Upload a file to Google Storage on GAE Java

Which is the best way to upload a file generated by my Google App Engine app to Google Storage? My GAE app is in java.

I tried to use JetS3开发者_开发知识库t but it didn't work on GAE because it use threads.

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Google APIs Java Client is a recommended way to access Google APIs from Java clients. There are examples for most APIs, but unfortunately not yet for Storage (the issue mentioned was resolved).