问无法验证google recaptcha企业。获取错误: java.io.IOException:应用程序默认凭据不可用

EN

java.io.IOException: The Application Default Credentials are not available.

java.io.IOException: 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. 

  // If you don't specify credentials when constructing the client, the client library will
  // look for credentials via the environment variable GOOGLE_APPLICATION_CREDENTIALS.
  Storage storage = StorageOptions.getDefaultInstance().getService();

  System.out.println("Buckets:");
  Page<Bucket> buckets = storage.list();
for (Bucket bucket : buckets.iterateAll()) {
    System.out.println(bucket.toString());
  }

System.setProperty("GOOGLE_APPLICATION_CREDENTIALS", jsonPath);
System.out.println("GOOGLE_APPLICATION_CREDENTIALS");
System.out.println(System.getProperty("GOOGLE_APPLICATION_CREDENTIALS"));
FileInputStream fileInputStream = new FileInputStream(jsonPath);
  GoogleCredentials credentials = GoogleCredentials.fromStream(fileInputStream)
        .createScoped(Lists.newArrayList("https://www.googleapis.com/auth/cloud-platform"));
  Storage storage = StorageOptions.newBuilder().setCredentials(credentials).build().getService();

  System.out.println("Buckets:");
  Page<Bucket> buckets = storage.list();
  for (Bucket bucket : buckets.iterateAll()) {
    System.out.println(bucket.toString());
  }

/**
      * Create an assessment to analyze the risk of an UI action.
      *
      * @param projectID: GCloud Project ID
      * @param recaptchaSiteKey: Site key obtained by registering a domain/app to use recaptcha services.
      * @param token: The token obtained from the client on passing the recaptchaSiteKey.
      * @param recaptchaAction: Action name corresponding to the token.
      */
     public static void createAssessment(String projectID, String recaptchaSiteKey, String token,
         String recaptchaAction)
         throws IOException {
       // Initialize a client that will be used to send requests. This client needs to be created only
       // once, and can be reused for multiple requests. After completing all of your requests, call
       // the `client.close()` method on the client to safely
       // clean up any remaining background resources.
       try (RecaptchaEnterpriseServiceClient client = RecaptchaEnterpriseServiceClient.create()) {

         // Specify a name for this assessment.
         String assessmentName = "assessment-name";

         // Set the properties of the event to be tracked.
         Event event = Event.newBuilder()
             .setSiteKey(recaptchaSiteKey)
             .setToken(token)
             .build();

         // Build the assessment request.
         CreateAssessmentRequest createAssessmentRequest = CreateAssessmentRequest.newBuilder()
             .setParent(ProjectName.of(projectID).toString())
             .setAssessment(Assessment.newBuilder().setEvent(event).setName(assessmentName).build())
             .build();

         Assessment response = client.createAssessment(createAssessmentRequest);

         // Check if the token is valid.
         if (!response.getTokenProperties().getValid()) {
           System.out.println("The CreateAssessment call failed because the token was: " +
              response.getTokenProperties().getInvalidReason().name());
           return;
         }

         // Check if the expected action was executed.
         if (!response.getTokenProperties().getAction().equals(recaptchaAction)) {
           System.out.println("The action attribute in your reCAPTCHA tag " +
               "does not match the action you are expecting to score");
           return;
         }

         // Get the risk score and the reason(s).
         // For more information on interpreting the assessment,
         // see: https://cloud.google.com/recaptcha-enterprise/docs/interpret-assessment
         float recaptchaScore = response.getRiskAnalysis().getScore();
         System.out.println("The reCAPTCHA score is: " + recaptchaScore);

         for (ClassificationReason reason : response.getRiskAnalysis().getReasonsList()) {
           System.out.println(reason);
         }
       }