SpringBoot加载自定义yml文件

自定义配置文件（跟SpringBoot的application.yml同一目录下）：

nlu-parse-rule:
  title: "NLU响应结果解析规则"
  desc: "解析NLU的识别文本(JSON)构建响应URL,注意当前yaml配置中key不用到下划线"
  rules:
    - busiDesc: "能耗业务1"
      busiCode: "nh1"
      firstMarch:
        - $.store.bicycle.color|red|=
        - $.appkey|7kfo5mdq5xnf6ofkfh76xda7lbccqgi7gzfhakyq|=
      secondMatch:
        - $.store.bicycle.color|NULL|<>
        - $.store.bicycle.color|NULL|<>
      returnValue:  # url中占位符的真实替换值
        - key1|$.store.bicycle.color
        - key2|$.store.bicycle.color
        - key3|$.store.bicycle.color

映射为对象，代码如下：

 @Component
 @PropertySource(value= {"classpath:rules.yml"})
 @ConfigurationProperties(prefix = "nlu-parse-rule")
 @Data
 public class NluRuleProperties {
     private String title;
     private String desc;
     private List<NluRuleConfig> rules;
 }

调试发现竟然不识别，

@PropertySource 不支持yml文件的对象转换，原因如下，看源码：他的默认构造工厂是PropertySourceFactory

 @Target({ElementType.TYPE})
 @Retention(RetentionPolicy.RUNTIME)
 @Documented
 @Repeatable(PropertySources.class)
 public @interface PropertySource {
     String name() default "";

     String[] value();

     boolean ignoreResourceNotFound() default false;

     String encoding() default "";

     Class<? extends PropertySourceFactory> factory() default PropertySourceFactory.class;
 }

而PropertySourceFactory默认就一个实现：实现properties配置文件的加载解析

public class DefaultPropertySourceFactory implements PropertySourceFactory {
    public DefaultPropertySourceFactory() {
    }

    public PropertySource<?> createPropertySource(@Nullable String name, EncodedResource resource) throws IOException {
        return name != null ? new ResourcePropertySource(name, resource) : new ResourcePropertySource(resource);
    }
}

因此，我们只要实现一个yml文件的工厂类即可，参考：https://mdeinum.github.io/2018-07-04-PropertySource-with-yaml-files/

代码实现：

 public class YamlPropertySourceFactory implements PropertySourceFactory {
     @Override
     public PropertySource<?> createPropertySource(String name, EncodedResource resource) throws IOException {
         Properties propertiesFromYaml = loadYamlIntoProperties(resource);
         String sourceName = name != null ? name : resource.getResource().getFilename();
         return new PropertiesPropertySource(sourceName, propertiesFromYaml);
     }

     private Properties loadYamlIntoProperties(EncodedResource resource) throws FileNotFoundException {
         try {
             YamlPropertiesFactoryBean factory = new YamlPropertiesFactoryBean();
             factory.setResources(resource.getResource());
             factory.afterPropertiesSet();
             return factory.getObject();
         } catch (IllegalStateException e) {
             // for ignoreResourceNotFound
             Throwable cause = e.getCause();
             if (cause instanceof FileNotFoundException)
                 throw (FileNotFoundException) e.getCause();
             throw e;
         }
     }
 }

搞定！测试通过。