using NPOI.HSSF.UserModel;
using NPOI.SS.UserModel;
using NPOI.XSSF.UserModel;
using System;
using System.Collections.Generic;
using System.Data;
using System.IO;
using System.Linq;
using System.Text;
namespace BLL.Common
{
public class NPOIHelper
{
/// <summary>
/// Excel转换成DataTable（.xls）
/// </summary>
/// <param name="filePath">Excel文件路径</param>
/// <returns></returns>
public static DataTable ExcelToDataTable(string filePath)
{
var dt = new DataTable();
using (var file = new FileStream(filePath, FileMode.Open, FileAccess.Read))
{
var hssfworkbook = new HSSFWorkbook(file);
var sheet = hssfworkbook.GetSheetAt(0);
for (var j = 0; j < 5; j++)
{
dt.Columns.Add(Convert.ToChar(((int)'A') + j).ToString());
}
var rows = sheet.GetRowEnumerator();
while (rows.MoveNext())
{
var row = (HSSFRow)rows.Current;
var dr = dt.NewRow();
for (var i = 0; i < row.LastCellNum; i++)
{
var cell = row.GetCell(i);
if (cell == null)
{
dr[i] = null;
}
else
{
switch (cell.CellType)
{
case CellType.Blank:
dr[i] = "[null]";
break;
case CellType.Boolean:
dr[i] = cell.BooleanCellValue;
break;
case CellType.Numeric:
dr[i] = cell.ToString();
break;
case CellType.String:
dr[i] = cell.StringCellValue;
break;
case CellType.Error:
dr[i] = cell.ErrorCellValue;
break;
case CellType.Formula:
try
{
dr[i] = cell.NumericCellValue;
}
catch
{
dr[i] = cell.StringCellValue;
}
break;
default:
dr[i] = "=" + cell.CellFormula;
break;
}
}
}
dt.Rows.Add(dr);
}
}
return dt;
}
/// <summary>
/// Excel转换成DataSet（.xlsx/.xls）
/// </summary>
/// <param name="filePath">Excel文件路径</param>
/// <param name="strMsg"></param>
/// <param firstTitle="strMsg">第一行是否为表头</param>
/// <returns></returns>
public static DataSet ExcelToDataSet(string filePath, out string strMsg, bool firstTitle = false)
{
strMsg = "";
DataSet ds = new DataSet();
DataTable dt = new DataTable();
string fileType = Path.GetExtension(filePath).ToLower();
string fileName = Path.GetFileName(filePath).ToLower();
try
{
ISheet sheet = null;
int sheetNumber = 0;
FileStream fs = new FileStream(filePath, FileMode.Open, FileAccess.Read);
if (fileType == ".xlsx")
{
// 2007版本
XSSFWorkbook workbook = new XSSFWorkbook(fs);
sheetNumber = workbook.NumberOfSheets;
for (int i = 0; i < sheetNumber; i++)
{
string sheetName = workbook.GetSheetName(i);
sheet = workbook.GetSheet(sheetName);
if (sheet != null)
{
dt = firstTitle ? GetFirstSheetDataTable(sheet, out strMsg) : GetSheetDataTable(sheet, out strMsg);
if (dt != null)
{
dt.TableName = sheetName.Trim();
ds.Tables.Add(dt);
}
else
{
strMsg = "Sheet数据获取失败，原因：" + strMsg;
}
}
}
}
else if (fileType == ".xls")
{
// 2003版本
HSSFWorkbook workbook = new HSSFWorkbook(fs);
sheetNumber = workbook.NumberOfSheets;
for (int i = 0; i < sheetNumber; i++)
{
string sheetName = workbook.GetSheetName(i);
sheet = workbook.GetSheet(sheetName);
if (sheet != null)
{
//dt = GetSheetDataTable(sheet, out strMsg);
dt = firstTitle ? GetFirstSheetDataTable(sheet, out strMsg) : GetSheetDataTable(sheet, out strMsg);
if (dt != null)
{
dt.TableName = sheetName.Trim();
ds.Tables.Add(dt);
}
else
{
strMsg = "Sheet数据获取失败，原因：" + strMsg;
}
}
}
}
return ds;
}
catch (Exception ex)
{
strMsg = ex.Message;
return null;
}
}
/// <summary>
/// 获取sheet表对应的DataTable
/// </summary>
/// <param name="sheet">Excel工作表</param>
/// <param name="strMsg"></param>
/// <returns></returns>
