Java 使用多个级别解析JSON对象

我知道这已经被问了很多次了，我已经阅读了几十个问题和答案，但由于某些原因，我无法让我的代码工作，所以请不要关闭这个问题。以下是http get请求返回的JSON对象：

{
  "tracks" : {
    "href" : "https://api.spotify.com/v1/search?query=Closer&offset=0&limit=20&type=track",
    "items" : [ {
      "album" : {
        "album_type" : "single",
        "artists" : [ {
          "external_urls" : {
            "spotify" : "https://open.spotify.com/artist/69GGBxA162lTqCwzJG5jLp"
          },
          "href" : "https://api.spotify.com/v1/artists/69GGBxA162lTqCwzJG5jLp",
          "id" : "69GGBxA162lTqCwzJG5jLp",
          "name" : "The Chainsmokers",
          "type" : "artist",
          "uri" : "spotify:artist:69GGBxA162lTqCwzJG5jLp"
        } ],
        "available_markets" : [ "AD", "AR", "AT", "AU", "BE", "BG", "BO", "BR", "CA", "CH", "CL", "CO", "CR", "CY", "CZ", "DE", "DK", "DO", "EC", "EE", "ES", "FI", "FR", "GB", "GR", "GT", "HK", "HN", "HU", "ID", "IE", "IS", "IT", "JP", "LI", "LT", "LU", "LV", "MC", "MT", "MX", "MY", "NI", "NL", "NO", "NZ", "PA", "PE", "PH", "PL", "PT", "PY", "SE", "SG", "SK", "SV", "TR", "TW", "US", "UY" ],
        "external_urls" : {
          "spotify" : "https://open.spotify.com/album/0rSLgV8p5FzfnqlEk4GzxE"
        },
        "href" : "https://api.spotify.com/v1/albums/0rSLgV8p5FzfnqlEk4GzxE",
        "id" : "0rSLgV8p5FzfnqlEk4GzxE",
        "images" : [ {
          "height" : 640,
          "url" : "https://i.scdn.co/image/512bd22e2bc73f9883b8612daf4f23acaac3c776",
          "width" : 640
        }, {
          "height" : 300,
          "url" : "https://i.scdn.co/image/2e244b9284d317b2019bb9fd44d9a086210d4974",
          "width" : 300
        }, {
          "height" : 64,
          "url" : "https://i.scdn.co/image/57ba46d39d710e99ae524b279cae3a3981ace43f",
          "width" : 64
        } ],
        "name" : "Closer",
        "type" : "album",
        "uri" : "spotify:album:0rSLgV8p5FzfnqlEk4GzxE"
      },
      "artists" : [ {
        "external_urls" : {
          "spotify" : "https://open.spotify.com/artist/69GGBxA162lTqCwzJG5jLp"
        },
        "href" : "https://api.spotify.com/v1/artists/69GGBxA162lTqCwzJG5jLp",
        "id" : "69GGBxA162lTqCwzJG5jLp",
        "name" : "The Chainsmokers",
        "type" : "artist",
        "uri" : "spotify:artist:69GGBxA162lTqCwzJG5jLp"
      }, {
        "external_urls" : {
          "spotify" : "https://open.spotify.com/artist/26VFTg2z8YR0cCuwLzESi2"
        },
        "href" : "https://api.spotify.com/v1/artists/26VFTg2z8YR0cCuwLzESi2",
        "id" : "26VFTg2z8YR0cCuwLzESi2",
        "name" : "Halsey",
        "type" : "artist",
        "uri" : "spotify:artist:26VFTg2z8YR0cCuwLzESi2"
      } ],
      "available_markets" : [ "AD", "AR", "AT", "AU", "BE", "BG", "BO", "BR", "CA", "CH", "CL", "CO", "CR", "CY", "CZ", "DE", "DK", "DO", "EC", "EE", "ES", "FI", "FR", "GB", "GR", "GT", "HK", "HN", "HU", "ID", "IE", "IS", "IT", "JP", "LI", "LT", "LU", "LV", "MC", "MT", "MX", "MY", "NI", "NL", "NO", "NZ", "PA", "PE", "PH", "PL", "PT", "PY", "SE", "SG", "SK", "SV", "TR", "TW", "US", "UY" ],
      "disc_number" : 1,
      "duration_ms" : 244960,
      "explicit" : false,
      "external_ids" : {
        "isrc" : "USQX91601347"
      },
      "external_urls" : {
        "spotify" : "https://open.spotify.com/track/7BKLCZ1jbUBVqRi2FVlTVw"
      },
      "href" : "https://api.spotify.com/v1/tracks/7BKLCZ1jbUBVqRi2FVlTVw",
      "id" : "7BKLCZ1jbUBVqRi2FVlTVw",
      "name" : "Closer",
      "popularity" : 100,
      "preview_url" : "https://p.scdn.co/mp3-preview/8d3df1c64907cb183bff5a127b1525b530992afb?cid=null",
      "track_number" : 1,
      "type" : "track",
      "uri" : "spotify:track:7BKLCZ1jbUBVqRi2FVlTVw"
    }, {

从底部向上的8行是我想要的信息，id:

7BKLCZ1JBUBVQRI2FFLTVW

。下面是我当前使用的java代码，后面是它返回的内容：

JSONObject jObj;
JSONObject tracks;
JSONArray items;
JSONObject id;

jObj = new JSONObject(json);    // json is the JSON string
tracks = (JSONObject) jObj.get("tracks");
items = (JSONArray) tracks.get("items");
id = items.getJSONObject(9);    // index 9 because the id is the 10th child in the structure.
Log.d("testJson", id.toString());

这是它返回的内容（很抱歉，它的格式不好）：

---

我想知道为什么它返回所有这些信息，而不是歌曲本身的id？我该怎么做？谢谢

项目

是一个对象数组。。。因此，

items.getJSONObject（9）

将返回第10个项，这是一个包含属性名“id”的对象

在另一种情况下，要获取Id，您需要以下内容：

JSONObject jObj;
JSONObject tracks;
JSONArray items;
String id;

jObj = new JSONObject(json);    // json is the JSON string
tracks = (JSONObject) jObj.get("tracks");
items = (JSONArray) tracks.get("items");
id = items.getJSONObject(9).getString("id");

---

非常感谢你！我所要做的就是将getJSONObject（9）更改为getJSONObject（0）。我以前把它搞砸了

JSONObject jObj;
JSONObject tracks;
JSONArray items;
String id;

jObj = new JSONObject(json);    // json is the JSON string
tracks = (JSONObject) jObj.get("tracks");
items = (JSONArray) tracks.get("items");
id = items.getJSONObject(9).getString("id");