我試圖解析Spotify的web服務響應得到一個藝術家的曲目是這樣的:解析JSON的web服務響應與GSON(預期BEGIN_OBJECT但BEGIN_ARRAY)
{
"info": {
"num_results": 2974,
"limit": 100,
"offset": 0,
"query": "foo",
"type": "track",
"page": 1
},
"tracks": [
{
"album": {
"released": "2009",
"href": "spotify:album:1zCNrbPpz5OLSr6mSpPdKm",
"name": "Greatest Hits",
"availability": {
"territories": "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 IE IS IT LI LT LU LV MC MT MX MY NI NL NO NZ PA PE PH PL PT PY RO SE SG SI SK SV TR TW US UY"
}
},
"name": "Everlong",
"popularity": "0.79",
"external-ids": [
{
"type": "isrc",
"id": "USRW29600011"
}
],
"length": 249.986,
"href": "spotify:track:07q6QTQXyPRCf7GbLakRPr",
"artists": [
{
"href": "spotify:artist:7jy3rLJdDQY21OgRLCZ9sD",
"name": "Foo Fighters"
}
],
"track-number": "3"
}]
}
我現在用的是Gson庫來做到這一點。到目前爲止,我已經在我的Java代碼嘗試這樣做:
JsonParser parser = new JsonParser();
JsonObject jObject = parser.parse(jsonString).getAsJsonObject();
JsonArray jArray = jObject.get("tracks") .getAsJsonArray();
Gson gson = new Gson();
List<Track> trackArr = new ArrayList<Track>();
Type collectiontype = new TypeToken<Collection<Track>>(){}.getType();
Collection<Track> trackColl = gson.fromJson(jArray.toString(), collectiontype);
但我得到的錯誤:com.google.gson.JsonSyntaxException:java.lang.IllegalStateException:預期BEGIN_OBJECT但BEGIN_ARRAY
我不不明白爲什麼它期望開始對象,如果我正在做「getAsJsonArray()」,當試圖獲取「track」對象時,json字符串中的數組是[]。
「跟蹤」當時我在一個循環中這樣做是爲了讓所有的曲目到一個數組列表:
for (JsonElement jsonElement : jArray) {
Type collectiontype = new TypeToken<Collection<Track>>(){}.getType();
Collection<Track> trackCol = gson.fromJson(jsonElement, collectiontype);
trackArr.add((Track) trackCol);
}
什麼我doind錯在這裏? 我很欣賞任何指導。