Spring Boot异步控制器

Question

I have this post method:

 @PostMapping("/upload")
        public String singleFileUpload(@RequestParam("file") MultipartFile file,RedirectAttributes redirectAttributes)
                throws IOException {
    ExecutorService service= Executors.newSingleThreadExecutor();
            Future<String> future=service.submit(new Callable<String>() {
                @Override
                public String call() throws Exception {
                    //parse file
                    Thread.sleep(5000);
                    return "done";
                }
            });
    String result=future.get();
     service.shutdown();
    return "redirect:uploadState";
    }

I want to redirect to uploadState while executor parse my file and uploadState have long polling ajax to notify if parsing is done or not.Can help me with some hints.

Answer 1

Here future.get() is blocker.

You can use Java 8 CompletableFuture :

CompletableFuture.supplyAsync(() -> {
    try{
   Thread.sleep(5000);
   return "done";
 }catch(Exception ex){}
}).thenApply((res->)->{
  return res;
});

It will not block your control.