Answer / tarun

The validation in struts is done by 2 ways. one is
programmatic validation and Declarative validation. I
programmatic validation we override the
validate(ActionMapping am, HttpServletRequest req) method
provided by ActionClass. This method returns the ActionErros.
For Example :

public ActionErrors validate(ActionMapping am,
HttpServletRequest req){
ActionErrors ae = new ActionErrors();
if(username==null ||
username.equals("")){ae.add("unameError", new
ActionMessage("uname.empty"));}

if(password==null || password.equals("")){
ae.add("passError", new ActionMessage("pass.empty"));
}else if(password.length()<5){
ae.add("passError", new ActionMessage("pass.minlength"));
}
return ae;
}
The values of pass.minlength , pass.empty, uname.empty will
be described in the properities file.

And in the case of declarative validation we extend the form
bean class from anyone of these classes DynaValidatorForm,
DynaValidatorActionForm

the first two classes are defined in
org.apache.struts.validator.*;
In this case we need validator.xml and validator-rules.xml
and properties file.

Answer / n.ramakrishna goud

We can create two types of validations
1).Manually
2).Automated
we can create manual validation by implementing the
validate method in ActionForm ,DynaActionForm,Validator
or DynaValidatorForm
Also ,
we can use the automated validation like
Integer,email,creditcard etc., by providing the validation
in the following xml files.,
validation.xml
validation_rules.xml

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