Maven:
<dependency>
<groupId>org.hibernate.validator</groupId>
<artifactId>hibernate-validator</artifactId>
<version>6.1.0.Final</version>
</dependency>
Gradle:
groovy
implementation 'org.hibernate.validator:hibernate-validator:6.1.0.Final'
import javax.validation.ConstraintValidator;
import javax.validation.ConstraintValidatorContext;
public class AgeValidator implements ConstraintValidator<ValidAge, Integer> {
@Override
public void initialize(ValidAge constraintAnnotation) {
}
@Override
public boolean isValid(Integer age, ConstraintValidatorContext constraintValidatorContext) {
}
}
import javax.validation.Constraint;
import javax.validation.Payload;
import java.lang.annotation.*;
@Target({ElementType.FIELD, ElementType.METHOD})
@Retention(RetentionPolicy.RUNTIME)
@Constraint(validatedBy = AgeValidator.class)
public @interface ValidAge {
String message() default "Invalid age";
Class<?>[] groups() default {};
Class<? extends Payload>[] payload() default {};
}
import javax.validation.Validation;
import javax.validation.Validator;
import javax.validation.ValidatorFactory;
public class Main {
public static void main(String[] args) {
ValidatorFactory factory = Validation.buildDefaultValidatorFactory();
Validator validator = factory.getValidator();
User user = new User();
Set<ConstraintViolation<User>> violations = validator.validate(user);
if (!violations.isEmpty()) {
for (ConstraintViolation<User> violation : violations) {
System.out.println(violation.getMessage());
}
} else {
}
}
}
