CODEWITHSUNDEEP
javajsonserializationgson
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Reputation: 2271

is it possible to Change the json name of fields of a class by annotating the object of the class instead of annotating the fields

Gson gson = gsonBuilder.create();
String json = gson.toJson(obj);

This object contains a pair . When it is converted to json it's value is displayed as :

_first : 1.0 , _second : 2.0

i want to change the name of the variable first and second to some string.

Can I change the name of the fields using annotation on the object for example

    class one {

    @SerializedName("number")
    int num ;

    @Some annotation to change the name of field one and field two
    Pair<Double,Double> var;

    Pair<String,Integer> var2;
    }

    class Pair<T1,T2>{

    T1 field_1;
    T2 field_2;
}

Upvotes: 1

Views: 253

Answers (1)

HMT
HMT

Reputation: 2271

I used a custom Serializer for solving this problem:

gsonBuilder.registerTypeAdapter(Pair.class, new PairCustomSerializer());

public class PairCustomSerializer implements JsonSerializer<Pair<?, ?>> {

        @Override
        public JsonElement serialize(Pair<?, ?> src, Type typeOfSrc, JsonSerializationContext context) {
            JsonObject obj = new JsonObject();
            JsonArray arr = new JsonArray();
            if (src.getFirst() instanceof Double) {
                Double val1 = (Double) src.getFirst();
                Double val2 = (Double) src.getSecond();
                arr.add(val1);
                arr.add(val2);
                obj.add("value", arr);
                return obj;
}

Upvotes: 1

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