How to download byte[] array, stored in database, as a file?

We use Spring framework to develop our online system. Users now can upload their files. Data is stored in PostrgreSQL DB and associated with byte[] type attribute of a java class (through Hibernate). How can I perfom invert operation - transform a byte stream into a file and allow user to download it? Thanx

public void writeToFile(byte[] b, String directory, String filename) throws IOException {
   File outputFile = new File(directory, filename);
   OutputStream outputStream = new FileOutputStream(outputFile);

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