java - 未找到 API 包 'memcache' 或调用 'Get()'

Question

我正在研究 Google Drive API 示例，这些示例可以在以下站点找到:Using Service Accounts , Inserting a File ，和 Setting Permissions 。正如您可能猜到的，我刚刚开始使用 Google API。因此，我确信答案就在那里，但我对这个主题的了解还不够广泛，无法解释这些发现。

无论如何，使用 Google 的示例代码，我已成功连接到我的服务帐户的云端硬盘。但是，我无法插入文件。我收到以下错误:

com.google.apphosting.api.ApiProxy$CallNotFoundException: The API package 'memcache' or call 'Get()' was not found.
    at com.google.apphosting.api.ApiProxy$1.get(ApiProxy.java:162)
    at com.google.apphosting.api.ApiProxy$1.get(ApiProxy.java:160)
    at com.google.appengine.api.utils.FutureWrapper.get(FutureWrapper.java:86)
    at com.google.appengine.api.memcache.MemcacheServiceImpl.quietGet(MemcacheServiceImpl.java:26)
    at com.google.appengine.api.memcache.MemcacheServiceImpl.get(MemcacheServiceImpl.java:49)
    at com.google.appengine.api.appidentity.AppIdentityServiceImpl.getAccessToken(AppIdentityServiceImpl.java:188)
    at com.google.api.client.googleapis.extensions.appengine.auth.oauth2.AppIdentityCredential.intercept(AppIdentityCredential.java:93)
    at com.google.api.client.http.HttpRequest.execute(HttpRequest.java:859)
    at com.google.api.client.googleapis.media.MediaHttpUploader.executeCurrentRequestWithoutGZip(MediaHttpUploader.java:545)
    at com.google.api.client.googleapis.media.MediaHttpUploader.executeCurrentRequest(MediaHttpUploader.java:562)
    at com.google.api.client.googleapis.media.MediaHttpUploader.executeUploadInitiation(MediaHttpUploader.java:519)
    at com.google.api.client.googleapis.media.MediaHttpUploader.resumableUpload(MediaHttpUploader.java:384)
    at com.google.api.client.googleapis.media.MediaHttpUploader.upload(MediaHttpUploader.java:336)
    at com.google.api.client.googleapis.services.AbstractGoogleClientRequest.executeUnparsed(AbstractGoogleClientRequest.java:418)
    at com.google.api.client.googleapis.services.AbstractGoogleClientRequest.executeUnparsed(AbstractGoogleClientRequest.java:343)
    at com.google.api.client.googleapis.services.AbstractGoogleClientRequest.execute(AbstractGoogleClientRequest.java:460)
    at DriveTest.GDrive.insertFile(GDrive.java:80)
    at DriveTest.GDrive.putFile(GDrive.java:58)
    at DriveTest.App.main(App.java:28)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at com.intellij.rt.execution.application.AppMain.main(AppMain.java:120)
The API package 'memcache' or call 'Get()' was not found.

Code is pretty much cut-and-paste from the sites I referenced above:

The first line listed is the line that causes the error.

File file = service.files().insert(body, mediaContent).execute();

package DriveTest;
import com.google.api.client.googleapis.extensions.appengine.auth.oauth2.AppIdentityCredential;
import com.google.api.client.googleapis.services.CommonGoogleClientRequestInitializer;
import com.google.api.client.googleapis.services.GoogleClientRequestInitializer;
import com.google.api.client.http.FileContent;
import com.google.api.client.http.HttpTransport;
import com.google.api.client.http.javanet.NetHttpTransport;
import com.google.api.client.json.JsonFactory;
import com.google.api.client.json.jackson.JacksonFactory;
import com.google.api.services.drive.Drive;
import com.google.api.services.drive.DriveScopes;
import com.google.api.services.drive.model.File;
import com.google.api.services.drive.model.ParentReference;
import com.google.api.services.drive.model.Permission;

import java.io.IOException;
import java.net.URISyntaxException;
import java.security.GeneralSecurityException;
import java.util.ArrayList;
import java.util.Arrays;



    public class GDrive {

        private static GDrive instance=null;
        private static Drive drive=null;
        private static final String API_KEY = "ourkey";

        protected GDrive() {}

        public static GDrive getInstance() {
            if(instance==null) {
                instance=new GDrive();

            }
            return instance;
        }

        public void setDriveService() throws GeneralSecurityException,IOException, URISyntaxException {
            if(drive==null) {
                HttpTransport httpTransport = new NetHttpTransport();
                JsonFactory jsonFactory = new JacksonFactory();
                ArrayList<String> scopes=new ArrayList<String>();
                scopes.add(DriveScopes.DRIVE);
                AppIdentityCredential credential = new AppIdentityCredential.Builder(scopes).build();
                GoogleClientRequestInitializer keyInitializer = new CommonGoogleClientRequestInitializer(API_KEY);
                drive = new Drive.Builder(httpTransport, jsonFactory, null)
                        .setHttpRequestInitializer(credential)
                        .setGoogleClientRequestInitializer(keyInitializer)
                        .build();
            }
        }

        public void putFile(String filename) throws Exception {
            File theFile=this.insertFile(this.drive, "Report", "a report!","","application/vnd.ms-excel",filename);
            Permission thePermission=this.setShare(this.drive, theFile.getId(),"someuser@somedomain.com","user","reader");
        }

        private File insertFile(Drive service, String title, String description,
                                       String parentId, String mimeType, String filename) {
            // File's metadata.
            File body = new File();
            body.setTitle(title);
            body.setDescription(description);
            body.setMimeType(mimeType);

