SpringBoot：实现异步(Async)接口

矫情吗；* 2022-12-08 05:08 415阅读 0赞

##### 1. 启动类引入@EnableAsync注解 #####

@SpringBootApplication  
    @EnableAsync  
    public class Application{   
      
        public static void main(String[] args) {   
            SpringApplication.run(Application.class, args);  
        }  
    }

##### 2. 建立异步任务类 #####

我们建了3个异步任务，分别延迟1s，2s，3s

@Component
    public class AsyncTask { 
    
        @Async
        public void task1() throws InterruptedException{ 
            long currentTimeMillis = System.currentTimeMillis();
            Thread.sleep(1000);
            long currentTimeMillis1 = System.currentTimeMillis();
            System.out.println("task1任务耗时:"+(currentTimeMillis1-currentTimeMillis)+"ms");
        }
    
        @Async
        public void task2() throws InterruptedException{ 
            long currentTimeMillis = System.currentTimeMillis();
            Thread.sleep(2000);
            long currentTimeMillis1 = System.currentTimeMillis();
            System.out.println("task2任务耗时:"+(currentTimeMillis1-currentTimeMillis)+"ms");
        }
        @Async
        public void task3() throws InterruptedException{ 
            long currentTimeMillis = System.currentTimeMillis();
            Thread.sleep(3000);
            long currentTimeMillis1 = System.currentTimeMillis();
            System.out.println("task3任务耗时:"+(currentTimeMillis1-currentTimeMillis)+"ms");
        }
    }

##### 3. 建立测试接口 #####

@RestController
    @RequestMapping("/test")
    public class TestController { 
    
    
        @Autowired
        private AsyncTask asyncTask;
    
        @RequestMapping("/async")
        public String doTask() throws InterruptedException{ 
            long currentTimeMillis = System.currentTimeMillis();
            asyncTask.task1();
            asyncTask.task2();
            asyncTask.task3();
            long currentTimeMillis1 = System.currentTimeMillis();
            return "task任务总耗时:"+(currentTimeMillis1-currentTimeMillis)+"ms";
        }
    }

启动SpringBoot服务，访问`/test/async`接口，能看到任务耗时只有1s  
![在这里插入图片描述][20200918091104969.png_pic_center]  
查看控制台，发现异步task也成功执行了！  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2x0MzI2MDMwNDM0_size_16_color_FFFFFF_t_70_pic_center]

[20200918091104969.png_pic_center]: /images/20221123/0c2f4d526b5b4b5b953583c63f221e09.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2x0MzI2MDMwNDM0_size_16_color_FFFFFF_t_70_pic_center]: /images/20221123/073521acd02d41af9521a889c1ec0022.png