.Net之Nopi Excel数据导出和批量导入功能

/// <summary>
/// 数据导入
/// </summary>
/// <param name="FileStram"></param>
/// <returns></returns>
public ActionResult DataImport(HttpPostedFileBase file)
{
var message="";
int Columns = ;
//判断是否提交excel文件
var FileName = file.FileName.Split('.');
if (file!=null&&file.ContentLength>)
{
if (FileName[]=="xls"||FileName[]== "xlsx")
{
//首先我们需要导入数据的话第一步其实就是先把excel数据保存到本地中，然后通过Npoi封装的方法去读取已保存的Excel数据 string DictorysPath=Server.MapPath("~/Content/ExcelFiles/"+ DateTime.Now.ToString("yyyyMMdd"));
if (!System.IO.Directory.Exists(DictorysPath))
{
System.IO.Directory.CreateDirectory(DictorysPath);
} file.SaveAs(System.IO.Path.Combine(DictorysPath,file.FileName)); //将Excel数据转化为DataTable数据源
DataTable Dt=NpoiHelper.Import(System.IO.Path.Combine(DictorysPath, file.FileName), FileName[]);
List<UserInfo> list = new List<UserInfo>(); for (int i = ; i < Dt.Rows.Count; i++)
{
UserInfo U = new UserInfo();
//从行索引从1开始，标题除外
U.UserName = Dt.Rows[i][].ToString();
U.Sex = Dt.Rows[i][].ToString();
U.Phone = Dt.Rows[i][].ToString();
U.Hobby = Dt.Rows[i][].ToString();
list.Add(U);
} //数据全部添加
UserEntites.Set<UserInfo>().AddRange(list);
Columns=UserEntites.SaveChanges();
if (Columns>)
{
message = "导入成功";
}
else
{
message = "导入失败";
} }
else
{
message = "格式错误";
}
}
else
{
message = "未找到需要导入的数据";
}
ViewBag.Columns = Columns;
ViewBag.Message = message;
return View();
}

/// <summary>
/// 数据导出
/// </summary>
/// <returns></returns>
[HttpPost]
public JsonResult Export()
{
try
{
//导出所有数据
var All_ListData = UserEntites.UserInfo.ToList(); //将list 转化为datatable类型
var Dt = DatabaseOpreas._.ListToDataTable(All_ListData); NpoiHelper.Export(Dt, "用户信息", Server.MapPath("~/Content/Export.xls"));//这里的路径是需要写入你需要保存的文件格式的，不需要创建自动检测创建 return Json(new {code=,msg= "/Content/Export.xls" });
}
catch (Exception ex)
{
return Json(new {code=,msg=ex.Message });
} }

