How read XLS file from gcp bucket

Question

I have on bucket XLS file and I have to pull the file and read the data on the stream and work with data. I worked with CSV file and this is my code:

try (ReadChannel reader = storage.reader(bucketName, fileName)) {   
            ByteBuffer bytes = ByteBuffer.allocate(BUFFER_SIZE);
            while (reader.read(bytes) > 0) {
                bytes.flip();
                // outChannel.write(bytes);
                set(new String(bytes.array(), "UTF-8"), fileName); 
                bytes.clear();
            }
        }

Answer 1

I think this might be what you are looking for. GCS Input Channel

GcsService gcsService = GcsServiceFactory.createGcsService();
GcsFilename fileName = new GcsFilename("TestBucket", "Test1.xlsx"); 
GcsInputChannel readChannel = gcsService.openPrefetchingReadChannel(fileName, 0, BUFFER_SIZE);
InputStream inputStream = Channels.newInputStream(readChannel);

I've also found an interesting workaround that might help you, in this answer you have a piece of code that converts all the excel files to CSV to let you manipulate them as normal if you wish to.

EDIT: The error was there because it was not initialized. Have a look at my code edit.

In your case as far as I understood you might need to use " OutputChannel " not "InputChannel" but it's the same concept.

Hope this helps.