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The collections of utility classes is used regularly

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package com.github.naviit.libs.common.util;

import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Random;

public class GenerateRandomString {

	private static final char[] VALUES = {'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','0','1','2','3','4','5','6','7','8','9'};

	private static Random random = new Random(Calendar.getInstance().getTimeInMillis());

	public GenerateRandomString() {
		super();
	}

	public static StringBuilder generateRandomString(int length) {
		StringBuilder builder = new StringBuilder();
		for (int i = 0; i < length; i++) {
			int idx = random.nextInt(VALUES.length);
			builder.append(VALUES[idx]);
		}
		return builder;
	}

	public static String generateAvatarFileName() {
		return generateRandomString(5).append(new SimpleDateFormat("yyyyMMddHHmmss").format(Calendar.getInstance().getTime())).toString();
	}

}