将Foursquare HTTP响应转换为JSON的Java

StackOverflow https://stackoverflow.com/questions/8319058

  •  25-10-2019
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题

在收到Foursquare的以下答复之后，当我尝试解析它时，我在下面收到错误：

回复：

{"meta":{"code":200},"response":{"venues":[{"id":"4b1c3ce9f964a520d60424e3","name":"Folsom Lake Bowl","contact":{},"location":{"address":"511 East Bidwell","lat":38.67291745,"lng":-121.165447,"distance":39,"postalCode":"95630","city":"Folsom","state":"CA"},"categories":[{"id":"4bf58dd8d48988d1e4931735","name":"Bowling Alley","pluralName":"Bowling Alleys","shortName":"Bowling Alley","icon":{"prefix":"https://foursquare.com/img/categories/arts_entertainment/bowling_","sizes":[32,44,64,88,256],"name":".png"},"primary":true}],"verified":false,"stats":{"checkinsCount":592,"usersCount":284,"tipCount":2},"hereNow":{"count":0}}]}}

错误：

Exception in thread "main" org.codehaus.jettison.json.JSONException: JSONObject["groups"] not found.
at org.codehaus.jettison.json.JSONObject.get(JSONObject.java:360)
at org.codehaus.jettison.json.JSONObject.getJSONArray(JSONObject.java:436)
at playaround.FoursquareAPI.get(FoursquareAPI.java:56)
at playaround.FoursquareAPI.main(FoursquareAPI.java:31)

代码：

StringBuilder sb = new StringBuilder();
        BufferedReader reader = new BufferedReader(new InputStreamReader(response.getEntity().getContent()));
        for (String line; null != (line = reader.readLine());) {
            sb.append(line);
        }
        String output = sb.toString();
        JSONObject json = new JSONObject(output);
        JSONArray venues = json.getJSONObject("response").getJSONArray("groups").getJSONObject(0).getJSONArray("items");
        System.out.println(venues.length());

我想要的就是阅读Java中的Jonobject的Foursquare的响应。有帮助吗？

有帮助吗？

解决方案

阅读堆栈痕迹，解析的JSON很好。

问题是您正在尝试阅读不存在的属性 - “群体”

其他提示

根据我的经验，如果您获得了JSON对象 - 例如我遇到的问题；解析返回的位置字段。我从以下代码开始：

JSONObject jsonObjLoc = new JSONObject(myLocation);

如果您可以获取对象，则只需参考“ hom hom”参数类似：

if(jsonObjLoc.has("myAddress")) { // name of field to look for 

           myTextAddress = jsonObjLoc.getString("address");
}

我使用必须防止未返回的空场或空字段。

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