多个Spring PropertyPlaceholderConfigurer同时出现 [英] Multiple Spring PropertyPlaceholderConfigurer at the same time

问题描述

我有两个项目，其中一个（服务）包括第二个项目（核心）。我在Core项目中定义了下面的PropertyPlaceholderConfigurer：

I have two projects, one of them (Services) includes the second one (Core). I've defined this PropertyPlaceholderConfigurer below within Core project:

<bean id="propertyConfigurer" class="org.springframework.context.support.PropertySourcesPlaceholderConfigurer">
    <property name="locations">
         <list>
             <value>classpath:appConfig.properties</value>
         </list>
    </property>
</bean>

我想在上层项目中扩展Core占位符，包括appConfig.properties和其他一些。我找到的唯一方法是在上层定义另一个不同的bean（不同的ID）并包含新的：

And I want to extend the Core placeholder in the upper project, including appConfig.properties and some other ones. The only way I found is to define another different bean (different ID) in the upper level and include the new ones:

<bean id="servicesPropertyConfigurer" class="org.springframework.context.support.PropertySourcesPlaceholderConfigurer">
    <property name="locations">
          <list>
                <value>classpath:swagger.properties</value>
          </list>
    </property>
</bean>

但它产生无法找到appConfig.properties，我想它只使用其中一个PropertyPlaceholderConfigurer同时？是否需要在上面的propertyConfigurer中指定所有资源？：

But it yields it cannot find appConfig.properties, I guess it's only using one of these PropertyPlaceholderConfigurer at the same time? Is it necesary to specify all resources in the upper propertyConfigurer?:

<bean id="servicesPropertyConfigurer" class="org.springframework.context.support.PropertySourcesPlaceholderConfigurer">
    <property name="locations">
          <list>
                <value>classpath:swagger.properties</value>
                <value>classpath:appConfig.properties</value>
          </list>
    </property>
</bean>

扩展Core bean是否可以同时使用两者？

Is it posible to extend the Core bean o use both at the same time?

推荐答案

你可以同时使用多个但是你必须为其他每个人都有不同的名字/ ids另一个。接下来，您需要为每个占位符使用不同的占位符（$ {...}），或者将其配置为忽略未解析的占位符。

You can use multiple at the same time BUT you have to have different names/ids for each else one will override the other. Next to that you need to either use different placeholders (${...}) for each or configure it to ignore unresolved placeholders.

我强烈建议您使用命名空间（< context：property-placeholder .. /> 为你节省了一些xml。（它将生成具有唯一名称的bean，因此你可以同时拥有多个，确保设置 ignore-unresolvable 属性到 true 。

Instead of using the class definition I strongly suggest yo use the namespace (<context:property-placeholder .. /> which saves you some xml. (It will generate beans with unique names so you can have multiple at the same time, make sure to set the ignore-unresolvable attribute to true.

作为最后的手段，你可以实现你的 BeanDefinitionRegistryPostProcessor 检测所有 PropertyPlaceHolderConfigurer 实例，将它们合并为一个并将所有位置/资源移动到合并的实例。这样您就不必担心多个不同的占位符或不可解析的属性。

As a last resort you could implement your a BeanDefinitionRegistryPostProcessor which detects all PropertyPlaceHolderConfigurer instances, merges them into one and move all the locations/resources to the merged one. That way you don't have to worry about multiple different placeholders or unresolvable properties.

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