Converting json string to java object?

Question

I have been looking around for examples related to converting JSON strings to Java object but haven\'t found any good examples. The one I found was really basic once and not

Answer 1

EDIT: You need your java Data class to be an exact model of the JSON. So your

{"data":{"translations":[{"translatedText":"Bonjour tout le monde"}]}} 

becomes:

class DataWrapper {
    public Data data;

    public static DataWrapper fromJson(String s) {
        return new Gson().fromJson(s, DataWrapper.class);
    }
    public String toString() {
        return new Gson().toJson(this);
    }
}
class Data {
    public List<Translation> translations;
}
class Translation { 
    public String translatedText;
}

As the object model gets more complicated the org.json style code veers towards unreadable whereas the gson/jackson style object mapping is still just plain java objects.

Answer 2

check this out Converting JSON to Java , i guess you can define a class as the object and pass that along. So, create some class and pass it along.

Data obj = gson.fromJson(json, Data.class);

class Data{
  public List<Data> getTranslation(){
     return translations;
  }
}

Try out something like that. You may need to experiment a little.

Answer 3

I usually like to use the plain org.json library

Use it as:

 // make sure the quotes are escaped
String str = "{\"data\":{\"translations\":[{\"translatedText\":\"Bonjour tout le monde\"}]}}";
 // the object data is inside a "global" JSONObject
data = new JSONObject(str).getJSONObject("data");
// get a JSONArray from inside an object
JSONArray translations = data.getJSONArray("translations");
// get the first JSONObject from the array
JSONObject text = translations.getJSONObject(0);
// get the String contained in the object -> logs Bonjour tout le monde
Log.d("***>Text", text.getString("translatedText"));

---

Maybe so much code is less clear than what I would have liked. This is the function as I would do it:

public String getTranslation(String json){  
  JSONObject data = new JSONObject(json).getJSONObject("data");
  return data.getJSONArray("translations").getJSONObject(0).getString("translatedText");
}