自定义验证器触发两次

如果该类被标记为@Validated，那么至少有一个字段标记有我的自定义注释的实体@Unique将被检查两次。此外，第一次验证器将有一个注入的上下文和服务，第二次一切都将为空。在我看来，由于@Validated实体被检查了两次，但我不明白为什么，甚至为什么没有注入的上下文和服务？

如果未标记该类，则即使使用我的自定义注释，也可以很好地签出实体。但是参数验证不起作用，例如，publicString someFunction (@RequestParam ("email") @Email String email)如果您明确发送的不是电子邮件地址，那么一切都将转到服务，但@Validated在课堂上它已经给出了电子邮件不合适的消息。

为注解服务的类

public class UniqueValidator implements ConstraintValidator<Unique, Object> {

@Autowired
private ApplicationContext applicationContext;

@Autowired
private FieldValueExists service;
private String fieldName;

@Override
public void initialize(Unique unique) {

    Class<? extends FieldValueExists> clazz = unique.service();
    this.fieldName = unique.fieldName();
    String serviceQualifier = unique.serviceQualifier();

    if (!serviceQualifier.equals("")) {
        this.service = this.applicationContext.getBean(serviceQualifier, clazz);
    } else {
        this.service = this.applicationContext.getBean(clazz);
    }
}

@Override
public boolean isValid(Object o, ConstraintValidatorContext constraintValidatorContext) {
    return !this.service.fieldValueExists(o, this.fieldName);
}
}

注解

@Target(FIELD)
@Retention(RUNTIME)
@Constraint(validatedBy = UniqueValidator.class)
public @interface Unique {
    String message() default "Field is not unique";
    Class<?>[] groups() default {};
    Class<? extends Payload>[] payload() default {};
    Class<? extends FieldValueExists> service() default FieldValueExists.class;
    String serviceQualifier() default "";
    String fieldName();
}

来自实体的一段代码，其字段由我的验证器验证

@JsonRootName("userCreate")
public class UserModelCreateDto {

@Size(min = 4, max = 32)
@NotBlank
@Unique(fieldName = "login", serviceQualifier = "userServiceImpl")
private String login;

控制器

 @RestController
 @Validated
 public class AuthenticationController {

     private static Logger LOG = Logger.getLogger(AuthenticationController.class);

     @Autowired
     private UserService userService;

     @Autowired
     private ModelMapper modelMapper;


     @PostMapping("/sign-up")
     @ResponseStatus(HttpStatus.OK)
     public UserModelDto saveUser(@Valid @RequestBody UserModelCreateDto userModelCreateDto, BindingResult result) {
         if (result.hasErrors()) {
             throw new ValidationException(getValidationErrorsAsString(result));
         } else {
             UserModelDto user = userService.save(userModelCreateDto);
             LOG.info("User #" + user.getId() + " has been create account");
             return user;
         }
     }

豆

@Bean
public Validator validator (final AutowireCapableBeanFactory autowireCapableBeanFactory) {

    ValidatorFactory validatorFactory = Validation.byProvider( HibernateValidator.class )
            .configure().constraintValidatorFactory(new SpringConstraintValidatorFactory(autowireCapableBeanFactory))
            .buildValidatorFactory();
    return validatorFactory.usingContext().getValidator();
}