Retrofit GSON serialize Date from json string into java.util.date

Retrofit GSON serialize Date from json string into java.util.date

To deserialize a date from a JSON string into a java.util.Date object using Retrofit and GSON, you can create a custom GSON JsonDeserializer. Retrofit allows you to customize the GSON instance it uses for deserialization.

Here's a step-by-step guide on how to achieve this:

  • Define your Retrofit service interface, as you normally would.

  • Create a custom GSON JsonDeserializer for parsing dates. In this example, we'll assume that the date is represented as a string in ISO 8601 format (e.g., "2023-11-13T15:30:00Z"):

import com.google.gson.JsonDeserializer; import com.google.gson.JsonElement; import com.google.gson.JsonParseException; import com.google.gson.JsonDeserializationContext; import java.text.ParseException; import java.text.SimpleDateFormat; import java.util.Date; import java.util.Locale; public class DateDeserializer implements JsonDeserializer<Date> { private final SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'", Locale.US); @Override public Date deserialize(JsonElement json, java.lang.reflect.Type typeOfT, JsonDeserializationContext context) throws JsonParseException { String dateStr = json.getAsString(); try { return dateFormat.parse(dateStr); } catch (ParseException e) { throw new JsonParseException(e); } } }
  • Create a custom Retrofit instance that uses your GSON JsonDeserializer:
import retrofit2.Retrofit; import retrofit2.converter.gson.GsonConverterFactory; import com.google.gson.Gson; import com.google.gson.GsonBuilder; public class RetrofitClient { public static Retrofit getClient(String baseUrl) { Gson gson = new GsonBuilder() .registerTypeAdapter(Date.class, new DateDeserializer()) .create(); return new Retrofit.Builder() .baseUrl(baseUrl) .addConverterFactory(GsonConverterFactory.create(gson)) .build(); } }

In this example, we register the DateDeserializer with the GsonBuilder so that it knows how to deserialize dates from JSON strings.

  • Use the Retrofit service interface to make API calls:
import retrofit2.Call; import retrofit2.http.GET; public interface MyApiService { @GET("your-api-endpoint") Call<MyResponse> getMyData(); }
  • Finally, use the Retrofit service to make a network request:
import retrofit2.Call; import retrofit2.Response; public class Main { public static void main(String[] args) { String baseUrl = "https://api.example.com/"; Retrofit retrofit = RetrofitClient.getClient(baseUrl); MyApiService apiService = retrofit.create(MyApiService.class); Call<MyResponse> call = apiService.getMyData(); try { Response<MyResponse> response = call.execute(); if (response.isSuccessful()) { MyResponse myData = response.body(); // Do something with myData } else { // Handle the error } } catch (IOException e) { e.printStackTrace(); } } }

In this example, when Retrofit makes a network request and receives JSON data with a date field, the custom DateDeserializer will deserialize it into a java.util.Date object.

Ensure that you adjust the date format and parsing logic in the DateDeserializer class to match the actual date format used in your JSON responses.

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