Custom mapping with GSon

Question

Is there any way to mapping nested json object into single Java class? for example, I have this json string:

{
  "order_id": 104,
  "order_details" : [
    {
      "name": "Product#1",
      "price": {
        "usd": 12.95
      }
    }
  ]
}

I want to map with this class:

public class Order{
   Int id; // rename
   String name; //map with order_details.name
   float price; //map with order_details.price.usd
}

*UPDATE: Sorry for unclear question. I am developer for both Objective-C and Java. When I work with JSONModel in ObjC, It's easy to config the mapping like this: https://github.com/icanzilb/JSONModel#key-mapping

I hate to parse JSON manually using getJSONObject(), getString(), ... I am finding a way to configure for automatically parsing with Gson for Java.

Possible duplicate of [JSON parsing using Gson for java](http://stackoverflow.com/questions/5490789/json-parsing-using-gson-for-java) — ThomasThiebaud, Oct 30 '15 at 10:21
What did you try ? There are lot of examples on SO or google... — ThomasThiebaud, Oct 30 '15 at 10:22

score 0 · Answer 1 · answered Oct 30 '15 at 10:26

0

Ofcourse. You can do it by using GSON library. You need to crate 2 pojo and the one which is at outside can have custom model.

answered Oct 30 '15 at 10:26

Emre Aktürk

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score 0 · Answer 2 · answered Oct 30 '15 at 12:21

You can try modify your model like this:

public class Order {

    int id; // rename
    String name; //map with order_details.name
    float price; //map with order_details.price.usd

    public void parce(String json) {
        try {
            JSONObject jsonObject = new JSONObject(json);
            id = jsonObject.getInt("order_id");
            name = jsonObject.getJSONArray("order_details").getJSONObject(0).getString("name");
            price = (float) jsonObject.getJSONArray("order_details").getJSONObject(0).getJSONObject("price").getDouble("usd");
        } catch (JSONException e) {
            e.printStackTrace();
        }
    }
}

Example to using this code:

Order order = new Order();
order.parce("{\"order_id\":104,\"order_details\":[{\"name\":\"Product#1\",\"price\":{\"usd\":12.95}}]}");

Result:

your solution seems doesn't use Gson for Java? – Nguyen Minh Binh Nov 01 '15 at 04:25 — Nguyen Minh Binh, Nov 01 '15 at 04:25

Custom mapping with GSon

2 Answers2