@Component
public class Task {

  //定义一个随机对象.
  public static Random random =new Random();

  @Async //加入"异步调用"注解
  public void doTaskOne() throws InterruptedException {
    System.out.println("开始执行任务一");
    long start = System.currentTimeMillis();
    Thread.sleep(random.nextInt(10000));
    long end = System.currentTimeMillis();
    System.out.println("完成任务一，耗时：" + (end - start) + "毫秒");
  }

  @Async
  public void doTaskTwo() throws InterruptedException {
    System.out.println("开始执行任务二");
    long start = System.currentTimeMillis();
    Thread.sleep(random.nextInt(10000));
    long end = System.currentTimeMillis();
    System.out.println("完成任务二，耗时：" + (end - start) + "毫秒");
  }

  @Async
  public void doTaaskThree() throws InterruptedException {
    System.out.println("开始执行任务三");
    long start = System.currentTimeMillis();
    Thread.sleep(random.nextInt(10000));
    long end = System.currentTimeMillis();
    System.out.println("完成任务三，耗时：" + (end - start) + "毫秒");
  }
}

@Controller
public class TaskController {

  @Autowired
  private Task TASK;

  @ResponseBody
  @RequestMapping("/task")
  public String task() throws Exception {
    System.out.println("开始执行Controller任务");
    long start = System.currentTimeMillis();
    TASK.doTaskOne();
    TASK.doTaskTwo();
    TASK.doTaaskThree();
    long end = System.currentTimeMillis();
    System.out.println("完成Controller任务，耗时：" + (end - start) + "毫秒");
    return "success";
  }
}