Java SpringBoot Scheduled定时任务

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";
    }
}

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);
    }
}