Custom validation example - Spring MVC 4

To build a custom validation example you need to:

1-Create an Interface
2-Create a class that implements ConstraintValidator
3-Use the  custom validation in the Bean


 Step 1: 

@Documented
@Constraint(validatedBy=PhoneConstraintValidator.class)
@Target({ElementType.METHOD,ElementType.FIELD})
@Retention(RetentionPolicy.RUNTIME)
public @interface Phone {

    String message() default "{Phone}";
    Class<?>[] groups() default {};
    Class<? extends Payload>[] payload() default {};
}

Step 2:

public class PhoneConstraintValidator implements ConstraintValidator<Phone, String> {

    @Override
    public void initialize(Phone phone) {
       
     }

    @Override
    public boolean isValid(String phoneField, ConstraintValidatorContext cxt) {
        if (phoneField == null){
            return false;
        }
        return phoneField.matches("[0-9()-]*");
    }

}

Step 3: 

@NotEmpty @Phone
    private String phoneNumber;