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1 在.xml配置文件中引入命名空间
xmlns:task="http://www.springframework.org/schema/task"
http://www.springframework.org/schema/task
http://www.springframework.org/schema/task/spring-task-3.0.xsd"2 设置自动发现
<task:annotation-driven/> 3 在需要定时执行的方法上加上@Scheduled注解，一个实例如下：
@Service
public class AreaCacheService implements InitializingBean {
Ehcache areaCache;
@Override
public void afterPropertiesSet() throws Exception {
refresh();
}
@Scheduled(fixedDelay = 1000, initialDelay = 1000)
public void refresh() {
SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd HH:mm:ss");
System.out.println(sdf.format(new Date()) + ": refresh cache...");
}
}以上例子让方法每次执行后都间隔一秒继续执行，执行结果如下：
20160820 17:54:47: refresh cache…
20160820 17:54:48: refresh cache…
20160820 17:54:49: refresh cache…
20160820 17:54:50: refresh cache…
20160820 17:54:51: refresh cache…
20160820 17:54:52: refresh cache…
注意：
Exactly one of the ‘cron’, ‘fixedDelay(String)’, or ‘fixedRate(String)’ attributes is required
(cron, fixdDelay, fixedRate三个属性必须设置一个)
属性含义：
| 属性 | 解释 |
|---|---|
| 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. |
| fixedDelay | Execute the annotated method with a fixed period in milliseconds between the end of the last invocation and the start of the next. |
| fixedDelayString | Execute the annotated method with a fixed period in milliseconds between the end of the last invocation and the start of the next. |
| fixedRate | Execute the annotated method with a fixed period in milliseconds between invocations. |
| fixedRateString | Execute the annotated method with a fixed period in milliseconds between invocations. |
| initialDelay | Number of milliseconds to delay before the first execution of a fixedRate() or fixedDelay() task. |
| initialDelayString | Number of milliseconds to delay before the first execution of a fixedRate() or fixedDelay() task. |
| zone | A time zone for which the cron expression will be resolved. |
也可以用配置文件来配置定时任务：
<task:scheduled-tasks>
<task:scheduled ref="taskJob" method="job1" cron="0 * * * * ?"/>
</task:scheduled-tasks> 其中taskJob是对应的javaBean，job1是要定时执行的方法。
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原文地址：http://blog.csdn.net/foreverling/article/details/52262666
