Write bytes from blob IMAGE into a txt file

Question

I wrote this code to convert one of my documents from "blob" IMAGE to txt file. Export works properly. When I open the file, it not contains only text but another the information, like file name, path and then obscure information. I attach an example: File name: new 1.txt Text original file: CIAO6

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 protected void onEventImpl(Event event)
            {
                 ...
                String fileName = aaDocumentoMultimedia.getPercorso();
                byte[] documento = aaDocumentoMultimedia.getDocumento();
                Date docData = aaDocumentoMultimedia.getDataRegistrazione();
                if (StringUtils.isNotBlank(fileName))
                {
                    migrazioneDocumentiManager.writeFileOnDisk(fileName, documento, docData);
                }
                 ...
            }



@Override
public void writeFileOnDisk(String fileName, byte[] documento, Date registrationData) throws SQLException, FileNotFoundException, IOException
{
    ByteArrayInputStream input = null;
    FileOutputStream output = null;
    try
    {
        (new File(getPathFile(registrationData))).mkdirs();

        input = new ByteArrayInputStream(documento);
        output = new FileOutputStream(new File(getPathFile(registrationData) + fileName));

        byte[] buffer = new byte[1024 * 4];
        int n = 0;
        while (-1 != (n = input.read(buffer)))
        {
            output.write(buffer, 0, n);
        }
        output.flush();

    }
    catch (IOException e)
    {
        e.printStackTrace();
    }
    finally
    {
        if (input != null)
        {
            input.close();
        }
        if (output != null)
        {
            output.close();
        }
    }
}

Answer 1

Well, two points:

• You have to ensure this code is executed within the data base session, other way you won't read correctly blob content.
• Although you flushed output stream, you don't close input/output streams, it would be nice.

Considerations away, your code is ok, so, are you sure your blob content is ok? You could test your blob content with some apps as squirrelSql. Maybe your problem is when storing blob?

Instead the while bucle, you could also use org.apache.commons.io.FileUtils from apache-commons-io (I used 2.4) this is what I used to convert from blob to files:

FileUtils.copyInputStreamToFile(inStream, blobFile);

With this approach you won't need outStream, length, size and buffer.