@异步在spring中不起作用

我有一个spring boot应用程序，希望通过使用@Async注释来运行一个简单的异步后台任务，但是，这似乎不起作用（没有创建新线程，我在每次调用函数后等待睡眠结束）。。 *****我的配置类：**

@Configuration
@EnableAsync
public class AsyncConfig {

}

****我的控制器：**

 @GetMapping(value = "/testAsync")
    @ResponseBody
    public String testAsync() {

        TestClass testClass = new TestClass();
        System.out.println("begin of test async dates is : " + new Date());

        for (int i = 0; i < 5; i++) {

            testClass.asyncMethod();
        }
        System.out.println("end of test async  dates is : " + new Date());

        return "end!";
    }

****运行应用程序后的输出：**

begin of test async dates is : Sat Jul 14 19:35:43 EET 2018
Execute method asynchronously. in thread : http-nio-8080-exec-1
after sleep : http-nio-8080-exec-1
Execute method asynchronously. in thread : http-nio-8080-exec-1
after sleep : http-nio-8080-exec-1
Execute method asynchronously. in thread : http-nio-8080-exec-1
after sleep : http-nio-8080-exec-1
Execute method asynchronously. in thread : http-nio-8080-exec-1
2018-07-14 19:36:22.299  INFO 3120 --- [MessageBroker-1] o.s.w.s.c.WebSocketMessageBrokerStats    : WebSocketSession[0 current WS(0)-HttpStream(0)-HttpPoll(0), 0 total, 0 closed abnormally (0 connect failure, 0 send limit, 0 transport error)], stompSubProtocol[processed CONNECT(0)-CONNECTED(0)-DISCONNECT(0)], stompBrokerRelay[null], inboundChannel[pool size = 0, active threads = 0, queued tasks = 0, completed tasks = 0], outboundChannelpool size = 0, active threads = 0, queued tasks = 0, completed tasks = 0], sockJsScheduler[pool size = 1, active threads = 1, queued tasks = 0, completed tasks = 0]
after sleep : http-nio-8080-exec-1
Execute method asynchronously. in thread : http-nio-8080-exec-1
after sleep : http-nio-8080-exec-1
end of test async  dates is : Sat Jul 14 19:36:33 EET 2018

****注:** -我尝试过用@Component注释TestClass，但它不起作用 -我尝试在应用程序级别和方法级别添加执行器，但得到的结果相同

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请帮帮我，我已经花了5个小时在这上面，但运气不好

将TestClass自动关联到控制器中，使用TestClass类型创建控制器的实例成员，并为其提供Autowire注释

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当您自己实例化它时，Spring不知道异步注释，对它的调用将在调用线程中运行。

非常感谢，它工作得很疯狂！感谢您无数次！

begin of test async dates is : Sat Jul 14 19:35:43 EET 2018
Execute method asynchronously. in thread : http-nio-8080-exec-1
after sleep : http-nio-8080-exec-1
Execute method asynchronously. in thread : http-nio-8080-exec-1
after sleep : http-nio-8080-exec-1
Execute method asynchronously. in thread : http-nio-8080-exec-1
after sleep : http-nio-8080-exec-1
Execute method asynchronously. in thread : http-nio-8080-exec-1
2018-07-14 19:36:22.299  INFO 3120 --- [MessageBroker-1] o.s.w.s.c.WebSocketMessageBrokerStats    : WebSocketSession[0 current WS(0)-HttpStream(0)-HttpPoll(0), 0 total, 0 closed abnormally (0 connect failure, 0 send limit, 0 transport error)], stompSubProtocol[processed CONNECT(0)-CONNECTED(0)-DISCONNECT(0)], stompBrokerRelay[null], inboundChannel[pool size = 0, active threads = 0, queued tasks = 0, completed tasks = 0], outboundChannelpool size = 0, active threads = 0, queued tasks = 0, completed tasks = 0], sockJsScheduler[pool size = 1, active threads = 1, queued tasks = 0, completed tasks = 0]
after sleep : http-nio-8080-exec-1
Execute method asynchronously. in thread : http-nio-8080-exec-1
after sleep : http-nio-8080-exec-1
end of test async  dates is : Sat Jul 14 19:36:33 EET 2018