java - ObjectMapper 从具有特定名称的字段创建列表

Question

我有一个 JSON，我将其解析为结果对象列表。此对象包含 5 个字符串字段，称为 photo1、photo2 等。(基于 JSON)是否可以将它们直接读入列表字段？

JSON 喜欢:

{
    "ErrorMessage": null,
    "Result": [{
        "id": "462290",
        "name_English": "name in english",
        "name_Local": "külföldiül a név",
        "zipcode": "5463",
        "photo1": "dfglkj.com/blabla",
        "photo2": "dfglkj.com/blabla",
        "photo3": "dfglkj.com/blabla",
        "photo4": "dfglkj.com/blabla",
        "photo5": "dfglkj.com/blabla"
    }]
}

和我的对象:

static final class ApiResponse
    {
        public String ErrorMessage;
        public List<Result> Result = new ArrayList<Result>();
    }

 static final class Result
    {
        public String id;
        public String name_English;
        public String name_Local;
        public List<String> photos;
        public String zipcode;
    }

我有一个 ObjectMapper:

private static ObjectMapper newObjectMapper()
        {
            final ObjectMapper om =
                new ObjectMapper()  //
                .configure(DeserializationConfig.Feature.FAIL_ON_UNKNOWN_PROPERTIES, false)  //
                .configure(JsonParser.Feature.CANONICALIZE_FIELD_NAMES, true);

            om.registerSubtypes(ApiResponse.class);

            return om;
        }

在解析器中:

final ApiResponse ret = OM.readValue(inputStream, ApiResponse.class);

Answer 1

根据 Gaetano 的回答，我写了一个更通用的解决方案(任意数量的照片，任意数量的其他字段

@Override public List<Result> deserialize(JsonParser jp, DeserializationContext ctxt) throws IOException, JsonProcessingException
        {
            JsonNode node = jp.getCodec().readTree(jp);
            List<Result> listResult = new ArrayList<Result>();

            for (JsonNode interNode : node)
            {
                Result result = new Result();

                for (int i = 1; i < 30; i++)
                {
                    if (interNode.get("photo" + i) != null)
                    {
                        result.photos.add(interNode.get("photo" + i).getTextValue());
                    }
                    else
                    {
                        break;
                    }
                }

                for (Field field : result.getClass().getDeclaredFields())
                {
                    if (interNode.get(field.getName()) != null)
                    {
                        try
                        {
                            field.set(result, interNode.get(field.getName()).getTextValue());
                        }
                        catch (IllegalAccessException e)
                        {
                            e.printStackTrace();
                        }
                    }
                }

                listResult.add(result);
            }

            return listResult;
        }