如何从多个文件中收集用于单个 bean 的 spring 属性 [英] How to collect spring properties from multiple files for use on a single bean

问题描述

我还没有完全了解 Spring，所以如果这个问题没有意义，请纠正我......

I haven't gotten my head wrapped around Spring yet, so correct me if this question doesn't make sense...

我有一个 PropertyPlaceholderConfigurer

I have a PropertyPlaceholderConfigurer

<bean id="rdbmPropertiesPlacholder" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer" lazy-init="false">
    <property name="location" value="classpath:/properties/rdbm.properties" />
</bean>

我猜我注入了一个 bean?

And I have a bean being injected I guess?

<bean id="PortalDb" class="org.apache.commons.dbcp.BasicDataSource">
    <property name="driverClassName" value="${hibernate.connection.driver_class}" />
    <property name="url" value="${hibernate.connection.url}" />
    <property name="username" value="${hibernate.connection.username}" />
    <property name="password" value="${hibernate.connection.password}" />
    ...

我想要的是使用用户名/密码指向不同属性文件的第二个占位符，以便我可以将属性拆分为两个不同的文件.那么数据库连接信息就可以和db用户名/密码分开了，我可以源控制一个而不是另一个.

What I want is a second placeholder pointing to a different properties file with the username/password so that I can split up the properties into two different files. Then the database connection information can be separate from the db username/password, and I can source control one and not the other.

我基本上尝试使用不同的 id 和文件复制 rdbmPropertiesPlaceholder 并尝试访问属性，但它不起作用.

I've tried basically copying the rdbmPropertiesPlaceholder with a different id and file and trying to access the properties, but it doesn't work.

此代码来自 uPortal 开源门户网站项目.

This code is from the uPortal open source web portal project.

推荐答案

使用此表示法可以指定多个文件:

Using this notation lets you specify multiple files:

 <bean id="rdbmPropertiesPlacholder" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer" lazy-init="false">
     <property name="locations">
       <list>
           <value>classpath:/properties/rdbm.properties</value>
           <value>classpath:/properties/passwords.properties</value>
       </list>
    </property>
 </bean>

propertyplaceholderconfigurerer 只是将所有这些合并起来，看起来只有一个，因此您的 bean 定义不知道这些属性来自哪里.

The propertyplaceholderconfigurerer just merges all of these to look like there's only one, so your bean definitions do not know where the properties come from.

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