            // Set the parent folder.
            if (parentId != null && parentId.length() > 0) {
                body.setParents(
                        Arrays.asList(new ParentReference().setId(parentId)));
            }

            // File's content.
            java.io.File fileContent = new java.io.File(filename);
            FileContent mediaContent = new FileContent(mimeType, fileContent);
            try {
                File file = service.files().insert(body, mediaContent).execute();

                // Uncomment the following line to print the File ID.
                System.out.println("File ID: %s" + file.getId());

                return file;
            } catch (IOException e) {
                System.out.println("An error occured: " + e);
                return null;
            }
        }

        /**
         * Insert a new permission.
         *
         * @param service Drive API service instance.
         * @param fileId ID of the file to insert permission for.
         * @param value User or group e-mail address, domain name or {@code null}
        "default" type.
         * @param type The value "user", "group", "domain" or "default".
         * @param role The value "owner", "writer" or "reader".
         * @return The inserted permission if successful, {@code null} otherwise.
         */
        private Permission setShare(Drive service, String fileId,
                                    String value, String type, String role) throws Exception {

            Permission newPermission = new Permission();

            newPermission.setValue(value);
            newPermission.setType(type);
            newPermission.setRole(role);
            try {
                return service.permissions().insert(fileId, newPermission).execute();
            } catch (IOException e) {
                System.out.println("An error occurred: " + e);
            }
            return newPermission;
        }

    }

最后，我使用 Maven 来处理依赖关系:

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>

  <groupId>DriveTest</groupId>
  <artifactId>DriveTest</artifactId>
  <version>1.0-SNAPSHOT</version>
  <packaging>jar</packaging>

  <name>DriveTest</name>
  <url>http://maven.apache.org</url>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
  </properties>

  <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>3.8.1</version>
      <scope>test</scope>
    </dependency>
      <dependency>
          <groupId>com.google.api-client</groupId>
          <artifactId>google-api-client</artifactId>
          <version>1.17.0-rc</version>
      </dependency>
      <dependency>
          <groupId>com.google.api-client</groupId>
          <artifactId>google-api-client-appengine</artifactId>
          <version>1.17.0-rc</version>
      </dependency>
      <dependency>
          <groupId>com.google.apis</groupId>
          <artifactId>google-api-services-drive</artifactId>
          <version>v2-rev105-1.17.0-rc</version>
      </dependency>
      <dependency>
          <groupId>com.google.http-client</groupId>
          <artifactId>google-http-client-jackson</artifactId>
          <version>1.17.0-rc</version>
      </dependency>
      <dependency>
          <groupId>com.google.appengine</groupId>
          <artifactId>appengine-api-1.0-sdk</artifactId>
          <version>1.8.1</version>
      </dependency>
  </dependencies>
</project>

我确信我错过了一些东西，但不确定那是什么。

谢谢。

Answer 1

嗯，我成功了，但答案并不完全令人满意。根据The Google SDK Documentation for Service Accounts ，有两种方法可以对其进行身份验证。

第一个是创建一个证书(上面的链接中有详细说明)，并使用该证书和服务电子邮件帐户地址。第二种是使用电子邮件帐户和 api key 。第二种方法是我使用的方法。

文档警告:

"Note: When authenticating your application using an API Key parameter - instead of using the Client ID and Client Secret method - all application-specific features of the Google Drive API will be disabled as this method is less trusted. For instance the Drive per file scope and the Application Data folder cannot be used."

但是，我找不到任何有用的信息来详细说明为什么我收到提示此问题的错误。

因此，为了解决这个问题，我改用电子邮件地址和证书文件，效果很好。

这是代码，直接用于链接:

import com.google.api.client.googleapis.extensions.appengine.auth.oauth2.AppIdentityCredential;
import com.google.api.client.googleapis.services.CommonGoogleClientRequestInitializer;
import com.google.api.client.googleapis.services.GoogleClientRequestInitializer;
import com.google.api.client.http.HttpTransport;
import com.google.api.client.http.javanet.NetHttpTransport;
import com.google.api.client.json.JsonFactory;
import com.google.api.client.json.jackson.JacksonFactory;
import com.google.api.services.drive.Drive;
import com.google.api.services.drive.DriveScopes;
...

/** The API Key of the project */
private static final String API_KEY = "the_api_key_of_the_project";

/**
 * Build and returns a Drive service object authorized with the
 * application's service accounts.
 *
 * @return Drive service object that is ready to make requests.
 */
public static Drive getDriveService() throws GeneralSecurityException,
    IOException, URISyntaxException {
  HttpTransport httpTransport = new NetHttpTransport();
  JsonFactory jsonFactory = new JacksonFactory();
  AppIdentityCredential credential =
      new AppIdentityCredential.Builder(DriveScopes.DRIVE).build();
  GoogleClientRequestInitializer keyInitializer =
      new CommonGoogleClientRequestInitializer(API_KEY);
  Drive service = new Drive.Builder(httpTransport, jsonFactory, null)
      .setHttpRequestInitializer(credential)
      .setGoogleClientRequestInitializer(keyInitializer)
      .build();
  return service;
}

将其替换为我的 setDriveService() ，一切都很好。