我正在尝试使用自定义验证器来验证bean。但是,验证器需要从调用validate的方法传递给它的信息。有办法吗?
我无法在initialize中传递它,因为在创建bean时它不可用。
class vehicle {
@VehicleNameValidator
String vehicleName;
}
@Target({ElementType.FIELD})
@Retention(RUNTIME)
@Constraint(validatedBy = VehicleNameValidatorImpl.class)
@Documented
public @interface VehicleNameValidator {
String message() default "Invalid vehicle Name";
Class<?>[] groups() default { };
Class<? extends Payload>[] payload() default { };
}
public class VehicleNameValidatorImpl implements ConstraintValidator<VehicleNameValidator, String[]> {
@Override
public boolean isValid(String vehicleName, ConstraintValidatorContext constraintValidatorContext) {
boolean isValid = logicmethod()//some logic here
return isValid;
}
}
public static void main(String[] args) {
String whatIwantToPass = runtimelogic(args);
vehicle veh1 = new vehicle();
Set<ConstraintViolation<vehicle>> constraintViolations =
validator.validate(veh1);
}
如何将变量“ whatIwantToPass”从主方法传递给VehicleNameValidatorImpl。
答案 0 :(得分:0)
在ConstraintValidator
的实现中,您始终可以使用@Autowired或@Value批注。我相信您可以在VehicleNameValidatorImpl.class
public class VehicleNameValidatorImpl implements ConstraintValidator<VehicleNameValidator, String[]> {
@Autowired
LogicWrittenClass logicWrittenClass;
@Override
public boolean isValid(String[] roles, ConstraintValidatorContext constraintValidatorContext) {
String whatIwantToPass = logicWrittenClass.runtimelogic();
boolean isValid = logicmethod()//some logic here
return isValid;
}
}
但是请确保使用spring来创建验证器bean,否则,使用valdiation工厂(Hibernate Validator作为参考实现)手动创建验证器bean时,bean注入不会起作用,不会将依赖项注入ConstraintValidator实例中。
答案 1 :(得分:0)
如果使用的是Hibernate Validator,则可能需要查看约束验证器的有效负载。在您的情况下,它看起来像这样:
在验证器中,您可以访问有效负载:
public boolean isValid(String vehicleName, ConstraintValidatorContext constraintValidatorContext) {
boolean isValid = false;
if ( constraintValidatorContext instanceof HibernateConstraintValidatorContext ) {
final String payload = constraintValidatorContext
.unwrap( HibernateConstraintValidatorContext.class )
.getConstraintValidatorPayload( String.class );
// do whatever you need
isValid = logicmethod()//some logic here
}
return isValid;
}
可以在验证器工厂级别或每个验证器上设置有效负载,如下所示:
ValidatorFactory validatorFactory = Validation.byProvider( HibernateValidator.class )
.configure()
.buildValidatorFactory();
String whatIwantToPass = runtimelogic( args );
Validator validator = validatorFactory.unwrap( HibernateValidatorFactory.class )
.usingContext()
.constraintValidatorPayload( whatIwantToPass )
.getValidator();
// use the validator with the constraint validator payload
vehicle veh1 = new vehicle();
Set<ConstraintViolation<vehicle>> constraintViolations = validator.validate( veh1 );
有关更多详细信息,请参阅文档的此部分-Passing a payload to the constraint validator