如何从外部目录 java 调用 client_secrets.json？

Question

我基本上有一个动态 WEB-APP，它通过一个 servlet 我试图检索一个 youtube 视频 cmets。

虽然网上有很多关于它的文章，但我不知道为什么没有一个对我有用。

第一次尝试：

private static int counter = 0;
private static YouTube youtube;

public static void getYoutubeOauth() throws Exception {
    List<String> scopes = Lists.newArrayList("https://www.googleapis.com/auth/youtube.force-ssl");

    Credential credential = Auth.authorize(scopes, "commentthreads");
    youtube = new YouTube.Builder(Auth.HTTP_TRANSPORT, Auth.JSON_FACTORY, credential).build();

    String videoId = "KIgxmV9xXBQ";

    // Get video comments threads
    CommentThreadListResponse commentsPage = prepareListRequest(videoId).execute();

    while (true) {
        handleCommentsThreads(commentsPage.getItems());

        String nextPageToken = commentsPage.getNextPageToken();
        if (nextPageToken == null)
            break;

        // Get next page of video comments threads
        commentsPage = prepareListRequest(videoId).setPageToken(nextPageToken).execute();
    }

    System.out.println("Total: " + counter);
}

有了这个，我在以下行得到了 nullpointerexception：Credential credential = Auth.authorize(scopes, "commentthreads");

如果你能解释一下scope 是什么，你从哪里得到它。

第二次尝试我尝试创建一个不同的函数来获取凭据。

第二次尝试：

   public static final HttpTransport HTTP_TRANSPORT = new NetHttpTransport();
public static final JsonFactory JSON_FACTORY = new JacksonFactory();
private static final String CREDENTIALS_DIRECTORY = ".oauth-credentials";

public static Credential authorize(List<String> scopes, String credentialDatastore) throws IOException {

    // Load client secrets.
    Reader clientSecretReader = new InputStreamReader(
            Auth.class.getResourceAsStream("/home/hazrat/Documents/eclipse-jee-neon-3-linux-gtk-x86_64/eclipse/client_secrets.json"));
    GoogleClientSecrets clientSecrets = GoogleClientSecrets.load(JSON_FACTORY, clientSecretReader);

    // Checks that the defaults have been replaced (Default = "Enter X here").
    if (clientSecrets.getDetails().getClientId().startsWith("Enter")
            || clientSecrets.getDetails().getClientSecret().startsWith("Enter ")) {
        System.out.println(
                "Enter Client ID and Secret from https://console.developers.google.com/project/_/apiui/credential "
                        + "into src/main/resources/client_secrets.json");
        return null;
    }

    // This creates the credentials datastore at ~/.oauth-credentials/${credentialDatastore}
    FileDataStoreFactory fileDataStoreFactory = new FileDataStoreFactory(new File(System.getProperty("user.home") + "/" + CREDENTIALS_DIRECTORY));
    DataStore<StoredCredential> datastore = fileDataStoreFactory.getDataStore(credentialDatastore);

    GoogleAuthorizationCodeFlow flow = new GoogleAuthorizationCodeFlow.Builder(
            HTTP_TRANSPORT, JSON_FACTORY, clientSecrets, scopes).setCredentialDataStore(datastore)
            .build();

    // Build the local server and bind it to port 8080
    LocalServerReceiver localReceiver = new LocalServerReceiver.Builder().setPort(8080).build();

    // Authorize.
    return new AuthorizationCodeInstalledApp(flow, localReceiver).authorize("user");
}

我在Reader clientSecretReader = new InputStreamReader(... 行也收到了一个空指针异常，但如果我在终端中尝试nano /home/hazrat/Documents/eclipse-jee-neon-3-linux-gtk-x86_64/eclipse/client_secrets.json，我可以访问该文件。

