Example - 1

In the following Java example the class RegistrationForm is a Struts framework ActionForm Bean that will maintain user information from a registration webpage for an online business site. The user will enter registration data and through the Struts framework the RegistrationForm bean will maintain the user data.

super();
// private variables for registration formprivate String name;private String email;...public RegistrationForm() {}// getter and setter methods for private variables...public class RegistrationForm extends org.apache.struts.action.ActionForm {}

However, the RegistrationForm class extends the Struts ActionForm class which does not allow the RegistrationForm class to use the Struts validator capabilities. When using the Struts framework to maintain user data in an ActionForm Bean, the class should always extend one of the validator classes, ValidatorForm, ValidatorActionForm, DynaValidatorForm or DynaValidatorActionForm. These validator classes provide default validation and the validate method for custom validation for the Bean object to use for validating input data. The following Java example shows the RegistrationForm class extending the ValidatorForm class and implementing the validate method for validating input data.

super();
// private variables for registration formprivate String name;private String email;...public RegistrationForm() {}public ActionErrors validate(ActionMapping mapping, HttpServletRequest request) {...}// getter and setter methods for private variables...public class RegistrationForm extends org.apache.struts.validator.ValidatorForm {}

Note that the ValidatorForm class itself extends the ActionForm class within the Struts framework API.