Spring以编程方式加载属性文件

Question

如果文件在类路径上，这就是我加载application.properties的方式。

@ComponentScan
@Configuration
@PropertySource("classpath:application.properties")
public class MyApplication {
    // Have some public methods
}

public class Application {

    public static void main(String[] args) {

        AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(MyApplication.class);
        MyApplication app = context.getBean(MyApplication.class);

        // execute methods in app

    }
}

我们正在尝试部署应用程序，其中属性文件存储在外部的Google Cloud bucket(GCS)上。我可以从GCS加载属性文件并将其保存在内存中。如何将属性传递给应用程序上下文并重写从类路径加载的属性？

Answer 1

如果你有它在记忆中，那么它应该不是一个问题。去掉@PropertySource（“classpath：application.properties”）注释，手动注册PropertySourcesPlaceHolderConfigureerbean。

@Bean
public PropertySourcesPlaceholderConfigurer propertySourcesPlaceholderConfigurer() {
    PropertySourcesPlaceholderConfigurer properties = new PropertySourcesPlaceholderConfigurer();
    properties.setLocation([any implementation of Resource interface - use most applicable out of available or implement it by yourself]);
    return properties;
}