尝试使用 Java API 客户端查看 Google Drive 上的更改时出现”401 Unauthorized”

"401 Unauthorized" when trying to watch changes on Google Drive with Java API Client

真的卡在这里了。代码由 Google 提供的示例构建而成：

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public static void main(String[] args) {
try {
HttpTransport httpTransport = new NetHttpTransport();
JsonFactory jsonFactory = new JacksonFactory();

GoogleAuthorizationCodeFlow flow = new GoogleAuthorizationCodeFlow.Builder(
httpTransport, jsonFactory, CLIENT_ID, CLIENT_SECRET, Arrays.asList(DriveScopes.DRIVE))
.setAccessType("online")
.setApprovalPrompt("auto")
.build();

String url = flow.newAuthorizationUrl().setRedirectUri(REDIRECT_URI).build();
System.out.println("Please open the following URL in your browser then type the authorization code:");
System.out.println(" " + url);
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
String code = br.readLine();

GoogleTokenResponse response = flow.newTokenRequest(code).setRedirectUri(REDIRECT_URI).execute();
GoogleCredential credential = new GoogleCredential().setFromTokenResponse(response);

//Create a new authorized API client
Drive service = new Drive.Builder(httpTransport, jsonFactory, credential).setApplicationName("Google Push").build();

//Insert a file
File body = new File();
body.setTitle("My document");
body.setDescription("A test document");
body.setMimeType("text/plain");

java.io.File fileContent = new java.io.File("document.txt");
BufferedWriter bw = new BufferedWriter(new FileWriter(fileContent));
bw.write("allo!!!!");
bw.close();

System.out.println("file created? ->" + fileContent.createNewFile());
FileContent mediaContent = new FileContent("text/plain", fileContent);

File file = service.files().insert(body, mediaContent).execute();
System.out.println("File ID:" + file.getId());

watchChange(service,"channelId","web_hook","https://clementlevallois.net/notifications"); // line 78

} catch (IOException ex) {
Logger.getLogger(DriveCommandLine.class.getName()).log(Level.SEVERE, null, ex);
}

}

private static Channel watchChange(Drive service, String channelId, String channelType, String channelAddress) {

Channel channel = new Channel();
channel.setId(channelId);
channel.setType(channelType);
channel.setAddress(channelAddress);
try {
return service.changes().watch(channel).execute(); //line 91
} catch (IOException e) {
e.printStackTrace();
}
return null;
}

堆栈跟踪：

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com.google.api.client.googleapis.json.GoogleJsonResponseException: 401 Unauthorized
at com.google.api.client.googleapis.json.GoogleJsonResponseException.from(GoogleJsonResponseException.java:145)
at com.google.api.client.googleapis.services.json.AbstractGoogleJsonClientRequest.newExceptionOnError(AbstractGoogleJsonClientRequest.java:113)
at com.google.api.client.googleapis.services.json.AbstractGoogleJsonClientRequest.newExceptionOnError(AbstractGoogleJsonClientRequest.java:40)
at com.google.api.client.googleapis.services.AbstractGoogleClientRequest$1.interceptResponse(AbstractGoogleClientRequest.java:312)
at com.google.api.client.http.HttpRequest.execute(HttpRequest.java:1049)
at com.google.api.client.googleapis.services.AbstractGoogleClientRequest.executeUnparsed(AbstractGoogleClientRequest.java:410)
at com.google.api.client.googleapis.services.AbstractGoogleClientRequest.executeUnparsed(AbstractGoogleClientRequest.java:343)
at com.google.api.client.googleapis.services.AbstractGoogleClientRequest.execute(AbstractGoogleClientRequest.java:460)
at Controller.DriveCommandLine.watchChange(DriveCommandLine.java:91)
at Controller.DriveCommandLine.main(DriveCommandLine.java:78)