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 作业?

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

背景:

我有一个每天执行一次的作业，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
}

问题是不同服务器的 2 PM 不同，因为 Spring 在 TimeZone.getDefault() 上使用 内部.此外，JavaDocTimeZone.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:

获取此主机的默认时区.默认 TimeZone 的来源可能因实现而异.

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

换句话说，时区是不确定的.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，除非有一种方法可以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

从 Spring 4 开始，Spring Jira 问题 SPR-10456 已得到解决.因此，@Scheduled 注释有一个新的 zone 属性正是为了这个目的.

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.

推荐答案

原来我无法使用 @Scheduled 注释，但我实现了一个变通方法.在的JavaDoc中SchedulingConfigurer 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时使用的特定 TaskScheduler bean，或用于以编程方式注册计划任务，而不是使用 @Scheduled 注释的声明性方法.

[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 接口，然后更新我的配置文件以实现 SchedulingConfigurer，如下所示:

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.

Please read the JavaDoc of the @EnableScheduling for more information.

更新

从 Spring 4 开始，Spring Jira 问题 SPR-10456 已得到解决.因此，@Scheduled 注释有一个新的 zone 属性正是为了这个目的，例如

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, e.g.

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

这篇关于为 Spring @Scheduled 提供时区?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！