springboot 异步回调

定义异步方法，使用Future<T>来返回异步调用的结果

    @Async
    public Future<String> firstTask() throws InterruptedException {
        System.out.println("开始做任务一");
        long start = System.currentTimeMillis();
        Thread.sleep(random.nextInt(10000));
        long end = System.currentTimeMillis();
        System.out.println("完成任务一，当前线程：" + Thread.currentThread().getName() + "，耗时：" + (end - start) + "毫秒");
        return new AsyncResult<>("任务一完成");
    }

    @Async
    public Future<String> secondTask() throws InterruptedException {
        System.out.println("开始做任务二");
        long start = System.currentTimeMillis();
        Thread.sleep(random.nextInt(10000));
        long end = System.currentTimeMillis();
        System.out.println("完成任务二，当前线程：" + Thread.currentThread().getName() + "，耗时：" + (end - start) + "毫秒");
        return new AsyncResult<>("任务二完成");
    }

    @Async
    public Future<String> thirdTask() throws InterruptedException {
        System.out.println("开始做任务三");
        long start = System.currentTimeMillis();
        Thread.sleep(random.nextInt(10000));
        long end = System.currentTimeMillis();
        System.out.println("完成任务三，当前线程：" + Thread.currentThread().getName() + "，耗时：" + (end - start) + "毫秒");
        return new AsyncResult<>("任务三完成");
    }

调用

@GetMapping("test-future")
    public void testFuture() {
        try {
            Future<String> result1 = asyncService.firstTask();
            Future<String> result2 = asyncService.secondTask();
            Future<String> result3 = asyncService.thirdTask();
            while (true) {
                if (result1.isDone() && result2.isDone() && result3.isDone()) {
                    System.out.println("执行异步回调");
                    break;
                }
            }
            System.out.println("异步回调结束");
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }

调用结果

开始做任务一
开始做任务二
开始做任务三
完成任务二，当前线程：task-2，耗时：896毫秒
完成任务一，当前线程：task-1，耗时：7448毫秒
完成任务三，当前线程：task-3，耗时：7901毫秒
执行异步回调
异步回调结束

代码：异步回调