Question

我正在尝试从Java中的URL获取JSON，并输出结果。这是我的json，来自www.thebluealliance.com/api/v2/match/2015arc_qm1。我想获得match_number，以及来自蓝色和红色联盟的分数，并将其打印到我的控制台。我使用的是GSON（Google JSON）。例如，我希望此代码返回1,91,97 ...

{
  "comp_level": "qm",
  "match_number": 1,
  "videos": [],
  "time_string": null,
  "set_number": 1,
  "key": "2015arc_qm1",
  "time": 1429795800,
  "score_breakdown": {
    "blue": {
      "auto": 0,
      "foul": 12
    },
    "red": {
      "auto": 0,
      "foul": 0
    }
  },
  "alliances": {
    "blue": {
      "score": 91,
      "teams": [
        "frc1706",
        "frc2907",
        "frc2363"
      ]
    },
    "red": {
      "score": 97,
      "teams": [
        "frc2914",
        "frc360",
        "frc207"
      ]
    }
  },
  "event_key": "2015arc"
}

我的Java代码可以在下面找到

Gson gson = new Gson();
String sURL = "http://www.thebluealliance.com/api/v2/match/2015arc_qm
                1?X-TBA-App-Id=frc1810:alex-webber:v01";
URL url = new URL(sURL);
HttpURLConnection request = (HttpURLConnection) url.openConnection();
request.connect();
JsonParser jp = new JsonParser();
JsonElement root = jp.parse(new InputStreamReader((InputStream) request
                .getContent()));
JsonObject rootobj = root.getAsJsonObject();
JsonElement results = rootobj
                .getAsJsonObject().get("match_number")
                .getAsJsonObject().getAsJsonArray("alliances").get(4)
                .getAsJsonObject().getAsJsonArray("blue").getAsJsonObject().get("score");
String match = results.getAsString();

Answer 1

尝试这个，我没有测试它，但是从我在你的JSON文档中看到的，你的代码中有几个问题，联盟不是一个json数组，蓝色和红色也不是json数组，它们是基于我在json文档中看到的json对象，

JsonObject rootobj = root.getAsJsonObject();
JsonElement match_number = rootobj.get("match_number");
JsonObject alliances = rootobj.getAsJsonObject("alliances");
JsonElement blue = alliances.getAsJsonObject("blue").get("score");
JsonElement red  = alliances.getAsJsonObject("red").get("score");

System.out.println(match_number.getAsString()+","+blue.getAsString()+","+red.getAsString());

从URL协助JSON

1 个答案: