hibernate - 电子邮件字符串集合的 JPA 验证

Question

我的 bean 中有一个 String 列表。这些字符串是电子邮件，我想验证它们。

@Email
@ElementCollection(fetch = FetchType.LAZY)
@OrderColumn
private List<String> emails = new ArrayList<String>();

在执行时，我收到此错误:

Caused by: javax.validation.UnexpectedTypeException: HV000030: No validator could be found for type: java.util.List<java.lang.String>.
    at org.hibernate.validator.internal.engine.constraintvalidation.ConstraintValidatorManager.verifyResolveWasUnique(ConstraintValidatorManager.java:218)
    at org.hibernate.validator.internal.engine.constraintvalidation.ConstraintValidatorManager.findMatchingValidatorClass(ConstraintValidatorManager.java:193)
    at org.hibernate.validator.internal.engine.constraintvalidation.ConstraintValidatorManager.getInitializedValidator(ConstraintValidatorManager.java:97)
    at org.hibernate.validator.internal.engine.constraintvalidation.ConstraintTree.validateConstraints(ConstraintTree.java:125)
    at org.hibernate.validator.internal.engine.constraintvalidation.ConstraintTree.validateComposingConstraints(ConstraintTree.java:233)
    at org.hibernate.validator.internal.engine.constraintvalidation.ConstraintTree.validateConstraints(ConstraintTree.java:102)
    at org.hibernate.validator.internal.engine.constraintvalidation.ConstraintTree.validateConstraints(ConstraintTree.java:91)
    at org.hibernate.validator.internal.metadata.core.MetaConstraint.validateConstraint(MetaConstraint.java:83)
    at org.hibernate.validator.internal.engine.ValidatorImpl.validateConstraint(ValidatorImpl.java:547)
    ...

这样做的正确方法是什么？或者有没有其他方法可以做到这一点？

Answer 1

@Email仅适用于String而不适用于List，但您可以创建自己的 validator :

@Target({ ElementType.FIELD, ElementType.PARAMETER })
@Retention(RetentionPolicy.RUNTIME)
@Constraint(validatedBy = EmailCollectionValidator.class)
@Documented
public @interface EmailCollection {
    String message() default "Invalid Email";

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

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

validator :

public class EmailCollectionValidator implements ConstraintValidator<EmailCollection, Collection<String>> {

    @Override
    public void initialize(EmailCollection constraintAnnotation) {

    }

    @Override
    public boolean isValid(Collection<String> value, ConstraintValidatorContext context) {
        if (value == null) {
            return false;
        }
        EmailValidator validator = new EmailValidator();
        for (String s : value) {            
            if (!validator.isValid(s, context)) {
                return false;
            }
        }
        return true;
    }
}

执行:

@EmailCollection
@ElementCollection(fetch = FetchType.LAZY)
@OrderColumn
private List<String> emails = new ArrayList<String>();