Wert von JSON Response mit verschachtelten Namen Wertepaare basierend auf einem Namen Wert in Java

Question

Ich brauche den entsprechenden "Wert" basierend auf der "attr_id" aus "full_nutrients" -Array in der JSON-Antwort unten mit Java, wie kann das erreicht werden? Zum Beispiel möchte ich den Wert erhalten, wenn "attr_id" == 205.

JSON Antwort:

"foods": [ 
    { 
     "food_name": "chicken noodle soup", 
     "brand_name": null, 
     "serving_qty": 1, 
     "serving_unit": "cup", 
     "serving_weight_grams": 248, 
     "nf_calories": 62, 
     "nf_total_fat": 2.36, 
     "nf_saturated_fat": 0.65, 
     "nf_cholesterol": 12.4, 
     "nf_sodium": 865.52, 
     "nf_total_carbohydrate": 7.32, 
     "nf_dietary_fiber": 0.5, 
     "nf_sugars": 0.67, 
     "nf_protein": 3.15, 
     "nf_potassium": 54.56, 
     "nf_p": 42.16, 
     "full_nutrients": [ 
      { 
       "attr_id": 203, 
       "value": 3.1496 
      }, 
      { 
       "attr_id": 204, 
       "value": 2.356 
      }, 
      { 
       "attr_id": 205, 
       "value": 7.316 
      }, 
      { 
       "attr_id": 207, 
       "value": 2.5048 
      }], 
     } 

Answer 1

Ihr json ungültig ist.

Sie können dies ändern.

{"foods": [ 

{ 
    "food_name": "chicken noodle soup", 
    "brand_name": null, 
    "serving_qty": 1, 
    "serving_unit": "cup", 
    "serving_weight_grams": 248, 
    "nf_calories": 62, 
    "nf_total_fat": 2.36, 
    "nf_saturated_fat": 0.65, 
    "nf_cholesterol": 12.4, 
    "nf_sodium": 865.52, 
    "nf_total_carbohydrate": 7.32, 
    "nf_dietary_fiber": 0.5, 
    "nf_sugars": 0.67, 
    "nf_protein": 3.15, 
    "nf_potassium": 54.56, 
    "nf_p": 42.16, 
    "full_nutrients": [ 
     { 
      "attr_id": 203, 
      "value": 3.1496 
     }, 
     { 
      "attr_id": 204, 
      "value": 2.356 
     }, 
     { 
      "attr_id": 205, 
      "value": 7.316 
     }, 
     { 
      "attr_id": 207, 
      "value": 2.5048 
     }], 
    } 
} 

Versuchen Sie, diese

try { 
     // if your response is { },you can use JSONObject 
     JSONObject jsonObject = new JSONObject(response); 
     // then find the foods tag in your json data 
     JSONArray foods = jsonObject.getJSONArray("foods"); 
     // loop for the JSONArray 
     for (int i = 0; i < foods.length(); i++) { 
      // getJSONObject from the index 
      JSONObject jsonObject1 = foods.getJSONObject(i); 
      // then get full_nutrients tag 
      JSONArray full_nutrients = jsonObject1.getJSONArray("full_nutrients"); 
      // loop for the JSONArray 
      for (int j = 0; j < full_nutrients.length(); j++) { 
       // getJSONObject from the index again 
       JSONObject jsonObject2 = full_nutrients.getJSONObject(i); 
       // get attr_id 
       String attr_id = jsonObject2.getString("attr_id"); 
       // get value 
       String value = jsonObject2.getString("value"); 
      } 
     } 
} catch (JSONException e) { 
     e.printStackTrace(); 
} 

Answer 2

Try this:

function Double GetValue(String json_object, int attr_id) { 

    Double tResult = 0; 
    JSONObject reader = new JSONObject(json_object); 
    // Getting JSON Array node 
    JSONArray full_nutrients = reader.getJSONArray("full_nutrients"); 

    // looping through All full_nutrients 
    for (int i = 0; i < full_nutrients.length(); i++) { 
     JSONObject c = full_nutrients.getJSONObject(i); 
     if (c.getInt("attr_id") == attr_id) 
      tResult = c.getDouble("value"); 
    } 
    return tResult; 
}