How To Practise A Custom Edible Bean Validation Inwards Javaee6

Bean validation has been mentioned on many articles online but I establish few that explicate the actual shape that implements the constraint validator. For example: the edible bean validation article from  oracle javaee6 documentation: http://docs.oracle.com/javaee/6/tutorial/doc/gkfgx.html.

If yous endeavour to annotated your edible bean plain with @Email, nada volition conduct house :-)

I'll simply write the virtually of import business office of the code, together with therefore I assume yous already bring a javaee6 spider web projection created. I advise yous create that past times using jboss javaee6 archetype.

For event nosotros desire a custom e-mail validator, nosotros volition ask at to the lowest degree four classes: bean, entity, @interface together with the validator implementation. So let's get-go amongst the entity class, let's say nosotros bring  a User:

@Entity @Table world shape User implements Serializeable {  @Email  someone String email; } 

As yous tin see, nosotros annotated the e-mail plain amongst @Email annotation. After that let's define the Email annotation:

import java.lang.annotation.Documented; import java.lang.annotation.ElementType; import java.lang.annotation.Retention; import java.lang.annotation.RetentionPolicy; import java.lang.annotation.Target;  import javax.validation.Constraint; import javax.validation.Payload;  @Documented @Target({ ElementType.METHOD, ElementType.FIELD, ElementType.ANNOTATION_TYPE,   ElementType.CONSTRUCTOR, ElementType.PARAMETER }) @Retention(RetentionPolicy.RUNTIME) world @interface Email {   String message() default "message.validation.invalidEmail";   Class[] groups() default {};   Class[] payload() default {};   String regexp() default "([^.@]+)(\\.[^.@]+)*@([^.@]+\\.)+([^.@]+)";  } 

This object contains the variables needed past times a ConstraintValidator such equally message, group, etc. And move the implementation class:

import javax.mail.internet.AddressException; import javax.mail.internet.InternetAddress; import javax.validation.ConstraintValidator; import javax.validation.ConstraintValidatorContext;  world shape EmailValidator implements ConstraintValidator<Email, String> {   @Override  world void initialize(Email constraintAnnotation) {   }   @Override  world boolean isValid(String value, ConstraintValidatorContext context) {   endeavour {    novel InternetAddress(value).validate();   } choose grip of (AddressException e) {    provide false;   }   provide true;  }  } 

This shape validates if a given value is e-mail using the InternetAddress class. The EmailValidator implements ConstraintValidator amongst type parameters <interface, value>.

Note that yous tin initialize plain inward initialize() method, together with therefore after yous tin role these fields inward isValid().

And that's it nosotros straightaway bring a custom e-mail validator. Just a reminder, inward unopen to of the shape similar the ones defined inward hibernate yous volition honour that the interface contains: @Constraint(validatedBy = { }), simply withdraw these property. This holding specify which validator to use, without value it volition non validate. Or yous tin specify the validator amongst this property: @Constraint(validatedBy = { EmailValidator.class })