Hello, everybody,
I do not understand the XSP upload example. Yes, it works fine, but I would
like to understand as much as possible. I guess their is some "magic" behind
the scene.
I did some reading of the API Javadoc, but I'am still not experienced enough
reading source code. What to do? Should I give up learning Cocoon :-(
The example XSP-Source follows. I added comments about what I don't
understand.
<?xml version="1.0" encoding="ISO-8859-1"?>
<!-- CVS: $Id: upload.xsp,v 1.3 2002/02/09 06:21:57 vgritsenko Exp $ -->
<!--
QUESTION: the namespace declarations for request, response and log are
not used and could be omitted? Is this correct?
-->
<xsp:page language="java"
xmlns:xsp="http://apache.org/xsp";
xmlns:xsp-request="http://apache.org/xsp/request/2.0";
xmlns:xsp-response="http://apache.org/xsp/response/2.0";
xmlns:log="http://apache.org/xsp/log/2.0";>
<xsp:structure>
<!--
QUESTION: Same with the XSPUtil import. Am I right?
-->
<xsp:include>org.apache.cocoon.components.language.markup.xsp.XSPUtil</xsp:i
nclude>
<xsp:include>org.apache.avalon.framework.context.ContextException</xsp:inclu
de>
</xsp:structure>
<!--
QUESTIONS: I do not understand this part. Who calls conceptualize?
Where does context
(org.apache.cocoon.generation.ServletGenerator.context?)
come from? And the get method of context? Their must be some "build in"
upload
functionality, please explain if You are patient enough.
-->
<xsp:logic>
File uploadDir = null;
/** Contextualize this class */
public void contextualize(Context context) throws ContextException {
uploadDir = (File) context.get(Constants.CONTEXT_UPLOAD_DIR);
}
</xsp:logic>
<page>
<title>This form allows you upload files</title>
<content>
<para>
<form method="post" enctype="multipart/form-data"
action="upload.xsp">
File: <input type="file" name="uploaded_file" size="50" />
<p><input type="submit" value="Upload File" /></p>
</form>
</para>
<para>
<ul>
<xsp:logic>
getLogger().debug("Dir=" + uploadDir);
String[] filelist = uploadDir.list();
<![CDATA[
getLogger().debug("List=" + filelist.length);
for (int i = 0; i < filelist.length; i++) {
getLogger().debug("File [" + i + "]=" + filelist[i]);
]]>
<li>
<xsp:expr>filelist[i]</xsp:expr>
</li>
<![CDATA[
}
]]>
</xsp:logic>
</ul>
</para>
<para>Brought to you by Cocoon at <xsp:expr>new
Date()</xsp:expr>.</para>
</content>
</page>
</xsp:page>
Thank You.
Regards
Stefan
--
Stefan Riegel
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