Manipulating files and folders on Google Drive using Java

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1- Objective of lesson

See Also:
In this lesson, I am going to guide you for manipulating with  Google Drive via  Google Drive Java API. Topics to be discussed in this lesson include:
  1. Create a Java application and declare libraries to use the Google Drive API.
  2. Create a Credentials to be able to  interact with the Google Drive.
  3. Manipulate with the files and folders on the Google Drive via the Google Drive API.

2- Create Credentials

Suppose that you have a  Gmail account:  [email protected], then the  Google will provide you with 15GB of hard drive space free of charge on Google Drive. You can store your files on it. For your application to be able to manipulate with the files on Google Drive, it needs a credentials. The credentials is simply a file which will be placed on the computer where your application is being deployed like the following illustration:
To obtain one foresaid  Credentials, you need to create a Project on the  Google Developer Console, and download it to the  client_secret.json ​​​​​​​file.

3- Java Google Drive API

For the projects using  Maven, you need to declare the following dependencies:
<!-- https://mvnrepository.com/artifact/com.google.apis/google-api-services-drive -->
<dependency>
    <groupId>com.google.apis</groupId>
    <artifactId>google-api-services-drive</artifactId>
    <version>v3-rev105-1.23.0</version>
</dependency>


<!-- https://mvnrepository.com/artifact/com.google.api-client/google-api-client -->
<dependency>
    <groupId>com.google.api-client</groupId>
    <artifactId>google-api-client</artifactId>
    <version>1.23.0</version>
</dependency>

<!-- https://mvnrepository.com/artifact/com.google.oauth-client/google-oauth-client-jetty -->
<dependency>
    <groupId>com.google.oauth-client</groupId>
    <artifactId>google-oauth-client-jetty</artifactId>
    <version>1.23.0</version>
</dependency>

4- Get started quickly with an example

Create a  Maven project and  DriveQuickstart class to get started quickly with the  Google Drive API.
DriveQuickstart.java
package org.o7planning.googledrive.quickstart;

import com.google.api.client.auth.oauth2.Credential;
import com.google.api.client.extensions.java6.auth.oauth2.AuthorizationCodeInstalledApp;
import com.google.api.client.extensions.jetty.auth.oauth2.LocalServerReceiver;
import com.google.api.client.googleapis.auth.oauth2.GoogleAuthorizationCodeFlow;
import com.google.api.client.googleapis.auth.oauth2.GoogleClientSecrets;
import com.google.api.client.googleapis.javanet.GoogleNetHttpTransport;
import com.google.api.client.http.javanet.NetHttpTransport;
import com.google.api.client.json.JsonFactory;
import com.google.api.client.json.jackson2.JacksonFactory;
import com.google.api.client.util.store.FileDataStoreFactory;
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.FileList;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.security.GeneralSecurityException;
import java.util.Collections;
import java.util.List;

public class DriveQuickstart {

    private static final String APPLICATION_NAME = "Google Drive API Java Quickstart";

    private static final JsonFactory JSON_FACTORY = JacksonFactory.getDefaultInstance();

    // Directory to store user credentials for this application.
    private static final java.io.File CREDENTIALS_FOLDER //
            = new java.io.File(System.getProperty("user.home"), "credentials");

    private static final String CLIENT_SECRET_FILE_NAME = "client_secret.json";

    //
    // Global instance of the scopes required by this quickstart. If modifying these
    // scopes, delete your previously saved credentials/ folder.
    //
    private static final List<String> SCOPES = Collections.singletonList(DriveScopes.DRIVE);

    private static Credential getCredentials(final NetHttpTransport HTTP_TRANSPORT) throws IOException {

        java.io.File clientSecretFilePath = new java.io.File(CREDENTIALS_FOLDER, CLIENT_SECRET_FILE_NAME);

        if (!clientSecretFilePath.exists()) {
            throw new FileNotFoundException("Please copy " + CLIENT_SECRET_FILE_NAME //
                    + " to folder: " + CREDENTIALS_FOLDER.getAbsolutePath());
        }

        // Load client secrets.
        InputStream in = new FileInputStream(clientSecretFilePath);

        GoogleClientSecrets clientSecrets = GoogleClientSecrets.load(JSON_FACTORY, new InputStreamReader(in));