using NPOI.HSSF.UserModel;
using NPOI.SS.UserModel;
using NPOI.SS.Util;
using NPOI.XSSF.UserModel;
using System;
using System.Collections.Generic;
using System.Data;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;namespace Utility
{
/// <summary>
/// NPOI操作帮助类
/// </summary>
public class NpoiHelper
{
/// <summary>
/// DataTable导出到Excel文件
/// </summary>
/// <param name="dtSource">源DataTable</param>
/// <param name="strHeaderText">表头文本</param>
/// <param name="strFileName">保存位置</param>
public static void Export(DataTable dtSource, string strHeaderText, string strFileName)
{
using (MemoryStream ms = Export(dtSource, strHeaderText))
{
using (FileStream fs = new FileStream(strFileName, FileMode.Create, FileAccess.Write))
{
//数据填写
byte[] data = ms.ToArray();
fs.Write(data, , data.Length);
fs.Flush();
}
}
} /// <summary>
/// DataTable导出到Excel的MemoryStream
/// </summary>
/// <param name="dtSource">源DataTable</param>
/// <param name="strHeaderText">表头文本</param>
public static MemoryStream Export(DataTable dtSource, string strHeaderText)
{
HSSFWorkbook workbook = new HSSFWorkbook();
ISheet sheet = workbook.CreateSheet(); ICellStyle dateStyle = workbook.CreateCellStyle();
IDataFormat format = workbook.CreateDataFormat();
dateStyle.DataFormat = format.GetFormat("yyyy-MM-dd"); #region 取得每列的列宽（最大宽度）
int[] arrColWidth = new int[dtSource.Columns.Count];
foreach (DataColumn item in dtSource.Columns)
{
//GBK对应的code page是CP936
arrColWidth[item.Ordinal] = Encoding.GetEncoding().GetBytes(item.ColumnName.ToString()).Length;
}
for (int i = ; i < dtSource.Rows.Count; i++)
{
for (int j = ; j < dtSource.Columns.Count; j++)
{
int intTemp = Encoding.GetEncoding().GetBytes(dtSource.Rows[i][j].ToString()).Length;
if (intTemp > arrColWidth[j])
{
arrColWidth[j] = intTemp;
}
}
}
#endregion int rowIndex = ; foreach (DataRow row in dtSource.Rows)
{
#region 新建表，填充表头，填充列头，样式
if (rowIndex == || rowIndex == )
{
if (rowIndex != )
{
sheet = workbook.CreateSheet();
} #region 表头及样式
{
IRow headerRow = sheet.CreateRow();
headerRow.HeightInPoints = ;
headerRow.CreateCell().SetCellValue(strHeaderText);//第一列表头名称 ICellStyle headStyle = workbook.CreateCellStyle();
headStyle.Alignment = HorizontalAlignment.Center;
IFont font = workbook.CreateFont();
font.FontHeightInPoints = ;
font.Boldweight = ;
headStyle.SetFont(font); headerRow.GetCell().CellStyle = headStyle; sheet.AddMergedRegion(new CellRangeAddress(, , , dtSource.Columns.Count - ));
}
#endregion #region 列头及样式
{
//也可自定义标题名称，填写到 headerRow.CreateCell(1).SetCellValue();需使用directory<string,string>先填写标题，然后遍历操作中即可
IRow headerRow = sheet.CreateRow();
ICellStyle headStyle = workbook.CreateCellStyle();
headStyle.Alignment = HorizontalAlignment.Center;
IFont font = workbook.CreateFont();
font.FontHeightInPoints = ;
font.Boldweight = ;
headStyle.SetFont(font); foreach (DataColumn column in dtSource.Columns)
{
headerRow.CreateCell(column.Ordinal).SetCellValue(column.ColumnName);
headerRow.GetCell(column.Ordinal).CellStyle = headStyle; //设置列宽
sheet.SetColumnWidth(column.Ordinal, (arrColWidth[column.Ordinal] + ) * ); }
}
#endregion rowIndex = ;
}
#endregion #region 填充内容
ICellStyle contentStyle = workbook.CreateCellStyle();
contentStyle.Alignment = HorizontalAlignment.Left;
IRow dataRow = sheet.CreateRow(rowIndex);
foreach (DataColumn column in dtSource.Columns)
{
ICell newCell = dataRow.CreateCell(column.Ordinal);
newCell.CellStyle = contentStyle; 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
DateTime dateV;
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 = ;
int.TryParse(drValue, out intV);
newCell.SetCellValue(intV);
break;
case "System.Decimal"://浮点型
case "System.Double":
double doubV = ;
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 = ; //sheet.Dispose();
//workbook.Dispose();//一般只用写这一个就OK了，他会遍历并释放所有资源，但当前版本有问题所以只释放sheet
return ms;
} } /// <summary>
/// 读取excel,将数据Excel数据源转化为datatable类型
/// 默认第一行为标头
/// </summary>
/// <param name="strFileName">excel文档路径</param>
/// <returns></returns>
public static DataTable Import(string strFileName,string FileType)
{
IWorkbook hssfworkbook;
DataTable dt = new DataTable(); //HSSFWorkbook hssfworkbook;
using (FileStream file = new FileStream(strFileName, FileMode.Open, FileAccess.Read))//数据读取
{
////XSSFWorkbook 适用XLSX格式，HSSFWorkbook 适用XLS格式
//不同格式excle判断
if (FileType == "xls")
{
hssfworkbook = new HSSFWorkbook(file);
}
else
{
hssfworkbook = new XSSFWorkbook(file);
}
}
ISheet sheet = hssfworkbook.GetSheetAt();
System.Collections.IEnumerator rows = sheet.GetRowEnumerator(); IRow headerRow = sheet.GetRow();
int cellCount = headerRow.LastCellNum; for (int j = ; j < cellCount; j++)
{
ICell cell = headerRow.GetCell(j);
dt.Columns.Add(cell.ToString());
} for (int i = (sheet.FirstRowNum + ); 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;
} }
}