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NETCORE API NPOI导出功能+Vue下载(二)

NETCORE API NPOI导出功能+Vue下载(二)

作者: 醉酒的姑娘 | 来源:发表于2021-11-16 09:18 被阅读0次

需求:前后端完全分离的项目,需要一个导出功能,前端使用ant design vue,后端 NetCore5.0

API导出功能:

        /// <summary>
        /// 导出
        /// </summary>
        /// <param name="input">筛选条件</param>
        /// <returns></returns>
        [HttpGet("/ActiveManage/exportExcel")]
        public async Task<IActionResult> ExcelDataExprot([FromQuery] ActiveManageInputBySearch input) {
            
           //ExcelActive 类名 根据不同实体进行导出
          //参数活动管理,导出excel名称和sheet名称
          // 参数entities  List<ExcelActive >
          // 参数title  excel 标题
           return await NPOIHelper<ExcelActive>.ExcelDataExprot("活动管理", entities,title);
            
        }
image.png

NPOI导出公共类:

namespace Furion.Extras.Admin.NET.Application
{
    public class  NPOIHelper<T> where T:class
    {
        public static async Task<IActionResult> ExcelDataExprot(string tablename,List<T> list,List<string> ExcelTitle) {

            try {
            //创建Excel文件对象
            var workbook = new HSSFWorkbook();
            //创建工作表sheet0
            var sheet = workbook.CreateSheet(tablename);
            //设置顶部大标题样式
            var TitleCellStyleFont = NpoiExcelExportHelper._.CreateStyle(workbook,HorizontalAlignment.Center,VerticalAlignment.Center,20,true,700,"楷体", true, false, false, true, FillPattern.SolidForeground, HSSFColor.Coral.Index, HSSFColor.White.Index,
                    FontUnderlineType.None, FontSuperScript.None, false);
            //第一行表单
            var row = NpoiExcelExportHelper._.CreateRow(sheet, 0, 28);
            var cell = row.CreateCell(0);
            //合并单元格 例: 第1行到第2行 第3列到第4列围成的矩形区域
            //TODO:关于Excel行列单元格合并问题
            /**
              第一个参数:从第几行开始合并
              第二个参数:到第几行结束合并
              第三个参数:从第几列开始合并
              第四个参数:到第几列结束合并
            **/
            CellRangeAddress region = new CellRangeAddress(0, 0, 0, ExcelTitle.Count()-1);
            sheet.AddMergedRegion(region);
            cell.SetCellValue(tablename);//合并单元格后,只需对第一个位置赋值即可(TODO:顶部标题)
            cell.CellStyle = TitleCellStyleFont;
            //二级标题列样式设置
            var headTopStyle = NpoiExcelExportHelper._.CreateStyle(workbook, HorizontalAlignment.Center, VerticalAlignment.Center, 15, true, 700, "楷体", true, false, false, true, FillPattern.SolidForeground, HSSFColor.Grey25Percent.Index, HSSFColor.Black.Index,
            FontUnderlineType.None, FontSuperScript.None, false);
                //表头名称
                var headerName = list[0];

                row = NpoiExcelExportHelper._.CreateRow(sheet, 1, 24);//第二行
                for(int i=0;i< ExcelTitle.Count;i++) { 
             
                cell = NpoiExcelExportHelper._.CreateCells(row, headTopStyle, i, ExcelTitle[i]);
                    
                    //设置单元格宽度
                 sheet.SetColumnWidth(i, 7000);

                }

            #region 单元格内容信息

            //单元格边框样式
            var cellStyle = NpoiExcelExportHelper._.CreateStyle(workbook, HorizontalAlignment.Center, VerticalAlignment.Center, 10, true, 400);

            //左侧列单元格合并 begin
            //TODO:关于Excel行列单元格合并问题(合并单元格后,只需对第一个位置赋值即可)
            /**
              第一个参数:从第几行开始合并
              第二个参数:到第几行结束合并
              第三个参数:从第几列开始合并
              第四个参数:到第几列结束合并
            **/
         
            for (var i = 0; i < list.Count(); i++)
            {
                    row = NpoiExcelExportHelper._.CreateRow(sheet, i + 2, 20); //sheet.CreateRow(i+2);//在上面表头的基础上创建行
                    int y = 0;
                    foreach (System.Reflection.PropertyInfo p in list[i].GetType().GetProperties())
                    {
                        cell = NpoiExcelExportHelper._.CreateCells(row, cellStyle, y, p.GetValue(list[i]) != null ? p.GetValue(list[i]).ToString() : null);
                        y++;
                    }
            }
                #endregion

