我可以用這個憑證 gmail api oauth2 錯誤做什么？

Question

我正在嘗試使用 oauth2 訪問我的電子郵件並與帳戶和桌面 api 進行交互-接收和發送電子郵件-我在 java 中使用了帶有 gradle 的示例https://developers.google.com/gmail/api/quickstart/ java ，我得到這個錯誤：

線程“主”java.io.FileNotFoundException 中的異常：找不到資源：C:/Users/xxx/Documents/tableaux dir/prjet 電子郵件 gmail/src/main/ressources/credential.json 在 GmailQuickstart.getCredentials(GmailQuickstart.java: 50) 在 GmailQuickstart.main(GmailQuickstart.java:69)

請問我能做什么？

編碼

    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.http.javanet.NetHttpTransport;
import com.google.api.client.json.JsonFactory;
import com.google.api.client.json.gson.GsonFactory;
import com.google.api.client.util.store.FileDataStoreFactory;
import com.google.api.services.gmail.Gmail;
import com.google.api.services.gmail.GmailScopes;
import com.google.api.services.gmail.model.Label;
import com.google.api.services.gmail.model.ListLabelsResponse;

import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.security.GeneralSecurityException;
import java.util.Collections;
import java.util.List;

/* class to demonstrate use of Gmail list labels API */
public class GmailQuickstart {
    /** Application name. */
    private static final String APPLICATION_NAME = "Gmail API Java Quickstart";
    /** Global instance of the JSON factory. */
    private static final JsonFactory JSON_FACTORY = GsonFactory.getDefaultInstance();
    /** Directory to store authorization tokens for this application. */
    private static final String TOKENS_DIRECTORY_PATH = "tokens";

    /**
     * Global instance of the scopes required by this quickstart.
     * If modifying these scopes, delete your previously saved tokens/ folder.
     */
    private static final List<String> SCOPES = Collections.singletonList(GmailScopes.GMAIL_LABELS);
    private static final String CREDENTIALS_FILE_PATH = "C:/Users/xxx/Documents/tableaux dir/prjet email gmail/src/main/ressources/credential.json";

    /**
     * Creates an authorized Credential object.
     * @param HTTP_TRANSPORT The network HTTP Transport.
     * @return An authorized Credential object.
     * @throws IOException If the credentials.json file cannot be found.
     */
    private static Credential getCredentials(final NetHttpTransport HTTP_TRANSPORT) throws IOException {
        // Load client secrets.
        InputStream in = GmailQuickstart.class.getResourceAsStream(CREDENTIALS_FILE_PATH);
        if (in == null) {
            throw new FileNotFoundException("Resource not found: " + CREDENTIALS_FILE_PATH);
        }
        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(new FileDataStoreFactory(new java.io.File(TOKENS_DIRECTORY_PATH)))
                .setAccessType("offline")
                .build();
        LocalServerReceiver receiver = new LocalServerReceiver.Builder().setPort(8888).build();
        Credential credential = new AuthorizationCodeInstalledApp(flow, receiver).authorize("user");
        //returns an authorized Credential object.
        return credential;
    }

    public static void main(String... args) throws IOException, GeneralSecurityException {
        // Build a new authorized API client service.
        final NetHttpTransport HTTP_TRANSPORT = GoogleNetHttpTransport.newTrustedTransport();
        Gmail service = new Gmail.Builder(HTTP_TRANSPORT, JSON_FACTORY, getCredentials(HTTP_TRANSPORT))
                .setApplicationName(APPLICATION_NAME)
                .build();

        // Print the labels in the user's account.
        String user = "me";
        ListLabelsResponse listResponse = service.users().labels().list(user).execute();
        List<Label> labels = listResponse.getLabels();
        if (labels.isEmpty()) {
            System.out.println("No labels found.");
        } else {
            System.out.println("Labels:");
            for (Label label : labels) {
                System.out.printf("- %s\n", label.getName());
            }
        }
    }
}

Answer 1

轉到谷歌雲控制台並創建一個 cedetials.json 文件，確保為已安裝/桌面或本機應用程序創建它。

• 創建已安裝的憑據

它會提示您下載一個 json 文件。 將此文件放在由 CREDENTIALS_FILE_PATH 表示的目錄中。

在您的情況下，文件應該使用此名稱在此處，這實際上不是路徑，而是文件的全名。 因此，請確保您沒有為它使用不同的名稱或最后沒有額外的 .json。

"C:/Users/xxx/Documents/tableaux dir/prjet email gmail/src/main/ressources/credential.json"

Answer 2

您缺少憑據文件。 在您提供的鏈接中，它說這是一個先決條件。 創建它並填寫值或從該鏈接下載並將其粘貼到位置C:/Users/xxx/Documents/tableaux dir/prjet email gmail/src/main/ressources然后將值更改為您的設置。

此頁面可以幫助創建您的憑據https://developers.google.com/workspace/guides/create-credentials

Answer 3

正如這里所說， getResourceAsStream() 返回 null。 屬性文件未加載“GmailQuickstart.class.getResourceAsStream(CREDENTIALS_FILE_PATH)”函數使用類路徑，因此需要相對路徑。 所以 String CREDENTIALS_FILE_PATH = "credentials.json" 就足夠了。