代码：
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 CMS.Common
{
public class ExcelHelper : IDisposable
{
private string fileName = null; //文件名
private IWorkbook workbook = null;
private FileStream fs = null;
private bool disposed; public ExcelHelper(string fileName)
{
this.fileName = fileName;
disposed = false;
} /// <summary>
/// 将DataTable数据导入到excel中
/// </summary>
/// <param name="data">要导入的数据</param>
/// <param name="isColumnWritten">DataTable的列名是否要导入</param>
/// <param name="sheetName">要导入的excel的sheet的名称</param>
/// <returns>导入数据行数(包含列名那一行)</returns>
public int NPOIDataTableToExcel(DataTable data, string sheetName, bool isColumnWritten)
{
int i = ;
int j = ;
int count = ;
ISheet sheet = null; fs = new FileStream(fileName, FileMode.OpenOrCreate, FileAccess.ReadWrite);
if (fileName.IndexOf(".xlsx") > ) // 2007版本
workbook = new XSSFWorkbook();
else if (fileName.IndexOf(".xls") > ) // 2003版本
workbook = new HSSFWorkbook(); try
{
if (workbook != null)
{
sheet = workbook.CreateSheet(sheetName);
}
else
{
return -;
} if (isColumnWritten == true) //写入DataTable的列名
{
IRow row = sheet.CreateRow();
for (j = ; j < data.Columns.Count; ++j)
{
row.CreateCell(j).SetCellValue(data.Columns[j].ColumnName);
}
count = ;
}
else
{
count = ;
} for (i = ; i < data.Rows.Count; ++i)
{
IRow row = sheet.CreateRow(count);
for (j = ; j < data.Columns.Count; ++j)
{
row.CreateCell(j).SetCellValue(data.Rows[i][j].ToString());
}
++count;
}
workbook.Write(fs); //写入到excel
return count;
}
catch (Exception ex)
{
Console.WriteLine("Exception: " + ex.Message);
return -;
}
} /// <summary>
/// 将excel中的数据导入到DataTable中
/// </summary>
/// <param name="sheetName">excel工作薄sheet的名称</param>
/// <param name="isFirstRowColumn">第一行是否是DataTable的列名</param>
/// <returns>返回的DataTable</returns>
public DataTable NPOIExcelToDataTable(string sheetName, bool isFirstRowColumn)
{
ISheet sheet = null;
DataTable data = new DataTable();
int startRow = ;
try
{
fs = new FileStream(fileName, FileMode.Open, FileAccess.Read);
if (fileName.IndexOf(".xlsx") > ) // 2007版本
{
workbook = new XSSFWorkbook(fs);
}
else if (fileName.IndexOf(".xls") > ) // 2003版本
{
workbook = new HSSFWorkbook(fs);
}
if (sheetName != null)
{
sheet = workbook.GetSheet(sheetName);
if (sheet == null) //如果没有找到指定的sheetName对应的sheet，则尝试获取第一个sheet
{
sheet = workbook.GetSheetAt();
}
}
else
{
sheet = workbook.GetSheetAt();
}
if (sheet != null)
{
IRow firstRow = sheet.GetRow();
int cellCount = firstRow.LastCellNum; //一行最后一个cell的编号 即总的列数 if (isFirstRowColumn)
{
for (int i = firstRow.FirstCellNum; i < cellCount; ++i)
{
ICell cell = firstRow.GetCell(i);
if (cell != null)
{
string cellValue = cell.StringCellValue;
if (cellValue != null)
{
DataColumn column = new DataColumn(cellValue);
data.Columns.Add(column);
}
}
}
startRow = sheet.FirstRowNum + ;
}
else
{
startRow = sheet.FirstRowNum;
}
//startRow = sheet.FirstRowNum + 1; //最后一列的标号
int rowCount = sheet.LastRowNum;
for (int i = startRow; i <= rowCount; ++i)
{
IRow row = sheet.GetRow(i);
if (row == null) continue; //没有数据的行默认是null DataRow dataRow = data.NewRow();
for (int j = row.FirstCellNum; j < cellCount; ++j)
{
if (row.GetCell(j) != null) //同理，没有数据的单元格都默认是null
dataRow[j] = row.GetCell(j).ToString();
}
data.Rows.Add(dataRow);
}
} return data;
}
catch (Exception ex)
{
Console.WriteLine("Exception: " + ex.Message);
return null;
}
} public void Dispose()
{
Dispose(true);
GC.SuppressFinalize(this);
} protected virtual void Dispose(bool disposing)
{
if (!this.disposed)
{
if (disposing)
{
if (fs != null)
fs.Close();
} fs = null;
disposed = true;
}
}
}
}
使用方法：
private DataTable dt = new DataTable();
