Upload an image to google app engine blobstore with java programmatically

Question

I have already watched \"Writing Files to the Blobstore (Experimental)\" in the google app engine page.

This is what I have :

// Get a file service
          


        

Answer 1

You should do this:

public static BlobKey toBlobstore(Blob imageData) throws FileNotFoundException,     FinalizationException, LockException, IOException {
    if (null == imageData)
        return null;

    // Get a file service
    FileService fileService = FileServiceFactory.getFileService();

    // Create a new Blob file with mime-type "image/png"
    AppEngineFile file = fileService.createNewBlobFile("image/jpeg");// png

    // Open a channel to write to it
    boolean lock = true;
    FileWriteChannel writeChannel = fileService.openWriteChannel(file, lock);

    // This time we write to the channel directly
    writeChannel.write(ByteBuffer.wrap
        (imageData.getBytes()));

    // Now finalize
    writeChannel.closeFinally();
    return fileService.getBlobKey(file);
}

Answer 2

You can simply write binary data to blobstore:

byte[] yourBinaryData = // get your data from request
writeChannel.write(ByteBuffer.wrap(yourBinaryData));