java - 如何使用继承自定义标准 hibernate 验证？

Question

我这样注释字段:

@Min(100)
private Long cost;

为了实现最小值的动态更新，我从 hibernate validator 类扩展:

public class CustomMinValidator extends MinValidatorForNumber {
    public void initialize(final Long minValue) {
        Min min = new Min() {
            @Override
            public String message() {
                return null;  //To change body of implemented methods use File | Settings | File Templates.
            }

            @Override
            public Class<?>[] groups() {
                return new Class<?>[0];
            }

            @Override
            public Class<? extends Payload>[] payload() {
                return null;
            }

            @Override
            public long value() {
                return minValue;
            }

            @Override
            public Class<? extends Annotation> annotationType() {
                return null;
            }
        };
        super.initialize(min);
    }
}

注册bean，它将刷新配置中的最小值:

@Component
public class MinValidatorRefresher {
    @Autowired
    MessageSource messageSource;
    @Autowired
    CustomMinValidator customMinValidator;

    @PostConstruct
    private void refreshMinValue() {
        Long minValue;
        try {
            minValue = Long.valueOf(messageSource.getMessage("Terminal.MinValue", null, Locale.getDefault()));
        } catch (NumberFormatException e) {
            return;
        }
        customMinValidator.initialize(minValue);
    }
}

当我启动应用程序时，我看到以下消息:

Caused by: org.springframework.beans.factory.BeanCreationException: Could not autowire field: com.terminal.domain.validation.validators.CustomMinValidator com.terminal.configuration.MinValidatorRefresher.customMinValidator; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [com.terminal.domain.validation.validators.CustomMinValidator] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:509)
    at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:87)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:290)
    ... 65 more
Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [com.terminal.domain.validation.validators.CustomMinValidator] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.raiseNoSuchBeanDefinitionException(DefaultListableBeanFactory.java:1118)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:967)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:862)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:481)
    ... 67 more

消息对我来说很清楚，但我不明白如何解决它？

附注

我的主要想法是我想扩展默认使用 hibernate 的类并将其替换为我的新实现。

Answer 1

将@Component标签添加到CustomMinValidator类。

@Component
public class CustomMinValidator extends MinValidatorForNumber

为了启动一个 bean，您需要在 CustomMinValidator 类中使用 no-arg 构造函数。由于您没有任何其他构造函数，因此默认的无参数构造函数应该足够了。