```
@Target({METHOD,ANNOTATION_TYPE})
@Retention(RUNTIME)
@Documented
@Repeatable(Schedules.class)
public @interface Scheduled
```
An annotation that marks a method to be scheduled. Exactly one of the cron(), fixedDelay(), or fixedRate() attributes must be specified.
The annotated method must expect no arguments. It will typically have a void return type; if not, the returned value will be ignored when called through the scheduler.
Processing of @Scheduled annotations is performed by registering a ScheduledAnnotationBeanPostProcessor. This can be done manually or, more conveniently, through the <task:annotation-driven/> element or @EnableScheduling annotation.
This annotation may be used as a meta-annotation to create custom composed annotations with attribute overrides.
从以下版本开始:
3.0
作者:
Mark Fisher, Juergen Hoeller, Dave Syer, Chris Beams
另请参阅:
EnableScheduling, ScheduledAnnotationBeanPostProcessor, Schedules

可选元素概要

可选元素
修饰符和类型	可选元素	说明
`String`	`cron`	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.
`long`	`fixedDelay`	Execute the annotated method with a fixed period in milliseconds between the end of the last invocation and the start of the next.
`String`	`fixedDelayString`	Execute the annotated method with a fixed period in milliseconds between the end of the last invocation and the start of the next.
`long`	`fixedRate`	Execute the annotated method with a fixed period in milliseconds between invocations.
`String`	`fixedRateString`	Execute the annotated method with a fixed period in milliseconds between invocations.
`long`	`initialDelay`	Number of milliseconds to delay before the first execution of a `fixedRate()` or `fixedDelay()` task.
`String`	`initialDelayString`	Number of milliseconds to delay before the first execution of a `fixedRate()` or `fixedDelay()` task.
`String`	`zone`	A time zone for which the cron expression will be resolved.

- 元素详细资料
  - cron
```
String cron
```
    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. "0 * * * * MON-FRI" means once per minute on weekdays (at the top of the minute - the 0th second).
    返回:
    an expression that can be parsed to a cron schedule
    另请参阅:
    CronSequenceGenerator
    默认值:
    ""
- - zone
```
String zone
```
    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).
    返回:
    a zone id accepted by TimeZone.getTimeZone(String), or an empty String to indicate the server's default time zone
    从以下版本开始:
    4.0
    另请参阅:
    CronTrigger(String, java.util.TimeZone), TimeZone
    默认值:
    ""
- - fixedDelay
```
long fixedDelay
```
    Execute the annotated method with a fixed period in milliseconds between the end of the last invocation and the start of the next.
    返回:
    the delay in milliseconds
    默认值:
    -1L
- - fixedDelayString
```
String fixedDelayString
```
    Execute the annotated method with a fixed period in milliseconds between the end of the last invocation and the start of the next.
    返回:
    the delay in milliseconds as a String value, e.g. a placeholder
    从以下版本开始:
    3.2.2
    默认值:
    ""
- - fixedRate
```
long fixedRate
```
    Execute the annotated method with a fixed period in milliseconds between invocations.
    返回:
    the period in milliseconds
    默认值:
    -1L
- - fixedRateString
```
String fixedRateString
```
    Execute the annotated method with a fixed period in milliseconds between invocations.
    返回:
    the period in milliseconds as a String value, e.g. a placeholder
    从以下版本开始:
    3.2.2
    默认值:
    ""
- - initialDelay
```
long initialDelay
```
    Number of milliseconds to delay before the first execution of a fixedRate() or fixedDelay() task.
    返回:
    the initial delay in milliseconds
    从以下版本开始:
    3.2
    默认值:
    -1L
- - initialDelayString
```
String initialDelayString
```
    Number of milliseconds to delay before the first execution of a fixedRate() or fixedDelay() task.
    返回:
    the initial delay in milliseconds as a String value, e.g. a placeholder
    从以下版本开始:
    3.2.2
    默认值:
    ""

注释类型 Scheduled

可选元素概要

元素详细资料

cron

zone

fixedDelay

fixedDelayString

fixedRate

fixedRateString

initialDelay

initialDelayString