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 triedadding 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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