关键点在于，多次复用模板流，InputStream只能读取一次，先copy到ByteArrayOutputStream，
    获取byte数组，写到ByteArrayInputStream中，之后每次循环生成一个excel后对stream进行reset，
    这样就可以实现模板流复用，另外excel生成写入到ZipOutputStream后也可以reset复用。

    1. private ExportResultDTO exportZip(Map<String, List<ExcelData>> outMap) {
    2.     try (InputStream templateStream = awss3Util.getTemplateAsInputStream(TEMPLATE_NAME);
    3.          ByteArrayOutputStream templateStreamOut = new ByteArrayOutputStream();
    4.          ByteArrayOutputStream excelOut = new ByteArrayOutputStream();
    5.          ByteArrayOutputStream zipOut = new ByteArrayOutputStream();
    6.          ZipOutputStream zipOutputStream = new ZipOutputStream(zipOut)) {
    7.         IOUtils.copy(templateStream, templateStreamOut);
    8.         byte[] bytes = templateStreamOut.toByteArray();
    9.         try (ByteArrayInputStream templateByteInputStream = new ByteArrayInputStream(bytes)) {
    10.             for (Map.Entry<String, List<ExcelData>> entry : outMap.entrySet()) {
    11.                 String excelName = entry.getKey();
    12.                 List<ExcelData> dataList = entry.getValue();
    13.                 writerStreamByTemplate(excelOut, templateByteInputStream, dataList);
    14.                 zipOutputStream.putNextEntry(new ZipEntry(excelName));
    15.                 zipOutputStream.write(excelOut.toByteArray());
    16.                 templateByteInputStream.reset();
    17.                 excelOut.reset();
    18.             }
    19.         }
    20.         templateStream.close();
    21.         templateStreamOut.close();
    22.         excelOut.close();
    23.         zipOutputStream.flush();
    24.         zipOutputStream.close();
    25.         String key = redisUtil.getIncrementKey();
    26.         awss3Util.putBytesToDefBucket(key, zipOut.toByteArray());
    27.         zipOut.close();
    28.         return ExportResultDTO.builder()
    29.             .s3ObjectKey(key)
    30.             .s3ObjectBucket(AWSS3Util.AWS_S3_BUCKET_DEFAULT)
    31.             .contentType("application/zip")
    32.             .filename("excel.zip")
    33.             .build();
    34.     } catch (Exception e) {
    35.         log.error(e.getMessage(), e);
    36.         throw new RuntimeException("Export excel failed.", e);
    37.     }
    38. }
    40. private void writerStreamByTemplate(OutputStream outputStream, InputStream templateStream, List<LGGIOSSManifest2021DTO> dataList) {
    41.     ExcelWriter excelWriter = EasyExcel.write(outputStream)
    42.         .withTemplate(templateStream)
    43.         .build();
    44.     WriteSheet writeSheet = EasyExcel.writerSheet().build();
    45.     excelWriter.fill(dataList, writeSheet);
    46.     excelWriter.finish();
    47.     }