ASP.NET的网站NPOI转EXCEL，转DataTable
<p> NPOI一直都是ASP.NET网站所使用的DataTable转EXCEL,或者Excel转DataTable </p><p>以下是具体代码，它需要最新版的NPOI动态连接库，</p><p>这个是下载地址</p><p>http://down.51cto.com/data/695728</p>
using System;
using System.Web;
using System.Text;
using System.Data;
using System.IO;
using NPOI.XSSF.UserModel;
using NPOI.SS.UserModel;
namespace Admin.Common
{
public class Common
{
private static Common common = null;
public static Common getInstance()
{
if (common == null)
{
common = new Common();
}
return common;
}
/// 第一种 DataTable 转换成 Excel
/// </summary>
public string WriteToExcel(DataTable dt)
{
//创建保存的路径（每天一个文件夹）
string fn = string.Empty;
string filename = "/TempFiles/" + DateTime.Now.ToString("yyyyMMdd") + "/";
string path = HttpContext.Current.Server.MapPath(filename);
try
{
if (!Directory.Exists(path))
{
Directory.CreateDirectory(path);
}
//删除近10天的文件夹
try
{
for (int i = 20; i > 0; i--)
{
string path2 = HttpContext.Current.Server.MapPath("/TempFiles/" + DateTime.Now.AddDays(-i).ToString("yyyyMMdd") + "/");
if (Directory.Exists(path2))
{
Directory.Delete(path2, true);
}
}
}
catch { }
fn = "ENGUO会员信息_" + DateTime.Now.ToString("yyyy-MM-dd_hh-mm-ss") + ".xls";
path += fn;
//创建工作薄
XSSFWorkbook workbook = new XSSFWorkbook();
//创建sheet表
ISheet sheet = workbook.CreateSheet("sheet1");
//设置单元格宽度
sheet.SetColumnWidth(0, 20 * 256);
sheet.SetColumnWidth(1, 28 * 256);
sheet.SetColumnWidth(2, 28 * 256);
sheet.SetColumnWidth(3, 25 * 256);
//创建列的属性，高为：20*20
IRow headerRow = sheet.CreateRow(0);
headerRow.Height = 20 * 20;
//创建列
foreach (DataColumn column in dt.Columns)
headerRow.CreateCell(column.Ordinal).SetCellValue(column.ColumnName);
//构建表格里的内容
int rowIndex = 1;
foreach (DataRow row in dt.Rows)
{
IRow dataRow = sheet.CreateRow(rowIndex);
foreach (DataColumn column in dt.Columns)
{
dataRow.CreateCell(column.Ordinal).SetCellValue(row[column].ToString());
}
rowIndex++;
}
//使用文件流，写入磁盘
using (FileStream fs = new FileStream(path, FileMode.Create, FileAccess.Write))
{
fs.Flush();
workbook.Write(fs);
}
StreamWriter sw = new StreamWriter(path + "success.log", false, Encoding.UTF8);
sw.Write("下载成功！地址为：" + path + fn);
sw.Flush();
sw.Close();
}
catch (Exception e)
{
StreamWriter sw = new StreamWriter(path + "error.log", false, Encoding.UTF8);
sw.Write("错误信息：" + e.Message + "\r\n 错误跟踪：" + e.StackTrace);
sw.Flush();
sw.Close();
}
//返回文件的磁盘路径
return filename + fn;
}
/// <summary>
/// 第二种 DataTable 转换成 Excel
/// </summary>
public string ExportDataTableToExcel(DataTable dt)
{
//创建工作薄
XSSFWorkbook wb = new XSSFWorkbook();
//创建表
ISheet sh = wb.CreateSheet("人员信息表");
//设置单元格宽度
sh.SetColumnWidth(0, 20 * 256);
sh.SetColumnWidth(1, 28 * 256);
sh.SetColumnWidth(2, 28 * 256);
sh.SetColumnWidth(3, 25 * 256);