        // Build flow and trigger user authorization request.
        GoogleAuthorizationCodeFlow flow = new GoogleAuthorizationCodeFlow.Builder(HTTP_TRANSPORT, JSON_FACTORY,
                clientSecrets, SCOPES).setDataStoreFactory(new FileDataStoreFactory(CREDENTIALS_FOLDER))
                        .setAccessType("offline").build();

        return new AuthorizationCodeInstalledApp(flow, new LocalServerReceiver()).authorize("user");
    }

    public static void main(String... args) throws IOException, GeneralSecurityException {

        System.out.println("CREDENTIALS_FOLDER: " + CREDENTIALS_FOLDER.getAbsolutePath());

        // 1: Create CREDENTIALS_FOLDER
        if (!CREDENTIALS_FOLDER.exists()) {
            CREDENTIALS_FOLDER.mkdirs();

            System.out.println("Created Folder: " + CREDENTIALS_FOLDER.getAbsolutePath());
            System.out.println("Copy file " + CLIENT_SECRET_FILE_NAME + " into folder above.. and rerun this class!!");
            return;
        }

        // 2: Build a new authorized API client service.
        final NetHttpTransport HTTP_TRANSPORT = GoogleNetHttpTransport.newTrustedTransport();

        // 3: Read client_secret.json file & create Credential object.
        Credential credential = getCredentials(HTTP_TRANSPORT);

        // 5: Create Google Drive Service.
        Drive service = new Drive.Builder(HTTP_TRANSPORT, JSON_FACTORY, credential) //
                .setApplicationName(APPLICATION_NAME).build();

        // Print the names and IDs for up to 10 files.
        FileList result = service.files().list().setPageSize(10).setFields("nextPageToken, files(id, name)").execute();
        List<File> files = result.getFiles();
        if (files == null || files.isEmpty()) {
            System.out.println("No files found.");
        } else {
            System.out.println("Files:");
            for (File file : files) {
                System.out.printf("%s (%s)\n", file.getName(), file.getId());
            }
        }
    }
}
For the first time, run the  DriveQuickstart class, a {user_home}/credentials folder will be created if it doesn't exist.
Windows C:\Users\{user}\credentials
Linux /home/{user}/credentials
Ensure that you have obtained the  client_secret.json file. If not, let's see the following instructions:
Copy the  client_secret.json file to the above folder:
Run the  DriveQuickstart class once again. On the  Console window, copy the Link and access it on the browser.
When you access the link on the browser, it will ask you to log in with a Gmail account. At this moment, you need to log in with the Gmail account with which you have created the client_secret.json ​​​​​​​file.
At this moment, a file named  StoredCredential will be created on the  {user_home}/credential folder.
The Credential has been stored on your computer hard drive. From now, when working with  Google Drive, you don't have to go through the above steps:
Run the  DriveQuickstart class once again and view the results on the  Console window. The program will print out a list of files and folders on your Google Drive.

5- File and Directory Structure of Google Drive

Concept of Directory and File in  Google Drive is a little different from the  Directory & File concept in operating systems. Following are basic characteristics:
  1. In Google Drive, one File/Directory can have one or more parent Directories.
  2. In the same directory, the files can have the same name but different ID.
  3. The com.google.api.services.drive.model.File class represents for both, File and Directory.
The  com.google.api.services.drive.model.File class has a lot of fields as in the following illustration:
There are 2 important fields such as  mineType & parents:

parents

The ID list of parent directories of present file (directory).  Root directories or root file have parent directory with ID = "root".

