解析来自YouTube API的JSON

Question

我有一个URL: https://gdata.youtube.com/feeds/api/users/charlieissocoollike/uploads?alt=jsonc&v=2，它提供来自用户的最新youtube上传的JSON信息。

我写了一些代码来解析这个JSON数据，但我不明白JSON是如何工作的，以及如何在Java中解析它。

public void getVideoData() throws ClientProtocolException, JSONException, IOException {
    JSONObject object = (JSONObject) new JSONTokener(getVideoJSON().toString()).nextValue();
    //String query = object.getString("data");
    JSONArray locations = object.getJSONArray("data");
    output.setText(locations.getString(1));
}
public JSONObject getVideoJSON () throws ClientProtocolException, IOException, JSONException {
    final String URL = "https://gdata.youtube.com/feeds/api/users/charlieissocoollike/uploads?alt=jsonc&v=2";
    StringBuilder url = new StringBuilder(URL);
    HttpGet get = new HttpGet(url.toString());      
    HttpResponse r = client.execute(get);       
    int status = r.getStatusLine().getStatusCode();
        HttpEntity e = r.getEntity();           
        String data = EntityUtils.toString(e);          
        JSONArray VideoData = new JSONArray(data);      
        JSONObject video = VideoData.getJSONObject(0);  
        return video;           
}

如何从每个视频对象的JSON数据中提取视频id，标题和描述?

Answer 1

In http://www.json.org/有一个用JAVA实现的解析器

Answer 2

你就快成功了。你需要的是:

JSONObject json = new JSONObject(data);
JSONObject dataObject = json.getJSONObject("data"); // this is the "data": { } part
JSONArray items = dataObject.getJSONArray("items"); // this is the "items: [ ] part

然后你可以遍历每个视频:

for (int i = 0; i < items.length(); i++) {
    JSONObject videoObject = items.getJSONObject(i); 
    String title = videoObject.getString("title");
    String videoId = videoObject.getString("id");
}

Answer 3

您最好使用官方客户端库:http://code.google.com/apis/youtube/2.0/developers_guide_java.html#Retrieving_user_activity_feeds