在休眠验证器中将参数从验证传递到自定义验证器

Question

我正在尝试使用自定义验证器来验证 bean。但是验证器需要从调用验证的方法传递给它的信息。有没有办法做到这一点？

我无法在初始化中传递它，因为它在创建 bean 时不可用。

要验证的 Bean

class vehicle {
   @VehicleNameValidator
   String vehicleName;
}

注解

@Target({ElementType.FIELD})
@Retention(RUNTIME)
@Constraint(validatedBy = VehicleNameValidatorImpl.class)
@Documented
public @interface VehicleNameValidator {
    String message() default "Invalid vehicle Name";

    Class<?>[] groups() default { };

    Class<? extends Payload>[] payload() default { };
}

自定义验证器

public class VehicleNameValidatorImpl implements ConstraintValidator<VehicleNameValidator, String[]> {

    @Override
    public boolean isValid(String vehicleName, ConstraintValidatorContext constraintValidatorContext) {
        boolean isValid = logicmethod()//some logic here
        return isValid;
    }
}

主要方法

public static void main(String[] args) {
   String whatIwantToPass = runtimelogic(args);
   vehicle veh1 = new vehicle();
   Set<ConstraintViolation<vehicle>> constraintViolations = 
   validator.validate(veh1);
}

如何将变量“whatIwantToPass”从 main 方法传递到 VehicleNameValidatorImpl。

Answer 1

如果您使用 Hibernate Validator，您可能需要查看约束验证器有效负载。在你的情况下，它看起来有点像这样：

在您的验证器实现中，您可以访问有效负载：

public boolean isValid(String vehicleName, ConstraintValidatorContext constraintValidatorContext) {
    boolean isValid = false;
    if ( constraintValidatorContext instanceof HibernateConstraintValidatorContext ) {
        final String payload = constraintValidatorContext
                .unwrap( HibernateConstraintValidatorContext.class )
                .getConstraintValidatorPayload( String.class );
        // do whatever you need
        isValid = logicmethod()//some logic here
    }
    return isValid;
}

有效负载可以在验证器工厂级别或每个验证器级别设置，如下所示：

ValidatorFactory validatorFactory = Validation.byProvider( HibernateValidator.class )
        .configure()
        .buildValidatorFactory();

String whatIwantToPass = runtimelogic( args );

Validator validator = validatorFactory.unwrap( HibernateValidatorFactory.class )
        .usingContext()
        .constraintValidatorPayload( whatIwantToPass )
        .getValidator();

// use the validator with the constraint validator payload 
vehicle veh1 = new vehicle();
Set<ConstraintViolation<vehicle>> constraintViolations = validator.validate( veh1 );

有关更详细的信息，请查看文档的这一部分 -将有效负载传递给约束验证器