mineType

MIME Type Description
application/vnd.google-apps.audio  
application/vnd.google-apps.document Google Docs
application/vnd.google-apps.drawing Google Drawing
application/vnd.google-apps.file Google Drive file
application/vnd.google-apps.folder Google Drive folder
application/vnd.google-apps.form Google Forms
application/vnd.google-apps.fusiontable Google Fusion Tables
application/vnd.google-apps.map Google My Maps
application/vnd.google-apps.photo  
application/vnd.google-apps.presentation Google Slides
application/vnd.google-apps.script Google Apps Scripts
application/vnd.google-apps.site Google Sites
application/vnd.google-apps.spreadsheet Google Sheets
application/vnd.google-apps.unknown  
application/vnd.google-apps.video  
application/vnd.google-apps.drive-sdk 3rd party shortcut
.....  
Operators used for fields:
Field Value Type Operators Description
name string contains, =, != Name of the file.
fullText string contains Full text of the file including name, description, content, and indexable text.
mimeType string contains, =, != MIME type of the file.
modifiedTime date <=, <, =, !=, >, >= Date of the last modification of the file.
viewedByMeTime date <=, <, =, !=, >, >= Date that the user last viewed a file.
trashed boolean =, != Whether the file is in the trash or not.
starred boolean =, != Whether the file is starred or not.
parents collection in Whether the parents collection contains the specified ID.
owners collection in Users who own the file.
writers collection in Users or groups who have permission to modify the file.
readers collection in Users or groups who have permission to read the file.
sharedWithMe boolean =, != Files that are in the user's "Shared with me" collection.
properties collection has Public custom file properties.
       
appProperties collection has Private custom file properties.
       
visibility string =, '!=' The visibility level of the file. Valid values are anyoneCanFind, anyoneWithLink, domainCanFind, domainWithLink, and limited.

6- GoogleDriveUtils Class

GoogleDriveUtils.java
package org.o7planning.googledrive.utils;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.Collections;
import java.util.List;

import com.google.api.client.auth.oauth2.Credential;
import com.google.api.client.extensions.java6.auth.oauth2.AuthorizationCodeInstalledApp;
import com.google.api.client.extensions.jetty.auth.oauth2.LocalServerReceiver;
import com.google.api.client.googleapis.auth.oauth2.GoogleAuthorizationCodeFlow;
import com.google.api.client.googleapis.auth.oauth2.GoogleClientSecrets;
import com.google.api.client.googleapis.javanet.GoogleNetHttpTransport;
import com.google.api.client.http.HttpTransport;
import com.google.api.client.json.JsonFactory;
import com.google.api.client.json.jackson2.JacksonFactory;
import com.google.api.client.util.store.FileDataStoreFactory;
import com.google.api.services.drive.Drive;
import com.google.api.services.drive.DriveScopes;

public class GoogleDriveUtils {

    private static final String APPLICATION_NAME = "Google Drive API Java Quickstart";

    private static final JsonFactory JSON_FACTORY = JacksonFactory.getDefaultInstance();

    // Directory to store user credentials for this application.
    private static final java.io.File CREDENTIALS_FOLDER //
            = new java.io.File(System.getProperty("user.home"), "credentials");

    private static final String CLIENT_SECRET_FILE_NAME = "client_secret.json";

    private static final List<String> SCOPES = Collections.singletonList(DriveScopes.DRIVE);

    // Global instance of the {@link FileDataStoreFactory}.
    private static FileDataStoreFactory DATA_STORE_FACTORY;

    // Global instance of the HTTP transport.
    private static HttpTransport HTTP_TRANSPORT;

    private static Drive _driveService;

    static {
        try {
            HTTP_TRANSPORT = GoogleNetHttpTransport.newTrustedTransport();
            DATA_STORE_FACTORY = new FileDataStoreFactory(CREDENTIALS_FOLDER);
        } catch (Throwable t) {
            t.printStackTrace();
            System.exit(1);
        }
    }

    public static Credential getCredentials() throws IOException {

        java.io.File clientSecretFilePath = new java.io.File(CREDENTIALS_FOLDER, CLIENT_SECRET_FILE_NAME);

        if (!clientSecretFilePath.exists()) {
            throw new FileNotFoundException("Please copy " + CLIENT_SECRET_FILE_NAME //
                    + " to folder: " + CREDENTIALS_FOLDER.getAbsolutePath());
        }

        InputStream in = new FileInputStream(clientSecretFilePath);

        GoogleClientSecrets clientSecrets = GoogleClientSecrets.load(JSON_FACTORY, new InputStreamReader(in));

        // Build flow and trigger user authorization request.
        GoogleAuthorizationCodeFlow flow = new GoogleAuthorizationCodeFlow.Builder(HTTP_TRANSPORT, JSON_FACTORY,
                clientSecrets, SCOPES).setDataStoreFactory(DATA_STORE_FACTORY).setAccessType("offline").build();
        Credential credential = new AuthorizationCodeInstalledApp(flow, new LocalServerReceiver()).authorize("user");

        return credential;
    }

    public static Drive getDriveService() throws IOException {
        if (_driveService != null) {
            return _driveService;
        }
        Credential credential = getCredentials();
        //
        _driveService = new Drive.Builder(HTTP_TRANSPORT, JSON_FACTORY, credential) //
                .setApplicationName(APPLICATION_NAME).build();
        return _driveService;
    }