                //excel保存文件名
                string excelFileName = tablename + DateTime.Now.ToString("yyyyMMddHHmmss") + ".xls";
                //将Excel表格转化为流,输出

                MemoryStream bookStream = new MemoryStream();//创建文件流

                workbook.Write(bookStream); //文件写入流(向流中写入字节序列)

                bookStream.Seek(0, SeekOrigin.Begin);//输出之前调用Seek,把0位置指定为开始位置
               

                return await Task.FromResult(new FileStreamResult(bookStream, "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet")
                {
                    FileDownloadName =excelFileName 
            });
            }
            catch (Exception e)
            {
                return null;
            }
        }
}
    public class NpoiExcelExportHelper
    {
        private static NpoiExcelExportHelper _exportHelper;

        public static NpoiExcelExportHelper _
        {
            get => _exportHelper ?? (_exportHelper = new NpoiExcelExportHelper());
            set => _exportHelper = value;
        }

        /// <summary>
        /// TODO:先创建行,然后在创建对应的列
        /// 创建Excel中指定的行
        /// </summary>
        /// <param name="sheet">Excel工作表对象</param>
        /// <param name="rowNum">创建第几行(从0开始)</param>
        /// <param name="rowHeight">行高</param>
        public HSSFRow CreateRow(ISheet sheet, int rowNum, float rowHeight)
        {
            HSSFRow row = (HSSFRow)sheet.CreateRow(rowNum); //创建行
            row.HeightInPoints = rowHeight; //设置列头行高
            return row;
        }

        /// <summary>
        /// 创建行内指定的单元格
        /// </summary>
        /// <param name="row">需要创建单元格的行</param>
        /// <param name="cellStyle">单元格样式</param>
        /// <param name="cellNum">创建第几个单元格(从0开始)</param>
        /// <param name="cellValue">给单元格赋值</param>
        /// <returns></returns>
        public HSSFCell CreateCells(HSSFRow row, HSSFCellStyle cellStyle, int cellNum, string cellValue)
        {
            HSSFCell cell = (HSSFCell)row.CreateCell(cellNum); //创建单元格
            cell.CellStyle = cellStyle; //将样式绑定到单元格
            if (!string.IsNullOrWhiteSpace(cellValue))
            {
                //单元格赋值
                cell.SetCellValue(cellValue);
            }

            return cell;
        }


        /// <summary>
        /// 行内单元格常用样式设置
        /// </summary>
        /// <param name="workbook">Excel文件对象</param>
        /// <param name="hAlignment">水平布局方式</param>
        /// <param name="vAlignment">垂直布局方式</param>
        /// <param name="fontHeightInPoints">字体大小</param>
        /// <param name="isAddBorder">是否需要边框</param>
        /// <param name="boldWeight">字体加粗 (None = 0,Normal = 400,Bold = 700</param>
        /// <param name="fontName">字体(仿宋,楷体,宋体,微软雅黑...与Excel主题字体相对应)</param>
        /// <param name="isAddBorderColor">是否增加边框颜色</param>
        /// <param name="isItalic">是否将文字变为斜体</param>
        /// <param name="isLineFeed">是否自动换行</param>
        /// <param name="isAddCellBackground">是否增加单元格背景颜色</param>
        /// <param name="fillPattern">填充图案样式(FineDots 细点,SolidForeground立体前景,isAddFillPattern=true时存在)</param>
        /// <param name="cellBackgroundColor">单元格背景颜色(当isAddCellBackground=true时存在)</param>
        /// <param name="fontColor">字体颜色</param>
        /// <param name="underlineStyle">下划线样式(无下划线[None],单下划线[Single],双下划线[Double],会计用单下划线[SingleAccounting],会计用双下划线[DoubleAccounting])</param>
        /// <param name="typeOffset">字体上标下标(普通默认值[None],上标[Sub],下标[Super]),即字体在单元格内的上下偏移量</param>
        /// <param name="isStrikeout">是否显示删除线</param>
        /// <returns></returns>
        public HSSFCellStyle CreateStyle(HSSFWorkbook workbook, HorizontalAlignment hAlignment, VerticalAlignment vAlignment, short fontHeightInPoints, bool isAddBorder, short boldWeight, string fontName = "宋体", bool isAddBorderColor = true, bool isItalic = false, bool isLineFeed = false, bool isAddCellBackground = false, FillPattern fillPattern = FillPattern.NoFill, short cellBackgroundColor = HSSFColor.Yellow.Index, short fontColor = HSSFColor.Black.Index, FontUnderlineType underlineStyle =
            FontUnderlineType.None, FontSuperScript typeOffset = FontSuperScript.None, bool isStrikeout = false)
        {
            HSSFCellStyle cellStyle = (HSSFCellStyle)workbook.CreateCellStyle(); //创建列头单元格实例样式
            cellStyle.Alignment = hAlignment; //水平居中
            cellStyle.VerticalAlignment = vAlignment; //垂直居中
            cellStyle.WrapText = isLineFeed;//自动换行

