How to prevent Gson from converting a long number (a json string ) to scientific notation format?

Question

I need to convert json string to java object and display it as a long. The json string is a fixed array of long numbers:

{numbers
[ 268627104, 485677888, 506         


        

Answer 1

Another work around is to use the JsonParser class instead. This will return the Gson object representations (JsonElement) rather than a user defined class, but avoids the problem of conversion to scientific notation.

import java.lang.reflect.Type;
import java.util.Map;

import com.google.gson.Gson;
import com.google.gson.JsonElement;
import com.google.gson.JsonParser;
import com.google.gson.reflect.TypeToken;

public class GsonTest
{
    public static void main(String[] args)
    {
        String json = "{numbers:[268627104,485677888,506884800]}";

        Gson gson = new Gson();
        Type type = new TypeToken>(){}.getType();
        Map jsonMap = gson.fromJson(json, type);
        System.out.println("Gson output:");
        System.out.println(jsonMap);

        JsonParser jsonParser = new JsonParser();
        JsonElement jsonElement = jsonParser.parse(json);
        System.out.println("JsonParser output:");
        System.out.println(jsonElement);
    }
}

Code Output:

Gson output:  
{numbers=[2.68627104E8, 4.85677888E8, 5.068848E8]}  
JsonParser output:  
{"numbers":[268627104,485677888,506884800]}