Allow me to ask three more questions:
1. If I want to reset some specific text fields when
the JSP is re-displayed, do I code the PostForm.java
like this (please confirm):
code:
-----------------------------------------------------
import org.apache.struts.validator.DynaValidatorForm;
import org.apache.struts.action.ActionMapping;
import javax.servlet.http.HttpServletRequest;
public class PostForm extends DynaValidatorForm
{
public void reset(ActionMapping mapping,
HttpServletRequest request)
{
super.reset( mapping, request );
set( "receiver", new String("") );
set( "sender", new String("") );
}
public PostForm () {}
}
-------------------------------------------------------
2. if I want to reset all the text fields when the JSP
is re-displayed, do I code like this (please confirm):
code:
-------------------------------------------------------
import org.apache.struts.validator.DynaValidatorForm;
import org.apache.struts.action.ActionMapping;
import javax.servlet.http.HttpServletRequest;
public class PostForm extends DynaValidatorForm
{
public void reset(ActionMapping mapping,
HttpServletRequest request)
{
initialize( mapping );
}
public PostForm () {}
}
------------------------------------------------------
3. What is the difference between
code:
-------------------------------------------------------
<form-bean
name="postForm"
type="package.package.package.PostForm">
<form-property
name="receiver"
type="java.lang.String"/>
<form-property
name="sender"
type="java.lang.String"/>
</form-bean>
-------------------------------------------------------
AND
code:
------------------------------------------------------
<form-bean
name="postForm"
type="org.apache.struts.validator.DynaValidatorForm">
<form-property
name="receiver"
type="java.lang.String"/>
<form-property
name="sender"
type="java.lang.String"/>
</form-bean>
---------------------------------------------------
Thank you very much.
--- Joe Hertz <[EMAIL PROTECTED]> wrote:
> Not at all.
>
> First off, set(String, String) is predefined for
> you. You don't need to
> create any of that. In fact, what you will find in a
> DynaValidatorForm is
> that your form classes start to get very sparse.
> Here's really what it could
> look like.
>
>
> public class PostForm extends BaseDynaForm {
>
>
> public void reset(ActionMapping actionMapping,
> HttpServletRequest
> httpServletRequest) {
> // throw new UnsupportedOperationException("Method
> is not
> implemented");
> }
>
> public PostForm () {
> }
>
>
> }
>
> In your ActionForm itself, beanUtils would work
> something like this. All you
> need is to get the right formBean object.
>
> public ActionForward execute(ActionMapping
> mapping, ActionForm form,
> HttpServletRequest request, HttpServletResponse
> response) throws Exception {
>
> PostForm pForm = (PostForm) form;
>
> // other code you write here
>
> BeanUtils.copyProperties(yourBean, pForm);
>
> // etc
>
> Doing it yourself without beanUtils?
>
> Instead of calling getSender() and having a String
> returned, you call get
> ("sender") and it will return an Object (cast it
> yourself to whatever type
> the sender form property really is). I made a base
> form class with a
> getString method that calls get() and does the
> String cast for me to save the
> tediom.
>
> Making sense now?
>
> > -----Original Message-----
> > From: Caroline Jen [mailto:[EMAIL PROTECTED]
> > Sent: Sunday, January 04, 2004 2:46 AM
> > To: Struts Users Mailing List
> > Subject: RE: Please Help - ClassCastException
> >
> >
> > I am still confused...
> >
> > I have a jsp that provides text fields for user to
> > fill out information. All the information is
> passed
> > via HttpRequest and to be validated. And all the
> > properties in my PostForm are populated by the
> > information retrieved from those text fields.
> >
> > And my PostForm is of
> >
>
type="org.apache.struts.validator.DynaValidatorForm">
> >
> > Therefore, in my PostForm.java, I should do
> something
> > like this? I just do not think the following code
> is
> > correct.
> >
> >
>
======================================================
> > import
> org.apache.struts.validator.DynaValidatorForm;
> >
> > public class PostForm extends DynaValidatorForm {
> >
> > private String receiver;
> > private String sender;
> >
> > public void set(String receiver, String
> receiver);
> > public void set(String sender, String sender);
>
> > public String get(String receiver, String
> > receiver);
> > public String get(String sender, String
> sender);
> > }
> >
>
======================================================
> > And you are saying that in my action class, I
> should
> >
> > .......
> > import org.apache.struts.action.Action;
> > import org.apache.struts.action.ActionForward;
> > import org.apache.struts.action.ActionMapping;
> > import org.apache.struts.action.ActionForm;
> >
> > import org.apache.commons.beanutils.BeanUtils;
> > import javax.servlet.http.HttpServletRequest;
> > import javax.servlet.http.HttpServletResponse;
> >
> > import org.apache.artimus.message.PostForm;
> > import org.apache.artimus.message.PostBean;
> > import org.apache.artimus.message.ThreadBean;
> > import
> org.apache.artimus.message.utility.DateUtil;
> >
> > public final class StoreMessage extends Action
> > {
> > public ActionForward execute(ActionMapping
> mapping,
> > ActionForm form,
> > HttpServletRequest
> > request,
> >
> HttpServletResponse
> > response)
> > throws Exception
> > {
> >
> > int parentPostID;
> > int threadID;
> > String memberName = request.getRemoteUser();
> > Timestamp now =
> > DateUtil.getCurrentGMTTimestamp();
> > parentPostID = Integer.parseInt(
> > request.getParameter( "parent" ) );
> >
> > ActionForm postForm = ( ActionForm )form;
> >
> > ThreadHandler thandler = new
> ThreadHandler();
> >
> > ThreadBean threadBean = new ThreadBean();
> > BeanUtils.copyProperties( threadBean,
> postForm
> > );
> >
> > if (parentPostID == 0 ) // new topic
> > {
> > threadBean.setLastPostMemberName(
> memberName
> > );
> > threadBean.setThreadCreationDate( now );
> > .........
> > .........
> >
> > threadID = thandler.insertThread(
> threadBean
> > );
> >
> > }
> > .......
> > .......
> > }
> > }
> >
> > --- Joe Hertz <[EMAIL PROTECTED]> wrote:
> > > Well, first off:
> > >
> > > In your (dyna) form, you don't create setters
> and
> > > getters for the properties
> > > though. With DynaForms you would say
> > > set("myPropertyName", "myString")
> > > instead of calling
> setMyPropertyName("myString").
> > > This is the Dyna part of
> > > DynaForms. It's much less tedious IMHO.
> > >
> > > In your action, you absolutely want to cast the
> form
> > > to PostForm. Otherwise
> > > the form variable has no way to know properties
> are
> > > associated with it. So
> > > yes, once you cast it to PostForm calls to
> > > BeanUtils.copyProperties() can and
> > > will work properly.
> > >
> > > Hope this helps,
> > >
> > > -Joe
>
=== message truncated ===
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