param name="strHeaderText">表头文本</param>
/// <param name="strFileName">输出文件名，包含扩展名</param>
/// <param name="oldColumnNames">要导出的DataTable列数组</param>
/// <param name="newColumnNames">导出后的对应列名</param>
public static void ExportByWeb(DataTable dtSource, string strHeaderText, string strFileName, string[] oldColumnNames, string[] newColumnNames)
{
ExportByWeb(dtSource, strHeaderText, strFileName, "sheet",oldColumnNames,newColumnNames);
}

/// <summary>
/// WEB导出DataTable到Excel
/// </summary>
/// <param name="dtSource">源DataTable</param>
/// <param name="strHeaderText">表头文本</param>
/// <param name="strFileName">输出文件名</param>
/// <param name="strSheetName">工作表名称</param>
public static void ExportByWeb(DataTable dtSource, string strHeaderText, string strFileName, string strSheetName)
{
HttpContext curContext = HttpContext.Current;

// 设置编码和附件格式
curContext.Response.ContentType = "application/vnd.ms-excel";
curContext.Response.ContentEncoding = Encoding.UTF8;
curContext.Response.Charset = "";
curContext.Response.AppendHeader("Content-Disposition",
"attachment;filename=" + HttpUtility.UrlEncode(strFileName, Encoding.UTF8));

//生成列
string columns = "";
for (int i = 0; i < dtSource.Columns.Count; i++)
{
if (i > 0)
{
columns += ",";
}
columns += dtSource.Columns[i].ColumnName;
}

curContext.Response.BinaryWrite(Export(dtSource, strHeaderText,strSheetName,columns.Split(','),columns.Split(',')).GetBuffer());
curContext.Response.End();

}

/// <summary>
/// 导出DataTable到Excel
/// </summary>
/// <param name="dtSource">要导出的DataTable</param>
/// <param name="strHeaderText">标题文字</param>
/// <param name="strFileName">文件名，包含扩展名</param>
/// <param name="strSheetName">工作表名</param>
/// <param name="oldColumnNames">要导出的DataTable列数组</param>
/// <param name="newColumnNames">导出后的对应列名</param>
public static void ExportByWeb(DataTable dtSource, string strHeaderText, string strFileName, string strSheetName, string[] oldColumnNames, string[] newColumnNames)
{
HttpContext curContext = HttpContext.Current;

// 设置编码和附件格式
curContext.Response.ContentType = "application/vnd.ms-excel";
curContext.Response.ContentEncoding = Encoding.UTF8;
curContext.Response.Charset = "";
curContext.Response.AppendHeader("Content-Disposition",
"attachment;filename=" + HttpUtility.UrlEncode(strFileName, Encoding.UTF8));

curContext.Response.BinaryWrite(Export(dtSource, strHeaderText, strSheetName,oldColumnNames,newColumnNames).GetBuffer());
curContext.Response.End();
}

/// <summary>读取excel
/// 默认第一行为表头，导入第一个工作表
/// </summary>
/// <param name="strFileName">excel文档路径</param>
/// <returns></returns>
public static DataTable Import(string strFileName)
{
DataTable dt = new DataTable();

HSSFWorkbook hssfworkbook;
using (FileStream file = new FileStream(strFileName, FileMode.Open, FileAccess.Read))
{
hssfworkbook = new HSSFWorkbook(file);
}
ISheet sheet = hssfworkbook.GetSheetAt(0);
System.Collections.IEnumerator rows = sheet.GetRowEnumerator();

IRow headerRow = sheet.GetRow(0);
int cellCount = headerRow.LastCellNum;

for (int j = 0; j < cellCount; j++)
{
ICell cell = headerRow.GetCell(j);
dt.Columns.Add(cell.ToString());
}

for (int i = (sheet.FirstRowNum + 1); i <= sheet.LastRowNum; i++)
{
IRow row = sheet.GetRow(i);
DataRow dataRow = dt.NewRow();

for (int j = row.FirstCellNum; j < cellCount; j++)
{
if (row.GetCell(j) != null)
dataRow[j] = row.GetCell(j).ToString();
}
dt.Rows.Add(dataRow);
}
return dt;
}
/// <summary>
/// 从Excel中获取数据到DataTable
/// </summary>
/// <param name="strFileName">Excel文件全路径(服务器路径)</param>
/// <param name="SheetName">要获取数据的工作表名称</param>
/// <param name="HeaderRowIndex">工作表标题行所在行号(从0开始)</param>
/// <returns></returns>
public static DataTable RenderDataTableFromExcel(string strFileName, string SheetName, int HeaderRowIndex)
{
using (FileStream file = new FileStream(strFileName, FileMode.Open, FileAccess.Read))
{
IWorkbook workbook = new HSSFWorkbook(file);
return RenderDataTableFromExcel(workbook, SheetName, HeaderRowIndex);
}
}

