- ...
import javax.validation.Validation;
import javax.validation.Validator;
import javax.validation.ValidatorFactory;
import javax.validation.ConstraintViolation;
import java.util.Set;
public class User {
@NotNull
@Size(min = 3, max = 20)
private String username;
@NotNull
@Email
private String email;
public static void main(String[] args) {
User user = new User();
user.setUsername("admin");
user.setEmail("admin@example.com");
ValidatorFactory factory = Validation.buildDefaultValidatorFactory();
Validator validator = factory.getValidator();
Set<ConstraintViolation<User>> violations = validator.validate(user);
for (ConstraintViolation<User> violation : violations) {
System.out.println(violation.getPropertyPath() + ": " + violation.getMessage());
}
}
}
