有没有办法用另一个属性源(特别是系统环境)覆盖通过 Spring Cloud Config Server 设置的属性?我知道我可以通过循环来手动完成Environment
对象的PropertySource
s,但如果我可以设置它以便bootstrapConfig
来源是最低优先级,这将是理想的。
FWIW,我通过编写自定义程序来完成此任务ApplicationListener
其事件在周期早期触发,但在配置服务之后触发PropertySource
已加载。我已在此处附上代码,以防有人感兴趣。如果有一个“官方”Spring 方法可以做到这一点,我仍然感兴趣,但这有效:
package com.example;
import org.springframework.boot.context.event.ApplicationPreparedEvent;
import org.springframework.context.ApplicationListener;
import org.springframework.core.Ordered;
import org.springframework.core.annotation.Order;
import org.springframework.core.env.CompositePropertySource;
import org.springframework.core.env.ConfigurableEnvironment;
import org.springframework.core.env.MutablePropertySources;
import org.springframework.core.env.PropertySource;
@Order(Ordered.HIGHEST_PRECEDENCE)
public class ConfigServicePropertyDeprioritizer
implements ApplicationListener<ApplicationPreparedEvent>
{
private static final String CONFIG_SOURCE = "bootstrap";
private static final String PRIORITY_SOURCE = "systemEnvironment";
@Override
public void onApplicationEvent(ApplicationPreparedEvent event)
{
ConfigurableEnvironment environment = event.getApplicationContext()
.getEnvironment();
MutablePropertySources sources = environment.getPropertySources();
PropertySource<?> bootstrap = findSourceToMove(sources);
if (bootstrap != null)
{
sources.addAfter(PRIORITY_SOURCE, bootstrap);
}
}
private PropertySource<?> findSourceToMove(MutablePropertySources sources)
{
boolean foundPrioritySource = false;
for (PropertySource<?> source : sources)
{
if (PRIORITY_SOURCE.equals(source.getName()))
{
foundPrioritySource = true;
continue;
}
if (CONFIG_SOURCE.equals(source.getName()))
{
// during bootstrapping, the "bootstrap" PropertySource
// is a simple MapPropertySource, which we don't want to
// use, as it's eventually removed. The real values will
// be in a CompositePropertySource
if (source instanceof CompositePropertySource)
{
return foundPrioritySource ? null : source;
}
}
}
return null;
}
}
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