什么是NPOI

该项目是位于http://poi.apache.org/的POI Java项目的.NET版本。POI是一个开源项目,可以帮助您读取/写入xls,doc,ppt文件。它有着广泛的应用。本文给大家介绍ASP.Net MVC利用NPOI导入导出Excel的问题。

因近期项目遇到所以记录一下:

首先导出Excel:

首先引用NPOI包

(Action一定要用FileResult)

///         /// 批量导出本校第一批派位学生        ///         ///         public FileResult ExportStu2()        {            string schoolname = "401";            //创建Excel文件的对象            NPOI.HSSF.UserModel.HSSFWorkbook book = new NPOI.HSSF.UserModel.HSSFWorkbook();            //添加一个sheet            NPOI.SS.UserModel.ISheet sheet1 = book.CreateSheet("Sheet1");            //获取list数据            List listRainInfo = m_BLL.GetSchoolListAATQ(schoolname);            //给sheet1添加第一行的头部标题            NPOI.SS.UserModel.IRow row1 = sheet1.CreateRow(0);            row1.CreateCell(0).SetCellValue("电脑号");            row1.CreateCell(1).SetCellValue("姓名");            //将数据逐步写入sheet1各个行            for (int i = 0; i < listRainInfo.Count; i++)            {                NPOI.SS.UserModel.IRow rowtemp = sheet1.CreateRow(i + 1);                rowtemp.CreateCell(0).SetCellValue(listRainInfo[i].ST_CODE.ToString());                rowtemp.CreateCell(1).SetCellValue(listRainInfo[i].ST_NAME.ToString());            }            // 写入到客户端             System.IO.MemoryStream ms = new System.IO.MemoryStream();            book.Write(ms);            ms.Seek(0, SeekOrigin.Begin);            return File(ms, "application/vnd.ms-excel", "第一批电脑派位生名册.xls");        }

前台直接写就可实现:

@Html.ActionLink("点击导出名册", "ExportStu2")

下面说一下导入:

首先说一些前台吧,mvc上传注意必须加new { enctype = “multipart/form-data” }:

2、@using(@Html.BeginForm("ImportStu", "ProSchool", FormMethod.Post, new { enctype = "multipart/form-data" })){ 选择上传文件:(工作表名为“Sheet1”,“电脑号”在A1单元格。) } 

后台实现:只传路径得出DataTable:

///         /// Excel导入        ///         ///         ///         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);//第一行为标题行                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;            }                    }

补充一个类

///         /// 根据Excel列类型获取列的值        ///         /// Excel列        ///         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,就想怎么操作就怎么操作了

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