How to retrieve the particular object field in Java?-CodePudding

I have rest call something like this when I am getting result I am getting in string format something like this ,

   public String getData(String value) throws ParseException {
                final String url = "https://v1/supplier/suggest/{value}";
                Map<String, String> params = new HashMap<String, String>();
                params.put("value", value);
                HttpEntity<?> httpEntity = new HttpEntity<>(this.getAuthHeaders());
                RestTemplate restTemplate = new RestTemplate();
                ResponseEntity<String> tpBody = restTemplate.exchange(url, HttpMethod.GET, httpEntity, String.class, params);
    JSONParser parser = new JSONParser();
        JSONObject json = (JSONObject) parser.parse(tpBody.getBody());
        JSONArray jsonArray = (JSONArray) json.get("data");
        if (jsonArray.isEmpty()) {
            System.out.println("No Data in JsonArray");
        } else {
            Object object = jsonArray.get(0);
            System.out.println(object.toString());
        }
    }
        
            }

Response:-

{"value":"DRAGON","datas":9.5}

Now from this string I want only datas field value , like suppose only 9.5

Any sort of help is appreciated .

CodePudding user response：

    import org.json.JSONArray;
    import org.json.JSONException;
    import org.json.JSONObject;
    
    JSONObject obj = new JSONObject(json);
    JSONArray arr = obj.getJSONArray("data");
    for (int i = 0; i < arr.length(); i  ) {
        String datas = arr.getJSONObject(i).getString("datas");
        System.out.println(datas);
    }

CodePudding user response：

The JSON response that you are getting is nothing but a Map. So I would suggest using the Jackson library to convert the json to a Map and then get the value for your key 'datas' - something like below:

   ObjectMapper mapper = new ObjectMapper();
   Map<String, Object> map = mapper.readValue(object.toString(),Map.class);
   Double datasValue = (Double) map.get("datas");

Dependency for Jackson is:

    <dependency>
        <groupId>com.fasterxml.jackson.core</groupId>
        <artifactId>jackson-databind</artifactId>
        <version>2.9.8</version>
    </dependency>