VFSLib Google Drive Example

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22

// Setup the main VFSLib instance
VFSLib vfslib = new VFSLib();

// We use the default file system manager here
DefaultFileSystemManager fsmanager = (DefaultFileSystemManager) VFS.getManager();

// Add Google Drive provider to VFS
GDriveFileProvider provider = vfslib.addProviderGoogleDrive(fsmanager, clientid, 
 clientsecret, appname, redirecturi);
String scheme = vfslib.getSchemeGoogleDrive();

// Pass access token over to VFSLib to access the Google Drive account
FileSystemOptions options = new FileSystemOptions();
GDriveFileSystemConfigBuilder builder = new GDriveFileSystemConfigBuilder();
builder.setAccessToken(options, token);
builder.setUseTrash(options, true); // Allow deleted entries be restored

// Setup proper account name, used as user name for Google Drive URLs (failsafe is "anonymous"):
// gdrive://[name]:[token]@drive.google.com
String username = "johndoe";
builder.setAccountDisplayName(options, username);

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15

String uri = scheme + "://" + username + "@drive.google.com";
try {
 FileObject fileobj = fsmanager.resolveFile(uri, options);
 if (fileobj.getType().equals(FileType.FOLDER)) {
 FileObject[] childs = fileobj.getChildren();
 for (FileObject next : childs) {
 if (next.getType().equals(FileType.FOLDER)) {
 System.out.println(" DIR: " + String.valueOf(next));
 }
 else System.out.println(" FILE: " + String.valueOf(next));
 }
 }
 else System.out.println(" Entry " + uri + " is not a folder");
}
catch (Exception e) { e.printStackTrace(); }

1
2
3
4
5
6
7
8
9
10
11

String tempfolder = scheme + "://" + username + "@drive.google.com/0123456789abcdefghijklmnopqrstuvwxyz";
boolean success = false;
try {
 FileObject fileobj = fsmanager.resolveFile(tempfolder, options);
 if (!fileobj.exists()) {
 fileobj.createFolder();
 success = fileobj.exists();
 }
}
catch (Exception e) { e.printStackTrace(); }

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21

String content = "Hello world!";
String encoding = "ISO-8859-1";

// Upload a file to Google Drive. Get file type, last modified, and size.
String tempfile = tempfolder + "/readme.txt";
try {
 FileObject fileobj = fsmanager.resolveFile(tempfile, options);
 fileobj.getContent().setAttribute(VFSLibConstants.ATTR_CONTENT_LENGTH, content.getBytes(encoding).length);
 OutputStream ostream = fileobj.getContent().getOutputStream();
 ostream.write(content.getBytes(encoding));
 ostream.flush();
 ostream.close();

 success = fileobj.exists();

 System.out.println(" TYPE: " + fileobj.getType().getName());
 System.out.println(" MOD: " + new Date(fileobj.getContent().getLastModifiedTime()));
 System.out.println(" SIZE: " + fileobj.getContent().getSize());
}
catch (Exception e) { e.printStackTrace(); }

1
2
3
4
5
6
7
8
9

String tempfilerenamed = tempfolder + "/README";
try {
 FileObject fileobj = fsmanager.resolveFile(tempfile, options);
 FileObject fileobjrenamed = fsmanager.resolveFile(tempfilerenamed, options);
 fileobj.moveTo(fileobjrenamed);
 success = fileobjrenamed.exists();
 if (success) tempfile = tempfilerenamed;
}
catch (Exception e) { e.printStackTrace(); }

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17

try {
 FileObject fileobj = fsmanager.resolveFile(tempfile, options);
 ByteArrayOutputStream bostream = new ByteArrayOutputStream();
 InputStream istream = fileobj.getContent().getInputStream();
 int len;
 byte[] buffer = new byte[1024];
 while ((len = istream.read(buffer)) != -1) {
 bostream.write(buffer, 0, len);
 }
 istream.close();
 bostream.flush();
 bostream.close();
 String loaded = new String(bostream.toByteArray(), encoding);

 success = loaded.equals(content);
}
catch (Exception e) { e.printStackTrace(); }

1
2
3
4
5
6
7
8
9
10

try {
 // Remove file
 FileObject fileobj = fsmanager.resolveFile(tempfile, options);
 success = fileobj.delete();

 // Remove folder
 fileobj = fsmanager.resolveFile(tempfolder, options);
 success = fileobj.delete();
}
catch (Exception e) { e.printStackTrace(); }