            //背景颜色,边框颜色,字体颜色都是使用 HSSFColor属性中的对应调色板索引,关于 HSSFColor 颜色索引对照表,详情参考:https://www.cnblogs.com/Brainpan/p/5804167.html

            //TODO:引用了NPOI后可通过ICellStyle 接口的 FillForegroundColor 属性实现 Excel 单元格的背景色设置,FillPattern 为单元格背景色的填充样式

            //TODO:十分注意,要设置单元格背景色必须是FillForegroundColor和FillPattern两个属性同时设置,否则是不会显示背景颜色
            if (isAddCellBackground)
            {
                cellStyle.FillForegroundColor = cellBackgroundColor;//单元格背景颜色
                cellStyle.FillPattern = fillPattern;//填充图案样式(FineDots 细点,SolidForeground立体前景)
            }


            //是否增加边框
            if (isAddBorder)
            {
                //常用的边框样式 None(没有),Thin(细边框,瘦的),Medium(中等),Dashed(虚线),Dotted(星罗棋布的),Thick(厚的),Double(双倍),Hair(头发)[上右下左顺序设置]
                cellStyle.BorderBottom = BorderStyle.Thin;
                cellStyle.BorderRight = BorderStyle.Thin;
                cellStyle.BorderTop = BorderStyle.Thin;
                cellStyle.BorderLeft = BorderStyle.Thin;
            }

            //是否设置边框颜色
            if (isAddBorderColor)
            {
                //边框颜色[上右下左顺序设置]
                cellStyle.TopBorderColor = HSSFColor.DarkGreen.Index;//DarkGreen(黑绿色)
                cellStyle.RightBorderColor = HSSFColor.DarkGreen.Index;
                cellStyle.BottomBorderColor = HSSFColor.DarkGreen.Index;
                cellStyle.LeftBorderColor = HSSFColor.DarkGreen.Index;
            }

            /**
             * 设置相关字体样式
             */
            var cellStyleFont = (HSSFFont)workbook.CreateFont(); //创建字体

            //假如字体大小只需要是粗体的话直接使用下面该属性即可
            //cellStyleFont.IsBold = true;

            cellStyleFont.Boldweight = boldWeight; //字体加粗
            cellStyleFont.FontHeightInPoints = fontHeightInPoints; //字体大小
            cellStyleFont.FontName = fontName;//字体(仿宋,楷体,宋体 )
            cellStyleFont.Color = fontColor;//设置字体颜色
            cellStyleFont.IsItalic = isItalic;//是否将文字变为斜体
            cellStyleFont.Underline = underlineStyle;//字体下划线
            cellStyleFont.TypeOffset = typeOffset;//字体上标下标
            cellStyleFont.IsStrikeout = isStrikeout;//是否有删除线

            cellStyle.SetFont(cellStyleFont); //将字体绑定到样式
            return cellStyle;
        }
    }
}

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