java - 如何通过反射或任何其他方式手动触发 javax 验证？

Question

我正在使用validation-api-2.0.1.Final和hibernate-validator-6.0.13.Final 。我想对以下情况进行验证，

我创建了一个自定义验证来验证 List<Map<String,Object>>

BookInfo.java

@Target({METHOD, FIELD, ANNOTATION_TYPE, CONSTRUCTOR, PARAMETER, TYPE_USE})
@Retention(RetentionPolicy.RUNTIME)
@Documented
@Constraint(
        validatedBy = {BookInfoValidator.class}
)
public @interface BookInfo {
    String message() default "Should not be empty";

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

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

BookInfoValidator.java

public class BookInfoValidator implements ConstraintValidator<ValidateUserInfo, List<Map<String, Object>>> {

    private final ContentRepositoryClient contentRepository;

    public ValidateUserInfoValidator(ContentRepositoryClient contentRepository) {
        this.contentRepository = contentRepository;
    }

    @Override
    public void initialize(ValidateUserInfo constraintAnnotation) {

    }

    @Override
    public boolean isValid(List<Map<String,Object>> map, ConstraintValidatorContext constraintValidatorContext) {
        //In the list of Map the key will be "text,email,date etc etc" based on the key i would like to
        //validate with the proper validation constraints
        //ex) for Email invoke javax.validation.constraints.Email.class from validation-api
        //I am not sure how to manually invoke the validation annotations.
        return false;
    }
}

BookInfoView.java

class BookInfoView {
        @BookInfo
        private List<Map<String, Object>> bookInfos;
    }

在 map 列表中，键为“文本、电子邮件、日期等”。基于 key ，我想使用适当的验证约束进行验证电子邮件调用异常 javax.validation.constraints.Email.class来自验证 API。我不知道如何手动调用验证注释。

任何提示或帮助将不胜感激。

Answer 1

I am not sure how to manually invoke the validation annotations.

我正在回答上面引用的内容。 是，可以通过编程方式调用验证，如果验证失败，您将收到一组失败消息。以下是执行相同操作的步骤:

1. 构建ValidatorFactory
2. 从 ValidatorFactory 获取 Validator 实例
3. 使用 validate() 方法执行验证
4. 处理验证结果constraintViolations.iterator().next().getMessage()

显示一些代码，下面是上述所有四个步骤的代码片段:

ValidatorFactory factory = Validation.buildDefaultValidatorFactory();
Validator validator = factory.getValidator();
Set<ConstraintViolation<BookInfoView>> constraintViolations = validator.validate(bookInfoViewObj);
assertEquals( "Should not be empty", constraintViolations.iterator().next().getMessage() );

Hibernate Validator 框架提供了各种其他功能来验证一个或多个实体，然后处理结果。最好看看official document .