IRow row1 = sh.CreateRow(0);
row1.Height = 20 * 20;
ICell icell1top = row1.CreateCell(0);
icell1top.CellStyle = Getcellstyle(wb, stylexls.文本);
icell1top.SetCellValue("一");
ICell icell2top = row1.CreateCell(1);
icell2top.CellStyle = Getcellstyle(wb, stylexls.文本);
icell2top.SetCellValue("二");
ICell icell3top = row1.CreateCell(2);
icell3top.CellStyle = Getcellstyle(wb, stylexls.文本);
icell3top.SetCellValue("三");
ICell icell4top = row1.CreateCell(3);
icell4top.CellStyle = Getcellstyle(wb, stylexls.文本);
icell4top.SetCellValue("TID");
string[] column = { "一", "二", "三", "TID" };
if (dt != null && dt.Rows.Count > 0)
{
string iden = string.Empty;
for (int i = 0; i < dt.Rows.Count; i++)
{
IRow row = sh.CreateRow(i + 1);
row.Height = 20 * 20;
for (int j = 0; j < column.Length; j++)
{
ICell cell = row.CreateCell(j);
cell.CellStyle = Getcellstyle(wb, stylexls.文本);
cell.SetCellValue(dt.Rows[i][column[j]].ToString());
}
}
}
string virtualpath = "/AdminSystem/TempFiles/";
string path = HttpContext.Current.Server.MapPath(virtualpath);
if (!Directory.Exists(path))
{
Directory.CreateDirectory(path);
}
string filename = "表名-" + DateTime.Now.ToString("yyyyMMddhhmmssfffffff") + ".xls";
using (FileStream stm = new FileStream((path + filename), FileMode.Create, FileAccess.Write))
{
stm.Flush();
wb.Write(stm);
}
return virtualpath + filename;
}
#region 定义单元格常用到的样式枚举
private enum stylexls
{
文本,
内容,
时间,
数字,
百分比,
科学计数法,
默认
}
#endregion
#region 定义单元格常用到的样式
private static ICellStyle Getcellstyle(IWorkbook wb, stylexls str)
{
ICellStyle cellStyle = wb.CreateCellStyle();
//定义字体
IFont font12 = wb.CreateFont();
font12.FontHeightInPoints = 12;
font12.FontName = "微软雅黑";
IFont font10 = wb.CreateFont();
font10.FontHeightInPoints = 10;
font10.FontName = "微软雅黑";
IFont font13 = wb.CreateFont();
font13.FontHeightInPoints = 20;
font13.FontName = "微软雅黑";
IFont font = wb.CreateFont();
font.FontName = "微软雅黑";
//定义边框
cellStyle.BorderBottom = NPOI.SS.UserModel.BorderStyle.Thin;
cellStyle.BorderLeft = NPOI.SS.UserModel.BorderStyle.Thin;
cellStyle.BorderTop = NPOI.SS.UserModel.BorderStyle.Thin;
cellStyle.BorderRight = NPOI.SS.UserModel.BorderStyle.Thin;
//背景颜色
cellStyle.FillBackgroundColor = (short)new XSSFColor().Theme;
//水平对齐
cellStyle.Alignment = HorizontalAlignment.Center;
//垂直对齐
cellStyle.VerticalAlignment = VerticalAlignment.Center;
//自动换行
cellStyle.WrapText = true;
switch (str)
{
case stylexls.文本:
cellStyle.SetFont(font12);
break;
case stylexls.内容:
cellStyle.SetFont(font10);
break;
case stylexls.时间:
IDataFormat datastyle = wb.CreateDataFormat();
cellStyle.DataFormat = datastyle.GetFormat("yyyy-MM-dd");
cellStyle.SetFont(font);
break;
case stylexls.默认:
cellStyle.SetFont(font13);
break;
}
return cellStyle;
}
#endregion
}
}