@Configuration
public class BeforeStartup implements ApplicationListener<ContextRefreshedEvent> {

 @Autowired
 private InitDB initDB;

 @Override
 public void onApplicationEvent(ContextRefreshedEvent contextRefreshedEvent) {
  initDB.createUser();
 }

}

@Component
public class InitDB {

 Logger log = Logger.getLogger(MyInvocationSecurityMetadataSource.class);

 @Autowired
 private UserService userService;

 // create user
 public void createUser() {
  User user = new User();
  user.setAvatar("aaa");
  user.setBlock(false);
  user.setEmail("aaa");
  user.setInTime(new Date());
  user.setPassword("1111");
  user.setSignature("1111");
  user.setUrl("222");
  user.setUsername("bb");
  userService.save(user);
 }
}