How to parse JSON in Java and put values into Collection

Question

Is there a way in Java in which i can read from json and directly put it`s values in a Collection. In my case I have three different type. Can i make it :

Collection<Type> types;

JSON :

{
"type1":[
      {
        "version": "1.11",
        "releaseDate": "2015-03-26",
        "downloadUrl": "****"
      },
      {
        "version": "1.12",
        "releaseDate": "2015-04-08",
        "downloadUrl": "****"
      }],
"type2":[
      {
        "version": "2.20",
        "releaseDate": "2015-03-26",
        "downloadUrl": "****"
      },
      {
        "version": "2.21",
        "releaseDate": "2015-04-08",
        "downloadUrl": "****"
      }],
"type3":[
      {
        "version": "2.56",
        "releaseDate": "2015-03-26",
        "downloadUrl": "****"
      },
      {
        "version": "2.57",
        "releaseDate": "2015-04-08",
        "downloadUrl": "****"
      }]
}

There are many Java APIs for JSON. One of them is here: http://www.json.org/java/. — Balkrishna Rawool, Jun 15 '15 at 08:59
maybe this should be a class that represent the 3 types i have, a class which have String version, realeaseDate and downloadUrl, but I don`t know how to do this — alle3x, Jun 15 '15 at 08:59
@alle3x you need to define a class called Type. then its just a simple method that takes a json as parameter and return you an Object Type. — nafas, Jun 15 '15 at 09:00

Vicky Thakor · Answer 1 · 2015-06-15T09:18:05.357

0

You can do this easily using Gson. I'm giving you basic idea change your as per your requirements like datatype, conventions, etc...

public class YourType{
 private String version;
 private String releaseDate;
 private String downloadUrl;
 // getter-setter
}

And

/* Code to convert JSON to Collection */
import java.lang.reflect.Type;
import com.google.gson.reflect.TypeToken;

Type objType = new TypeToken<List<YourType>>(){}.getType();
List<YourType> list = objGson.fromJson(yourJSONObject.getJSONArray("type1").toString(), objType);

edited Jun 15 '15 at 09:18

answered Jun 15 '15 at 09:08

Vicky Thakor

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how should jsonObjectProduct variable look like ? – alle3x Jun 15 '15 at 09:17
you could try this: http://pojo.sodhanalibrary.com/. I copy pasted your code in to that page. It generated the code. You might want to take a look at it. – Francis Zabala Jun 15 '15 at 09:17
@alle3x Its mistake. It'll be your JSON Object – Vicky Thakor Jun 15 '15 at 09:18
Down voter can you tell me why? – Vicky Thakor Jun 15 '15 at 09:28

How to parse JSON in Java and put values into Collection

1 Answers1