在序列化泛型类时动态更改属性

Question

我有以下通用类，我正在尝试使用 Gson 库进行序列化。

public class TRequest<T> implements RealmModel {


    private RealmList<T> requestList;

    public RealmList<T> getRequestList() {
        return requestList;
    }

    public void setRequestList(RealmList<T> requestList) {
        this.requestList = requestList;
    }
}

编写了以下代码来序列化数据

    //crate fitness object
    Fitness fitness = new Fitness();
    fitness.set_id("100");
    fitness.setIntensity("2300");

    //create realm list
    RealmList<Fitness> fitnessRealmList  = new RealmList<Fitness>();
    fitnessRealmList.add(fitness);

    //create tRequest object
    TRequest<Fitness> tRequest = new TRequest<Fitness>();
    tRequest.setRequestList(fitnessRealmList);


    GsonBuilder builder = new GsonBuilder();
    Gson gson = builder.create();


    //serialize it 
    String stringData = gson.toJson(tRequest);

结果我得到以下输出

{"requestList":[{"_id":"100","intensity":"2300"}]}

由于我的课程是通用的，我想将属性值动态从“requestList”更改为“fitness”。同样，如果我正在序列化例程对象，那么它应该将“requestList”替换为“例程”。

预期输出是

{"fitness":[{"_id":"100","intensity":"2300"}]}

我尝试了以下类型的令牌，但它不起作用

    Type type  = new  TypeToken<Fitness>(){}.getType();
    String stringData = gson.toJson(tRequest,type);

Answer 1

我会尝试这里解释的自定义序列化程序：link

这是一个例子：

public class TRequest<T> {

    private final String attributeName;
    private RealmList<T> requestList;

    public TRequest(String attributeName) {
        this.attributeName = attributeName;
    }

    public String getAttributeName() {
        return attributeName;
    }

    public RealmList<T> getRequestList() {
        return requestList;
    }

    public void setRequestList(RealmList<T> requestList) {
        this.requestList = requestList;
    }
}

public class MySerializer implements JsonSerializer<TRequest<?>> {

    @Override
    public JsonElement serialize(TRequest<?> t, Type type, JsonSerializationContext jsc) {
        JsonObject obj = new JsonObject();
        obj.add(t.getAttributeName(), jsc.serialize(t.getRequestList()));
        return obj;
    }

}

//when using it
GsonBuilder builder = new GsonBuilder();
builder.registerTypeAdapter(TRequest.class, new MySerializer());
Gson gson = builder.create();
String toJson = gson.toJson(tRequest);