PropertyPlaceholderConfigurer与Tomcat& ContextLoaderListener的

问题描述

我正在使用PropertyPlaceholderConfigurer和Tomcat& ContextLoaderListener的。

I am using PropertyPlaceholderConfigurer with Tomcat & ContextLoaderListener.

这是有效的（硬件编码属性文件的名称）：

This works (with the name of the properties file hardcoded):

<bean id="placeholderConfig" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
    <property name="location" value="classpath:properties/test.properties"/>
</bean>

但是（使用$ {env}替换属性文件的名称）：

But this (with the name of the properties file replaced with ${env}):

<bean id="placeholderConfig" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
    <property name="location" value="classpath:properties/${env}.properties"/>
</bean>

[Thread-2] 15:50:16 ERROR ContextLoader - 上下文初始化失败
org .springframework.beans.factory.BeanInitializationException：无法加载属性;嵌套异常是java.io.FileNotFoundException：类路径资源[properties / $ {env} .properties]无法打开，因为它不存在

[Thread-2] 15:50:16 ERROR ContextLoader - Context initialization failedorg.springframework.beans.factory.BeanInitializationException: Could not load properties; nested exception is java.io.FileNotFoundException: class path resource [properties/${env}.properties] cannot be opened because it does not exist

我知道文件是因为它在我硬编码时起作用。

I know the file is there since it works when I hardcode it.

我在启动Tomcat并设置环境变量时尝试使用-Denv = test。我使用自己的main方法而不是ContextLoaderListener在Tomcat之外工作。

I have tried using -Denv=test when starting Tomcat and setting an environment variable. I have the same thing working outside of Tomcat using my own main method instead of ContextLoaderListener.

我可能做错了什么？我可以使用context.xml或web.xml中的条目而不是-Denv = test来实现相同的功能吗？

What might I be doing wrong? Can I achieve the same thing using an entry in context.xml or web.xml instead of -Denv=test?

谢谢

PS我也试过：

<bean id="initialcorePropertyConfigurer" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
    <property name="systemPropertiesModeName">
        <value>SYSTEM_PROPERTIES_MODE_OVERRIDE</value>
    </property>
    <property name="searchSystemEnvironment">
        <value type="boolean">true</value>
    </property>
    <property name="ignoreUnresolvablePlaceholders" value="true" />
</bean>

<bean id="corePropertyConfigurer" depends-on="initialcorePropertyConfigurer" lazy-init="true"
  class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
    <property name="location" value="classpath:properties/${env}.properties" />
</bean>

但我得到同样的错误。

推荐答案

您不能在PropertyPlaceholderConfigurer定义中使用属性占位符。鸡肉和鸡蛋。

You can't use a property placeholder in your PropertyPlaceholderConfigurer definition. Chicken-and-the-egg.

但是你可以使用＃{systemProperties ['env']}

或者您可以继承 PropertyPlaceholderConfigurer 并覆盖 setLocation（）处理占位符。

Or you could subclass PropertyPlaceholderConfigurer and override setLocation() to handle a placeholder.

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