springboot 计划任务Scheduled

package com.shrimpking;

import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Service;

import java.text.SimpleDateFormat;
import java.util.Date;

/**
 * Created by IntelliJ IDEA.
 *
 * @Author : Shrimpking
 * @create 2023/6/8 12:46
 * @Scheduled声明该方法是计划任务，
 * 使用fixedRate属性每隔固定时间执行。
 */
@Service
public class ScheduleDemo
{
    private static final SimpleDateFormat DATE_FORMAT
            = new SimpleDateFormat("HH:mm:ss");


    @Scheduled(fixedRate = 5000)
    public void getCurrentTime()
    {
        System.out.println("间隔5秒执行一次："   DATE_FORMAT.format(new Date()));
    }

    /**
     * cron属性可按照指定时间执行，
     * 本例指的是每天12点57分执行；
     * cron是UNIX和类UNIX（Linux）系统下的定时任务。
     */
    @Scheduled(cron = "0 57 12 * * *")
    public void fixTimeExecute()
    {
        System.out.println("在指定时间 "   DATE_FORMAT.format(new Date()));
    }
}

package com.shrimpking;

import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.scheduling.annotation.EnableScheduling;

/**
 * Created by IntelliJ IDEA.
 *
 * @Author : Shrimpking
 * @create 2023/6/8 12:51
 * @EnableScheduling注解开启对计划任务的支持。
 */
@Configuration
@ComponentScan("com.shrimpking")
@EnableScheduling
public class ScheduleConfig
{
}

package com.shrimpking;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;

@SpringBootApplication
public class Springboot49ScheduleApplication
{

    public static void main(String[] args)
    {
        //SpringApplication.run(Springboot49ScheduleApplication.class, args);
        AnnotationConfigApplicationContext context
                = new AnnotationConfigApplicationContext(ScheduleConfig.class);
    }

}