Java SecureRandom generate URL like Medium.com (Random 12 characters)

Question

Instead of using the Long type do the Primary key, I found seems Medium.com using 12 characters. Can anyone let me know the algorithm or similar way to create it.

For example: medium.com/**/nosuchmethoderror-in-log4j-issue-3a80f0c412c

Hash (current timestamp + blabla +...) => like: 3a80f0c412c

I heard using Java SecureRandom quite good but I haven't really understood it. Someone can show me the code? Tks

Answer 1

If you just need 12 random characters, you could generate a UUID and then take a substring:

UUID uuid = UUID.randomUUID();
System.out.println(uuid.toString().replaceAll("-", "").substring(0, 12));

Demo