如何使用Google Cloud API-用于文本检测的应用程序默认凭据

Question

我已使用以下Java代码检测图像的文本，但是这里的问题是我无法正确进行身份验证

 public static void detectText() throws Exception, IOException {

    GoogleCredential credential = GoogleCredential.getApplicationDefault();

    List<AnnotateImageRequest> requests = new ArrayList<>();

    ByteString imgBytes = ByteString.readFrom(new FileInputStream("/home/buddika/Desktop/car_number_pate_16.jpeg"));

    Image img = Image.newBuilder().setContent(imgBytes).build();
    Feature feat = Feature.newBuilder().setType(Type.TEXT_DETECTION).build();
    AnnotateImageRequest request =
            AnnotateImageRequest.newBuilder()
                    .addFeatures(feat).setImage(img).build();
    requests.add(request);

    try (ImageAnnotatorClient client = ImageAnnotatorClient.create()) {
        BatchAnnotateImagesResponse response = client.batchAnnotateImages(requests);
        List<AnnotateImageResponse> responses = response.getResponsesList();

        for (AnnotateImageResponse res : responses) {
            if (res.hasError()) {
                System.out.println("Error: %s\n"+ res.getError().getMessage());
                return;
            }

            // For full list of available annotations, see http://g.co/cloud/vision/docs
            for (EntityAnnotation annotation : res.getTextAnnotationsList()) {
                System.out.println("Text: %s\n" + annotation.getDescription());
                System.out.println("Position : %s\n" + annotation.getBoundingPoly());
            }
        }
    }
}

一旦执行此代码行，我将收到以下错误消息

Exception in thread "main" java.io.IOException: The Application Default Credentials are not available. They are available if running on Google App Engine, Google Compute Engine, or Google Cloud Shell. 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.
    at com.google.api.client.googleapis.auth.oauth2.DefaultCredentialProvider.getDefaultCredential(DefaultCredentialProvider.java:98)
    at com.google.api.client.googleapis.auth.oauth2.GoogleCredential.getApplicationDefault(GoogleCredential.java:213)
    at com.google.api.client.googleapis.auth.oauth2.GoogleCredential.getApplicationDefault(GoogleCredential.java:191)
    at com.security.management.system.api.google_cloud_api.TextDetect.detectText(TextDetect.java:157)
    at com.security.management.system.api.google_cloud_api.TextDetect.main(TextDetect.java:48)

以下库被使用

import com.google.api.client.googleapis.auth.oauth2.GoogleCredential;
import com.google.cloud.vision.spi.v1.ImageAnnotatorClient;
import com.google.cloud.vision.v1.*;
import com.google.cloud.vision.v1.Feature.Type;
import com.google.protobuf.ByteString;

import java.io.FileInputStream;
import java.io.IOException;
import java.io.PrintStream;
import java.util.ArrayList;
import java.util.List;

注意，我也使用了.json文件，该文件也是根据此link给出的说明下载的。>

注意：-我已经在.bashrc文件中设置了GOOGLE_APPLICATION_CREDENTIALS变量

请您帮我解决这个问题

我已经使用以下Java代码检测图像的文本，但是这里的问题是我无法正确地验证公共静态void detectText（）引发Exception，IOException {...

Answer 1

我在春季启动中使用了Google Cloud Vision API。并能够从图像中提取文本。