YAML文件解析

      YAML是“另一种标记语言”的外语缩写,YAML 是一种比JSON（json多层次{ 与 [ 会被搞晕的）更直观的表现形式，展示上更易查错和关系描述。因为不需要一个专业工具就可以排查正确性。YAML目前有多种语言提供了支持。

　　JAVA最终是要被序列化或反序列化，Jackson 提供了YAMLFactory.，可以方便解析YAML，并且可以无缝结合ObjectMapper.对原有系统改动最小。

Maven 引用以下包

 <dependency>
   <groupId>com.fasterxml.jackson.dataformat</groupId>
   <artifactId>jackson-dataformat-yaml</artifactId>
   <version>2.3.3</version>
</dependency>
 <dependency>
   <groupId>com.fasterxml.jackson.core</groupId>
  <artifactId>jackson-databind</artifactId>
  <version>2.3.3</version>
 </dependency>

public class YmalFc<T> {

    private final YAMLFactory yamlFactory;
    private final ObjectMapper mapper;
    private final Class<T> klass;

    public YmalFc(Class<T> klass) {
        this.klass = klass;
        this.yamlFactory = new YAMLFactory();
        this.mapper = new ObjectMapper();
        mapper.enable(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES);

    }

    public T build(String path) throws IOException {
        try {
            InputStream input =new FileInputStream(path);
            YAMLParser yamlParser = yamlFactory.createParser(input);
            final JsonNode node = mapper.readTree(yamlParser);
            TreeTraversingParser treeTraversingParser = new TreeTraversingParser(node);
            final T config = mapper.readValue(treeTraversingParser, klass);
            return config;
        } catch (Exception e) {
            throw e;
        }
    }

    public static void main(String[] args) {
        Contact contact = new Contact();
        YmalFc<Contact> ymalFc = new YmalFc<Contact>(Contact.class);
        try {
            contact = ymalFc.build(new FileConfigurationSourceProvider(), "contact.yml");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

public class Contact {
    @JsonProperty
    public String name;
    @JsonProperty
    public int age;

    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public int getAge() {
        return age;
    }
    public void setAge(int age) {
        this.age = age;
    }
}

YML文件

contact:
  name: Nathan Sweet
  age: 28

YML文件像Python 一样是一个需要注意空格缩进的语言。