NPOIExcel

public class NPOIExcel
    {
        private string _title;
        private string _sheetName;
        private string _filePath;

        /// <summary>
        /// 导出到Excel
        /// </summary>
        /// <param name="table"></param>
        /// <returns></returns>
        public bool ToExcel(DataTable table)
        {
            FileStream fs = new FileStream(this._filePath, FileMode.OpenOrCreate, FileAccess.ReadWrite);
            IWorkbook workBook = new HSSFWorkbook();
            this._sheetName = this._sheetName.IsEmpty() ? "sheet1" : this._sheetName;
            ISheet sheet = workBook.CreateSheet(this._sheetName);

            //处理表格标题
            IRow row = sheet.CreateRow();
            row.CreateCell().SetCellValue(this._title);
            sheet.AddMergedRegion(new CellRangeAddress(, , , table.Columns.Count - ));
            row.Height = ;

            ICellStyle cellStyle = workBook.CreateCellStyle();
            IFont font = workBook.CreateFont();
            font.FontName = "微软雅黑";
            font.FontHeightInPoints = ;
            cellStyle.SetFont(font);
            cellStyle.VerticalAlignment = VerticalAlignment.Center;
            cellStyle.Alignment = HorizontalAlignment.Center;
            row.Cells[].CellStyle = cellStyle;

            //处理表格列头
            row = sheet.CreateRow();
            for (int i = ; i < table.Columns.Count; i++)
            {
                row.CreateCell(i).SetCellValue(table.Columns[i].ColumnName);
                row.Height = ;
                sheet.AutoSizeColumn(i);
            }

            //处理数据内容
            for (int i = ; i < table.Rows.Count; i++)
            {
                row = sheet.CreateRow( + i);
                row.Height = ;
                for (int j = ; j < table.Columns.Count; j++)
                {
                    row.CreateCell(j).SetCellValue(table.Rows[i][j].ToString());
                    sheet.SetColumnWidth(j,  * );
                }
            }

            //写入数据流
            workBook.Write(fs);
            fs.Flush();
            fs.Close();

            return true;
        }

        /// <summary>
        /// 导出到Excel
        /// </summary>
        /// <param name="table"></param>
        /// <param name="title"></param>
        /// <param name="sheetName"></param>
        /// <returns></returns>
        public bool ToExcel(DataTable table, string title, string sheetName, string filePath)
        {
            this._title = title;
            this._sheetName = sheetName;
            this._filePath = filePath;
            return ToExcel(table);
        }
    }