private static DataTable GetSheetDataTable(ISheet sheet, out string strMsg)
{
strMsg = "";
DataTable dt = new DataTable();
string sheetName = sheet.SheetName;
int startIndex = 0;// sheet.FirstRowNum;
int lastIndex = sheet.LastRowNum;
//最大列数
int cellCount = 0;
IRow maxRow = sheet.GetRow(0);
for (int i = startIndex; i <= lastIndex; i++)
{
IRow row = sheet.GetRow(i);
if (row != null && cellCount < row.LastCellNum)
{
cellCount = row.LastCellNum;
maxRow = row;
}
}
//列名设置
try
{
for (int i = 0; i < maxRow.LastCellNum; i++)//maxRow.FirstCellNum
{
dt.Columns.Add(Convert.ToChar(((int)'A') + i).ToString());
//DataColumn column = new DataColumn("Column" + (i + 1).ToString());
//dt.Columns.Add(column);
}
}
catch
{
strMsg = "工作表" + sheetName + "中无数据";
return null;
}
//数据填充
for (int i = startIndex; i <= lastIndex; i++)
{
IRow row = sheet.GetRow(i);
DataRow drNew = dt.NewRow();
if (row != null)
{
for (int j = row.FirstCellNum; j < row.LastCellNum; ++j)
{
if (row.GetCell(j) != null)
{
ICell cell = row.GetCell(j);
switch (cell.CellType)
{
case CellType.Blank:
drNew[j] = "";
break;
case CellType.Numeric:
short format = cell.CellStyle.DataFormat;
//对时间格式（2015.12.5、2015/12/5、2015-12-5等）的处理
if (format == 14 || format == 31 || format == 57 || format == 58)
drNew[j] = cell.DateCellValue;
else
drNew[j] = cell.NumericCellValue;
if (cell.CellStyle.DataFormat == 177 || cell.CellStyle.DataFormat == 178 || cell.CellStyle.DataFormat == 188)
drNew[j] = cell.NumericCellValue.ToString("#0.00");
break;
case CellType.String:
drNew[j] = cell.StringCellValue;
break;
case CellType.Formula:
try
{
drNew[j] = cell.NumericCellValue;
if (cell.CellStyle.DataFormat == 177 || cell.CellStyle.DataFormat == 178 || cell.CellStyle.DataFormat == 188)
drNew[j] = cell.NumericCellValue.ToString("#0.00");
}
catch
{
try
{
drNew[j] = cell.StringCellValue;
}
catch { }
}
break;
default:
drNew[j] = cell.StringCellValue;
break;
}
}
}
}
dt.Rows.Add(drNew);
}
return dt;
}
/// <summary>
/// 默认第一行为表头，获取sheet表对应的DataTable
/// </summary>
/// <param name="sheet">Excel工作表</param>
/// <param name="strMsg"></param>
/// <returns></returns>
private static DataTable GetFirstSheetDataTable(ISheet sheet, out string strMsg)
{
strMsg = string.Empty;
DataTable dt = new DataTable();
FileStream file = null;
try
{
//ISheet sheet = Workbook.GetSheetAt(0);//读取第一个sheet
System.Collections.IEnumerator rows = sheet.GetRowEnumerator();
//得到Excel工作表的行
IRow headerRow = sheet.GetRow(0);
//得到Excel工作表的总列数
int cellCount = headerRow.LastCellNum;
for (int j = 0; j < cellCount; j++)
{
//得到Excel工作表指定行的单元格
ICell cell = headerRow.GetCell(j);
if (cell != null)
{
dt.Columns.Add(cell.ToString().Trim());
}
else
{
dt.Columns.Add(j.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.PhysicalNumberOfCells != 0 && row.GetCell(j) != null)
{
if (row.GetCell(j).CellType == CellType.Numeric && DateUtil.IsCellDateFormatted(row.GetCell(j)))
{
dataRow[j] = row.GetCell(j).DateCellValue;
}
else
{
dataRow[j] = row.GetCell(j).ToString();
}
}
}
dt.Rows.Add(dataRow);
}
return dt;
}
catch (Exception ex)
{
strMsg = ex.Message;
if (file != null)
{
file.Close();//关闭当前流并释放资源
}
return null;
}
}
/// <summary>读取excel 到datatable
/// 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 FirstTitleExcelToDataTable(string strFileName)
{
DataTable dt = new DataTable();
FileStream file = null;
