泛型Gson反序列化器

Question

我有一个Api，Api如下所示:
如果响应是ok，那么结构将以data关键字开头，例如：

{
"data": {
"name": "Rogelio Volkman",
"address": "27299 Will Bridge Suite 058\nWest Reubenhaven, MI 00736",
"lat": 54.65,
"lng": 111.75,
"phone": "[phone]"
  }
}

{
"message": "404 Not Found",
"status_code": 404
}

public class DataObjectDeserializer implements JsonDeserializer<Object> {

@Override
public Objectdeserialize(JsonElement je, Type type, JsonDeserializationContext jdc)
        throws JsonParseException {
    // Get the "data" element from the parsed JSON
    JsonElement data = je.getAsJsonObject().get("data");

    // Deserialize it. You use a new instance of Gson to avoid infinite recursion
    // to this deserializer
    return new Gson().fromJson(data, Object.class);
  }
}

@Override
public DataObjectModel deserialize(JsonElement je, Type type, JsonDeserializationContext jdc)
        throws JsonParseException {
    // Get the "data" element from the parsed JSON
    JsonElement data = je.getAsJsonObject().get("data");

    // Deserialize it. You use a new instance of Gson to avoid infinite recursion
    // to this deserializer
    return new Gson().fromJson(data, DataObjectModel.class);
 }
} 

问题是：我如何为父类创建一个反序列化器，它也会反序列化子类（作为我的第二种方法），或者我如何用Gson创建一个泛型类，这样包装在data周围的每个tyoe都可以与它一起使用，比如:
public class DataObjectDeserializer implements JsonDeserializer{

@Override
public T deserialize(JsonElement je, Type type, JsonDeserializationContext jdc)
        throws JsonParseException {
    // Get the "data" element from the parsed JSON
    JsonElement data = je.getAsJsonObject().get("data");

    // Deserialize it. You use a new instance of Gson to avoid infinite recursion
    // to this deserializer
    return new Gson().fromJson(data, /* This part not working due to type erasing in java*/ T.calss);
 }
}

Answer 1

如果您像这样创建响应和数据结构

private class Data {

    @SerializedName("name")
    private String name;
    @SerializedName("address")
    private String address;
    @SerializedName("lat")
    private String lat;
    @SerializedName("lng")
    private String lng;
    @SerializedName("phone")
    private String phone;

}

private class Response {

    @SerializedName("message")
    private String message;
    @SerializedName("status_code")
    private int statusCode;
    @SerializedName("data")
    private Data data;

}

然后你可以做

Response response = new Gson().fromJson(json, Response.class);

if(response.statusCode == 0) {
    //everything ok, do something with response.data
} else {
    //display response.message, data will be null 
}