public class User {
  @NotBlank(message = "Username can not be empty")
  private String username;
  @NotBlank(message = "password can not be blank")
  @Length(min = 6, max = 16, message = "The length of the password must be between 6 and 16 bits")
  private String password;
  @Range(min = 18, max = 60, message = "Age must be between 18 and 60 years old")
  private Integer age;
  @Pattern(regexp = "^1[3|4|5|7|8][0-9]{9}$", message = "Please enter the correct format of the phone number")
  private String phone;
  @Email(message = "Please enter a valid email address")
  private String email;

  // other...  
}

@RequestMapping(value = "/register")
public String register(@Valid @ModelAttribute("user") User user, Errors errors,Model model) {
  if(errors.hasErrors()){
    return "register";
  }
  model.addAttribute("user", user);
  return "success";
}

  

    
register
    

      name:
      
      
    
     ...
  

username.not.blank = "username cannot be empty..."
password.not.blank = "password cannot be empty"
password.not.length = "password should be in 6-10"
age.not.range = "age should be in 10-70"
phone.not.pattern = "phone should be in format"
email.not.format = "email should be in format"

public class User {
  
  @NotBlank(message = "{username.not.blank}")
  private String username;
  
  @NotBlank(message = "{password.not.blank}")
  @Length(min = 6, max = 10, message = "{password.not.length}")
  private String password;
  
  @Range(min = 10, max = 70, message = "{age.not.range}")
  private Integer age;
  
  @Pattern(regexp = "^1[3|4|5|7|8][0-9]{9}$", message = "{phone.not.pattern}")
  private String phone;
  
  @Email(message = "{email.not.format}")
  private String email;
  
  // other...
}