Question

我需要从播放列表中获取YouTube视频。

如何从播放列表中获取项目？有没有一种将它们解析为列表的方法（这样我就可以从中过滤出特定的视频）？我正在使用Java。如果您有一个不错的教程或类似的东西，我将非常高兴！

Answer 1

查看YoutubeAPI的PlayListItems here和here的文档。

您可以导入Google的API library，并使用此示例代码来调用特定播放列表的YoutubeAPI，它将返回一个包含播放列表信息的JSON文件。

// Sample Java code for user authorization

import com.google.api.client.auth.oauth2.Credential;
import com.google.api.client.extensions.java6.auth.oauth2.AuthorizationCodeInstalledApp;
import com.google.api.client.extensions.jetty.auth.oauth2.LocalServerReceiver;
import com.google.api.client.googleapis.auth.oauth2.GoogleAuthorizationCodeFlow;
import com.google.api.client.googleapis.auth.oauth2.GoogleClientSecrets;
import com.google.api.client.googleapis.javanet.GoogleNetHttpTransport;
import com.google.api.client.googleapis.json.GoogleJsonResponseException;
import com.google.api.client.http.HttpTransport;
import com.google.api.client.json.jackson2.JacksonFactory;
import com.google.api.client.json.JsonFactory;
import com.google.api.client.util.store.FileDataStoreFactory;

import com.google.api.services.youtube.YouTubeScopes;
import com.google.api.services.youtube.model.*;
import com.google.api.services.youtube.YouTube;

import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.Arrays;
import java.util.Collection;
import java.util.HashMap;
import java.util.List;


public class ApiExample {

    /** Application name. */
    private static final String APPLICATION_NAME = "API Sample";

    /** Directory to store user credentials for this application. */
    private static final java.io.File DATA_STORE_DIR = new java.io.File(
            System.getProperty("user.home"), ".credentials/java-youtube-api-tests");

    /** Global instance of the {@link FileDataStoreFactory}. */
    private static FileDataStoreFactory DATA_STORE_FACTORY;

    /** Global instance of the JSON factory. */
    private static final JsonFactory JSON_FACTORY = JacksonFactory.getDefaultInstance();

    /** Global instance of the HTTP transport. */
    private static HttpTransport HTTP_TRANSPORT;

    /** Global instance of the scopes required by this quickstart.
     *
     * If modifying these scopes, delete your previously saved credentials
     * at ~/.credentials/drive-java-quickstart
     */
    private static final Collection<String> SCOPES = Arrays.asList("YouTubeScopes.https://www.googleapis.com/auth/youtube.force-ssl YouTubeScopes.https://www.googleapis.com/auth/youtubepartner");

    static {
        try {
            HTTP_TRANSPORT = GoogleNetHttpTransport.newTrustedTransport();
            DATA_STORE_FACTORY = new FileDataStoreFactory(DATA_STORE_DIR);
        } catch (Throwable t) {
            t.printStackTrace();
            System.exit(1);
        }
    }

    /**
     * Creates an authorized Credential object.
     * @return an authorized Credential object.
     * @throws IOException
     */
    public static Credential authorize() throws IOException {
        // Load client secrets.
        InputStream in = ApiExample.class.getResourceAsStream("/client_secret.json");
        GoogleClientSecrets clientSecrets = GoogleClientSecrets.load(JSON_FACTORY, new InputStreamReader( in ));

        // Build flow and trigger user authorization request.
        GoogleAuthorizationCodeFlow flow = new GoogleAuthorizationCodeFlow.Builder(
                HTTP_TRANSPORT, JSON_FACTORY, clientSecrets, SCOPES)
                .setDataStoreFactory(DATA_STORE_FACTORY)
                .setAccessType("offline")
                .build();
        Credential credential = new AuthorizationCodeInstalledApp(
                flow, new LocalServerReceiver()).authorize("user");
        System.out.println(
                "Credentials saved to " + DATA_STORE_DIR.getAbsolutePath());
        return credential;
    }

    /**
     * Build and return an authorized API client service, such as a YouTube
     * Data API client service.
     * @return an authorized API client service
     * @throws IOException
     */
    public static YouTube getYouTubeService() throws IOException {
        Credential credential = authorize();
        return new YouTube.Builder(
                HTTP_TRANSPORT, JSON_FACTORY, credential)
                .setApplicationName(APPLICATION_NAME)
                .build();
    }

    public static void main(String[] args) throws IOException {

        YouTube youtube = getYouTubeService();

        try {
            HashMap<String, String> parameters = new HashMap<>();
            parameters.put("part", "snippet,contentDetails");
            parameters.put("maxResults", "25");
            parameters.put("playlistId", "PLBCF2DAC6FFB574DE");

            YouTube.PlaylistItems.List playlistItemsListByPlaylistIdRequest = youtube.playlistItems().list(parameters.get("part").toString());
            if (parameters.containsKey("maxResults")) {
                playlistItemsListByPlaylistIdRequest.setMaxResults(Long.parseLong(parameters.get("maxResults").toString()));
            }

            if (parameters.containsKey("playlistId") && parameters.get("playlistId") != "") {
                playlistItemsListByPlaylistIdRequest.setPlaylistId(parameters.get("playlistId").toString());
            }

            PlaylistItemListResponse response = playlistItemsListByPlaylistIdRequest.execute();
            System.out.println(response);


        } catch (GoogleJsonResponseException e) {
            e.printStackTrace();
            System.err.println("There was a service error: " + e.getDetails().getCode() + " : " + e.getDetails().getMessage());
        } catch (Throwable t) {
            t.printStackTrace();
        }
    }
}

在该代码中，maxResults到您想要的结果大小，playlistId到可以在网址中找到的youtube播放列表的ID。（即此播放列表https://www.youtube.com/playlist?list=PLBCF2DAC6FFB574DE的ID为PLBCF2DAC6FFB574DE）

如何使用Java通过计数从youtube播放列表中获取视频？

1 个答案: