带有接口的json反序列化

基于gson的解决方案：

//实现的一个InterfaceAdapter
public final class InterfaceAdapter implements JsonSerializer, JsonDeserializer {
    public JsonElement serialize(T object, Type interfaceType, JsonSerializationContext context) {
        final JsonObject wrapper = new JsonObject();
        wrapper.addProperty("type", object.getClass().getName());
        wrapper.add("data", context.serialize(object));
        return wrapper;
    }

    public T deserialize(JsonElement elem, Type interfaceType, JsonDeserializationContext context) throws JsonParseException {
        final JsonObject wrapper = (JsonObject) elem;
        final JsonElement typeName = get(wrapper, "type");
        final JsonElement data = get(wrapper, "data");
        final Type actualType = typeForName(typeName);
        return context.deserialize(data, actualType);

    }


    private Type typeForName(final JsonElement typeElem) {
        try {
            return Class.forName(typeElem.getAsString());
        } catch (ClassNotFoundException e) {
            throw new JsonParseException(e);
        }
    }

    private JsonElement get(final JsonObject wrapper, String memberName) {
        final JsonElement elem = wrapper.get(memberName);
        if (elem == null) throw new JsonParseException("no '" + memberName + "' member found in what was expected to be an interface wrapper");
        return elem;
    }
}

//实现
public static void main(String[] args){
    YourInterface interface= new YourInterfaceImplementation();
//新建gson对象，并注册类型适配器，注册你对象中所有的接口对象后，反序列化时，会将会找到你接口对象对应的实现类。详见上文中的类
    Gson gson = new GsonBuilder().registerTypeAdapter(YourInterface.class, new InterfaceAdapter())
            .create();
    String json = gson.toJson(interface,YourInterface.class);
    System.out.println(json+ "This is your json string!");

    Gson gson1 = new GsonBuilder().registerTypeAdapter(YourInterface.class, new InterfaceAdapter())
            .create();
    YourInterface yourDeserializedInterface = gson1.fromJson(json,YourInterface.class);
    System.out.println("Deserialized: "+yourDeserializedInterface);
}