Spring Boot和Dubbo微服务架构下，如何高效地将服务端生成的流文件返回给前端？

@Service
public class FileServiceImpl implements FileService {

    @Override
    public byte[] generateFile() {
        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
        try {
            // 文件生成逻辑，将文件内容写入outputStream
            // ...  例如：outputStream.write(someBytes);
        } catch (IOException e) {
            // 处理异常
            e.printStackTrace();
        }
        return outputStream.toByteArray();
    }
}

@RestController
public class FileController {

    @Autowired
    private FileService fileService;

    @GetMapping("/file")
    public void downloadFile(HttpServletResponse response) throws IOException {
        byte[] fileBytes = fileService.generateFile();

        response.setContentType("application/octet-stream");
        response.setHeader("Content-Disposition", "attachment; filename=\"downloaded_file.txt\""); // 设置文件名

        OutputStream out = response.getOutputStream();
        out.write(fileBytes);
        out.flush();
        out.close();
    }
}