Java输出文件流

需求是，输出一个文件给另一个团队，然后他们来定期拉取数据

 public ResponseEntity<byte[]> topicRank() {
        try {
            ByteArrayOutputStream baos = new ByteArrayOutputStream();
            String filename = "topic_rank";
            LinkedMultiValueMap<String, String> headers = new LinkedMultiValueMap<>();
            headers.add("Content-Type", "application/text");
            headers.add("Content-Disposition", "attachment;filename=" + new String(filename.getBytes("GBK"), "iso8859-1")+".xlsx");
            //获取对应的数据信息，转换成string
            String topicRank = hotelBangdanService.getHotelBangdanData(0L, "", 1);
            baos.write(topicRank.getBytes(), 0, topicRank.getBytes().length);
            return new ResponseEntity(baos.toByteArray(), headers, HttpStatus.OK);
        } catch (Exception ex) {
            return null;
        }
    }