首先，您的Test类应使用@Component进行注释，以便在春季之前将其注册为bean(还请确保所有类位于您的主程序包下-主程序包位于带有@SpringBootApplication注释的类).

First of all your Test class should be annotated with @Component in order for it to be registered as a bean by spring (also make sure all your classes are under your main package - the main package is where a class that is annotated with @SpringBootApplication reside).

现在，您应该将所有属性移至application.yml(src/main/resources/application.yml)，该属性将由Spring Boot自动选择(请注意，该属性应为.yml而不是.yaml)或注册自定义的PropertySourcesPlaceholderConfigurer.

Now you should either move all your properties to application.yml (src/main/resources/application.yml), that is picked automatically by spring boot (note that it should be .yml instead of .yaml or register a custom PropertySourcesPlaceholderConfigurer.

PropertySourcesPlaceholderConfigurer的示例:

@Bean
public static PropertySourcesPlaceholderConfigurer PropertySourcesPlaceholderConfigurer() throws IOException {
    PropertySourcesPlaceholderConfigurer configurer = new PropertySourcesPlaceholderConfigurer();
    MutablePropertySources propertySources = new MutablePropertySources();
    Resource resource = new DefaultResourceLoader().getResource("classpath:application.yml");
    YamlPropertySourceLoader sourceLoader = new YamlPropertySourceLoader();
    PropertySource<?> yamlProperties = sourceLoader.load("yamlProperties", resource, null);
    propertySources.addFirst(yamlProperties);
    configurer.setPropertySources(propertySources);
    return configurer;
}

现在应该将属性加载到Spring的环境中，并且可以将它们与@Value一起注入到您的bean中.

Now your properties should be loaded to spring's environment and they will be available for injection with @Value to your beans.