A sample Java class that generates a URL safe random token

RandomWebToken.java

import java.security.SecureRandom;
import java.util.Base64;
import java.util.Base64.Encoder;

public class RandomWebToken
{
  public static void main(String[] args)
  {
    SecureRandom random = new SecureRandom();
    byte bytes[] = new byte[128];
    random.nextBytes(bytes);
    Encoder encoder = Base64.getUrlEncoder().withoutPadding();
    String token = encoder.encodeToString(bytes);
    System.out.println(token);
  }
}

hmmm what do you call a safe token?

base64-encoded string can contain slashes. )