有没有办法使用定义的注释定义 Hibernate 验证规则 这里,说明至少有一个字段不能为空?
Is there a way to define a Hibernate validation rule using annotations as defined here, stating that at least one field shall be not null?
这将是一个假设示例(@OneFieldMustBeNotNullConstraint
并不真正存在):
This would be a hypothetical example (@OneFieldMustBeNotNullConstraint
does not really exist):
@Entity
@OneFieldMustBeNotNullConstraint(list={fieldA,fieldB})
public class Card {
@Id
@GeneratedValue
private Integer card_id;
@Column(nullable = true)
private Long fieldA;
@Column(nullable = true)
private Long fieldB;
}
在图示的情况下,fieldA 可以为 null 或 fieldB 可以为 null,但不能同时为 null.
In the illustrated case, fieldA can be null or fieldB can be null, but not both.
一种方法是创建我自己的验证器,但如果它已经存在,我想避免.如果您已经制作了一个验证器,请分享一个...谢谢!
One way would be to create my own validator, but I'd like to avoid if it already exists. Please share one validator if you have one already made... thanks!
我终于写出了整个验证器:
I finally wrote the whole validator:
import static java.lang.annotation.ElementType.TYPE;
import static java.lang.annotation.RetentionPolicy.RUNTIME;
import java.lang.annotation.Documented;
import java.lang.annotation.Retention;
import java.lang.annotation.Target;
import javax.validation.Constraint;
import javax.validation.ConstraintValidator;
import javax.validation.ConstraintValidatorContext;
import javax.validation.Payload;
import org.apache.commons.beanutils.PropertyUtils;
@Target( { TYPE })
@Retention(RUNTIME)
@Constraint(validatedBy = CheckAtLeastOneNotNull.CheckAtLeastOneNotNullValidator.class)
@Documented
public @interface CheckAtLeastOneNotNull {
String message() default "{com.xxx.constraints.checkatleastnotnull}";
Class<?>[] groups() default {};
Class<? extends Payload>[] payload() default {};
String[] fieldNames();
public static class CheckAtLeastOneNotNullValidator implements ConstraintValidator<CheckAtLeastOneNotNull, Object> {
private String[] fieldNames;
public void initialize(CheckAtLeastOneNotNull constraintAnnotation) {
this.fieldNames = constraintAnnotation.fieldNames();
}
public boolean isValid(Object object, ConstraintValidatorContext constraintContext) {
if (object == null) {
return true;
}
try {
for (String fieldName:fieldNames){
Object property = PropertyUtils.getProperty(object, fieldName);
if (property != null) return true;
}
return false;
} catch (Exception e) {
return false;
}
}
}
}
使用示例:
@Entity
@CheckAtLeastOneNotNull(fieldNames={"fieldA","fieldB"})
public class Reward {
@Id
@GeneratedValue
private Integer id;
private Integer fieldA;
private Integer fieldB;
[...] // accessors, other fields, etc.
}
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