/// <summary>
/// 从Excel中获取数据到DataTable
/// </summary>
/// <param name="strFileName">Excel文件全路径(服务器路径)</param>
/// <param name="SheetIndex">要获取数据的工作表序号(从0开始)</param>
/// <param name="HeaderRowIndex">工作表标题行所在行号(从0开始)</param>
/// <returns></returns>
public static DataTable RenderDataTableFromExcel(string strFileName, int SheetIndex, int HeaderRowIndex)
{
using (FileStream file = new FileStream(strFileName, FileMode.Open, FileAccess.Read))
{
IWorkbook workbook = new HSSFWorkbook(file);
string SheetName = workbook.GetSheetName(SheetIndex);
return RenderDataTableFromExcel(workbook, SheetName, HeaderRowIndex);
}
}

/// <summary>
/// 从Excel中获取数据到DataTable
/// </summary>
/// <param name="ExcelFileStream">Excel文件流</param>
/// <param name="SheetName">要获取数据的工作表名称</param>
/// <param name="HeaderRowIndex">工作表标题行所在行号(从0开始)</param>
/// <returns></returns>
public static DataTable RenderDataTableFromExcel(Stream ExcelFileStream, string SheetName, int HeaderRowIndex)
{
IWorkbook workbook = new HSSFWorkbook(ExcelFileStream);
ExcelFileStream.Close();
return RenderDataTableFromExcel(workbook, SheetName, HeaderRowIndex);
}

/// <summary>
/// 从Excel中获取数据到DataTable
/// </summary>
/// <param name="ExcelFileStream">Excel文件流</param>
/// <param name="SheetIndex">要获取数据的工作表序号(从0开始)</param>
/// <param name="HeaderRowIndex">工作表标题行所在行号(从0开始)</param>
/// <returns></returns>
public static DataTable RenderDataTableFromExcel(Stream ExcelFileStream, int SheetIndex, int HeaderRowIndex)
{
IWorkbook workbook = new HSSFWorkbook(ExcelFileStream);
ExcelFileStream.Close();
string SheetName = workbook.GetSheetName(SheetIndex);
return RenderDataTableFromExcel(workbook, SheetName, HeaderRowIndex);
}

/// <summary>
/// 从Excel中获取数据到DataTable
/// </summary>
/// <param name="workbook">要处理的工作薄</param>
/// <param name="SheetName">要获取数据的工作表名称</param>
/// <param name="HeaderRowIndex">工作表标题行所在行号(从0开始)</param>
/// <returns></returns>
public static DataTable RenderDataTableFromExcel(IWorkbook workbook, string SheetName, int HeaderRowIndex)
{
ISheet sheet = workbook.GetSheet(SheetName);
DataTable table = new DataTable();
try
{
IRow headerRow = sheet.GetRow(HeaderRowIndex);
int cellCount = headerRow.LastCellNum;

for (int i = headerRow.FirstCellNum; i < cellCount; i++)
{
DataColumn column = new DataColumn(headerRow.GetCell(i).StringCellValue);
table.Columns.Add(column);
}

int rowCount = sheet.LastRowNum;

#region 循环各行各列,写入数据到DataTable
for (int i = (sheet.FirstRowNum + 1); i < sheet.LastRowNum; i++)
{
IRow row = sheet.GetRow(i);
DataRow dataRow = table.NewRow();
for (int j = row.FirstCellNum; j < cellCount; j++)
{
ICell cell = row.GetCell(j);
if (cell == null)
{
dataRow[j] = null;
}
else
{
//dataRow[j] = cell.ToString();
switch (cell.CellType)
{
case CellType.BLANK:
dataRow[j] = null;
break;
case CellType.BOOLEAN:
dataRow[j] = cell.BooleanCellValue;
break;
case CellType.NUMERIC:
dataRow[j] = cell.ToString();
break;
case CellType.STRING:
dataRow[j] = cell.StringCellValue;
break;
case CellType.ERROR:
dataRow[j] = cell.ErrorCellValue;
break;
case CellType.FORMULA:
default:
dataRow[j] = "=" + cell.CellFormula;
break;
}
}
}
table.Rows.Add(dataRow);
//dataRow[j] = row.GetCell(j).ToString();
}
#endregion
}
catch (System.Exception ex)
{
table.Clear();
table.Columns.Clear();
table.Columns.Add("出错了");
DataRow dr = table.NewRow();
dr[0] = ex.Message;
table.Rows.Add(dr);
return table;
}
finally
{
//sheet.Dispose();
workbook = null;
sheet = null;
}
#region 清除最后的空行
for (int i = table.Rows.Count - 1; i > 0; i--)
{
bool isnull = true;
for (int j = 0; j < table.Columns.Count; j++)
{
if (table.Rows[i][j] != null)
{
if (table.Rows[i][j].ToString() != "")
{
isnull = false;
break;
}
}
}
if (isnull)
{
table.Rows[i].Delete();
}
}
#endregion
return table;
}
}