.net mvc利用NPOI導入導出excel
來源：程序員人生 發布時間：2015-01-28 08:29:44 閱讀次數：4118次
因近期項目做到，所以記錄1下：
1、導出Excel ：
首先援用NPOI包，從這里下載》download
（Action1定要用FileResult）
/// <summary>
/// 批量導出需要導出的列表
/// </summary>
/// <returns></returns>
public FileResult ExportStu2()
{
//獲得list數據
var checkList = (from oc in db.OrganizeCustoms
join o in db.Organizes.DefaultIfEmpty() on oc.custom_id equals o.id
where oc.organize_id == 1
select new
{
customer_id = o.id,
customer_name = o.name
}).ToList();
//創建Excel文件的對象
NPOI.HSSF.UserModel.HSSFWorkbook book = new NPOI.HSSF.UserModel.HSSFWorkbook();
//添加1個sheet
NPOI.SS.UserModel.ISheet sheet1 = book.CreateSheet("Sheet1");
//貌似這里可以設置各種樣式字體色彩背景等，但是否是很方便，這里就不設置了
//給sheet1添加第1行的頭部標題
NPOI.SS.UserModel.IRow row1 = sheet1.CreateRow(0);
row1.CreateCell(0).SetCellValue("編號");
row1.CreateCell(1).SetCellValue("姓名");
//....N行
//將數據逐漸寫入sheet1各個行
for (int i = 0; i < checkList.Count; i++)
{
NPOI.SS.UserModel.IRow rowtemp = sheet1.CreateRow(i + 1);
rowtemp.CreateCell(0).SetCellValue(checkList[i].customer_id.ToString());
rowtemp.CreateCell(1).SetCellValue(checkList[i].customer_name.ToString());
//....N行
}
// 寫入到客戶端
System.IO.MemoryStream ms = new System.IO.MemoryStream();
book.Write(ms);
ms.Seek(0, SeekOrigin.Begin);
DateTime dt = DateTime.Now;
string dateTime = dt.ToString("yyMMddHHmmssfff");
string fileName = "查詢結果" + dateTime + ".xls";
return File(ms, "application/vnd.ms-excel", fileName);
}
前臺直接寫便可實現：
@Html.ActionLink("點擊導出Excel", "ExportStu2")
這里有1篇專門介紹設置樣式的文章：
http://www.cnblogs.com/puzi0315/p/3265958.html
http://blog.csdn.net/xhccom/article/details/7687264
http://blog.csdn.net/bestreally/article/details/23257851
2、導入Excel：
首先說1些前臺吧，mvc上傳注意必須加 new { enctype = "multipart/form-data" }
<td>
@using (@Html.BeginForm("ImportStu", "ProSchool", FormMethod.Post, new { enctype = "multipart/form-data" }))
{
<text>選擇上傳文件：（工作表名為“Sheet1”，“電腦號”在A1單元格。）</text>
<input name="file" type="file" id="file" />
<input type="submit" name="Upload" value="批量導入第1批名冊" />
}
</td>
后臺實現：只傳路徑得出DataTable：
/// <summary>
/// Excel導入
/// </summary>
/// <param name="filePath"></param>
/// <returns></returns>
public DataTable ImportExcelFile(string filePath)
{
HSSFWorkbook hssfworkbook;
#region//初始化信息
try
{
using (FileStream file = new FileStream(filePath, FileMode.Open, FileAccess.Read))
{
hssfworkbook = new HSSFWorkbook(file);
}
}
catch (Exception e)
{
throw e;
}
#endregion
using (NPOI.SS.UserModel.ISheet sheet = hssfworkbook.GetSheetAt(0))
{
DataTable table = new DataTable();
IRow headerRow = sheet.GetRow(0);//第1行動標題行
int cellCount = headerRow.LastCellNum;//LastCellNum = PhysicalNumberOfCells
int rowCount = sheet.LastRowNum;//LastRowNum = PhysicalNumberOfRows - 1
//handling header.
for (int i = headerRow.FirstCellNum; i < cellCount; i++)
{
DataColumn column = new DataColumn(headerRow.GetCell(i).StringCellValue);
table.Columns.Add(column);
}
for (int i = (sheet.FirstRowNum + 1); i <= rowCount; i++)
{
IRow row = sheet.GetRow(i);
DataRow dataRow = table.NewRow();
if (row != null)
{
for (int j = row.FirstCellNum; j < cellCount; j++)
{
if (row.GetCell(j) != null)
dataRow[j] = GetCellValue(row.GetCell(j));
}
}
table.Rows.Add(dataRow);
}
return table;
}
}
補充1個類：
/// <summary>
/// 根據Excel列類型獲得列的值
/// </summary>
/// <param name="cell">Excel列</param>
/// <returns></returns>
private static string GetCellValue(ICell cell)
{
if (cell == null){ return string.Empty; }
switch (cell.CellType)
{
case CellType.BLANK:
return string.Empty;
case CellType.BOOLEAN:
return cell.BooleanCellValue.ToString();
case CellType.ERROR:
return cell.ErrorCellValue.ToString();
case CellType.NUMERIC:
case CellType.Unknown:
default:
return cell.ToString();//This is a trick to get the correct value of the cell. NumericCellValue will return a numeric value no matter the cell value is a date or a number
case CellType.STRING:
return cell.StringCellValue;
case CellType.FORMULA:
try
{
HSSFFormulaEvaluator e = new HSSFFormulaEvaluator(cell.Sheet.Workbook);
e.EvaluateInCell(cell);
return cell.ToString();
}
catch
{
return cell.NumericCellValue.ToString();
}
}
}
得到DataTable后，就想怎樣操作就怎樣操作了。
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