java - 将散列字节数组转换为字符串

Answer 1

You need to encode the byte array into a Base64 string, then decode it back to a byte array when you read it from the database. Note that the encoded string will be around 33% larger than the original byte array.

Answer 2

If you'll always consume your key as a byte[] in your application it would be far better to save it as a BLOB binary object itself in the database. You'll save yourself from conversion errors.