How to configure Spring scheduled tasks annotation

2 years ago
Liam
1 minute

In Spring, we can configure scheduled tasks using the @Scheduled annotation. First, add the following configuration to the Spring configuration file.

<task:annotation-driven/>

Next, add the @Scheduled annotation to the method where the scheduled task needs to be executed, and set the scheduled time for the task to run. For example:

@Scheduled(cron = "0 0 0 * * ?") // 每天凌晨执行
public void myTask() {
    // 执行定时任务的逻辑
}

The above code represents running the myTask method once every day at midnight.

The @Scheduled annotation has other properties that can be configured, such as:

  1. fixedRate: executed at a fixed rate, meaning it is triggered at regular intervals, with the unit being milliseconds.
  2. fixedDelay: This means that the next execution will occur after a fixed delay following the completion of the previous execution, with the delay time measured in milliseconds.
  3. initialDelay: the initial delay in execution, meaning the task will start after a fixed amount of time has passed, in milliseconds.
  4. Cron: Configure the timing of scheduled tasks using a cron expression.

For example, running at a fixed frequency:

@Scheduled(fixedRate = 5000) // 每隔 5 秒执行一次
public void myTask() {
    // 执行定时任务的逻辑
}

Use fixed delay execution:

@Scheduled(fixedDelay = 5000) // 上一次执行完毕后延迟 5 秒执行下一次
public void myTask() {
    // 执行定时任务的逻辑
}

Use initial delay execution:

@Scheduled(initialDelay = 5000, fixedRate = 5000) // 延迟 5 秒后执行第一次，然后每隔 5 秒执行一次
public void myTask() {
    // 执行定时任务的逻辑
}
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