springboot簡單異步任務Async

啓動類 

@EnableAsync

異步任務 

 @Component 掃描組件

  @Async 告訴springboot 這是個異步任務

創建四個 異步任務   這裏打印出異步執行時間

@Component
public class AsyncTask {
    @Async
    public Future<Boolean> myAsyncTask1()throws Exception{
        long startTime = System.currentTimeMillis();
        Thread.sleep(1000);
        long endTime = System.currentTimeMillis();
        System.out.println("任務①耗時"+(endTime-startTime)+"毫秒");
        return  new AsyncResult<>(true);
    }
    @Async
    public Future<Boolean> myAsyncTask2()throws Exception{
        long startTime = System.currentTimeMillis();
        Thread.sleep(1500);
        long endTime = System.currentTimeMillis();
        System.out.println("任務②耗時"+(endTime-startTime)+"毫秒");
        return  new AsyncResult<>(true);
    }
    @Async
    public Future<Boolean> myAsyncTask3()throws Exception{
        long startTime = System.currentTimeMillis();
        Thread.sleep(600);
        long endTime = System.currentTimeMillis();
        System.out.println("任務③耗時"+(endTime-startTime)+"毫秒");
        return  new AsyncResult<>(true);
    }
    @Async
    public Future<Boolean> myAsyncTask4()throws Exception{
        long startTime = System.currentTimeMillis();
        Thread.sleep(700);
        long endTime = System.currentTimeMillis();
        System.out.println("任務④耗時"+(endTime-startTime)+"毫秒");
        return  new AsyncResult<>(true);
    }
}

 調用

@RestController
@RequestMapping("/async")
public class AsyncController {

    @Autowired
    AsyncTask task;

    @RequestMapping("/myAsync")
    public String myAsync() throws Exception {
        StringBuffer buffer = new StringBuffer("異步執行任務總耗時爲：");
        long startTime = System.currentTimeMillis();
        Future<Boolean> async1 = task.myAsyncTask1();
        Future<Boolean> async2 = task.myAsyncTask2();
        Future<Boolean> async3 = task.myAsyncTask3();
        Future<Boolean> async4 = task.myAsyncTask4();
        while (!async1.isDone() || !async2.isDone() ||
                !async3.isDone() || !async4.isDone()) {
            if (!async1.isDone() && !async2.isDone() && !async3.isDone() && !async4.isDone()) {
                break;
            }
        }
        long endTime = System.currentTimeMillis();
        buffer.append((endTime - startTime));
        buffer.append("毫秒");
        System.out.println(buffer);
        return buffer.toString();
    }


}