Java Read Textfile to get values in certain format

Question

I need to read a textfile with the below data:

{“car”:{“name”:”Toyota”,”vin”:637834623,”location”:”SomePlace”}}

I need to get the name, vin and location

how do I go about doing this? I was thinking i could try read it using JSON, will it work?

Thanks

Answer 1

Here's a working example using GSON (google's json library):

Please note that you will have to use "" quotes instead of “”, because the latter is not valid in JSON. You may use the .replaceAll(...) on the input string to replace these characters if you desire.

public class ReadCarFile {

    public static final Gson gson = new GsonBuilder().registerTypeAdapter(Car.class, new CarTypeAdapter()).create();

    public static void main(String[] args) {
        String input = "{\"car\":{\"name\":\"Toyota\",\"vin\":637834623,\"location\":”SomePlace\"}}";

        Car result = gson.fromJson(input, Car.class);
    }

    static class CarTypeAdapter implements JsonDeserializer<Car> {

        @Override
        public Car deserialize(JsonElement jsonElement, Type type, JsonDeserializationContext jsonDeserializationContext) throws JsonParseException {
            JsonObject carObject = jsonElement.getAsJsonObject().get("car").getAsJsonObject();

            Car car = new Car();
            car.name = carObject.get("name").getAsString();
            car.vin = carObject.get("vin").getAsInt();
            car.location = carObject.get("location").getAsString();
            return car;
        }
    }

    static class Car {

        @SerializedName("name")
        public String name;

        @SerializedName("vin")
        public int vin;

        @SerializedName("location")
        public String location;

    }
}