评估Spring表达式Lang（SpEL）中的属性 [英] Evaluating properties inside Spring Expression Lang (SpEL)

问题描述

我们的服务有一个根据属性文件安排的流程，读取属性 refreshIntervalMillis 。它的值直接注入到具有此配置的Quartz触发器中：

Our service has a process that is scheduled according to a properties file, reading the property refreshIntervalMillis. Its value is injected directly in a Quartz trigger with this configuration:

<bean name="trigger"
    class="org.springframework.scheduling.quartz.SimpleTriggerFactoryBean "
    p:repeatInterval="${refreshIntervalMillis}"> 
...
</bean>

但是，安装此服务的管理员以小时/天为单位，所以为了使对于他们来说更容易，我们将其更改为：

However, the admins that install this service think in terms of hours/days, so in order to make thing easier for them, we changed this to:

1. 将 refreshIntervalMillis 重命名为 refreshIntervalMinutes


2. 更改为以下代码：

1. Renamed refreshIntervalMillis to refreshIntervalMinutes
2. Changed to code above to the following:

p:repeatInterval="#{ 1000 * 60 * T(java.lang.Integer).valueOf(@configurationProperties['garbageLevelWatcher.refreshIntervalMinutes'])}"

注意：属性对象被公开为一个名为configurationProperties的bean

Note: the properties object is exposed as a bean named "configurationProperties"

有更简单的语法来完成相同的操作吗？

Is there a simpler syntax to accomplish the same?

谢谢，

推荐答案

＃{T（java.util。 concurrent.TimeUnit）.MINUTES.toMillis（@configurationProperties ['garbageLevelWatcher.refreshIntervalMinutes']）}

编辑：

或...

<context:property-placeholder properties-ref="configurationProperties"
<util:constant id = "MINUTES" static-field="java.util.concurrent.TimeUnit.MINUTES" />

和

"#{@MINUTES.toMillis(${garbageLevelWatcher.refreshIntervalMinutes})}"

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