找不到API包“ memcache”或调用“ Get（）”

Question

我正在研究可以在以下站点找到的Google Drive API示例： 使用服务帐户 ， 插入文件和设置权限 。 您可能会猜到，我才刚刚开始使用Google API。 因此，我确信答案已经存在，但是我对该主题的了解还不足以解释这些发现。

无论如何，我已使用Google的示例代码成功为我的服务帐户连接到云端硬盘。 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.

我上面引用的站点中的代码几乎是剪切粘贴的：

列出的第一行是导致错误的行。

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，我正在使用Maven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>

我确定我错过了一些东西，但是不确定那是什么。

谢谢。

Answer 1

好吧，我设法解决了这个问题，但答案并不完全令人满意。 根据有关服务帐户的Google SDK文档 ，有两种方法可以对其进行身份验证。

首先是创建一个证书（在上面的链接中详细介绍），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密钥。 第二种方法是我正在使用的方法。

该文档警告：

“注意：使用API​​密钥参数而不是使用Client ID和Client Secret方法对应用程序进行身份验证时，由于该方法的可信度较低，因此Google Drive API的所有特定于应用程序的功能都将被禁用。例如每个文件的Drive范围和“应用程序数据”文件夹无法使用。”

但是，我找不到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，为了解决该问题，我改用了带有证书文件的电子邮件地址，并且效果很好。

这是直接用于链接的代码：

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;
}

将此替换为我的setDriveService（），一切都很好。