java - 无法使用播放列表项 API 检索视频元数据(例如视频持续时间和流 url)？

Question

问题陈述

1)我是实现 youtube api 的初学者，我想检索 VideoMetaData，例如视频持续时间和流 url。

我的分析:

1)我使用youtube api来检索此元数据，例如视频倾斜度、视频ID和创建日期。

2)问题是我无法在响应中看到其他数据，例如视频持续时间和流 URL。

//另外，StartTime 和 EndTime 已被折旧。所以我找不到持续时间

Then,how can I fetch these details related to video.

以下是我收到的回复。

https://developers.google.com/apis-explorer/#p/youtube/v3/youtube.playlistItems.list?part=snippet%252CcontentDetails&maxResults=25&playlistId=PL8WtjSOdakGuBu0q9EKLXndc4jcAQxs2Y&_h=1&

相同的代码:

public class Search1 {
private static YouTube.PlaylistItems.List playlistItemRequest;
private static String PLAYLIST_ID = "PL8WtjSOdakGuBu0q9EKLXndc4jcAQxs2Y";
private static final Long NUMBER_OF_VIDEOS_RETURNED = (long) 10;    
private static String apiKey="AIzaSyDJAaPLW5wbWdfKX6CjfvSo5yrF3K3rlwc";
private static YouTube youtube;

public static void main(String s[]){
youtube = new YouTube.Builder(new NetHttpTransport(),
        new JacksonFactory(), new HttpRequestInitializer()
{
    @Override
    public void initialize(HttpRequest hr) throws IOException {}
}).setApplicationName("youtube-cmdline-search-sample").build();
List<PlaylistItem> playlistItemList = new ArrayList<PlaylistItem>();
try
{
    playlistItemRequest = youtube.playlistItems().list("snippet,contentDetails");
    playlistItemRequest.setPlaylistId(PLAYLIST_ID);
    playlistItemRequest.setFields("items(snippet/title,snippet/playlistId,snippet/publishedAt,snippet/description,snippet/thumbnails/default/url,contentDetails/videoId,contentDetails/startAt,contentDetails/endAt,contentDetails/videoPublishedAt),nextPageToken,pageInfo");
    playlistItemRequest.setKey(apiKey);
//        videoItem.setId(item.getContentDetails().getVideoId());

    String nextToken = "";
    do {
        playlistItemRequest.setPageToken(nextToken);
        PlaylistItemListResponse playlistItemResult = playlistItemRequest.execute();

        playlistItemList.addAll(playlistItemResult.getItems());

        nextToken = playlistItemResult.getNextPageToken();
    } while (nextToken != null);
}catch(IOException e)
{
    System.out.println("Exception"+e);
}
    Iterator iteratorSearchResults=playlistItemList.iterator();
    while (iteratorSearchResults.hasNext()) {

        PlaylistItem playlist =  (PlaylistItem) iteratorSearchResults.next();
//          String duration=(playlist.getContentDetails().getStartAt()-playlist.getContentDetails().getEndAt());
        System.out.println(" Title: " + playlist.getSnippet().getTitle());
        System.out.println(" Video Created Date" + playlist.getContentDetails().getVideoPublishedAt());

        System.out.println(" PlayList ID: " + playlist.getSnippet().getPlaylistId());
        System.out.println(" Video ID: " + playlist.getContentDetails().getVideoId());

        System.out.println(" Stream url of PlayList: ");
        System.out.println(" Start Time: " + playlist.getContentDetails().getStartAt());
        System.out.println(" End Time: " + playlist.getContentDetails().getEndAt());
        System.out.println(" Duration " );

}      
}
}

Answer 1

我遇到了同样的问题，并按照以下步骤检索持续时间。请注意，我必须仅针对视频持续时间提出单独的请求。 首先，我必须使用视频 ID 读取 json 响应，当然还有“部分”和我的 APIkey。这里的部分是“contentDetails”

String retrieveVideoJSON(String videoID, String part, String APIkey) {
    String postURL = "https://www.googleapis.com/youtube/v3/videos?id=" + videoID + "&part=" + part + "&key=" + APIkey;
    String output = "";
    try {
        URL url = new URL(postURL);
        HttpURLConnection conn = (HttpURLConnection) url.openConnection();
        BufferedReader br1 = new BufferedReader(new InputStreamReader(
                (conn.getInputStream())));
        String line1;
        while ((line1 = br1.readLine()) != null) {
            output = output + line1;
        }
        conn.disconnect();
        br1.close();

    } catch (IOException e) {
        System.out.println("\ne = " + e.getMessage() + "\n");
    }
    return output;

}

然后我使用 org.json api 中的 JSONObject 类来解析 json 并获取持续时间

String videoJSON = retrieveVideoJSON(videoID, "contentDetails", myAPIkey);
    JSONObject jsonObj = new JSONObject(videoJSON).getJSONArray("items").getJSONObject(0).getJSONObject("contentDetails");
    long seconds = Duration.parse(jsonObj.getString("duration")).getSeconds();

您可以注意到我使用 java.time.Duration 对象将持续时间格式解析为秒。它的可用 ID 是 JDK 1.8我希望它对某人有帮助