该参数接收一个cron表达式，cron表达式是一个字符串，字符串以5或6个空格隔开，分开共6或7个域，每一个域代表一个含义。

注：[年]不是必须的域，可以省略[年]，则一共6个域

每隔5秒执行一次：*/5 * * * * ?

每隔1分钟执行一次：0 */1 * * * ?

每天23点执行一次：0 0 23 * * ?

每天凌晨1点执行一次：0 0 1 * * ?

每月1号凌晨1点执行一次：0 0 1 1 * ?

每月最后一天23点执行一次：0 0 23 L * ?

每周星期天凌晨1点实行一次：0 0 1 ? * L

在26分、29分、33分执行一次：0 26,29,33 * * * ?

每天的0点、13点、18点、21点都执行一次：0 0 0,13,18,21 * * ?

另外，cron属性接收的cron表达式支持占位符。eg：

配置文件：

每5秒执行一次：

时区，接收一个java.util.TimeZone#ID。cron表达式会基于该时区解析。默认是一个空字符串，即取服务器所在地的时区。比如我们一般使用的时区Asia/Shanghai。该字段我们一般留空。

上一次执行完毕时间点之后多长时间再执行。如：

与 3. fixedDelay 意思相同，只是使用字符串的形式。唯一不同的是支持占位符。如：

占位符的使用(配置文件中有配置：time.fixedDelay=5000)：

运行结果：

上一次开始执行时间点之后多长时间再执行。如：

与 5. fixedRate 意思相同，只是使用字符串的形式。唯一不同的是支持占位符。

第一次延迟多长时间后再执行。如：

与 7. initialDelay 意思相同，只是使用字符串的形式。唯一不同的是支持占位符。

That's all ! Thanks for reading.

截至spring-context-4.3.14.RELEASE的源码

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 ""; }