@SpringBootApplication
@EnableConfigurationProperties
@EnableAsync
public class Main {
    public static final Logger logger = LoggerFactory.getLogger(Main.class);
    public static void main(String[] args) {
        logger.info("Spring Boot Beginning ...");
        SpringApplication.run(Main.class, args);
    }
}
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Service类的方法上添加@async注解：
@Servicepublic class AsyncService {    @Async //@Async注解来声明一个或多个异步任务，可以加在方法或者类上，加在类上表示这整个类都是使用这个自定义线程池进行操作    public void aysncService(){        System.out.println("今天是大年初一！"+System.currentTimeMillis());        try {            Thread.sleep(10000);        }catch (Exception e){            e.printStackTrace();        }        System.out.println("祝大家虎年大吉！"+System.currentTimeMillis());    }}
controller：
@RestControllerpublic class AsyncController {    @Autowired    AsyncService asyncService;    @GetMapping("/async")    public String asyncmethod1(){        asyncService.aysncService();        return "async success"+System.currentTimeMillis();    }}
地址栏输入：
http://localhost:8081/share/async
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@Target({ElementType.METHOD, ElementType.ANNOTATION_TYPE})
@Retention(RetentionPolicy.RUNTIME)
@Documented
@Repeatable(Schedules.class)
public @interface Scheduled {
    /**
     * A cron-like expression, extending the usual UN*X definition to include
     * triggers on the second as well as minute, hour, day of month, month
     * and day of week.  e.g. {@code "0 * * * * MON-FRI"} means once per minute on
     * weekdays (at the top of the minute - the 0th second).
     * @return an expression that can be parsed to a cron schedule
     * @see org.springframework.scheduling.support.CronSequenceGenerator
     */
    String cron() default "";
    /**
     * A time zone for which the cron expression will be resolved. By default, this
     * attribute is the empty String (i.e. the server's local time zone will be used).
     * @return a zone id accepted by {@link java.util.TimeZone#getTimeZone(String)},
     * or an empty String to indicate the server's default time zone
     * @since 4.0
     * @see org.springframework.scheduling.support.CronTrigger#CronTrigger(String, java.util.TimeZone)
     * @see java.util.TimeZone
     */
    String zone() default "";
    /**
     * Execute the annotated method with a fixed period in milliseconds between the
     * end of the last invocation and the start of the next.
     * @return the delay in milliseconds
     */
    long fixedDelay() default -1;
    /**
     * Execute the annotated method with a fixed period in milliseconds between the
     * end of the last invocation and the start of the next.
     * @return the delay in milliseconds as a String value, e.g. a placeholder
     * @since 3.2.2
     */
    String fixedDelayString() default "";
    /**
     * Execute the annotated method with a fixed period in milliseconds between
     * invocations.
     * @return the period in milliseconds
     */
    long fixedRate() default -1;
    /**
     * Execute the annotated method with a fixed period in milliseconds between
     * invocations.
     * @return the period in milliseconds as a String value, e.g. a placeholder
     * @since 3.2.2
     */
    String fixedRateString() default "";
    /**
     * Number of milliseconds to delay before the first execution of a
     * {@link #fixedRate()} or {@link #fixedDelay()} task.
     * @return the initial delay in milliseconds
     * @since 3.2
     */
    long initialDelay() default -1;
    String initialDelayString() default "";
}
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[秒] [分] [小时] [日] [月] [周] [年] //但是这里的年不是必须的域，可以省略[年]，则一共6个域
second,minute,hour,day of month,month,day of week
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cron = "*/10 * * * * ?" //每隔10秒执行一次：
cron = "* * * * * 0-7" //周一到周天每天每时每分每秒都执行一次
cron = "0-4 * * * * 0-7" //周一到周天每天每时每分1-5秒每秒都执行一次
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@EnableScheduling //开启定时任务注解
public class SpringbootdemoApplication {
    private static final Logger logger = LoggerFactory.getLogger(SpringbootdemoApplication.class);
    public static void main(String[] args) {
        logger.info("===============项目启动了===============");
        SpringApplication.run(SpringbootdemoApplication.class, args);
        logger.info("===============启动成功了===============");
    }
}
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@RestController
public class SceduleController {
    @GetMapping("/say")
    @Scheduled(fixedDelay = 10000, initialDelay = 5000/*容器启动后延迟5秒后在执行一次定时器，以后每10秒再执行一次定时器*/)
    public String say(){
        System.out.println("你好"+System.currentTimeMillis());
        return "你好"+System.currentTimeMillis();
    }
    @GetMapping("/happynewyear")
    @Scheduled(cron = "0 18 16 * * ?"/*每天16点18执行一次*/)
    public String sayhappynewyear(){
        System.out.println("虎年大吉"+ LocalDateTime.now().format(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss")));
        return "虎年大吉"+LocalDateTime.now().format(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss"));
    }
}
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