Java 如何使用Google Cloud API-用于文本检测的应用程序默认凭据

我使用了下面的java代码来检测图像的文本，但这里的问题是我无法正确地进行身份验证

 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());
            }
        }
    }
}

使用了以下LIB

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，该文件根据本文给出的指令下载

注意：-我已经在.bashrc文件中设置了GOOGLE\u APPLICATION\u CREDENTIALS变量

---

你能帮我解决这个问题吗

我在spring boot中使用了google cloud vision api。并且能够从图像中提取文本

用于在属性下面添加凭据

application.properties文件：

在pom.xml中添加了依赖项

<dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-gcp-starter-vision</artifactId>
        <version>1.2.3.RELEASE</version>
    </dependency>

org.springframework.cloud

注意：我没有使用GOOGLE\u APPLICATION\u CREDENTIALS变量。所以删除了library com.google.api.client.googleapis.auth.oauth2.GoogleCredential。
你读了整个消息了吗<代码>应用程序默认凭据不可用。如果在谷歌应用程序引擎、谷歌计算引擎或谷歌云外壳上运行，则可以使用它们。否则，必须定义指向定义凭据的文件的环境变量GOOGLE\u APPLICATION\u CREDENTIALS。看见https://developers.google.com/accounts/docs/application-default-credentials 更多信息。

您是否在GAE上运行？如果没有，您是否将环境变量设置为指向凭据？确实，您说您“使用了.json文件”-请提供有关如何使用它的详细信息。我已将.json文件放在资源目录中，并尝试此代码行以获取默认设置GoogleCredential credential=GoogleCredential.getApplicationDefault（）@JonSkeet@JimGarrisonGoogleCredential credential=GoogleCredential.getApplicationDefault（）；这就是我尝试过的方式it@BuddhikaAlwis：仅将JSON文件放入资源目录不会有任何作用。它需要在执行时是文件系统上的一个文件，然后需要设置GOOGLE\u APPLICATION\u CREDENTIALS环境变量来指定位置。此外，您在创建客户端时没有使用凭据。。。如果默认应用程序凭据正常工作，则根本不需要手动加载它们，但如果确实手动加载，则应在

ImageAnnotatorSettings

中指定它们。

@RequestMapping("/gettext")
 public String detectText() throws Exception, IOException {

        //GoogleCredential credential = GoogleCredential.getApplicationDefault();
    String finalText = "Ta Da! No value";
        List<AnnotateImageRequest> requests = new ArrayList<>();

        ByteString imgBytes = ByteString.readFrom(new FileInputStream("G:\\files\\type1.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()) {
                    finalText += annotation.getDescription();
                    System.out.println("Text: %s\n" + annotation.getDescription());
                    System.out.println("Position : %s\n" + annotation.getBoundingPoly());
                }
            }
        }
        return finalText;
    }

<dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-gcp-starter-vision</artifactId>
        <version>1.2.3.RELEASE</version>
    </dependency>

@RequestMapping("/gettext")
 public String detectText() throws Exception, IOException {

        //GoogleCredential credential = GoogleCredential.getApplicationDefault();
    String finalText = "Ta Da! No value";
        List<AnnotateImageRequest> requests = new ArrayList<>();

        ByteString imgBytes = ByteString.readFrom(new FileInputStream("G:\\files\\type1.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()) {
                    finalText += annotation.getDescription();
                    System.out.println("Text: %s\n" + annotation.getDescription());
                    System.out.println("Position : %s\n" + annotation.getBoundingPoly());
                }
            }
        }
        return finalText;
    }