我使用Java编码,并使用minimal-json库。我试图从json文本中获取一些信息(如果它是数组,则为idk)。获取Json信息
我试图访问“流”内的“游戏”值,但我总是通过nullpointer或parseexception得到崩溃。
这里是我想要得到的JSON字符串(从抽搐API):
{"_links":{"self":"https://api.twitch.tv/kraken/streams/hackerc0w","channel":"https://api.twitch.tv/kraken/channels/hackerc0w"},"stream":{"_id":13817896816,"game":"Programming","viewers":13,"created_at":"2015-04-01T13:54:54Z","video_height":1080,"average_fps":59.9235368156,"_links":{"self":"https://api.twitch.tv/kraken/streams/hackerc0w"},"preview":{"small":"http://static-cdn.jtvnw.net/previews-ttv/live_user_hackerc0w-80x45.jpg","medium":"http://static-cdn.jtvnw.net/previews-ttv/live_user_hackerc0w-320x180.jpg","large":"http://static-cdn.jtvnw.net/previews-ttv/live_user_hackerc0w-640x360.jpg","template":"http://static-cdn.jtvnw.net/previews-ttv/live_user_hackerc0w-{width}x{height}.jpg"},"channel":{"_links":{"self":"https://api.twitch.tv/kraken/channels/hackerc0w","follows":"https://api.twitch.tv/kraken/channels/hackerc0w/follows","commercial":"https://api.twitch.tv/kraken/channels/hackerc0w/commercial","stream_key":"https://api.twitch.tv/kraken/channels/hackerc0w/stream_key","chat":"https://api.twitch.tv/kraken/chat/hackerc0w","features":"https://api.twitch.tv/kraken/channels/hackerc0w/features","subscriptions":"https://api.twitch.tv/kraken/channels/hackerc0w/subscriptions","editors":"https://api.twitch.tv/kraken/channels/hackerc0w/editors","videos":"https://api.twitch.tv/kraken/channels/hackerc0w/videos","teams":"https://api.twitch.tv/kraken/channels/hackerc0w/teams"},"background":null,"banner":null,"broadcaster_language":"en","display_name":"hackerc0w","game":"Programming","logo":null,"mature":false,"status":"Coding a Chatbot in C","partner":false,"url":"http://www.twitch.tv/hackerc0w","video_banner":null,"_id":41236491,"name":"hackerc0w","created_at":"2013-03-11T17:08:22Z","updated_at":"2015-04-01T17:17:44Z","delay":0,"followers":28,"profile_banner":null,"profile_banner_background_color":null,"views":2948,"language":"de"}}}
我如果livestreamer是生活的方式是这样的:
public static boolean isStreamLive(String channel) { try { URL url = new URL(TWITCH_STREAM.replace("$c$", channel))); URLConnection conn = url.openConnection(); BufferedReader br = new BufferedReader(new InputStreamReader(conn.getInputStream())); String inputLine = br.readLine(); br.close(); JsonObject jsonObj = JsonObject.readFrom(inputLine); return (jsonObj.get("stream").isNull())?false:true; } catch (IOException e) { return false; } }
我主要试图复制上面的方法。但我一直在检查图书馆的文件以了解并且我一直在尝试很多事情。
最后是这样的:
public static String checkGame(String channel) { if (!isStreamLive(channel)) return "El Estreamer esta Offline!"; try { URL url = new URL( insertChannel(TWITCH_STREAM, channel)); URLConnection conn = url.openConnection(); BufferedReader br = new BufferedReader(new InputStreamReader(conn.getInputStream())); String inputLine = br.readLine(); br.close(); JsonObject object = JsonObject.readFrom(inputLine); JsonValue value = object.get("stream").asObject(); String msg = value.valueOf("status").toString(); return msg; } catch (IOException e) { return "Algo raro paso :/ error: 3"; } return channel; }
BTW忽视频道,不是我的频道,它的朋友 – CavariuX 2015-04-01 18:02:53
崩溃的那一行是我获得的价值,也是编辑 – CavariuX 2015-04-01 18:19:27
thnxs @azurefrog编辑 – CavariuX 2015-04-01 18:28:32