部署不同的环境与春天和春天

问题描述

我有两个属性文件：

environment.properties:
 - project.host.db3.database.name=oracle

application.properties:
 - database.name=${project.host.db3.database.name}

第一个表示环境变量，第二个表示春季项目中使用的属性，在此配置中，我尝试设置environment.properties，当然，它不起作用：

The first one represents the environment variables and the second one the properties to be used in a spring project, in this configuration i try to set the environment.properties but of course it doesn't work:

<bean id="systemPropertiesLoader"
class="org.springframework.beans.factory.config.MethodInvokingFactoryBean">
        <property name="targetObject" value="#{@systemProperties}" />
        <property name="targetMethod" value="putAll" />
        <property name="arguments">
    <util:properties location="classpath:environment.properties" />
</property>
</bean>

<bean id="propertyPlaceholderConfigurer"
class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer"
depends-on="systemPropertiesLoader">
<property name="locations">
    <list>
        <value>classpath:application.properties</value>
    </list>
</property>

<!-- bean using database.name -->

是否可行？如果没有，人们如何在项目中拥有不可知的属性（如数据库.name），只有一个文件（war，jar等）要部署？

Is it doable?, and if not, how do people have agnostic properties in their projects (like database.name), and only one file (war, jar, etc.) to be deployed?

推荐答案

只要你定义你的属性就可以这样定义bean xml：

Well, it seems it's doable for beans xml defined as long as you define your properties it like this:

<bean id="propertyPlaceholderConfigurer"
class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer"
depends-on="systemPropertiesLoader">

但是，如果您尝试从servlet访问属性：

But if you ever try to access the properties from a servlet:

this.getClass().getClassLoader().getResourceAsStream("application.properties");

你有机会得到这个：

bad port configuration: ${project.host.db3.database.port}
java.lang.NumberFormatException: For input string: "${project.host.db3.database.port}"

在回答yorkw时，现在我可以在几个环境中部署相同的战争并配置主机-Denvironment =开发，所以我可以部署一个属性文件进行开发，生产等，只需使用：

In answer to yorkw, now i can have the same war to be deployed in several environments and configure the host with -Denvironment=development, so i can deploy a properties file for development, production, etc. and simply use:

<bean id="systemPropertiesLoader"
class="org.springframework.beans.factory.config.MethodInvokingFactoryBean">
        <property name="targetObject" value="#{@systemProperties}" />
        <property name="targetMethod" value="putAll" />
        <property name="arguments">
    <util:properties location="classpath:**${environment}/**environment.properties" />
</property>
</bean>

否则，我应该在部署之前将application.properties替换为每个环境。我相信有更好的解决方案。

Otherwise i should have the application.properties substituted before deployment for every environment. I'm sure there are better solutions than this.

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