我了解异步服务的一些概念，但还没有编写过很多代码，因此特别是java中的机制对我来说是新的。基本上，我有一个长期运行的服务，我想分岔到另一个线程，并能够使用不同的服务检查它的状态。现在，我可以开始工作了，我还没有办法检查。但更糟糕的是：
在邮局 asyncUploadSoftLayerFile 下:

@RestController
@RequestMapping("/")
public class MyController {
   ...
    @ResponseStatus(HttpStatus.CREATED)
    @PostMapping("/async-files")
    public DeferredResult<ResponseEntity<JobExecutionResult>>       asyncUploadSoftLayerFile(@RequestParam MultipartFile file) throws JobParametersInvalidException, JobExecutionAlreadyRunningException, JobRestartException, JobInstanceAlreadyCompleteException, IOException, JobExecutionAlreadyRunningException{
        logger.info("Received async-CompleteableFuture request");
        DeferredResult<ResponseEntity<JobExecutionResult>> output = new DeferredResult<ResponseEntity<JobExecutionResult>>();
        ForkJoinPool.commonPool().submit(() -> {
            logger.info("Processing in separate thread: Thread-ID="+Thread.currentThread().getId());

            JobExecutionResult jobExecutionResult = null;
            try {
                myReallyLongRunningProcess();
            } catch (JobParametersInvalidException | JobExecutionAlreadyRunningException | JobRestartException
                    | JobInstanceAlreadyCompleteException | IOException e) {
                logger.error("Error processing /async-files upload in Thread-ID: "+Thread.currentThread().getId(),e);
                throw new RuntimeException(e);
            }
            if (!"COMPLETED".equals(jobExecutionResult.getExitStatus())) {
                throw new UploadFileException(file.getOriginalFilename() + " exit status: " + jobExecutionResult.getExitStatus());
            }
            ResponseEntity<JobExecutionResult> responseEntity = ResponseEntity.ok(jobExecutionResult);
            output.setResult(responseEntity);
        });

        return output;
    }
}

spring确实做了延迟的事情，我可以看到它将工作转移到了另一个线程。但它并没有返回给打电话的人。相反，我看到：

2021-07-27 05:20:00 DEBUG o.s.web.servlet.DispatcherServlet - Exiting but response remains open for further handling

所以它只是部分地满足了我的需求。我如何让spring将工作转移到另一个线程（理想情况下能够通过另一个web服务调用引用该进程），但立即向web浏览器返回某种响应？
这是开始工作的一部分，但要跟踪完成的百分比。