Bagaimana kita bisa menggunakan salah satu validasi di boot musim semi?

Anda perlu menulis anotasi khusus untuk ini dan digunakan di kelas

@AtLeastOneNotEmpty(fields = {"name", "phone"})
public class User{

Penerapan Anotasi Khusus

@Constraint(validatedBy = AtLeastOneNotEmptyValidator.class)
@Target({ElementType.TYPE})
@Retention(RetentionPolicy.RUNTIME)
public @interface AtLeastOneNotEmpty {

  String message() default "At least one cannot be null";

  String[] fields();

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

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

Dan Validator Anotasi Khusus

public class AtLeastOneNotEmptyValidator
    implements ConstraintValidator<AtLeastOneNotEmpty, Object> {

  private String[] fields;

  public void initialize(AtLeastOneNotEmpty constraintAnnotation) {
    this.fields = constraintAnnotation.fields();
  }

  public boolean isValid(Object value, ConstraintValidatorContext context) {

    List<String> fieldValues = new ArrayList<String>();

    for (String field : fields) {
      Object propertyValue = new BeanWrapperImpl(value).getPropertyValue(field);
      if (ObjectUtils.isEmpty(propertyValue)) {
        fieldValues.add(null);
      } else {
        fieldValues.add(propertyValue.toString());
      }
    }
    return fieldValues.stream().anyMatch(fieldValue -> fieldValue!= null);
  }
}