<上下文:属性占位符>子级(Web)上下文无法访问的属性 [英] <context:property-placeholder> properties not accessible to the child (web) context

问题描述

一个典型的用例:我有applicationContext.xml和dispatcher-servlet.xml.在父级上下文(applicationContext.xml)中，我有:

A typical use-case: I'm having applicationContext.xml and dispatcher-servlet.xml. In the parent context (applicationContext.xml) I have:

 <context:property-placeholder location="classpath:application.properties" />

但是，Web上下文无法访问由它加载的属性-既不能在xml中使用，也不能使用@Value来访问. (它们只是无法解析，而是将表达式(${varName})设置为值)

However, the properties loaded by it are not accessible to the web context - neither in xml, nor using @Value. (They are just not resolved and the expression (${varName}) is set as value instead)

我也通过将<context:property-placeholder>添加到dispatcher-servlet.xml来解决此问题，但我想知道是否:

I worked it around by adding the <context:property-placeholder> to dispatcher-servlet.xml as well, but I wondered whether:

1. 这是预期的行为
2. 没有更好的方法可以将属性公开给子上下文.

推荐答案

是的，这是预期的行为. <context:property-placeholder>创建一个BeanFactoryPostProcessor，该BeanFactoryPostProcessor在每个上下文中应用.因此，无论如何，您将需要在子上下文中使用后处理器.

Yes, this is an expected behaviour. <context:property-placeholder> creates a BeanFactoryPostProcessor which is applied at per-context basis. So, you'll need a postprocessor in the child context anyway.

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