public void addUser(RegisterForm form) {
   User user = new User();
   user.setUsername(form.getUsername());
   user.setEmail(form.getEmail());
   user.setPassword(form.getPassword());
   user.setEnabled(true);
   user.setAuthority("ROLE_USER");
   userDao.save(user);
 }
 public void setAvatar(User user, MultipartFile avatar) throws IOException {
   user.setAvatar(IOUtils.toByteArray(avatar.getInputStream()));
   userDao.save(user);
 }
 public void blockUser(String username) {
   User user = userDao.getUserByName(username);
   user.setEnabled(!user.isEnabled());
   userDao.save(user);
 }