如何用GSON反序列化不同对象数组

Question

我像这样接收JSON

[
  {
    "albums" : [
      {"id":"0", "name":"name"},
      {"id":"1", "name":"name"}
    ],
    "name":"name"
  },
  {
    "tracks" : [
      {"id":"0", "name":"name", "duration":"3:30"},
      {"id":"1", "name":"name", "duration":"2:40"}
    ],
    "name":"name"
  },
  {
    "playlists" : [
      {"id":"0", "name":"name", "tracksCount":"3"},
      {"id":"1", "name":"name", "tracksCount":"40"}
    ],
    "name":"name"
  }
]

当然，我实现了包含所有字段和类的类Track、Album和Playlist

Tracks {
  String name;
  List<Track> tracks;
}
Albums {
  String name;
  List<Album> albums;
}
Playlists {
  String name;
  List<Playlist> playlists;
}

Gson gson = new Gson();
JsonResponse[] rez = gson.fromJson(str, JsonResponse[].class);

class JsonResponse {
  Albums albums;
  Tracks tracks;
  Playlists playlists;
}

[
  {
    "albums" : [
      {"id":"0", "name":"name"},
      {"id":"1", "name":"name"}
    ],
    "name":"name"
  }
 ]

顺便说一句，我不能改变JSON。所以我需要一个代码来解析它。

Answer 1

最近我使用了RuntimeTypeAdapterFactory来实现同样的目的，它是一个简单的干净的解决方案。它是一个开放的Gson集成（额外）

请查看本文中的active example https://jansipke.nl/serialize-and-deserialize-a-list-of-polymorphic-objects-with-gson/I将原始代码从github直接导入到我的项目中（因为类不直接拥有maven依赖项）：

代码https://raw.githubusercontent.com/google/gson/master/extras/src/main/java/com/google/gson/typeAdapters/runtimetypeAdapterFactory.java

希望有所帮助