import org.springframework.util.Assert; import java.util.HashSet; import java.util.Iterator; import java.util.Random; import java.util.Set; public class InviteCodeUtil { public static String generateInviteCode(int len) { Assert.isTrue(len > 0, "长度要大于0"); char[] chars = {'Q', 'W', 'E', '8', 'S', '2', 'D', 'Z', 'X', '9', 'C', '7', 'P', '5', 'K', '3', 'M', 'J', 'U', 'F', 'R', '4', 'V', 'Y', 'T', 'N', '6', 'B', 'G', 'H', 'A', 'L'}; Random random = new Random(); char[] inviteChars = new char[len]; for (int i = 0; i < len; i++) { inviteChars[i] = chars[random.nextInt(chars.length)]; } return String.valueOf(inviteChars); } public static void main(String[] args) { long start = System.currentTimeMillis(); Set set = new HashSet(); for (int i = 0; i < 1000000; i++) { set.add(generateInviteCode(6)); } Iterator iterator = set.iterator(); for (int i =0;i<10;i++){ System.out.println(iterator.next()); } System.out.println(); System.out.println(set.size()); } }B76BS3 994UXZ Z5H933 VTDP24 AV6BSB GZMLHF ZEDPSM FWKMZY BKD5HA RSH6LR 999536
文章来源: Java邀请码生成小工具