具有动态位置路径的 Spring PropertyPlaceholderConfigurer

Question

我有以下基于 Spring XML 的配置:

<!--
  These properties define the db.type property.
-->
<bean class="org.springframework.context.support.PropertySourcesPlaceholderConfigurer">
  <property name="order" value="1"/>
  <property name="ignoreUnresolvablePlaceholders" value="true" />
  <property name="ignoreResourceNotFound" value="true" />
  <property name="locations">
    <list>
      <!-- contains default db.type -->
      <value>classpath:/default-cfg.properties</value>
      <!-- db.type can be overridden by optional properties in the app work dir -->
      <value>file:${app.work.dir}/cfg.properties</value>
    </list>
  </property>
</bean>

<!-- db.type should be used to get DB specific config properties -->
<bean class="org.springframework.context.support.PropertySourcesPlaceholderConfigurer">
  <property name="order" value="2"/>
  <property name="ignoreUnresolvablePlaceholders" value="false" />
  <property name="ignoreResourceNotFound" value="false" />
  <property name="locations">
    <list>
      <!-- does not work, ${db.type} does not get resolved -->
      <value>classpath:/default-cfg-${db.type}.properties</value>
    </list>
  </property>
</bean>

问题是 classpath:/default-cfg-${db.type}.properties 位置中的属性未得到解析，即使 db.type由第一个属性占位符配置器定义。

我不断在日志中收到以下错误:

 class path resource [default-cfg-${db.type}.properties] cannot be opened because it does not exist

有什么方法可以使用PropertyPlaceholderConfigurer的locations属性中的属性吗？我想避免使用 JVM 系统属性来设置 db.type 值。

谢谢你，一月

Answer 1

由于 Alireza Fattahi 要求我提供代码，并且 WornOutSoles 建议接受的解决方案不起作用，因此我将发布基于 Spring ApplicationContextInitializer 的最终解决方案:

public class SpringProfilesActivator
    implements ApplicationContextInitializer<XmlWebApplicationContext>
{
  private static final Logger log = LoggerFactory.getLogger( SpringProfilesActivator.class );

  ...

  @Override
  public void initialize( XmlWebApplicationContext applicationContext )
  {
    // TODO: get your profiles from somewhere (config files, JVM system properties, database etc.)
    String[] activeProfiles = new String[] { ... };

    log.info( "Activating Spring profiles: {}", Arrays.toString( activeProfiles ) );

    ConfigurableEnvironment env = applicationContext.getEnvironment();
    env.setActiveProfiles( activeProfiles );
  }

  ...
}