IWorkbook Workbook = null;
try
{
using (file = new FileStream(strFileName, FileMode.Open, FileAccess.Read))//C#文件流读取文件
{
if (strFileName.IndexOf(".xlsx") > 0)
//把xlsx文件中的数据写入Workbook中
Workbook = new XSSFWorkbook(file);
else if (strFileName.IndexOf(".xls") > 0)
//把xls文件中的数据写入Workbook中
Workbook = new HSSFWorkbook(file);
if (Workbook != null)
{
ISheet sheet = Workbook.GetSheetAt(0);//读取第一个sheet
System.Collections.IEnumerator rows = sheet.GetRowEnumerator();
//得到Excel工作表的行
IRow headerRow = sheet.GetRow(0);
//得到Excel工作表的总列数
int cellCount = headerRow.LastCellNum;
for (int j = 0; j < cellCount; j++)
{
//得到Excel工作表指定行的单元格
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;
}
}
catch (Exception)
{
if (file != null)
{
file.Close();//关闭当前流并释放资源
}
return null;
}
}
#region 导出
/// <summary>
/// DataSet导出excel，多个sheet
/// </summary>
/// <param name="ds"></param>
/// <param name="Path"></param>
/// <returns></returns>
public static string DataSetToExcel(DataSet ds, string Path)
{
var result = string.Empty;
FileStream fs = null;
XSSFWorkbook workbook = new XSSFWorkbook();
for (int i = 0; i < ds.Tables.Count; i++)
{
XSSFSheet sheet = (XSSFSheet)workbook.CreateSheet(ds.Tables[i].TableName);
XSSFCellStyle dateStyle = (XSSFCellStyle)workbook.CreateCellStyle();
XSSFDataFormat format = (XSSFDataFormat)workbook.CreateDataFormat();
dateStyle.DataFormat = format.GetFormat("yyyy-mm-dd");
int rowIndex = 0;
#region 新建表，填充表头，填充列头，样式
if (rowIndex == 0)
{
//#region 列头及样式
//{
// XSSFRow headerRow = (XSSFRow)sheet.CreateRow(0);
// XSSFCellStyle headStyle = (XSSFCellStyle)workbook.CreateCellStyle();
// //headStyle.Alignment = CellHorizontalAlignment.CENTER;
// XSSFFont font = (XSSFFont)workbook.CreateFont();
// font.FontHeightInPoints = 10;
// font.Boldweight = 700;
// headStyle.SetFont(font);
//}
//#endregion
//填充表头
XSSFRow dataRow = (XSSFRow)sheet.CreateRow(rowIndex);
foreach (DataColumn column in ds.Tables[i].Columns)
{
dataRow.CreateCell(column.Ordinal).SetCellValue(column.ColumnName);
}
rowIndex = 1;
}
#endregion
foreach (DataRow row in ds.Tables[i].Rows)
{
XSSFRow dataRow = (XSSFRow)sheet.CreateRow(rowIndex);
#region 填充内容
foreach (DataColumn column in ds.Tables[i].Columns)
{
XSSFCell newCell = (XSSFCell)dataRow.CreateCell(column.Ordinal);
string type = row[column].GetType().FullName.ToString();
newCell.SetCellValue(GetValue(row[column].ToString(), type));
}
#endregion
rowIndex++;
}
}
using (fs = File.OpenWrite(Path))
{
workbook.Write(fs);//向打开的这个xls文件中写入数据
result = Path;
}
return result;
}
private static string GetValue(string cellValue, string type)
{
object value = string.Empty;
switch (type)
{
case "System.String"://字符串类型
value = cellValue;
break;
case "System.DateTime"://日期类型
System.DateTime dateV;
System.DateTime.TryParse(cellValue, out dateV);
value = dateV;
break;
case "System.Boolean"://布尔型
bool boolV = false;
bool.TryParse(cellValue, out boolV);
value = boolV;
break;
case "System.Int16"://整型
case "System.Int32":
case "System.Int64":
case "System.Byte":
int intV = 0;
int.TryParse(cellValue, out intV);
value = intV;
break;
case "System.Decimal"://浮点型
case "System.Double":
double doubV = 0;
double.TryParse(cellValue, out doubV);
value = doubV;
break;
case "System.DBNull"://空值处理
value = string.Empty;
break;
default:
value = string.Empty;
break;
}
return value.ToString();
}
#endregion
}
}