Export of zip file

@PostMapping("/download/batch")
    @ApiOperation(" Bulk download PDF")
    @Export(type = "zip", defaultFileName = " Tax payment certificate ")
    @MenuAuth
    public void downloadBatch(@RequestBody ReceiptDownLoadRequest receiptDownLoadRequest,
                              HttpServletRequest request,
                              HttpServletResponse response) {
        String recordIds = receiptDownLoadRequest.getRecordIds();
        List<Long> ids = Arrays.stream(recordIds.split(BaseConstant.COMMA))
                .map(Long::parseLong).collect(
                        Collectors.toList());
        List<ReceiptPO> receipts = receitService.getReceipts(ids);
        if (CollectionUtils.isEmpty(receipts)) {
            // The query data is empty 
            throw new BizException(ResponseMsgEnum.QUERY_NOT_EXSIST);
        }
        try (BufferedOutputStream bos = new BufferedOutputStream(response.getOutputStream());
                ZipOutputStream out = new ZipOutputStream(bos);
        ) {
            byte[] buf = new byte[1024];
            // Deal with the file name problem when the company name is consistent 
            dealWithSomeCompanyName(receipts);
            for (ReceiptPO receipt : receipts) {
                ByteArrayInputStream in = new ByteArrayInputStream(receipt.getFile());
                //  Name the files in the list separately 
                out.putNextEntry(new ZipEntry(receipt.getCompanyName() + ".pdf"));
                int len;
                while ((len = in.read(buf)) > 0) {
                    out.write(buf, 0, len);
                }
                out.closeEntry();
                in.close();
            }
        } catch (Exception exception) {
            log.error(" Failed to export compressed file ", exception);
            throw new BizException(ResponseMsgEnum.FILE_DOWNLOAD_ERROR);
        }
    }

private void dealWithSomeCompanyName(List<ReceiptPO> receipts) {
        // Sort by company name 
        receipts = receipts.stream().sorted(Comparator.comparing(ReceiptPO::getCompanyName))
                .collect(Collectors.toList());
        HashMap<String, ReceiptPO> map = new HashMap<>();
        int repeat = 0;
        for (ReceiptPO receipt : receipts) {
            ReceiptPO receiptPoByMap = map.get(receipt.getCompanyName());
            if (Objects.isNull(receiptPoByMap)) {
                // Blank indicates that there is no duplicate company name 
                boolean contains = map.containsKey(receipt.getCompanyName());
                if (!contains) {
                    // The company name does not exist, and there are key in , Then it means that there is a second duplicate company , Value reset calculation 
                    repeat = 0;
                }
                map.put(receipt.getCompanyName(), receipt);
            } else {
                // Duplicate companies 
                repeat++;
                String companyName = receipt.getCompanyName() + "(" + repeat + ")";
                receipt.setCompanyName(companyName);
            }
        }


    }

zip File export