time:
??cron:?*/5?*?*?*?*?*
??interval:?5

????@Scheduled(cron="${time.cron}")
????void?testPlaceholder1()?{
????????System.out.println("Execute?at?"?+?System.currentTimeMillis());
????}

????@Scheduled(cron="*/${time.interval}?*?*?*?*?*")
????void?testPlaceholder2()?{
????????System.out.println("Execute?at?"?+?System.currentTimeMillis());
????}

@Scheduled(fixedDelay?=?5000)?//上一次執(zhí)行完畢時間點之后5秒再執(zhí)行

@Scheduled(fixedDelayString?=?"5000")?//上一次執(zhí)行完畢時間點之后5秒再執(zhí)行

????@Scheduled(fixedDelayString?=?"${time.fixedDelay}")
????void?testFixedDelayString()?{
????????System.out.println("Execute?at?"?+?System.currentTimeMillis());
????}

@Scheduled(fixedRate?=?5000)?//上一次開始執(zhí)行時間點之后5秒再執(zhí)行

@Scheduled(initialDelay=1000,?fixedRate=5000)?//第一次延遲1秒后執(zhí)行，之后按fixedRate的規(guī)則每5秒執(zhí)行一次

/**
?*?An?annotation?that?marks?a?method?to?be?scheduled.?Exactly?one?of
?*?the?{@link?#cron()},?{@link?#fixedDelay()},?or?{@link?#fixedRate()}
?*?attributes?must?be?specified.
?*
?*?
The?annotated?method?must?expect?no?arguments.?It?will?typically?have
?*?a?{@code?void}?return?type;?if?not,?the?returned?value?will?be?ignored
?*?when?called?through?the?scheduler.
?*
?*?
Processing?of?{@code?@Scheduled}?annotations?is?performed?by
?*?registering?a?{@link?ScheduledAnnotationBeanPostProcessor}.?This?can?be
?*?done?manually?or,?more?conveniently,?through?the?{@code?}
?*?element?or?@{@link?EnableScheduling}?annotation.
?*
?*?
This?annotation?may?be?used?as?a?meta-annotation?to?create?custom
?*?composed?annotations?with?attribute?overrides.
?*
?*?@author?Mark?Fisher
?*?@author?Dave?Syer
?*?@author?Chris?Beams
?*?@since?3.0
?*?@see?EnableScheduling
?*?@see?ScheduledAnnotationBeanPostProcessor
?*?@see?Schedules
?*/
@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?"";

}