SpringBoot读取配置文件（从classpath/file读取yml/properties文件)

 
@Bean
public static PropertySourcesPlaceholderConfigurer properties() {
    PropertySourcesPlaceholderConfigurer configurer = new PropertySourcesPlaceholderConfigurer();
    YamlPropertiesFactoryBean yaml = new YamlPropertiesFactoryBean();
    yaml.setResources(new FileSystemResource("/dir/application.yml"));//File引入
    //yaml.setResources(new ClassPathResource("application.yml"));//class引入
    configurer.setProperties(yaml.getObject());
    return configurer;
}