如果存在另一个字段,我需要执行字段验证(它可以是值之一)。
import javax.validation.*;
class Person {
@NotBlank
private String name;
private Long groupId;
@Valid // if group id is not null, select one from available.
private String specialization;
// getters, setters.
}
class PersonValidaionLogic {
@Autowired
private SpecializationService specializationService;
public void validatePerson(final Person person) {
Long groupId = person.getGroupId();
if (groupId != null) {
Set<String> availableSpecializations = specializationService.getByGroupId(groupId);
if (!availableSpecializations.contains(specialization)) {
addValidationError("specialization is not valid");
}
}
}
}
有一个nice answer on how to validate multiple fields in a class with conditions on each other。
如何将specializationService
和groupId
传递给验证器。
随意分享您的解决方案或想法!这就是我解决这个问题的方法。
我在我的问题中使用了链接中的想法,但是更容易。
首先,我解决了问题how to pass a Spring component or service into validator。我使用了一个包含服务静态引用的组件。
其次,我验证了链接中描述的整个对象。
这是代码!
1)创建注释@PersonConstraint
并输入Person
类。这可能有助于https://www.baeldung.com/javax-validation-method-constraints
@Target({ TYPE })
@Retention(RUNTIME)
@Constraint(validatedBy = PersonValidator.class)
public @interface PersonConstraint {
String message() default "Specialization is not valid";
Class<?>[] groups() default { };
Class<? extends Payload>[] payload() default { };
CaseMode value();
}
2)保存服务静态引用的组件。
@Component // Spring component.
class ServiceHolderComponent {
private static SpecializationService SPECIALIZATION_SERVICE;
@Autowired
public ServiceHolderComponent(final SpecializationService specializationService) {
GROUP_SERVICE = Validate.notNull(groupService); //apache lib
}
public static SpecializationService getSpecializationService() {
return SPECIALIZATION_SERVICE;
}
}
3)和人验证员
public class PersonValidator implements ConstraintValidator<PersonConstraint, Person> {
private final SpecializationService specializationService;
public UserDynamicEnumValidator() {
this(ServiceHolderComponent.getSpecializationService());
}
public UserDynamicEnumValidator(final SpecializationService specializationService) {
this.specializationService = specializationService;
}
@Override
public boolean isValid(final Person person, final ConstraintValidatorContext context) {
final Long groupId = person.getGroupId();
if (groupId == null) {
return true; // We consider it valid.
}
final String specialization = person.getSpecializat();
if (StringUtils.isEmpty(specialization)) {
return true; // We consider it valid.
}
// I changed the code of the service, so it returns a set of strings - projection query and collectors to set.
final Set<String> availableSpecializationValuesByGroup = specializationService.findByValue(groupId);
if (!availableSpecializationValuesByGroup.contains(specialization)) {
// To display custom message
context.disableDefaultConstraintViolation();
context.buildConstraintViolationWithTemplate("Specialization is not valid").addConstraintViolation();
return false;
}
return true;
}
}
要显示custom message in validator,请检查此项