Re: [Struts] chaining

From: Sudsy (bitbucket44_at_hotmail.com)
Date: 11/19/03 

Date: Wed, 19 Nov 2003 17:16:04 -0500

virtual wrote:
>>Check out the DTD for the struts-config.xml file. Pay particular
>>attention to the scope attribute of the action tag. You probably
>>want to specify scope="session".
>>HTH
>
>
> Of course I had known this idea but it is not what I need.
> I don't want to keep it in session.
>
>

Well, there is another way but you've got to be "vewwy, vewwy
careful" as Elmer Fudd would say. It can bite you if you don't
manage your forwards properly.
Suppose I have the following in my struts-config.xml:

   <form-beans>
     <form-bean
       name="EntryForm"
       type="com.myorg.EntryForm" />
   </form-beans>
   <action-mappings>
     <action
       path="/entry"
       type="com.myorg.EntryAction"
       name="EntryForm"
       scope="request"
       unknown="false"
       validate="false">
       <forward
         name="edit"
         path="/WEB-INF/jsp/edit.jsp"
         redirect="false" />
       <forward
         name="confirm"
         path="/WEB-INF/jsp/confirm.jsp"
         redirect="false" />
     </action>
   </action-mappings>

And suppose the page which is used for the initial data entry
looks like this:

<head>
<title>Data Entry Form</title>
</head>
<body>
<form action="/context/entry.do" method="POST">
<table>
<tr>
<th align="RIGHT">Enter a string</th>
<td align="LEFT"><input type="text" maxlength="30" size="30"
name="astring"/></td>
</tr>
<tr>
<td><input type="submit" name="command" value="Edit"/></td>
<td><input type="submit" name="command" value="Confirm"/></td>
</tr>
</table>
</form>
</body>

I'm also assuming that you've got the correct accessor and mutator
methods in EntryForm.
The EntryAction is very simple:

package com.myorg;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;

        public ActionForward execute(
                ActionMapping mapping,
                ActionForm actionForm,
                HttpServletRequest req,
                HttpServletResponse resp )
                throws Exception {
                        EntryForm form = (EntryForm) actionForm;
                        String cmd = form.getCommand();
                        if( cmd.equalsIgnoreCase( "edit" ) )
                                return( mapping.findForward( "edit" ) );
                        return( mapping.findForward( "confirm" ) );
        }
}

Now here's where we apply the magic! Here's the confirm.jsp page:

<%@ taglib uri="html" prefix="html" %>
<head>
<title>Data Confirmation Form</title>
</head>
<body>
<form action="/context/confirm.do" method="POST">
<table>
<tr>
<th align="RIGHT">String</th>
<td align="LEFT"><html:text maxlength="30" size="30" property="astring"
name="EntryForm" readonly="true"/></td>
</tr>
<tr>
<td><html:submit property="command" value="Edit"/></td>
<td><html:submit property="command" value="Confirm"/></td>
</tr>
</table>
</form>
</body>

Two things worth noting:
- the readonly="true" is set (as per your outline)
- we specify name="EntryForm"
Since EntryForm is the name specified in the action (and the
form-bean of course), and we're still in request scope, we
can use that bean to populate the text field.
We can even re-use the same form for the confirm action:

     <action
       path="/confirm"
       type="com.myorg.ConfirmAction"
       name="TestForm"
       scope="request"
       unknown="false"
       validate="false">
       <forward
         name="edit"
         path="/WEB-INF/jsp/edit.jsp"
         redirect="false" />
       <forward
         name="continue"
         path="/WEB-INF/jsp/confirmed.jsp"
         redirect="false" />

The edit.jsp page is almost identical to confirm.jsp except
without the readonly attribute. The confirmation page
(confirmed.jsp) is only slightly different as it uses a bean
tag:

<%@ taglib uri="bean" prefix="bean" %>
<head>
<title>Confirmation Page</title>
</head>
<body>
<table>
<tr>
<th align="RIGHT">Entered string:</th>
<td align="LEFT"><bean:write name="EntryForm" property="astring"/></td>
</tr>
</table>
</body>

Is this more up your alley?

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