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@JsonProperty("game_name"): 给字段起别名； @JsonInclude(JsonInclude.Include.NON_NULL): 字段如果空值，json中不返回

data class Game(val id:Int,
                @JsonProperty("wowo")
                @JsonInclude(JsonInclude.Include.NON_NULL)
                val name: String?){


[
  {
    "id": 1,
    "wowo": "csgo"
  },
  {
    "id": 2
  }
]