EasyExcel fills export based on template

1. Template

Two, the code

@PostMapping("/monitoring-record-export")
    @RequestLog("体征监测记录导出")
    @ApiOperation(value = "体征监测记录导出")
    public void monitoringRecordExport(@RequestBody MonitoringRecordExportReq req, HttpServletResponse response) throws IOException {
        List<MonitoringRecordExportRep> repList = infectiousDiseaseReportService.monitoringRecordExport(req);
        //读取模板
        ClassPathResource classPathResource = new ClassPathResource("template/health-monitoring-template.xlsx");
        InputStream inputStream = classPathResource.getInputStream();
        log.info("获取模板={}", inputStream);
        //创建一个工作薄对象
        ExcelWriter workBook = null;
        List<String> sheetNames = new ArrayList<>();
        try (ServletOutputStream os = response.getOutputStream()) {
            response.setCharacterEncoding("UTF-8");
            response.setContentType("application/octet-stream;charset=UTF-8");
            final String encodeFileName = URLEncoder.encode("体征监测记录" + ".xlsx", "UTF-8");
            response.setHeader("Content-Disposition", String.format("attachment;filename=%s", encodeFileName));
            Map<String, Integer> nameMap = new HashMap<String, Integer>();
            for (MonitoringRecordExportRep monitoringRecordExportRep : repList) {
                String sheetName;
                if (nameMap.containsKey(monitoringRecordExportRep.getUserName())) {
                    sheetName = monitoringRecordExportRep.getUserName() + "+" + monitoringRecordExportRep.getNationalityName() + "(" + nameMap.get(monitoringRecordExportRep.getUserName()) + ")";
                    nameMap.put(monitoringRecordExportRep.getUserName(), Objects.isNull(nameMap.get(monitoringRecordExportRep.getUserName())) ? 1 : nameMap.get(monitoringRecordExportRep.getUserName()) + 1);
                } else {
                    sheetName = monitoringRecordExportRep.getUserName() + "+" + monitoringRecordExportRep.getNationalityName();
                    nameMap.put(monitoringRecordExportRep.getUserName(), Objects.isNull(nameMap.get(monitoringRecordExportRep.getUserName())) ? 1 : nameMap.get(monitoringRecordExportRep.getUserName()) + 1);
                }
                sheetNames.add(sheetName);
            }

            //原模板只有一个sheet，通过poi复制出需要的sheet个数的模板
            XSSFWorkbook xssfWorkbook = new XSSFWorkbook(inputStream);
            //循环表名
            if (CollectionUtil.isEmpty(sheetNames)){
                return;
            }
            for (String sheetName : sheetNames) {
            //第一参数是 以谁为模板，第二个参数是复制出来的模板名
                xssfWorkbook.cloneSheet(0, sheetName);
            }
            //写到流里
            ByteArrayOutputStream bos = new ByteArrayOutputStream();
            xssfWorkbook.write(bos);
            byte[] bArray = bos.toByteArray();
            InputStream is = new ByteArrayInputStream(bArray);

            //创建一个工作薄对象
            workBook = EasyExcel.write(os).withTemplate(is).excelType(ExcelTypeEnum.XLSX).build();
            //开启多组之间换行
            FillConfig fillConfig = FillConfig.builder().forceNewRow(true).build();
            //创建工作表对象
            if (!CollectionUtil.isEmpty(sheetNames)) {
                for (int i = 0; i < sheetNames.size(); i++) {
                    //插入数据
                    //插入用户基本信息数据
                    log.info("sheetName={}", sheetNames.get(i));
                    WriteSheet writeSheet = EasyExcel.writerSheet(i+1).build();
                    workBook.fill(repList.get(i), writeSheet);
                    // 如果有多个list 模板上必须有{前缀.} 这里的前缀就是 a，然后多个list必须用 FillWrapper包裹
                    //多组填充 体征打卡信息
                    workBook.fill(new FillWrapper("a", repList.get(i).getPhysicalSignPunch()), fillConfig, writeSheet);
                    //多组填充 病情记录
                    workBook.fill(new FillWrapper("b",repList.get(i).getPathography()), fillConfig,writeSheet);
                }
            }

            // 千万别忘记关闭流
            is.close();
            if (workBook != null) {
                workBook.finish();
            }
        } catch (Exception e) {
            throw new BizException("导出问卷数据失败", e);
        }
    }

result