为Spring @Scheduled提供时区？ [英] Provide time zone to Spring @Scheduled?

问题描述

如何为基于Spring的 @ Scheduled cron job？

How can I configure the time zone for a Spring based @Scheduled cron job?

背景：

我的工作每天执行一次，比如说下午2点，使用Spring的 @Scheduled 注释：

I have a job that executes once a day, say 2 PM, using Spring's @Scheduled annotation:

@Scheduled(cron = "0 0 14 * * *")
public void execute() {
    // do scheduled job
}

问题是不同服务器之间的下午2点不同，因为Spring使用 TimeZone.getDefault（） 内部。此外， JavaDoc TimeZone.getDefault（）声明：

The problem is that 2 PM differs between different servers, because Spring uses on TimeZone.getDefault() internally. Moreover, the JavaDoc of TimeZone.getDefault() states that:

获取此主机的默认TimeZone 。默认TimeZone的来源可能因实施而异。

Gets the default TimeZone for this host. The source of the default TimeZone may vary with implementation.

换句话说，时区未确定。它可能取决于JVM实现，服务器时区配置，服务器位置和/或其他未知因素。因此，cron作业在不同服务器上的不同时间触发，除非有办法明确设置应该使用哪个时区？

In other words, the time zone is not determined. It may depend on JVM implementation, server time zone configuration, server location, and / or other unknown factors. Consequently, the cron job triggers on different times on different servers, unless there is a way to explicitly set which time zone that should be used?

我使用的是Spring 3.2。 2。

I am using Spring 3.2.2.

更新

截至4月4日，Spring Jira问题 SPR-10456 已经解决。因此， @Scheduled 注释有一个新的区域属性正是出于此目的。

As of Spring 4, Spring Jira issue SPR-10456 has been resolved. Consequently, the @Scheduled annotation has a new zone attribute for exactly this purpose.

推荐答案

事实证明我无法使用 @Scheduled 注释，但我实施了解决方法。在 SchedulingConfigurer 的JavaDoc中声明：

It turned out that I could not use the @Scheduled annotation, but I implemented a work-around. In the JavaDoc of the SchedulingConfigurer it is stated that:

[SchedulingConfigurer is]通常用于设置在执行计划任务或注册计划时使用的特定TaskScheduler bean以编程方式执行任务，而不是使用@Scheduled注释的声明方法。

[SchedulingConfigurer is] Typically used for setting a specific TaskScheduler bean to be used when executing scheduled tasks or for registering scheduled tasks in a programmatic fashion as opposed to the declarative approach of using the @Scheduled annotation.

接下来，我更改了cron作业以实现 Runnable 界面，然后更新我的配置文件以实现 SchedulingConfigurer ，见下文：

Next, I changed the cron job to implement the Runnable interface and then updated my configuration file to implement the SchedulingConfigurer, see below:

@Configuration
@EnableScheduling
@ComponentScan("package.that.contains.the.runnable.job.bean")
public class JobConfiguration implements SchedulingConfigurer {

    private static final String cronExpression = "0 0 14 * * *";
    private static final String timeZone = "CET";

    @Autowired
    private Runnable cronJob;

    @Bean
    CronTrigger cronTrigger() {
        return new CronTrigger(cronExpression, TimeZone.getTimeZone(timeZone));
    }

    @Override
    public void configureTasks(ScheduledTaskRegistrar taskRegistrar) {
        taskRegistrar.addCronTask(new CronTask(job, cronTrigger()));
    }
}

请阅读@EnableScheduling 了解更多信息。

更新

截至Spring 4，Spring Jira问题 SPR-10456 已得到解决。因此， @Scheduled 注释有一个新的zone 属性就是为了这个目的。

As of Spring 4, Spring Jira issue SPR-10456 has been resolved. Consequently, the @Scheduled annotation has a new zone attribute for exactly this purpose.

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