How copy folder with sub folders include files into google cloud storage with JAVA API

[VitalyTarasiuk via StackOverflow]

How can i make copy folder from local disk (for example: ubunto OS) with sub-folder that include several files into google cloud storage using GOOGLE API with JAVA , with the BEST PERFORMANCE.
(Something like copy & paste the local directory into google cloud using api)

File hierarchy :

• root folder -->

  • sub folder 1 : { file1 , file2 , ...}

  • sub folder 2 : { file3 , file4 , ...}

  attached code snippet:

InputStreamContent content = new InputStreamContent(contentType, fileData);

    Storage client = new Storage.Builder(httpTransport, JSON_FACTORY, credential).setApplicationName(APPLICATION_NAME).build();
    try {

        Storage.Objects.Insert insert = client.objects().insert(bucketName, null, content);
        insert.setName(fileName);
        insert.setPredefinedAcl("publicRead");

but this code only insert file ( object) into pre-configured folder.

Any ideas please?

BR

Vitaly

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