前言：
NPOI 技术在别人看来可能有点老生长谈了，但是对于我现在处于的这个创业型公司，还是挺前沿的，不知道是前辈们不知道这个技术，还是懒得去对现有的软件进行修改，因为在现有的软件中，几乎所有的数据导入导出都是依赖于：
Excel.Application（设置excel组件，系统权限，然后还得考虑版本一系列的问题）都是坑
基于现有的方法，之前的技术团队在软件没有推广之前可能自我感觉良好，没有进行一些系统性的测试，在加上一些别的因素吧，导致在工程文件中对 Excel.Application 的操作方法，操作类层出不穷，算了，不揭短了。
有的时候向领导提出想对项目框架优化，或者对代码的优化有所动作的时候，总会有层出不穷的原因导致这个动作渐渐的滞后。这只是一个点，可想而知在没有一个真正的技术经理参与的项目中，没有对框架优化，方法重构的发起人，本来不是很复杂的项目，代码的臃肿，堪忧。
算了，不吐槽了，可能是好久没有写博的原因。
数据输出方法：
/// <summary>
/// 携带数据导出
/// </summary>
/// <param name="dtSource"></param>
/// <param name="_excelName"></param>
/// <param name="str_fieldtext"></param>
public void export(DataTable dtSource, string _excelName, string str_fieldtext)
{
HttpContext curContext = HttpContext.Current;
// 设置编码和附件格式
curContext.Response.ContentType = "application/ms-excel";
curContext.Response.ContentEncoding = Encoding.UTF8;
curContext.Response.Charset = "";
string fileName = _excelName + DateTime.Now.ToString("yyyyMMddHHmmss") + ".xls"; //Excel文件名称
curContext.Response.AppendHeader("Content-Disposition",
"attachment;filename=" + HttpUtility.UrlEncode(fileName, Encoding.UTF8));
//调用导出具体方法Export()
curContext.Response.BinaryWrite(Export(dtSource, _excelName, str_fieldtext).GetBuffer());
curContext.Response.End();
}
导出方法：
#region DataTable导出到Excel
/// <summary>
/// DataTable导出到Excel的MemoryStream Export()
/// </summary>
/// <param name="dtSource">DataTable数据源</param>
/// <param name="strHeaderText">Excel表头文本</param>
/// <param name="str_fieldtext"></param>
public static MemoryStream Export(DataTable dtSource, string strHeaderText, string str_fieldtext)
{
HSSFWorkbook workbook = new HSSFWorkbook();
ISheet sheet = workbook.CreateSheet("Data");
ISheet sheet2 = workbook.CreateSheet("ShtDictionary");
//sheet.DisplayGridlines = false;//隐藏网格线
#region 右击文件 属性信息
{
DocumentSummaryInformation dsi = PropertySetFactory.CreateDocumentSummaryInformation();
dsi.Company = "NPOI";
workbook.DocumentSummaryInformation = dsi;
SummaryInformation si = PropertySetFactory.CreateSummaryInformation();
si.Author = "文件作者信息"; //填加xls文件作者信息
si.ApplicationName = "创建程序信息"; //填加xls文件创建程序信息
si.LastAuthor = "最后保存者信息"; //填加xls文件最后保存者信息
si.Comments = "作者信息"; //填加xls文件作者信息
si.Title = "标题信息"; //填加xls文件标题信息
si.Subject = "主题信息";//填加文件主题信息
si.CreateDateTime = System.DateTime.Now;
workbook.SummaryInformation = si;
}
#endregion
ICellStyle dateStyle = workbook.CreateCellStyle();
IDataFormat format = workbook.CreateDataFormat();
dateStyle.DataFormat = format.GetFormat("yyyy-mm-dd");
//取得列宽
int[] arrColWidth = new int[dtSource.Columns.Count];
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 < dtSource.Columns.Count; j++)
{
int intTemp = Encoding.GetEncoding(936).GetBytes(dtSource.Rows[i][j].ToString()).Length;
if (intTemp > arrColWidth[j])
{
arrColWidth[j] = intTemp;
}
}
}
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();
}
#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 NPOI.SS.Util.CellRangeAddress(0, 0, 0, dtSource.Columns.Count - 1));
}
#endregion
#region 列头及样式
{
IRow headerRow = sheet.CreateRow(0);
ICellStyle headStyle = workbook.CreateCellStyle();
headStyle.Alignment = HorizontalAlignment.Center;
IFont font = workbook.CreateFont();
font.FontHeightInPoints = 10;
font.Boldweight = 700;
headStyle.SetFont(font);
headStyle.FillPattern = FillPattern.SolidForeground;
headStyle.FillForegroundColor = NPOI.HSSF.Util.HSSFColor.Yellow.Index2;//单元格背景色
HSSFPatriarch patr = sheet.CreateDrawingPatriarch() as HSSFPatriarch;
HSSFClientAnchor a = new HSSFClientAnchor();
a.Dx1 = 0;
a.Dy1 = 0;
a.Dx2 = 0;
a.Dy2 = 0;