protected void Button1_Click(object sender, EventArgs e)
{
Inidata();
string path = Server.MapPath("~/ExportData/" + DateTime.Now.ToString("yyyyMMddHHmmss") + ".xlsx");
int no = new Common.ExcelHelper(path).NPOIDataTableToExcel(dt, "sheet1", true);
}
/// <summary>
/// 装载数据
/// </summary>
private void Inidata()
{
dt.TableName = "sheet1";
dt.Columns.Add("Name", typeof(string));
dt.Columns.Add("Team", typeof(string));
DataRow dr = dt.NewRow();
DataRow dr1 = dt.NewRow();
dr["Name"] = "科比";
dr["Team"] = "湖人";
dt.Rows.Add(dr);
dr1["Name"] = "詹姆斯";
dr1["Team"] = "骑士";
dt.Rows.Add(dr1);
}
最近发现，导出成 .xls 的已经不行了，只能导出 .xlsx 格式的。相关dll下载：http://pan.baidu.com/s/1o7KzI22
using Abp.Domain.Services;
using Newtonsoft.Json.Linq;
using NPOI.HSSF.UserModel;
using NPOI.SS.UserModel;
using NPOI.XSSF.UserModel;
using System;
using System.IO;
using System.Text;
using System.Web; namespace Framework.Common
{
/// <summary>
/// Excel 导入导出
/// </summary>
public class ExcelHelper : DomainService
{
/// <summary>
/// 读取 Excel
/// 如果遇到整行为空行就停止读取并返回
/// </summary>
/// <param name="jsonHeader">
/// 返回 JSON 结构所需要字段名称，与 Excel 的列头相对应
/// </param>
/// <param name="sheetIndex">
/// 读取 Excel 时从 sheetIndex Sheet 开始读取，最小值为 0
/// </param>
/// <param name="startRowIndex">
/// 读取 Excel 时从 startRowIndex 行开始读取，最小值为 0
/// </param>
/// <param name="filePath">
/// 要读取的 Excel 文件路径
/// </param>
/// <returns></returns>
public JArray ReadExcel(string[] jsonHeader, int sheetIndex, int startRowIndex, string filePath)
{
if (sheetIndex < )
throw new Exception("sheetIndex 超出最小值，最小值为 0."); if (startRowIndex < )
throw new Exception("startRowIndex 超出最小值，最小值为 0."); if (!File.Exists(filePath))
throw new Exception("文件不存，请检查文件路径是否正确"); JArray array = new JArray();
XSSFWorkbook workbook = null;
using (FileStream fs = new FileStream(filePath, FileMode.Open, FileAccess.Read))
{
workbook = new XSSFWorkbook(fs);
}
var sheet = workbook.GetSheetAt(sheetIndex);
GetRow(array, jsonHeader, sheet, startRowIndex);
return array;
}
/// <summary>
/// 读取 Excel
/// 如果遇到整行为空行就停止读取并返回
/// </summary>
/// <param name="jsonHeader">
/// 返回 JSON 结构所需要字段名称，与 Excel 的列头相对应
/// </param>
/// <param name="sheetIndex">
/// 读取 Excel 时从 sheetIndex Sheet 开始读取，最小值为 0
/// </param>
/// <param name="startRowIndex">
/// 读取 Excel 时从 startRowIndex 行开始读取，最小值为 0
/// </param>
/// <param name="fs"></param>
/// <returns></returns>
public JArray ReadExcel(string[] jsonHeader, int sheetIndex, int startRowIndex, Stream fs)
{
if (sheetIndex < )
throw new Exception("sheetIndex 超出最小值，最小值为 0."); if (startRowIndex < )
throw new Exception("startRowIndex 超出最小值，最小值为 0."); JArray array = new JArray();
XSSFWorkbook workbook = new XSSFWorkbook(fs);
var sheet = workbook.GetSheetAt(sheetIndex);
GetRow(array, jsonHeader, sheet, startRowIndex);
return array;
} /// <summary>
/// 将数据导入到 Excel 模版
/// </summary>
/// <param name="array">
/// JArray 结构，需要导入到 Excel 中的数据
/// </param>
/// <param name="jsonHeader">
/// JSON 结构所需要字段名称，与 Excel 的列头相对应
/// </param>
/// <param name="sheetIndex">
/// 读取 Excel 时从 sheetIndex Sheet 开始读取，最小值为 0
/// </param>
/// <param name="startRowIndex">
/// 读取 Excel 时从 startRowIndex 行开始读取，最小值为 0
/// </param>
/// <param name="excelTempPath">
/// Excel 模版路径
/// </param>
/// <param name="exportFileName">
/// Excel 导出时的文件名称
/// </param>
/// <param name="context">
/// HttpContext 对象
/// </param>
public void ImportDataToExcel(JArray array, string[] jsonHeader, int sheetIndex, int startRowIndex, string excelTempPath, string exportFileName, HttpContext context)
{
if (sheetIndex < )
throw new Exception("sheetIndex 超出最小值，最小值为 0."); if (startRowIndex < )
