io.rocketbase.commons.service.KeyGenerator Maven / Gradle / Ivy
package io.rocketbase.commons.service;
import java.security.SecureRandom;
public final class KeyGenerator {
private static final String ALPHABET = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
private static final String SPECIAL_SIGN = "!#$%&()*+,-./:;<=>?@[]^_`{|}~";
private static final String ALPHABET_WITH_SPECIAL = ALPHABET + SPECIAL_SIGN;
private static SecureRandom RANDOM = new SecureRandom();
/**
* random string with alphabet of 0-9 + a-z (lower/upper)
*
* @param length of string
* @return random string
*/
public static String random(int length) {
StringBuilder sb = new StringBuilder(length);
for (int i = 0; i < length; i++)
sb.append(ALPHABET.charAt(RANDOM.nextInt(ALPHABET.length())));
return sb.toString();
}
/**
* random string with alphabet of 0-9 + a-z (lower/upper)
* plus special sings of "!#$%&()*+,-./:;<=>?@[]^_`{|}~"
*
* @param length of string
* @return random string
*/
public static String randomWithSpecialSigns(int length) {
StringBuilder sb = new StringBuilder(length);
for (int i = 0; i < length; i++)
sb.append(ALPHABET_WITH_SPECIAL.charAt(RANDOM.nextInt(ALPHABET_WITH_SPECIAL.length())));
return sb.toString();
}
}