}

7- SubFolder & RootFolder

If you know  ID of a directory, you can take the list of  subdirectories of this directory. Please note that in  Google Drive, a file (or a directory) can have one or more Parent  Directories.
Bây giờ, hãy xem ví dụ lấy danh sách các thư mục con của một thư mục, và ví dụ lấy ra danh sách các thư mục gốc.
GetSubFolders.java
package org.o7planning.googledrive.example;

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

import org.o7planning.googledrive.utils.GoogleDriveUtils;

import com.google.api.services.drive.Drive;
import com.google.api.services.drive.model.File;
import com.google.api.services.drive.model.FileList;

public class GetSubFolders {

    // com.google.api.services.drive.model.File
    public static final List<File> getGoogleSubFolders(String googleFolderIdParent) throws IOException {

        Drive driveService = GoogleDriveUtils.getDriveService();

        String pageToken = null;
        List<File> list = new ArrayList<File>();

        String query = null;
        if (googleFolderIdParent == null) {
            query = " mimeType = 'application/vnd.google-apps.folder' " //
                    + " and 'root' in parents";
        } else {
            query = " mimeType = 'application/vnd.google-apps.folder' " //
                    + " and '" + googleFolderIdParent + "' in parents";
        }

        do {
            FileList result = driveService.files().list().setQ(query).setSpaces("drive") //
                    // Fields will be assigned values: id, name, createdTime
                    .setFields("nextPageToken, files(id, name, createdTime)")//
                    .setPageToken(pageToken).execute();
            for (File file : result.getFiles()) {
                list.add(file);
            }
            pageToken = result.getNextPageToken();
        } while (pageToken != null);
        //
        return list;
    }

    // com.google.api.services.drive.model.File
    public static final List<File> getGoogleRootFolders() throws IOException {
        return getGoogleSubFolders(null);
    }

    public static void main(String[] args) throws IOException {

        List<File> googleRootFolders = getGoogleRootFolders();
        for (File folder : googleRootFolders) {

            System.out.println("Folder ID: " + folder.getId() + " --- Name: " + folder.getName());
        }
    }

}
Note: You have a  com.google.api.services.drive.model.File object, but not all of its fields are assigned values. Only cases in which you are interested are assigned values. On the contrary, it has null value.
FileList result = driveService.files().list().setQ(query).setSpaces("drive") //
                    // Fields will be assigned values: id, name, createdTime
                    .setFields("nextPageToken, files(id, name, createdTime)")//
                    .setPageToken(pageToken).execute();
A next example: search directories by name which are subdirectories of a directory.
GetSubFoldersByName.java
package org.o7planning.googledrive.example;

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

import org.o7planning.googledrive.utils.GoogleDriveUtils;

import com.google.api.services.drive.Drive;
import com.google.api.services.drive.model.File;
import com.google.api.services.drive.model.FileList;

public class GetSubFoldersByName {

    // com.google.api.services.drive.model.File
    public static final List<File> getGoogleSubFolderByName(String googleFolderIdParent, String subFolderName)
            throws IOException {

        Drive driveService = GoogleDriveUtils.getDriveService();

        String pageToken = null;
        List<File> list = new ArrayList<File>();

        String query = null;
        if (googleFolderIdParent == null) {
            query = " name = '" + subFolderName + "' " //
                    + " and mimeType = 'application/vnd.google-apps.folder' " //
                    + " and 'root' in parents";
        } else {
            query = " name = '" + subFolderName + "' " //
                    + " and mimeType = 'application/vnd.google-apps.folder' " //
                    + " and '" + googleFolderIdParent + "' in parents";
        }

        do {
            FileList result = driveService.files().list().setQ(query).setSpaces("drive") //
                    .setFields("nextPageToken, files(id, name, createdTime)")//
                    .setPageToken(pageToken).execute();
            for (File file : result.getFiles()) {
                list.add(file);
            }
            pageToken = result.getNextPageToken();
        } while (pageToken != null);
        //
        return list;
    }