int colindex = 27;
string[] str_text = { };
if (str_fieldtext.Length > 0)
{
str_text = str_fieldtext.Split(‘,‘);
}
foreach (DataColumn column in dtSource.Columns)
{
a.Col1 = column.Ordinal + 1;//批注起始位置的纵坐标（当前单元格位置+2）
a.Col2 = column.Ordinal + 3;//批注结束位置的纵坐标
a.Row1 = column.Ordinal + 0;//批注起始位置的横坐标
a.Row2 = column.Ordinal + 4;//批注结束位置的横坐标
HSSFComment co = patr.CreateComment(a);//实例化批注模型
co.String = new HSSFRichTextString(Convert.ToString(column.ColumnName));//批注内容
co.Author = "大通软件";//批注者
if (str_text.Length > 0)
headerRow.CreateCell(column.Ordinal).SetCellValue(str_text[column.Ordinal]);//添加单元格内容
else
headerRow.CreateCell(column.Ordinal).SetCellValue(column.ColumnName);//添加单元格内容
headerRow.GetCell(column.Ordinal).CellComment = co;//在该单元格是那个添加批注
headerRow.GetCell(column.Ordinal).CellStyle = headStyle;//给该单元格添加样式
sheet.SetColumnWidth(column.Ordinal, (arrColWidth[column.Ordinal] + 1) * 256);//设置列宽
#region 冻结
///下面对CreateFreezePane的参数作一下说明：
///第一个参数表示要冻结的列数；
///第二个参数表示要冻结的行数，这里只冻结列所以为0；
///第三个参数表示右边区域可见的首列序号，从1开始计算；
///第四个参数表示下边区域可见的首行序号，也是从1开始计算，这里是冻结列，所以为0；
//sheet.CreateFreezePane(1, 0, 1, 0);//冻结首列
sheet.CreateFreezePane(0, 1, 0, 1);//冻结首行
#endregion
#region 下拉
//if (column.Ordinal == 0)
//{
// sheet2.CreateRow(0).CreateCell(0).SetCellValue("itemA");
// sheet2.CreateRow(1).CreateCell(0).SetCellValue("itemB");
// sheet2.CreateRow(2).CreateCell(0).SetCellValue("itemC");
//}
//else
//{
// sheet2.GetRow(0).CreateCell(column.Ordinal).SetCellValue("itemA" + column.Ordinal + "");
// sheet2.GetRow(1).CreateCell(column.Ordinal).SetCellValue("itemB" + column.Ordinal + "");
// sheet2.GetRow(2).CreateCell(column.Ordinal).SetCellValue("itemC" + column.Ordinal + "");
//}
//string colname = string.Empty;
//int remainder = 0;
//remainder = colindex % 26;
//if (remainder == 0) remainder = 26;
//colname = Convert.ToString((char)(remainder + 64));
//IName range = workbook.CreateName();
//range.RefersToFormula = string.Format("{0}!$" + colname + "$1:$" + colname + "${1}", "ShtDictionary", 3);
//range.NameName = "dicRange" + column.Ordinal + "";
//ISheet sheet1 = workbook.GetSheet("Data");
////碰对了，第四个参数确定每次的下拉放到哪个column.Ordinal列，因缺思停
//CellRangeAddressList regions = new CellRangeAddressList(0, 65535, 0, column.Ordinal);
//DVConstraint constraint = DVConstraint.CreateFormulaListConstraint("dicRange" + column.Ordinal + "");
//HSSFDataValidation dataValidate = new HSSFDataValidation(regions, constraint);
//sheet1.AddValidationData(dataValidate);
//colindex++;
#endregion
}
}
#endregion
rowIndex = 1;
}
#endregion
#region 填充内容
IRow dataRow = sheet.CreateRow(rowIndex);
foreach (DataColumn column in dtSource.Columns)
{
ICell newCell = dataRow.CreateCell(column.Ordinal);
string drValue = row[column].ToString();
switch (column.DataType.ToString())
{
case "System.String"://字符串类型
newCell.SetCellValue(drValue);
break;
case "System.DateTime"://日期类型
System.DateTime dateV;
System.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;
return ms;
}
}
#endregion
读取excel 数据：
/// <summary>
/// 读取excel ,默认第一行为标头(获取DataTable)
/// </summary>
/// <param name="strFileName">excel文档路径</param>
/// <returns></returns>
public 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)
{
if (row.GetCell(j).ToString().Contains(‘/‘))
{
string[] a = row.GetCell(j).ToString().Split(‘/‘);
dataRow[j] = "20" + a[2] + "-" + a[0] + "-" + a[1];
}
else
{
dataRow[j] = row.GetCell(j).ToString();
}
}
else
{
dataRow[j] = null;
}
}
dt.Rows.Add(dataRow);
}
return dt;
}
换一种方式：
/// <summary>
/// 导出excel 模板
/// </summary>
/// <param name="str_fieldid"></param>
