[FIXED] How do I deserialize json into a single object from RestTemplate?

Issue

I have to use the exchange() method because I pass HttpHeaders there.

ResponseEntity<WeatherResponse> response Entity = restTemplate.exchange(
weather UrlRequest, Http Method.GET, new HttpEntity<>(headers), WeatherResponse.class);

JSON:

{
    "geoloc": {
         "city": {
             "id": 213,
             "name": "Boston"
         },
         "country": {
             "id": 213,
             "name": "USA"
         },
    "temp": {
         "value": 19.4
    }
}

Object to deserialization:

class WeahterResponse{
   String country;
   String city;
   float temp;
}

How to influence deserialization in this case. There are two objects in JSON, and I need one?

Solution

Thanks for João Dias. I made custom deserializer. https://www.baeldung.com/jackson-deserialization

In my case:

public class WeatherDeserializer extends JsonDeserializer<WeatherResponse> {

    @Override
    public WeatherResponse deserialize(JsonParser jsonParser, DeserializationContext deserializationContext) throws IOException {
        JsonNode nodeTree = jsonParser.getCodec().readTree(jsonParser);
        JsonNode geoObjectNode =  nodeTree.get("geo_object");
        JsonNode factNode = nodeTree.get("fact");
        String country =  geoObjectNode.get("country").get("name").textValue();
        String province =  geoObjectNode.get("province").get("name").textValue();
        String locality = geoObjectNode.get("locality").get("name").textValue();
        GeoObject geoObject = new GeoObject(country, province, locality);
        Short temp = factNode.get("temp").shortValue();
        Long obsTime = factNode.get("uptime").longValue();
        return new WeatherResponse(geoObject,temp,obsTime);
    }
}

@AllArgsConstructor
@Getter
@JsonDeserialize(using = WeatherDeserializer.class)
public class WeatherResponse {
    private GeoObject geoObject;
    private Short temp;
    private Long uptime;
}

Answered By - Самый Важный
Answer Checked By - Mary Flores (JavaFixing Volunteer)