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Nadron is a high speed socket based java game server written using Netty and Mike Rettig's Jetlang. It is specifically tuned for network based multiplayer games and supports TCP and UDP network protocols.

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package io.nadron.util;

import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;

public class RandomStringGenerator
{
	public static final int DEFAULT_LENGTH = 8;

	static char[] alphaNumberic = new char[] { 'A', 'B', 'C', 'D', 'E', 'F',
			'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S',
			'T', 'U', 'V', 'W', 'X', 'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f',
			'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's',
			't', 'u', 'v', 'w', 'x', 'y', 'z', '1', '2', '3', '4', '5', '6',
			'7', '8', '9', '0' };

	public static String generateRandomString(int length)
	{
		String random = "ACK";
		
		int len = DEFAULT_LENGTH;
		if (length > 0)
		{
			len = length;
		}
		
		char[] randomChars = new char[len];
		try
		{
			SecureRandom wheel = SecureRandom.getInstance("SHA1PRNG");
			for (int i = 0; i < len; i++)
			{
				int nextChar = wheel.nextInt(alphaNumberic.length);
				randomChars[i] = alphaNumberic[nextChar];
			}
			random = new String(randomChars);
		}
		catch (NoSuchAlgorithmException e)
		{
			// TODO Auto-generated catch block
			e.printStackTrace();
		}

		return random;
	}
}