Java GAE凭据在应用程序引擎上不可用

我正在

googleappengine

上运行一项服务，我想从

云存储桶中读取一些文件

正如我在这里读到的，您可以隐式或显式地获取凭据

我正在运行运行时
java8
上的服务

在我的服务中，我尝试过这两种方法，但都不起作用

隐式方式

StorageOptions.getDefaultInstance().getService();

GoogleCredentials credentials = AppEngineCredentials.getApplicationDefault();
storage = StorageOptions.newBuilder().setCredentials(credentials).build().getService();

当我应用隐式方法时，我总是得到这个错误

com.google.cloud.storage.StorageException: Anonymous caller does not have storage.buckets.get access to xxxxxxxxxx.
at com.google.cloud.storage.spi.v1.HttpStorageRpc.translate(HttpStorageRpc.java:229)
at com.google.cloud.storage.spi.v1.HttpStorageRpc.get(HttpStorageRpc.java:406)
at com.google.cloud.storage.StorageImpl$4.call(StorageImpl.java:215)
at com.google.cloud.storage.StorageImpl$4.call(StorageImpl.java:212)
at com.google.api.gax.retrying.DirectRetryingExecutor.submit(DirectRetryingExecutor.java:105)
at com.google.cloud.RetryHelper.run(RetryHelper.java:76)

The Application Default Credentials are not available. They are available if running in Google Compute Engine. Otherwise, the environment variable GOOGLE_APPLICATION_CREDENTIALS must be defined pointing to a file defining the credentials. See https://developers.google.com/accounts/docs/application-default-credentials for more information.

明确的方式

StorageOptions.getDefaultInstance().getService();

GoogleCredentials credentials = AppEngineCredentials.getApplicationDefault();
storage = StorageOptions.newBuilder().setCredentials(credentials).build().getService();

通过应用AppEngine的显式方法，我得到了这个错误

com.google.cloud.storage.StorageException: Anonymous caller does not have storage.buckets.get access to xxxxxxxxxx.
at com.google.cloud.storage.spi.v1.HttpStorageRpc.translate(HttpStorageRpc.java:229)
at com.google.cloud.storage.spi.v1.HttpStorageRpc.get(HttpStorageRpc.java:406)
at com.google.cloud.storage.StorageImpl$4.call(StorageImpl.java:215)
at com.google.cloud.storage.StorageImpl$4.call(StorageImpl.java:212)
at com.google.api.gax.retrying.DirectRetryingExecutor.submit(DirectRetryingExecutor.java:105)
at com.google.cloud.RetryHelper.run(RetryHelper.java:76)

The Application Default Credentials are not available. They are available if running in Google Compute Engine. Otherwise, the environment variable GOOGLE_APPLICATION_CREDENTIALS must be defined pointing to a file defining the credentials. See https://developers.google.com/accounts/docs/application-default-credentials for more information.

我正在使用依赖项

    <dependency>
        <groupId>com.google.cloud</groupId>
        <artifactId>google-cloud-storage</artifactId>
        <version>1.92.0</version>
    </dependency>


com.google.cloud
谷歌云存储
1.92.0

在本地环境下运行是可行的

提前感谢
在运行时java8上唯一适合我的代码是

import com.google.appengine.api.appidentity.AppIdentityService;
import com.google.appengine.api.appidentity.AppIdentityServiceFactory;
import com.google.auth.appengine.AppEngineCredentials;
import com.google.auth.oauth2.GoogleCredentials;
import com.google.cloud.storage.*;

AppIdentityService appIdentityService = AppIdentityServiceFactory.getAppIdentityService();
GoogleCredentials credentials = AppEngineCredentials.newBuilder().setAppIdentityService(appIdentityService).build();
storage = StorageOptions.newBuilder().setCredentials(credentials).build().getService();

嘿，阿尔索！如果这个答案适合你，你能接受它吗？这样它就更具可视性，其他用户也会从中受益？