Question

我正在尝试访问以下JSON中的“display_name”对象，我似乎无法抓住它。示例JSON如下所示。

{
  "streams": [
    {
      "broadcaster": "fme",
      "_id": 5019229776,
      "preview": "http://static-cdn.jtvnw.net/previews-ttv/live_user_zisss-320x200.jpg",
      "game": "Diablo III",
      "channel": {
        "mature": null,
        "background": "http://static-cdn.jtvnw.net/jtv_user_pictures/zisss-channel_background_image-06a9d8c1113e5b45.jpeg",
        "updated_at": "2013-03-04T05:27:27Z",
        "_id": 31795858,
        "status": "Barb sets giveaway and making 500m DH set... Join Zisspire, earn Zeny, collect prizes!",
        "logo": "http://static-cdn.jtvnw.net/jtv_user_pictures/zisss-profile_image-502d7c865c5e3a54-300x300.jpeg",
        "teams": [ ],
        "url": "http://www.twitch.tv/zisss",
        "display_name": "Zisss",
        "game": "Diablo III",
        "banner": "http://static-cdn.jtvnw.net/jtv_user_pictures/zisss-channel_header_image-997348d7f0658115-640x125.jpeg",
        "name": "zisss",
        "video_banner": null,
        "_links": {
          "chat": "https://api.twitch.tv/kraken/chat/zisss",
          "subscriptions": "https://api.twitch.tv/kraken/channels/zisss/subscriptions",
          "features": "https://api.twitch.tv/kraken/channels/zisss/features",
          "commercial": "https://api.twitch.tv/kraken/channels/zisss/commercial",
          "stream_key": "https://api.twitch.tv/kraken/channels/zisss/stream_key",
          "editors": "https://api.twitch.tv/kraken/channels/zisss/editors",
          "videos": "https://api.twitch.tv/kraken/channels/zisss/videos",
          "self": "https://api.twitch.tv/kraken/channels/zisss",
          "follows": "https://api.twitch.tv/kraken/channels/zisss/follows"
        },
        "created_at": "2012-07-01T21:09:58Z"
      },
      "name": "live_user_zisss",
      "viewers": 775,
      "_links": {
        "self": "https://api.twitch.tv/kraken/streams/zisss"
      }
    }
  ],
  "_links": {
    "summary": "https://api.twitch.tv/kraken/streams/summary",
    "followed": "https://api.twitch.tv/kraken/streams/followed",
    "next": "https://api.twitch.tv/kraken/streams?channel=zisss%2Cvoyboy&game=Diablo+III&limit=100&offset=100",
    "featured": "https://api.twitch.tv/kraken/streams/featured",
    "self": "https://api.twitch.tv/kraken/streams?channel=zisss%2Cvoyboy&game=Diablo+III&limit=100&offset=0"
  }

我从：

开始

JSONArray array = getJSONArray("streams");
JSONObject object = array.getJSONObject(4); // channel is entry 4 in array
String name = object.getString("display_name");

我不确定我在这里做错了什么。使用更多填充的JSON和多个“频道”条目，我不知道如何处理它。我在想这样的事情？

String[] name = new String[array.length()];
JSONArray array = getJSONArray("streams");
for(int i = 0; i < array.length(); i++) {
    if(array[i].equals("channel")
        name[i] = array.getString("display_name");

我确信最后一部分是粗糙的，可能与它本应该完全不同，但我不知道如何处理它。

Answer 1

根据您的JSON，您必须执行以下操作

JSONArray array = getJSONArray("streams");
JSONObject object = array.getJSONObject(0); 
object = object.getJSONOBject("channel")
String name = object.getString("display_name");

json数组中的第一项包含通道对象，其中包含您要查找的数据。

Answer 2

频道不是JSONArray中的第4项，而是第一项中的嵌套对象。在解析JSON时，您必须小心遵循[]和{}括号，因为JSONObjects可以包含多个嵌套的子对象和数组。

JSONObject mainJsonObject = new JSONObject(json_string);
JSONArray array = mainJsonObject.getJSONArray("streams");
JSONObject channelObject = array.getJSONObject(0).getJSONOBject("channel")
String displayName = channelObject.getString("display_name");

无法在JSON中访问对象

2 个答案: