映射yaml数组到java对象

Question

如何将YAML数据映射到Java Pojo

 - messageId: A
   category: A
   severity: A

 - messageId: B
   category: B 
   severity: B

该数组将包含多个元素，

public class Message {
    private String messageID;
    private String category;
    private String severity;
}

public class MessageDefinitionList {
    private ArrayList<Message> msgDefinition;
}

后者遵循对象 - 录音器代码对我不起作用，并返回null

MessageDefinitionList msgDefinitionList = mapper.readValue(mapper.writeValueAsString(yaml.load(file)), MessageDefinitionList.class);

Answer 1

这将起作用：

msg.yml

msgDefinition:
- messageId: A
  category: A
  severity: A
- messageId: B
  category: B
  severity: B

）映射的字段名称与YAML中的字段名称相对应

@Data
class Message {
    private String messageId;
    private String category;
    private String severity;
}

@Data
class MessageDefinitionList {
    private List<Message> msgDefinition;
}

pojos（Lombok注释，请参阅杰克逊（Jackson （您可以使用String或> inputStream而不是文件 param）：

ObjectMapper mapper = new ObjectMapper(new YAMLFactory());
MessageDefinitionList result = mapper.readValue(new File("src/main/resources/msg.yml"), MessageDefinitionList.class);

Jackson Yaml Maven依赖关系：

<dependency>
    <groupId>com.fasterxml.jackson.dataformat</groupId>
    <artifactId>jackson-dataformat-yaml</artifactId>
    <version>2.13.0</version>
</dependency>