对于含有泛型的Collection在使用Gson序列化时信息丢失的解决方案

这两天项目接近冒烟阶段，没时间作详细描述。将关键类列举如下：

序列化的Adapter：

/**
 * @author lanbo.xj
 * 
 */
public class CarTypeAdapter implements JsonSerializer<Car> {

	private static Gson gson = new Gson();

	@Override
	public JsonElement serialize(Car car, Type type,
			JsonSerializationContext context) {
		JsonObject jo = new JsonObject();
		jo.add(car.getClass().getName(), gson.toJsonTree(car, car.getClass()));
		return jo;
	}

}

 

反序列化的Adapter：

/**
 * @author lanbo.xj
 * 
 */
public class CarListTypeAdapter implements JsonDeserializer<List<Car>> {

	@Override
	public List<Car> deserialize(JsonElement je, Type type,
			JsonDeserializationContext context) throws JsonParseException {
		List<Car> cars = new ArrayList<Car>();
		JsonArray jsonArr = je.getAsJsonArray();
		for (Iterator<JsonElement> iter = jsonArr.iterator(); iter.hasNext();) {
			JsonObject jo = (JsonObject) iter.next();
			for (Entry<String, JsonElement> entry : jo.entrySet()) {
				String className = entry.getKey();
				try {
					@SuppressWarnings("rawtypes")
					Class clazz = null;
					clazz = Class.forName(className);
					System.out.println(clazz.getName());
					Car car = context.deserialize(entry.getValue(), clazz);
					cars.add(car);
				} catch (ClassNotFoundException e) {
					e.printStackTrace();
				}
			}
		}
		return cars;
	}
}

 测试类：

public class GsonTest {
	public static void main(String[] args) {
		JeepCar car1 = new JeepCar();
		car1.setPrice(1000);
		car1.setSpeed(200);
		MotorCar car2 = new MotorCar();
		car2.setPrice(2000);
		car2.setYear(1999);
		List<Car> cars = new ArrayList<Car>();
		cars.add(car1);
		cars.add(car2);
		GsonBuilder gb = new GsonBuilder().serializeNulls();
		Type baseType = new TypeToken<List<Car>>(){}.getType();
		gb.registerTypeAdapter(baseType, new CarListTypeAdapter());
		gb.registerTypeAdapter(JeepCar.class, new CarTypeAdapter());
		gb.registerTypeAdapter(MotorCar.class, new CarTypeAdapter());
		Gson gson = gb.create();
		
		String str = gson.toJson(cars);		
		System.out.println(str);

		List<Car> cars3 = gson.fromJson(str, baseType);
		System.out.println(((JeepCar)cars3.get(0)).getSpeed());
	}
}