How to get the path of a file saved in blobstore ?

[anuja bothra]

Hi,

I have data in an excel sheet.

I need to read that data and save it to the datastore.

I am able to upload the excel to blobstore.

How do I get the excel file path to pass to POI (so that I can read the cell contents) ? 

My code is in Java

Thanks,

Anuja 

[Alejandro González Rodrigo]

Hello Anuja,

When you upload a file to the blobstore, in the /_ah/upload callback you can grab the BlobKey that was uploaded:

BlobstoreService blobstoreService = BlobstoreServiceFactory.getBlobstoreService();

Map<String, List<BlobKey>> blobs = blobstoreService.getUploads(request);

BlobKey blobKey = blobs.get("file").get(0);

You need that blobkey to access the file again. If you want to accecss the file later, you might want to store it somewhere in the datastore.

With the BlobKey you can retrieve a byte[] of the file to do whatever you want:

byte[] file = blobstoreService.fetchData(blobKey, 0, BlobstoreService.MAX_BLOB_FETCH_SIZE-1);

Hopes that helps.

Good luck!

 

2013/11/14 anuja bothra <anuja...@gmail.com>

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Alejandro González
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If you have a dream we can write the code

[anuja bothra]

I actually wanted to parse the file in POI since I already had written code for that in a local app.

FileInputStream myInput = new FileInputStream(filePath);

POIFSFileSystem myFileSystem = new POIFSFileSystem(myInput);

I need the "filePath" (the excel file's path) so that I can just pass that and reuse the code that I had already written.

Is that not possible ?

Thanks 

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[Alejandro González Rodrigo]

Hello Anuja,

No, that is not possible because the actual file is not in the filesystem. But with the byte[] you can easily get a InputStream checkout: http://stackoverflow.com/questions/1802123/can-we-convert-a-byte-array-into-an-inputstream-in-java

InputStream myInputStream = new ByteArrayInputStream(file);

POIFSFileSystem myFileSystem = new POIFSFileSystem(myInputStream);

2013/11/14 anuja bothra <anuja...@gmail.com>

[anuja bothra]

Hey Thanks Alejandro !!