/*** 获取唯一的邀请码** @return the string*/private String generateUserUniqueShareCode() {Set<String> arr = getSetArr();String code;do {code = generateCode(arr);} while (isCodeUserExists(code));return code;}/*** Gets set arr.** @return the set arr*/@NotNullprivate static Set<String> getSetArr() {return new HashSet<>(Arrays.asList("0", "1", "2", "3", "4", "5", "6", "7", "8", "9","a", "b", "c", "d", "e", "f", "g", "h", "j", "k", "m","n", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y","z", "A", "B", "C", "D", "E", "F", "G", "H", "J", "K","M", "N", "P", "Q", "R", "S", "T", "U", "V", "W", "X","Y", "Z"));}/*** 获取随机邀请码** @param arr the arr* @return the string*/private String generateCode(Set<String> arr) {StringBuilder code = new StringBuilder();Random random = new Random();for (int i = 0; i < 6; i++) {code.append(new ArrayList<>(arr).get(random.nextInt(arr.size())));}return code.toString();}/*** 判断邀请码是否存在** @param code the code* @return the boolean*/private boolean isCodeUserExists(String code) {LambdaQueryWrapper<BusinessUser> queryWrapper = new LambdaQueryWrapper<>();queryWrapper.eq(BusinessUser::getShareCode, code);return businessUserService.getOne(queryWrapper) != null;}

并且需要在parent的pom.xml中添加notnull引用

      <dependency><groupId>org.jetbrains</groupId><artifactId>annotations</artifactId><version>RELEASE</version><scope>compile</scope></dependency>