Created
May 15, 2017 11:48
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| public interface IAnimal { public String sound(); } | |
| public class Cat implements IAnimal { | |
| public String name; | |
| public Cat(String name) { | |
| super(); | |
| this.name = name; | |
| } | |
| @Override | |
| public String sound() { | |
| return name + " : \"meaow\""; | |
| }; | |
| } | |
| public class Dog implements IAnimal { | |
| public String name; | |
| public int ferocity; | |
| public Dog(String name, int ferocity) { | |
| super(); | |
| this.name = name; | |
| this.ferocity = ferocity; | |
| } | |
| @Override | |
| public String sound() { | |
| return name + " : \"bark\" (ferocity level:" + ferocity + ")"; | |
| } | |
| } | |
| public class IAnimalAdapter implements JsonSerializer<IAnimal>, JsonDeserializer<IAnimal>{ | |
| private static final String CLASSNAME = "CLASSNAME"; | |
| private static final String INSTANCE = "INSTANCE"; | |
| @Override | |
| public JsonElement serialize(IAnimal src, Type typeOfSrc, | |
| JsonSerializationContext context) { | |
| JsonObject retValue = new JsonObject(); | |
| String className = src.getClass().getName(); | |
| retValue.addProperty(CLASSNAME, className); | |
| JsonElement elem = context.serialize(src); | |
| retValue.add(INSTANCE, elem); | |
| return retValue; | |
| } | |
| @Override | |
| public IAnimal deserialize(JsonElement json, Type typeOfT, | |
| JsonDeserializationContext context) throws JsonParseException { | |
| JsonObject jsonObject = json.getAsJsonObject(); | |
| JsonPrimitive prim = (JsonPrimitive) jsonObject.get(CLASSNAME); | |
| String className = prim.getAsString(); | |
| Class<?> klass = null; | |
| try { | |
| klass = Class.forName(className); | |
| } catch (ClassNotFoundException e) { | |
| e.printStackTrace(); | |
| throw new JsonParseException(e.getMessage()); | |
| } | |
| return context.deserialize(jsonObject.get(INSTANCE), klass); | |
| } | |
| } | |
| public class Test { | |
| public static void main(String[] args) { | |
| IAnimal animals[] = new IAnimal[]{new Cat("Kitty"), new Dog("Brutus", 5)}; | |
| Gson gsonExt = null; | |
| { | |
| GsonBuilder builder = new GsonBuilder(); | |
| builder.registerTypeAdapter(IAnimal.class, new IAnimalAdapter()); | |
| gsonExt = builder.create(); | |
| } | |
| for (IAnimal animal : animals) { | |
| String animalJson = gsonExt.toJson(animal, IAnimal.class); | |
| System.out.println("serialized with the custom serializer:" + animalJson); | |
| IAnimal animal2 = gsonExt.fromJson(animalJson, IAnimal.class); | |
| System.out.println(animal2.sound()); | |
| } | |
| } | |
| } |
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