Uploading binary files using dropbox java api

Question

Could you point me out to a code or url where I can find some examples how to use dropbox java api and upload binary files like, .doc files jpg and video files.

Current examples in the web only point to uploading a text file. But when I try to read files using java InputStream and convert them to byte array and pass into dropbox file upload functions files get corrupted. Same issue with downloading files as well. Thanks in Advance.

Regards, Waruna.

EDIT-- Code Sample

FileInputStream fis = new FileInputStream(file);
ByteArrayOutputStream bos = new ByteArrayOutputStream();
byte [] buf = new byte[1024];
for(int readNum; (readNum = fis.read(buf)) != -1;) {
    bos.write(buf, 0, readNum);
    System.out.println("read "+ readNum + "bytes,");
}

ByteArrayInputStream inputStream2 = new ByteArrayInputStream(bos.toByteArray());

Entry newEntry = mDBApi.putFile("/uploads/"+file.getName(), inputStream2, file.toString().length(), null, null);
System.out.println("Done. \nRevision of file: " + newEntry.rev + " " + newEntry.mimeType);
return newEntry.rev;

Post your code, so we can suggest you where it is wrong!

dash1e
– dash1e

2012-04-14 12:37:12 +00:00
Commented Apr 14, 2012 at 12:37 — dash1e
– dash1e, Commented Apr 14, 2012 at 12:37
Hi, thanks, I update the question with my code.

Waruna
– Waruna

2012-04-14 23:51:12 +00:00
Commented Apr 14, 2012 at 23:51 — Waruna
– Waruna, Commented Apr 14, 2012 at 23:51

Torious · Accepted Answer · 2012-04-15 00:01:59Z

1

The 3rd argument of DropboxAPI.putFile() should be the number of bytes to read from the input stream - You are passing the length of the filename.

Instead of

Entry newEntry = mDBApi.putFile("/uploads/"+file.getName(), inputStream2,
            file.toString().length(), null, null);

Use

Entry newEntry = mDBApi.putFile("/uploads/"+file.getName(), inputStream2,
            bos.size(), null, null);

answered Apr 15, 2012 at 0:01

Torious

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1 Comment

Waruna Over a year ago

Thanks for your answer, this work perfectly. I lost quite a lot of development time because of this small mistake.

Rick Sun · Accepted Answer · 2012-07-11 17:35:53Z

I don't think you need to convert to byte array, simply use FileInputStream is enough for a file, txt as well as binary. The following code works, I just tested with JPG.

    DropboxAPI<?> client = new DropboxAPI<WebAuthSession>(session);

    FileInputStream inputStream = null;
    try {
        File file = new File("some_pic.jpg");
        inputStream = new FileInputStream(file);
        DropboxAPI.Entry newEntry = client.putFile("/testing.jpg", inputStream,
                file.length(), null, null);
        System.out.println("The uploaded file's rev is: " + newEntry.rev);
    } catch (DropboxUnlinkedException e) {
        // User has unlinked, ask them to link again here.
        System.out.println("User has unlinked.");
    } catch (DropboxException e) {
        System.out.println("Something went wrong while uploading.");
    } catch (FileNotFoundException e) {
        System.out.println("File not found.");
    } finally {
        if (inputStream != null) {
            try {
                inputStream.close();
            } catch (IOException e) {}
        }
    }

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