How to generate a random alpha-numeric string

Question

I\'ve been looking for a simple Java algorithm to generate a pseudo-random alpha-numeric string. In my situation it would be used as a unique session/key identifie

Answer 1

I'm using a library from Apache Commons to generate an alphanumeric string:

import org.apache.commons.lang3.RandomStringUtils;

String keyLength = 20;
RandomStringUtils.randomAlphanumeric(keylength);

It's fast and simple!