JSPWiki - a JSP-based WikiWiki clone.
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public class StringUtils
private static final Random RANDOM = new SecureRandom();
/** Length of password. @see #generateRandomPassword() */
public static final int PASSWORD_LENGTH = 8;
* Generate a random String suitable for use as a temporary password.
* @return String suitable for use as a temporary password
* @since 2.4
public static String generateRandomPassword()
// Pick from some letters that won't be easily mistaken for each
// other. So, for example, omit o O and 0, 1 l and L.
String letters = "abcdefghjkmnpqrstuvwxyzABCDEFGHJKMNPQRSTUVWXYZ23456789+@";
String pw = "";
for (int i=0; i<PASSWORD_LENGTH; i++)
int index = (int)(RANDOM.nextDouble()*letters.length());
pw += letters.substring(index, index+1);