createUserFromCsv

 public boolean createUsersFromFile(MultipartFile file) throws IOException {
        BCryptPasswordEncoder encoder = new BCryptPasswordEncoder();
        InputStreamReader reader = new InputStreamReader(file.getInputStream());
        CSVParser csvParser = new CSVParser(reader, CSVFormat.newFormat(';')
                .withRecordSeparator(",").withIgnoreEmptyLines());
        CSVPrinter printer = new CSVPrinter(new FileWriter("users.csv"), CSVFormat.EXCEL);
        List<User> users = new ArrayList<>();
        String name = "";
        String pass = "";
        for (CSVRecord record : csvParser) {
            name = record.get(0).trim();
            pass = myPasswordGenerator.generateStrongPassword();
            User user = new User();
            user.setUsername(record.get(0).trim());
            user.setPassword(encoder.encode(pass));
            user.setRoles(Arrays.asList(Role.USER));
            user.setActive(true);
            users.add(user);
            printer.printRecord(name, pass);
        }
        userRepository.insert(users);
        reader.close();
        printer.close();
        return false;
    }

 @PostMapping("/registerFromFile")
    public String registerUsersFromFile(MultipartFile file, Model model) throws IOException {
       userService.createUsersFromFile(file);
            model.addAttribute("exist", true);
        return "manager/users/usersOptions";
    }