java - 将 JSON 映射到 java POJO (jackson)

Question

我使用JAVA jackson将JSON映射到JAVA pojo对象，我的JSON文件是:

[
  [
    {
      "name": "tetragrammatonList_stocks_headerColumn_amountStoreOther",
      "id": "amountStoreOther"
    },
    {
      "name": "tetragrammatonList_stocks_headerColumn_article.articleSubGroup.name",
      "id": "article.articleSubGroup.name"
    },
    .....
    {
      "name": "tetragrammatonList_stocks_headerColumn_article.producer.name",
      "id": "article.producer.name"
    }
  ],
  [
    {
      "name": "tetragrammatonList_stocks_headerColumn_articleEANs",
      "id": "articleEANs"
    },
    {
      "name": "tetragrammatonList_stocks_headerColumn_article.plu",
      "id": "article.plu"
    },
    {
      "name": "tetragrammatonList_stocks_headerColumn_article.name",
      "id": "article.name"
    },
    .....
    {
      "name": "tetragrammatonList_stocks_headerColumn_article.producer.name",
      "id": "article.producer.name"
    }
  ]
]

在 readValue 之后我收到此错误消息:

无法从 START_ARRAY token 中反序列化 .... 的实例

我的 POJO 类:

public class A
    {
        private String name;
        private String id;
        +get/set methods
    }

    public class B
    {
        private String name;
        private String id;
        +get/set methods
    }

    public class Root
    {
        private List<A> a;
        private List<B> b;
        +get/set methods
    }

Root root = new ObjectMapper().configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false).readValue(jsonString, Root.class);

请问，这种 JSON 格式的正确 java pojo 是什么？谢谢。

Answer 1

@Getter
@Setter
public class Root
    {
        private List<A> a;
    }
@Getter
@Setter
private class A
    {
        private String name;
        private String id;
    }
ObjectMapper mapper = new ObjectMapper();
List <Root> rt = mapper.readValue(json, List.class);

试试这个