public void exportExcel(Long activityId, HttpServletResponse response) throws IOException
    {
        // 获取统计报表信息
        List<ProductInfo> productInfoList = reportDao.queryStatisticReport(activityId);
        // 创建一个工作薄
        HSSFWorkbook workbook = new HSSFWorkbook();
        // 创建一个工作表sheet
        HSSFSheet sheet = workbook.createSheet("统计报表");
        // 设置单元格每列的宽度
        sheet.setColumnWidth(0, 50 * 256);
        sheet.setColumnWidth(1, 50 * 256);
        sheet.setColumnWidth(2, 10 * 256);
　　　    // 表格信息内容的样式
        HSSFCellStyle style = workbook.createCellStyle();
        // 水平居中
        style.setAlignment(HorizontalAlignment.CENTER);
        // 垂直居中
        style.setVerticalAlignment(VerticalAlignment.CENTER);
        // 行数
        int rowCount = 0;
        // 第一行的标题行
        HSSFRow row0 = sheet.createRow(rowCount++);
        // 列表格
        HSSFCell cell_title = row0.createCell(0);
        cell_title.setCellValue("统计报表");
        // 标题样式
        HSSFCellStyle style_title = workbook.createCellStyle();
        style_title.setAlignment(HorizontalAlignment.CENTER);
        style_title.setVerticalAlignment(VerticalAlignment.CENTER);
        //设置字体样式
        HSSFFont font  = workbook.createFont();
        //字号
        font.setFontHeightInPoints((short) 16);
        // 红色字体
        font.setColor(HSSFFont.COLOR_RED);
        style_title.setFont(font);
        cell_title.setCellStyle(style_title);
        sheet.addMergedRegion(new CellRangeAddress(0, 0, 0, 2));
        // 第二行的表头
        HSSFRow row1 = sheet.createRow(rowCount++);
        // 表头样式
        HSSFCellStyle style_header = workbook.createCellStyle();
        style_header.setAlignment(HorizontalAlignment.CENTER);
        style_header.setVerticalAlignment(VerticalAlignment.CENTER);
        style_header.setFillForegroundColor(new HSSFColor.SKY_BLUE().getIndex());
        style_header.setFillPattern(FillPatternType.SOLID_FOREGROUND);
        // 列表格
        HSSFCell cell_header0 = row1.createCell(0);
        cell_header0.setCellValue("展示商品名称");
        cell_header0.setCellStyle(style_header);
        HSSFCell cell_header1 = row1.createCell(1);
        cell_header1.setCellValue("SKU商品名称");
        cell_header1.setCellStyle(style_header);
        HSSFCell cell_header2 = row1.createCell(2);
        cell_header2.setCellValue("数量");
        cell_header2.setCellStyle(style_header);
        if (!StringUtils.isEmpty(productInfoList))
        {
            for (ProductInfo productInfo : productInfoList)
            {
                List<SbomInfo> sbomInfoList = productInfo.getSbomInfoList();
                for (int i = 0; i < sbomInfoList.size(); i++)
                {
                    // 行表格
                    HSSFRow row = sheet.createRow(rowCount);
                    SbomInfo sbomInfo = sbomInfoList.get(i);
                    if (i == 0)
                    {
                        // 列表格
                        HSSFCell cell0 = row.createCell(0);
                        cell0.setCellValue(productInfo.getDisPrdName());
                        cell0.setCellStyle(style);
                        // 含有2个以上数据的,则需要合并单元格
                        if (sbomInfoList.size() > 1)
                        {
                            sheet.addMergedRegion(new CellRangeAddress(rowCount, rowCount + sbomInfoList.size() - 1, 0, 0));
                        }
                    }
                    // 列表格
                    HSSFCell cell1 = row.createCell(1);
                    cell1.setCellValue(sbomInfo.getSbomName());
                    cell1.setCellStyle(style);
                    // 列表格
                    HSSFCell cell2 = row.createCell(2);
                    cell2.setCellValue(sbomInfo.getNumber());
                    cell2.setCellStyle(style);
                    // 行数增1
                    rowCount = rowCount + 1;
                }
            }
        }
        // 设置文件名
        String fileName = "统计报表.xls";
        response.setContentType("application/vnd.ms-excel");
        response.setHeader("Content-disposition", "attachment;filename=" + URLEncoder.encode(fileName, "UTF-8"));
        response.setHeader("Pragma", "No-cache");
        OutputStream outputStream = response.getOutputStream();
        workbook.write(outputStream);
        outputStream.flush();
        outputStream.close();
        workbook.close();
    }

导出Excel表格：