throw new Exception("startRowIndex 超出最小值，最小值为 0."); if (!File.Exists(excelTempPath))
throw new Exception("文件不存，请检查文件路径是否正确"); IWorkbook workbook = null;
string tempExt = Path.GetExtension(excelTempPath).ToLower();
using (FileStream fs = File.Open(excelTempPath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite))
{
if (tempExt == ".xls")
{
workbook = new HSSFWorkbook(fs);
}
else
{
workbook = new XSSFWorkbook(fs);
}
}
ISheet sheet = null;
if (tempExt == ".xls")
{
sheet = (HSSFSheet)workbook.GetSheetAt(sheetIndex);
}
else
{
sheet = (XSSFSheet)workbook.GetSheetAt(sheetIndex);
} IRow row = null;
ICell cell = null;
foreach (var item in array)
{
row = sheet.CreateRow(startRowIndex);
for (var h = ; h < jsonHeader.Length; h++)
{
cell = row.CreateCell(h);
cell.SetCellValue(item[jsonHeader[h]].Value<string>());
}
startRowIndex++;
} context.Response.ContentType = "application/vnd.ms-excel";
context.Response.AddHeader("Content-Disposition", "attachment;filename=" + DateTime.Now.ToString("yyyyMMddHHmmss") + ".xlsx");
context.Response.AddHeader("Content-Transfer-Encoding", "binary");
context.Response.ContentType = "application/octet-stream";
context.Response.ContentEncoding = Encoding.UTF8;
using (MemoryStream file = new MemoryStream())
{
workbook.Write(file);
byte[] buff = file.GetBuffer();
//context.Response.BinaryWrite(file.GetBuffer());//输出到浏览器 #region 输出文件
if (File.Exists(exportFileName))
{
File.Delete(exportFileName);
}
using (FileStream fs = new FileStream(exportFileName, FileMode.Create))
{
using (BinaryWriter bw = new BinaryWriter(fs))
{
bw.Write(buff, , buff.Length);
}
}
#endregion
}
} private void GetRow(JArray array, string[] jsonHeader, ISheet sheet, int rowIndex)
{
JObject json = new JObject();
var row = sheet.GetRow(rowIndex);
if (row != null)
{
var hasNext = false;
object val = string.Empty;
for (var i = ; i < jsonHeader.Length; i++)
{
var cell = row.GetCell(i);
if (cell == null)
{
val = null;
json[jsonHeader[i]] = string.Empty;
}
else
{
val = GetCellValue(json, jsonHeader[i], cell);
}
if (!hasNext && val != null)
{
// 若该行中，任意单元格不是 string.Empty 则将 hasNext 设置为 true 表示可以递归读取下一行
hasNext = true;
}
}
if (hasNext)
{
json["rowIndex"] = row.RowNum + ;
array.Add(json);
GetRow(array, jsonHeader, sheet, rowIndex + );
}
else
{
return;
}
}
} private object GetCellValue(JToken json, string head, ICell cell)
{ switch (cell.CellType)
{ case CellType.Error:
case CellType.Unknown:
case CellType.Blank:
return null; case CellType.Boolean:
json[head] = cell.BooleanCellValue;//.ToString();
return cell.BooleanCellValue;
case CellType.Numeric:
//对时间格式的处理
short format = cell.CellStyle.DataFormat;
if (format == || format == || format == || format == || format == )
{ json[head] = cell.DateCellValue;//.ToString("yyyy-mm-dd HH:mm:ss");
return cell.DateCellValue;
}
json[head] = cell.NumericCellValue;
return cell.NumericCellValue;//.ToString("N4");
}
json[head] = cell.StringCellValue;
return cell.StringCellValue;//.ToString("N4");
}
}
}
使用
string excelTempPath = System.Web.HttpContext.Current.Server.MapPath("~/TemplateFile/ItemTemp.xls");
string exportFileName = System.Web.HttpContext.Current.Server.MapPath("~/ExportFile/" + DateTime.Now.ToString("yyyyMMddHHmmss") + ".xls");
string[] jsonHeader = new string[] { "Code", "Name"};
JArray array = new JArray();
foreach (var item in items)
{
JObject json = new JObject();
json["Code"] = item.Code;
json["Name"] = item.Name;
array.Add(json);
}
new ExcelHelp().ImportDataToExcel(array, jsonHeader, , , excelTempPath, exportFileName, System.Web.HttpContext.Current);
导出的时候，注意判断后缀名。.xls 使用 HSSFWorkbook，.xlsx 使用XSSFWorkbook