Java SpringBoot Scheduled定时任务

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package task.demo.controller;   import org.springframework.beans.factory.annotation.Autowired; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RestController; import task.demo.service.AsyncService;   import java.time.LocalDateTime; import java.time.format.DateTimeFormatter;   @RestController public class AsyncController {     @Autowired     AsyncService asyncService;       @RequestMapping("/hello")     public Object hello() {         //@EnableAsync  //注解方式开启异步支持         String date1 = LocalDateTime.now().format(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss"));         System.out.println(date1);         asyncService.hello();         String date2 = LocalDateTime.now().format(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss"));         System.out.println(date2);         return "success";     }       /**      *  定时任务      * @return      */     @RequestMapping("/scheduledHello")     public Object scheduledHello() {         //@EnableScheduling //注解方式开启定时任务支持         asyncService.scheduledHello();         return "scheduledHello";     } }

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package task.demo.service;   import org.springframework.scheduling.annotation.Async; import org.springframework.scheduling.annotation.Scheduled; import org.springframework.stereotype.Service;   import java.time.LocalDateTime; import java.time.format.DateTimeFormatter;   @Service public class AsyncService {       /**      * 异步任务      */     @Async     public void hello() {         try {             Thread.sleep(3000);         } catch (InterruptedException e) {             e.printStackTrace();         }         System.out.println("开始执行");     }       /**      * 定时任务  每两秒执行一次      * cron表达式在线生成 http://cron.qqe2.com/      * 秒 分 时 日 月 周      */     @Scheduled(cron = "0/2 * * * * *")     public void scheduledHello() {         String date1 = LocalDateTime.now().format(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss"));         System.out.println("定时任务执行了 " + date1);     } }