    // com.google.api.services.drive.model.File
    public static final List<File> getGoogleRootFoldersByName(String subFolderName) throws IOException {
        return getGoogleSubFolderByName(null,subFolderName);
    }

    public static void main(String[] args) throws IOException {

        List<File> rootGoogleFolders = getGoogleRootFoldersByName("TEST");
        for (File folder : rootGoogleFolders) {

            System.out.println("Folder ID: " + folder.getId() + " --- Name: " + folder.getName());
        }
    }
    
}

8- Search Files

To search files on  Google Drive, you should use the following query condition:
  • mimeType != 'application/vnd.google-apps.folder'
FindFilesByName.java
package org.o7planning.googledrive.example;

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

import org.o7planning.googledrive.utils.GoogleDriveUtils;

import com.google.api.services.drive.Drive;
import com.google.api.services.drive.model.File;
import com.google.api.services.drive.model.FileList;

public class FindFilesByName {

    // com.google.api.services.drive.model.File
    public static final List<File> getGoogleFilesByName(String fileNameLike) throws IOException {

        Drive driveService = GoogleDriveUtils.getDriveService();

        String pageToken = null;
        List<File> list = new ArrayList<File>();

        String query = " name contains '" + fileNameLike + "' " //
                + " and mimeType != 'application/vnd.google-apps.folder' ";

        do {
            FileList result = driveService.files().list().setQ(query).setSpaces("drive") //
                    // Fields will be assigned values: id, name, createdTime, mimeType
                    .setFields("nextPageToken, files(id, name, createdTime, mimeType)")//
                    .setPageToken(pageToken).execute();
            for (File file : result.getFiles()) {
                list.add(file);
            }
            pageToken = result.getNextPageToken();
        } while (pageToken != null);
        //
        return list;
    }

    public static void main(String[] args) throws IOException {

        List<File> rootGoogleFolders = getGoogleFilesByName("u");
        for (File folder : rootGoogleFolders) {

            System.out.println("Mime Type: " + folder.getMimeType() + " --- Name: " + folder.getName());
        }

        System.out.println("Done!");
    }
    
}

9- Create a directory on Google Drive

CreateFolder.java
package org.o7planning.googledrive.example;

import java.io.IOException;
import java.util.Arrays;
import java.util.List;

import org.o7planning.googledrive.utils.GoogleDriveUtils;

import com.google.api.services.drive.Drive;
import com.google.api.services.drive.model.File;

public class CreateFolder {

    public static final File createGoogleFolder(String folderIdParent, String folderName) throws IOException {

        File fileMetadata = new File();

        fileMetadata.setName(folderName);
        fileMetadata.setMimeType("application/vnd.google-apps.folder");

        if (folderIdParent != null) {
            List<String> parents = Arrays.asList(folderIdParent);

            fileMetadata.setParents(parents);
        }
        Drive driveService = GoogleDriveUtils.getDriveService();

        // Create a Folder.
        // Returns File object with id & name fields will be assigned values
        File file = driveService.files().create(fileMetadata).setFields("id, name").execute();

        return file;
    }

    public static void main(String[] args) throws IOException {

        // Create a Root Folder
        File folder = createGoogleFolder(null, "TEST-FOLDER");
        
        System.out.println("Created folder with id= "+ folder.getId());
        System.out.println("                    name= "+ folder.getName());

        System.out.println("Done!");
    }
    
}

10- Create a file on Google Drive

There are 3 common ways for you to create a file on  Google Driver:
    1. Upload File
    2. byte[]
    3. InputStream
    CreateGoogleFile.java
    package org.o7planning.googledrive.example;
    
    import java.io.IOException;
    import java.io.InputStream;
    import java.util.Arrays;
    import java.util.List;
    
    import org.o7planning.googledrive.utils.GoogleDriveUtils;
    
    import com.google.api.client.http.AbstractInputStreamContent;
    import com.google.api.client.http.ByteArrayContent;
    import com.google.api.client.http.FileContent;
    import com.google.api.client.http.InputStreamContent;
    import com.google.api.services.drive.Drive;
    import com.google.api.services.drive.model.File;
    
    public class CreateGoogleFile {
    
        // PRIVATE!
        private static File _createGoogleFile(String googleFolderIdParent, String contentType, //
                String customFileName, AbstractInputStreamContent uploadStreamContent) throws IOException {
    