问题：如何授权我的网络应用并从外部目录读取 client_secrets.json。

Answer 1

有点痛苦，但让第二个解决方案奏效了。

所以我做错了，我调用了Auth.class.getResourceAsStream，它要求classLoader 可以使用数据，但我的classLoader 却没有。

所以我要做的是从外部目录请求我的 client_secrets.json，然后你必须使用 FileInputStream 而不是 getResourceAsStream。

FileInputStream 和 getResourceAsStream 都可以正常工作，但它们因您的情况和不同的代码而异。

public static final HttpTransport HTTP_TRANSPORT = new NetHttpTransport();
public static final JsonFactory JSON_FACTORY = new JacksonFactory();
private static final String CREDENTIALS_DIRECTORY = ".oauth-credentials";

public static Credential authorize(List<String> scopes, String credentialDatastore) throws IOException {
    Reader clientSecretReader = new InputStreamReader(
            new FileInputStream("/client_secrets.json"));
    GoogleClientSecrets clientSecrets = GoogleClientSecrets.load(JSON_FACTORY, clientSecretReader);
    System.out.println(clientSecretReader.toString());
    if (clientSecrets.getDetails().getClientId().startsWith("Enter")
            || clientSecrets.getDetails().getClientSecret().startsWith("Enter ")) {
        System.out.println(
                "Enter Client ID and Secret from https://console.developers.google.com/project/_/apiui/credential "
                        + "into src/main/resources/client_secrets.json");
        return null;
    }
    FileDataStoreFactory fileDataStoreFactory = new FileDataStoreFactory(new File(System.getProperty("user.home") + "/" + CREDENTIALS_DIRECTORY));
    DataStore<StoredCredential> datastore = fileDataStoreFactory.getDataStore(credentialDatastore);

    GoogleAuthorizationCodeFlow flow = new GoogleAuthorizationCodeFlow.Builder(
            HTTP_TRANSPORT, JSON_FACTORY, clientSecrets, scopes).setCredentialDataStore(datastore)
            .build();
    LocalServerReceiver localReceiver = new LocalServerReceiver.Builder().setPort(8081).build();

    return new AuthorizationCodeInstalledApp(flow, localReceiver).authorize("user");
}

private static int counter = 0;
private static YouTube youtube;

public static void getYoutubeOauth() throws Exception {
    List<String> scopes = Lists.newArrayList("https://www.googleapis.com/auth/youtube.force-ssl");
    Credential credential = authorize(scopes, "commentthreads");
    youtube = new YouTube.Builder(Auth.HTTP_TRANSPORT, Auth.JSON_FACTORY, credential).build();

    String videoId = "KIgxmV9xXBQ";

    // Get video comments threads
    CommentThreadListResponse commentsPage = prepareListRequest(videoId).execute();

    while (true) {
        handleCommentsThreads(commentsPage.getItems());

        String nextPageToken = commentsPage.getNextPageToken();
        if (nextPageToken == null)
            break;

        commentsPage = prepareListRequest(videoId).setPageToken(nextPageToken).execute();
    }

    System.out.println("Total: " + counter);
}

private static YouTube.CommentThreads.List prepareListRequest(String videoId) throws Exception {

    return youtube.commentThreads()
                  .list("snippet,replies")
                  .setVideoId(videoId)
                  .setMaxResults(100L)
                  .setModerationStatus("published")
                  .setTextFormat("plainText");
}

private static void handleCommentsThreads(List<CommentThread> commentThreads) {

    for (CommentThread commentThread : commentThreads) {
        List<Comment> comments = Lists.newArrayList();
        comments.add(commentThread.getSnippet().getTopLevelComment());

        CommentThreadReplies replies = commentThread.getReplies();
        if (replies != null)
            comments.addAll(replies.getComments());

        System.out.println("Found " + comments.size() + " comments.");

        // Do your comments logic here
        counter += comments.size();
    }
}

注意：将FileInputStream位置更改为您自己的位置。

然后您可以致电getYoutubeOauth 并希望得到有效的回复:)