/// <param name="str_fieldtext"></param>
/// <returns></returns>
public void export(string _excelName, string str_fieldid, string str_fieldtext)
{
HSSFWorkbook workbook = new HSSFWorkbook();
ISheet sheet = workbook.CreateSheet("Data");
#region 右击文件 属性信息
{
DocumentSummaryInformation dsi = PropertySetFactory.CreateDocumentSummaryInformation();
dsi.Company = "NPOI";
workbook.DocumentSummaryInformation = dsi;
SummaryInformation si = PropertySetFactory.CreateSummaryInformation();
si.Author = "文件作者信息"; //填加xls文件作者信息
si.ApplicationName = "创建程序信息"; //填加xls文件创建程序信息
si.LastAuthor = "最后保存者信息"; //填加xls文件最后保存者信息
si.Comments = "作者信息"; //填加xls文件作者信息
si.Title = "标题信息"; //填加xls文件标题信息
si.Subject = "主题信息";//填加文件主题信息
si.CreateDateTime = System.DateTime.Now;
workbook.SummaryInformation = si;
}
#endregion
ICellStyle dateStyle = workbook.CreateCellStyle();
IDataFormat format = 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 == 65535 || rowIndex == 0)
{
if (rowIndex != 0)
{
sheet = workbook.CreateSheet();
}
#region 列头及样式
{
IRow headerRow = sheet.CreateRow(0);
ICellStyle headStyle = workbook.CreateCellStyle();
headStyle.Alignment = HorizontalAlignment.Center;
IFont font = workbook.CreateFont();
font.FontHeightInPoints = 10;
font.Boldweight = 700;
headStyle.SetFont(font);
headStyle.FillPattern = FillPattern.SolidForeground;
headStyle.FillForegroundColor = NPOI.HSSF.Util.HSSFColor.Yellow.Index2;//单元格背景色
HSSFPatriarch patr = sheet.CreateDrawingPatriarch() as HSSFPatriarch;
HSSFClientAnchor a = new HSSFClientAnchor();
a.Dx1 = 0;
a.Dy1 = 0;
a.Dx2 = 0;
a.Dy2 = 0;
string[] str_text = { };
string[] str_field = { };
if (str_fieldtext.Length > 0)
{
str_text = str_fieldtext.Split(‘,‘);
}
if (str_fieldid.Length > 0)
{
str_field = str_fieldid.Split(‘,‘);
}
//取得列宽
int[] arrColWidth = new int[str_text.Length];
for (int i = 0; i < str_text.Length; i++)
{
a.Col1 = i + 1;//批注起始位置的纵坐标（当前单元格位置+2）
a.Col2 = i + 3;//批注结束位置的纵坐标
a.Row1 = i + 0;//批注起始位置的横坐标
a.Row2 = i + 4;//批注结束位置的横坐标
HSSFComment co = patr.CreateComment(a);//实例化批注模型
co.String = new HSSFRichTextString(Convert.ToString(str_field[i]));//批注内容
co.Author = "大通软件";//批注者
if (str_text.Length > 0)
headerRow.CreateCell(i).SetCellValue(str_text[i]);//添加单元格内容
else
headerRow.CreateCell(i).SetCellValue(str_field[i]);//添加单元格内容
headerRow.GetCell(i).CellComment = co;//在该单元格是那个添加批注
headerRow.GetCell(i).CellStyle = headStyle;//给该单元格添加样式
sheet.SetColumnWidth(i, 20 * 256);//设置列宽
//sheet.SetColumnWidth(i, 250);
#region 冻结
sheet.CreateFreezePane(0, 1, 0, 1);//冻结首行
#endregion
}
}
#endregion
rowIndex = 1;
}
#endregion
using (MemoryStream ms = new MemoryStream())
{
workbook.Write(ms);
ms.Flush();
ms.Position = 0;
ExportOut(ms, _excelName);
}
}
/// <summary>
/// 输出方法
/// </summary>
/// <param name="ms"></param>
/// <param name="_excelName"></param>
public void ExportOut(MemoryStream ms, string _excelName)
{
HttpContext curContext = HttpContext.Current;
// 设置编码和附件格式
curContext.Response.ContentType = "application/ms-excel";
curContext.Response.ContentEncoding = Encoding.UTF8;
curContext.Response.Charset = "";
string fileName = _excelName + DateTime.Now.ToString("yyyyMMddHHmmss") + ".xls"; //Excel文件名称
curContext.Response.AppendHeader("Content-Disposition",
"attachment;filename=" + HttpUtility.UrlEncode(fileName, Encoding.UTF8));
//调用导出具体方法Export()
curContext.Response.BinaryWrite(ms.GetBuffer());
curContext.Response.End();
}
NPOI组件: http://files.cnblogs.com/files/houlin/NPOI.zip
后言：
以上就是一些方法来自园子里好多前辈的博文，我自己没有做什么优化，目前只做记录，备忘，不喜勿喷。
时间： 2024-10-11 00:21:27