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Upload files to Google Drive from App Engine application

I'm trying to implement App Engine app that should upload files from user computer to Team Drive folder.
Currently I'm trying to do it with .jsp and servlets but it seems that it couldn't be done that way.
I'm using Service Account and Drive API Client Library for Java - https://developers.google.com/api-client-library/java/apis/drive/v3
It seems that when uploading files in such way you should use java.io.File which is impossible on App Engine, because file isn't stored on instance but it is uploaded from user computer.
Is it any way to upload file directly to Google Drive using App Engine?
Additional note:
I'm using Drive API v3.
In Drive API v2 there was file.insert() method available which lets you sending InputStream as input parameter. I think such method could help me with upload but it is not included in API v3.
https://developers.google.com/drive/api/v2/reference/files/insert

I think you're looking for protected Create(File content, com.google.api.client.http.AbstractInputStreamContent mediaContent) from https://developers.google.com/resources/api-libraries/documentation/drive/v3/java/latest/

Storing and retrieve images with google app engine in android?

I developed an android app with google app engine as a server.
Now I want to add photo sharing feature in my app,
Google app engine provides Cloud Datastore/Cloud Storage for large data like images.
My question is that is Cloud Datastore an efficient way for storing and retrieving images or any other third party database is more efficient than Cloud data store/cloud storage.
Please guide me and give me your helpful suggestions.

Cloud Storage is a better solution than a database for storing and serving images, and allows you to do things like Signed URLs (serving content directly, securely).
Directly from the "Choosing a Storage Option" page:
Google Cloud Storage
Description: A scalable, fully-managed, highly reliable, and cost-efficient object / blob store.
Good for:
Images and videos
Objects and blobs
Unstructured data

Azure storage blob upload from url

Is there a way to do this?
I have plenty of files over few servers and Amazon s3 storage and need to upload to Azure from an app (Java / Ruby)
I prefer not to download these files on my app server and then upload it to Azure blob storage.
I've checked the Java and Ruby sdk, it seems there's no straight way to do this based on the examples (means I have to download these files first on my app server and upload it to Azure)
Update:
Just found out about CloudBlockBlob.startCopy() in the Java SDK.
Tried it and it's basically what I want without using Third party tools like AzCopy.

You have a few options, mostly licensed, but I think that AzureCopy is your best free alternative. You can check a step by step experience on MSDN Blogs.
All you need is your Access Keys for both services and with a simple command:
azurecopy -i https://mybucket.s3-us-west-2.amazonaws.com/ -o https://mystorage.blob.core.windows.net/mycontainer -azurekey %AzureAccountKey% -s3k %AWSAccessKeyID% -s3sk %AWSSecretAccessKeyID% -blobcopy -destblobtype block
You can pass blobs from one container to the other.

As #EmilyGerner said, AzCopy is the Microsoft offical tool, and AzureCopy that #MatiasQuaranta said is the third party tool on GitHub https://github.com/kpfaulkner/azurecopy.
The simple way is using AWS Command Line and AzCopy to copy all files from S3 to local directory to Azure Blob Storage. You can refer to my answer for the other thread Migrating from Amazon S3 to Azure Storage (Django web app). But it is only suitable for a small data size bucket.
The other effective way is programming with SDKs of Amazon S3 and Azure Blob Storage for Java. Per my experience, Azure SDK APIs for Java is similiar with C#‘s， so you can try to refer to Azure Blob Storage Getstarted doc for Java and AWS SDK for Java to follow #GauravMantri sample code to rewrite code in Java.

how can i download a file in google cloud storage using BlobstoreService java

Since 2 days Googling, I got to upload a file in Google Cloud Storage using java. Now I am facing troubles to download the same file from Google Cloud Storage using java.
I tried with BlobstoreService to upload a file. Can any body give me the suggestions to download from the GCS?

If you want to read a file on Google Cloud Storage from an App Engine application, you need to use the Google Cloud Storage Java Client Library, or you can read it using Blobstore API after you get the blobstore key using the function createGsBlobKey.
Using Google Cloud Storage Java Client Library in order to read/write files is fairly simple. Check out this page for more info:
https://developers.google.com/appengine/docs/java/googlecloudstorageclient/getstarted

What are the prerequisites for using Google App Engine with Android?

I am new to Android Application Development and know all the stuff, which is required to build an Application which can use the local resources (databases and all that stuff). I want to build an Application, which will interact with the Application server. And I chose Google App Engine as my Application server. As I am slightly new to this topic, I just want to know, what are the prerequisites for doing both client and server side programming.
I would require to store some data on Google App Engine and interact with the apps with reference to the same.
P.S. I have chosen Java as my language with Google App Engine.

I don't think that there is any prerequisites for using android with google app engine.
Google App Engine is a PAAS, u can write the server side and it should work irrespective of Android, iPhone or any other device. For data transfer you can use XML or JSON format, see this if u are interested in creating REST services.Create and Deploy a JAX-RS REST service on Google App Engine
For data transfer from server to android device, u can use Google Cloud Messaging Google Cloud Messaging for Android