导出帮助类
using NPOI.HSSF.UserModel;
using NPOI.SS.UserModel;
using System;
using System.Collections.Generic;
using System.Data;
using System.IO;
using System.Linq;
using System.Text;
using System.Web;
/// <summary>
/// ExcleHelper 的摘要说明
/// </summary>
public class ExcleHelper
{
public ExcleHelper()
{
//
// TODO: 在此处添加构造函数逻辑
//
}
/// <summary>
/// 文件名称
/// </summary>
public string fileName { get; set; }
/// <summary>
/// sheet,列，数据源
/// </summary>
public List<ExcleSheetColumnData> SheetColumnList { get; set; }
/// <summary>
/// 导出excle
/// </summary>
public string Excle(string fileName, List<ExcleSheetColumnData> SheetColumnList)
{
//设置导出文件路径
string path = HttpContext.Current.Server.MapPath("Export/");
//设置新建文件路径及名称
var newFile = path + fileName + ".xls";
using (var fs = new FileStream(newFile, FileMode.Create, FileAccess.Write))
{
IWorkbook workbook = new HSSFWorkbook();
#region 设置内容单元格样式 (这边的单元格样式一定要放在循环外面，否则会造成office下部分样式丢失，wps下没问题)
var style = (HSSFCellStyle)workbook.CreateCellStyle(); //创建样式
style.Alignment = HorizontalAlignment.Center; //水平居中
style.VerticalAlignment = VerticalAlignment.Center; //垂直居中
style.BorderBottom = BorderStyle.Thin;
style.BorderLeft = BorderStyle.Thin;
style.BorderRight = BorderStyle.Thin;
style.BorderTop = BorderStyle.Thin;
IFont font = workbook.CreateFont();
font.FontHeight = 18 * 18;
style.SetFont(font);
#endregion
foreach (var SheetColumnModel in SheetColumnList)
{
var sheet = workbook.CreateSheet(SheetColumnModel.sheetName);
var ColumnList = SheetColumnModel.ColumnList;
//列头行
var rowColumn = (HSSFRow)sheet.CreateRow(0);
//列头
for (var i = 0; i < ColumnList.Count; i++)
{
var cell = rowColumn.CreateCell(i);
cell.CellStyle = style;
cell.SetCellValue(ColumnList[i].ColumnValue);
sheet.AutoSizeColumn(i);
}
int j = 0;
foreach (DataRow it in SheetColumnModel.DataList.Tables[0].Rows)
{
j++;
var row = sheet.CreateRow(j);
for (var i = 0; i < ColumnList.Count; i++)
{
var cell = row.CreateCell(i);
cell.CellStyle = style;
cell.SetCellValue(it[ColumnList[i].ColumnKey].ToString());
}
}
for (var i = 0; i < ColumnList.Count; i++)
{
SelfWidth(sheet,i);
}
}
workbook.Write(fs);
return newFile;
}
}
/// <summary>
/// 自适应宽度
/// </summary>
/// <param name="sheet"></param>
/// <param name="columnNum"></param>
public void SelfWidth(ISheet sheet, int columnNum)
{
int columnWidth = sheet.GetColumnWidth(columnNum) / 256;//获取当前列宽度
for (int rowNum = 1; rowNum <= sheet.LastRowNum; rowNum++)//在这一 列上循环行
{
IRow currentRow = sheet.GetRow(rowNum);
ICell currentCell = currentRow.GetCell(columnNum);
int length = Encoding.UTF8.GetBytes(currentCell.ToString()).Length;// 获取当前单元格的内容宽度
if (columnWidth < length + 1)
{
columnWidth = length + 1;
}
}
sheet.SetColumnWidth(columnNum, columnWidth * 256);
}
/// <summary>
/// 自适应高度
/// </summary>
/// <param name="sheet"></param>
public void SelfHeight(ISheet sheet)
{
for (int rowNum = 2; rowNum < sheet.LastRowNum; rowNum++)
{
IRow currentRow = sheet.GetRow(rowNum);
ICell currentCell = currentRow.GetCell(4);
ICell currentCell2 = currentRow.GetCell(8);
int length = Encoding.UTF8.GetBytes(currentCell.ToString()).Length;
int length2 = Encoding.UTF8.GetBytes(currentCell2.ToString()).Length;
currentRow.HeightInPoints= length > length2 ? 20 * (length / 60 + 2) : 20 * (length2 / 60 + 2);
}
}
}
/// <summary>
/// 一个sheet和这个sheet的列
/// </summary>
public class ExcleSheetColumnData
{
/// <summary>
/// 展示得sheet
/// </summary>
public string sheetName { get; set; }
/// <summary>
/// 展示得列
/// </summary>
public List<ExcleColumn> ColumnList { get; set; }
/// <summary>
/// 数据源
/// </summary>
public DataSet DataList { get; set; }
}
/// <summary>
/// 列
/// </summary>
public class ExcleColumn
{
/// <summary>
/// 列名对应得数据库字段
/// </summary>
public string ColumnKey { get; set; }
/// <summary>
/// 列名
/// </summary>
public string ColumnValue { get; set; }
}
/// <summary>
/// 把导出的路径转换为http响应输出流
/// </summary>
/// <param name="filePath"></param>
public void OutputExcel(string filePath)
{
FileInfo fileInfo = new FileInfo(filePath);
Response.Clear();
Response.ClearContent();
Response.ClearHeaders();
Response.AddHeader("Content-Disposition", "attachment;filename=" + fileInfo.Name);
Response.AddHeader("Content-Length", fileInfo.Length.ToString());
Response.AddHeader("Content-Transfer-Encoding", "binary");
Response.ContentType = "application/octet-stream";
Response.ContentEncoding = System.Text.Encoding.GetEncoding("gb2312");
Response.WriteFile(fileInfo.FullName);
Response.Flush();
Response.End();
}
如何使用帮助类
ExcleHelper excle = new ExcleHelper();
List<ExcleSheetColumnData> sheetColumns = new List<ExcleSheetColumnData>();
//一个excleSheet代表一个sheet
ExcleSheetColumnData excleSheet = new ExcleSheetColumnData();
excleSheet.sheetName = "第一个sheet1";
excleSheet.DataList = new AppInManager().GetDataSetAppInSum1(Bind());//当前这个sheet所展示的数据 所绑定的是一个DataSet
List<ExcleColumn> columns = new List<ExcleColumn>();
//columns.Add(new ExcleColumn() { ColumnKey = "绑定的字段名称", ColumnValue = "展示的列名" });
columns.Add(new ExcleColumn() { ColumnKey = "Num", ColumnValue = "序号" });
columns.Add(new ExcleColumn() { ColumnKey = "AddressType", ColumnValue = "所在镇区" });
columns.Add(new ExcleColumn() { ColumnKey = "AppName", ColumnValue = "公司名称" });
columns.Add(new ExcleColumn() { ColumnKey = "AppAddress", ColumnValue = "地址" });
columns.Add(new ExcleColumn() { ColumnKey = "fa", ColumnValue = "发明数量" });
excleSheet.ColumnList = columns;
sheetColumns.Add(excleSheet);
//ExcleSheetColumnData excleSheet2 = new ExcleSheetColumnData();
//.....
//....
//sheetColumns.Add(excleSheet2);
//返回的是文档的保存的位置（路径）
string filePath = excle.Excle("有效专利汇总", sheetColumns);
OutputExcel(filePath);//下载到客户端，自己定义
注意：该帮助类只是把当前导出的数据存到该路径下了，并没有下载到客户端