            File fileMetadata = new File();
            fileMetadata.setName(customFileName);
    
            List<String> parents = Arrays.asList(googleFolderIdParent);
            fileMetadata.setParents(parents);
            //
            Drive driveService = GoogleDriveUtils.getDriveService();
    
            File file = driveService.files().create(fileMetadata, uploadStreamContent)
                    .setFields("id, webContentLink, webViewLink, parents").execute();
    
            return file;
        }
    
        // Create Google File from byte[]
        public static File createGoogleFile(String googleFolderIdParent, String contentType, //
                String customFileName, byte[] uploadData) throws IOException {
            //
            AbstractInputStreamContent uploadStreamContent = new ByteArrayContent(contentType, uploadData);
            //
            return _createGoogleFile(googleFolderIdParent, contentType, customFileName, uploadStreamContent);
        }
    
        // Create Google File from java.io.File
        public static File createGoogleFile(String googleFolderIdParent, String contentType, //
                String customFileName, java.io.File uploadFile) throws IOException {
    
            //
            AbstractInputStreamContent uploadStreamContent = new FileContent(contentType, uploadFile);
            //
            return _createGoogleFile(googleFolderIdParent, contentType, customFileName, uploadStreamContent);
        }
    
        // Create Google File from InputStream
        public static File createGoogleFile(String googleFolderIdParent, String contentType, //
                String customFileName, InputStream inputStream) throws IOException {
    
            //
            AbstractInputStreamContent uploadStreamContent = new InputStreamContent(contentType, inputStream);
            //
            return _createGoogleFile(googleFolderIdParent, contentType, customFileName, uploadStreamContent);
        }
    
        public static void main(String[] args) throws IOException {
    
            java.io.File uploadFile = new java.io.File("/home/tran/Downloads/test.txt");
    
            // Create Google File:
    
            File googleFile = createGoogleFile(null, "text/plain", "newfile.txt", uploadFile);
    
            System.out.println("Created Google file!");
            System.out.println("WebContentLink: " + googleFile.getWebContentLink() );
            System.out.println("WebViewLink: " + googleFile.getWebViewLink() );
    
            System.out.println("Done!");
        }
        
    }
    

    11- Share Google File/Folder

    ShareGoogleFile.java
    package org.o7planning.googledrive.example;
    
    import java.io.IOException;
    
    import org.o7planning.googledrive.utils.GoogleDriveUtils;
    
    import com.google.api.services.drive.Drive;
    import com.google.api.services.drive.model.Permission;
    
    public class ShareGoogleFile {
    
        // Public a Google File/Folder.
        public static Permission createPublicPermission(String googleFileId) throws IOException {
            // All values: user - group - domain - anyone
            String permissionType = "anyone";
            // All values: organizer - owner - writer - commenter - reader
            String permissionRole = "reader";
    
            Permission newPermission = new Permission();
            newPermission.setType(permissionType);
            newPermission.setRole(permissionRole);
    
            Drive driveService = GoogleDriveUtils.getDriveService();
            return driveService.permissions().create(googleFileId, newPermission).execute();
        }
    
        public static Permission createPermissionForEmail(String googleFileId, String googleEmail) throws IOException {
            // All values: user - group - domain - anyone
            String permissionType = "user"; // Valid: user, group
            // organizer - owner - writer - commenter - reader
            String permissionRole = "reader";
    
            Permission newPermission = new Permission();
            newPermission.setType(permissionType);
            newPermission.setRole(permissionRole);
    
            newPermission.setEmailAddress(googleEmail);
    
            Drive driveService = GoogleDriveUtils.getDriveService();
            return driveService.permissions().create(googleFileId, newPermission).execute();
        }
    
        public static void main(String[] args) throws IOException {
    
            String googleFileId1 = "some-google-file-id-1";
            String googleEmail = "[email protected]";
    
            // Share for a User
            createPermissionForEmail(googleFileId1, googleEmail);
    
            String googleFileId2 = "some-google-file-id-2";
    
            // Share for everyone
            createPublicPermission(googleFileId2);
    
            System.out.println("Done!");
        }
    
    }
    

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