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How to get file type extension from byte[] (Blob). I’m reading files from DB to byte[] but i don’t know how to automatically detect file extension.
Blob blob = rs.getBlob(1);
byte[] bdata = blob.getBytes(1, (int) blob.length());
You mean you want to get the extension of the file for which the blob store the content? So if the BLOB stores the content of a jpeg-file, you want
"jpg"?That’s generally speaking not possible. You can make a fairly good guess by using some heuristic such as Apache Tikas content detection.
A better solution however, would be to store the mime type (or original file extension) in a separate column, such as a
VARCHAR.