RE: Some further newbie woes

Thu, 06 May 2004 12:40:01 -0700

Nope, that didn't seem to make any difference. I get the same result, which is no output from the <nested:write> tag.

From: "Solley, Tim" <[EMAIL PROTECTED]>
Reply-To: "Struts Users Mailing List" <[EMAIL PROTECTED]>
To: "Struts Users Mailing List" <[EMAIL PROTECTED]>
Subject: RE: Some further newbie woes
Date: Thu, 6 May 2004 14:31:18 -0500

Hi None None...

So in your JSP you are iterating over an ArrayList of File objects, trying to get at a property inside the File objects. To get at nested objects, you use the Struts nested tag library.

Try replacing your <logic:iterate....> with the equivalent from the nested library: (below off the top of my head)

<nested:iterate id="drive" name="listDrivesForm" property="drives" type="java.io.File">
<nested:write name="drive" property="name"/>
</nested:iterate>

See if you have luck with that.



-----Original Message-----
From: None None [mailto:[EMAIL PROTECTED]
Sent: Thursday, May 06, 2004 2:16 PM
To: [EMAIL PROTECTED]
Subject: Some further newbie woes


Ok, I've banged my head enough in the past two hours...

I'm working on a file manager Struts app to get myself acquainted with
Struts.  The first logical step is a list of drives.  Here's what I've
done...

I have created an index.jsp that does a quick forward to main.jsp (just like
the blank struts app does). In main.jsp I have a simple link to
listDrives.ofm (using extension mapping in this app). Here's my
struts-config.xml file, minus comments, linebreaks and the XML & doctype
tags (to save space here)...

<struts-config>
    <form-beans>
      <form-bean name="listDrivesForm"
type="com.omnytex.ofm.actionforms.ListDrivesForm" />
    </form-beans>
    <global-forwards>
      <forward name="main" path="/main.ofm" />
    </global-forwards>
    <action-mappings>
      <action path="/main" type="org.apache.struts.actions.ForwardAction"
parameter="/jsp/main.jsp" />
      <action path="/listDrives"
type="com.omnytex.ofm.actions.ListDrivesAction" name="listDrivesForm"
scope="request" validate="false">
        <forward name="showDrivesList" path="/jsp/drivesList.jsp" />
      </action>
    </action-mappings>
</struts-config>

Simple enough.  So, I click my link and the following ActionForm is
instantiated in request scope:

package com.test.ofm.actionforms;
import org.apache.struts.action.*;
import java.io.*;
import java.util.*;
public class ListDrivesForm extends ActionForm {
  private ArrayList drives = null;
  public ListDrivesForm() {
    drives = null;
  }
  public void setDrives(File[] inDrives) {
    drives = new ArrayList();
    for (int i = 0; i < inDrives.length; i++) {
      drives.add(inDrives[i]);
    }
  }
  public ArrayList getDrives() {
    return drives;
  }
}

Also simple enough. Next, the following action executes:

package com.test.ofm.actions;
import org.apache.struts.action.*;
import java.io.*;
import javax.servlet.http.*;
import com.test.ofm.actionforms.*;
public class ListDrivesAction extends Action {
public ActionForward execute(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response) throws Exception {
File[] drives = File.listRoots();
ListDrivesForm ldf = (ListDrivesForm)form;
ldf.setDrives(drives);
return mapping.findForward("showDrivesList");
}
}

Now, to this point I am OK because if I do a simple println of
ldf.getDrives(), I in fact get a list of the drives on my system as
expected. So, I know my basic flow to this point is OK, and I know the code
in the action is doing what I expect. Lastly, I have the following JSP:

<%@ page language="java" import="java.io.*,com.omnytex.ofm.actionforms.*" %>
<%@ taglib uri="/WEB-INF/tld/struts-logic.tld" prefix="logic" %>
<%@ taglib uri="/WEB-INF/tld/struts-bean.tld" prefix="bean"%>
<html>
<head>
<title>File Manager</title>
</head>
<body>
File Manager
<br><hr><br>
<table border="1" cellpadding="0" cellspacing="0" width="100%">
<logic:iterate id="drive" name="listDrivesForm" property="drives">
<tr><td><bean:write name="drive" property="name" /></td></tr>
</logic:iterate>
</table>
</body>
</html>

This is where the problem arises... My table is being built, and the proper
number of rows are there, but I'm not seeing the drive letter being
displayed.  I have verified that my listDrivesForm is present and populated
by donig:

<%
  ListDrivesForm ldf =
(ListDrivesForm)request.getAttribute("listDrivesForm");
  System.out.println(ldf);
%>

Sure enough, I see my drive list. Now, I've been playing with various names
and ID combinations in the logic:iterate and bean:write tags, but nothing
seems to make it work. I've also tried in place of bean:write:

<tr><td><%=((File)drive).getName()%></td></tr>

From my reading I expected that to work just as well.  I've also tried
adding the scope attribute to the bean:write tag to no avail.

So, what am I doing wrong here? Do I need to do usebean here? Every
example I've seen of this never shows that, so I assume not. Also, why
didn't the code manually calling getName() above not work either? Even if I
needed useBean I would expect that to still work, which leads me to believe
I DON'T need useBean.

Any help is very much appreciated!

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