Question

我想用KON使用GSON对json进行反序列化。但它返回Null。 Json从对象开始。

这是Json

    val json = """{
        "05-04-2018": [
        {
            "start_datetime": "2018-04-05 20:00:00",
            "event_id": "1",
            "event_title": "Anna Karenina",
            "city_id": "1",
            "stage_name": "Cüneyt Gökçer Sahnesi",
            "address": "Çayyolu Ankara"
        }
        ],
        "07-04-2018": [
        {
            "start_datetime": "2018-04-07 15:00:00",
            "event_id": "1",
            "event_title": "Anna Karenina",
            "city_id": "1",
            "stage_name": "Cüneyt Gökçer Sahnesi",
            "address": "Çayyolu Ankara"
        },
        {
            "start_datetime": "2018-04-07 20:00:00",
            "event_id": "1",
            "event_title": "Anna Karenina",
            "city_id": "1",
            "stage_name": "Cüneyt Gökçer Sahnesi",
            "address": "Çayyolu Ankara"
        }
        ]
    }"""

包含事件列表的类。另一个是项目类别。

    data class Event (val event_id: Int,val event_title: String, val event_stage: String, val event_posterUri: String, val event_starttime: String)
    data class EventArray (val dates: String, val eventArrayList: ArrayList<Event>)

和GSON部分

    val sadasd: EventArray = gson.fromJson(json, EventArray::class.java)

Answer 1

请重试这些数据类：

data class EventArray(
        val `05-04-2018`: List<Event>,
        val `07-04-2018`: List<Event>
)

data class Event(
        val start_datetime: String,
        val event_id: String,
        val event_title: String,
        val city_id: String,
        val stage_name: String,
        val address: String
)

使用这些数据类，我运行println(Gson().fromJson(json, EventArray::class.java))并获取：

EventArray(05-04-2018=[Event(start_datetime=2018-04-05 20:00:00, event_id=1, event_title=Anna Karenina, city_id=1, stage_name=Cüneyt Gökçer Sahnesi, address=Çayyolu Ankara)], 07-04-2018=[Event(start_datetime=2018-04-07 15:00:00, event_id=1, event_title=Anna Karenina, city_id=1, stage_name=Cüneyt Gökçer Sahnesi, address=Çayyolu Ankara), Event(start_datetime=2018-04-07 20:00:00, event_id=1, event_title=Anna Karenina, city_id=1, stage_name=Cüneyt Gökçer Sahnesi, address=Çayyolu Ankara)])

Answer 2

所以我理解日期是动态的。如果您无法更改API设计，这是一种方法。

使用JsonParser解析JSON，如下所示：

val parsedJson = JsonParser().parse(json).asJsonObject

从此

中提取密钥

val keys = parsedJson.keySet();

遍历键，将内容提取为JsonArray，然后迭代每个键并将其映射到类。

for (key in keys) {
        var eventArray = parsedJson[key].asJsonArray
        eventArray.forEach {
            val event = Gson().fromJson(it.asJsonObject, Event::class.java)
            print(event)
        }
    }

理想情况下，您希望开始使用更好的JSON。

Json在kotlin中用Gson进行反序列化

2 个答案: