SpringBoot引入额外的YAML配置文件的代码实现

# extra.yml
extra:
  name: 张三
  order: 3

@Data
@ConfigurationProperties("extra")
public class ExtraProperties {

    private String name;

    private Integer order;
}

@Configuration
@EnableConfigurationProperties(ExtraProperties.class)
@PropertySource(
        // 配置文件路径
        value = "classpath:/extra.yml",
        // 当配置文件不存在时，是忽略还是报错
        ignoreResourceNotFound = true,
        // 配置文件编码
        encoding = "UTF-8",
        // 配置文件加载工厂
        factory = YamlPropertySourceFactory.class)
public class ExtraConfig {
}

/**
 * YAML配置文件加载工厂
 */
public class YamlPropertySourceFactory implements PropertySourceFactory {

    @Override
    public PropertySource<?> createPropertySource(String name, EncodedResource resource) throws IOException {
        try {
            return new YamlPropertySourceLoader()
                    .load(resource.getResource().getFilename(), resource.getResource())
                    .get(0);
        } catch (IllegalStateException e) {
            // 如果YAML配置文件不存在，希望能忽略该文件，而不是引发异常导致Spring容器启动失败
            // 需要往外抛FileNotFoundException，Spring捕捉到后会忽略该异常（当 ignoreResourceNotFound = true 时）
            if (e.getCause() instanceof FileNotFoundException) {
                throw (FileNotFoundException) e.getCause();
            } else {
                throw e;
            }
        }
    }
}

# application.yml，会覆盖extra.yml中的相同配置项
extra:
  name: 李四
  order: 4

@Configuration
@EnableConfigurationProperties(ExtraProperties.class)
@PropertySource(
        value = {"classpath:/extra.yml", "classpath:/extra-${spring.profiles.active}.yml"},
        ignoreResourceNotFound = true,
        encoding = "UTF-8",
        // 配置文件加载工厂
        factory = YamlPropertySourceFactory.class)
public class ExtraConfig {
}

# extra-dev.yml，会覆盖extra.yml中的相同配置项
extra:
  name: 王五
  order: 5