Here's a quick and dirty idea...
If you have backwards compatibility issues, sometimes the easiest thing to
do is to manage this in the web server outside of the application. For
example, I run Apache with Tomcat on my production site. For these kind of
circumstances I'll set up mod_rewrite to redirect one URL to another. With
regular expressions you can do this for a whole class of URLs at once.
A key advantage is that with the [R] flag you can actually redirect the old
URL to the new so that if the user bookmarks the page they will bookmark the
new URL.
WILL
----- Original Message -----
From: "Withers John Z" <[EMAIL PROTECTED]>
To: "'Velocity Users List'" <[email protected]>
Sent: Wednesday, July 27, 2005 10:28 AM
Subject: RE: More help with VelocityViewServlet needed
I think you've put your finger on the crux of my issue. I don't really,
fully, understand how VelocityViewServlet determines which template to
display. At least, I didn't until a little while ago.
I've opted to recode my application to load templates from a directory
structure that looks a lot like an old-time HTML document tree. Each
servlet will have all of its templates stored in an directory with the
same
name as the tail of the servlet's URL. In each directory, the servlet's
default template is placed in the file index.vm (taking the place of the
traditional index.html).
I've over-ridden the getTemplate() method in VelocityViewServlet as
follows:
Public Template getTemplate(String name)
throws ResourceNotFoundException, ParseErrorException, Exception {
if (name.endsWith("/") || ! Name.endsWith(".vm")) {
name = name + "/index.vm";
}
return super.getTemplate(name);
}
This seems to do what I expect.
I did not note in my earlier message that I'm 'somewhat' constrained in
the
URL format for each servlet in the application as backward compatibility
to
earlier versions of the application is required.
Thanks to everyone for all their help.
John
John Withers
-----Original Message-----
From: Nathan Bubna [mailto:[EMAIL PROTECTED]
Sent: Wednesday, July 27, 2005 12:16 PM
To: Velocity Users List
Subject: Re: More help with VelocityViewServlet needed
it's not clear to me from your code snippets just how the servlet is
supposed to know which template to load and merge. how are you
telling the servlet what resource to load? did you override the
handleRequest(...) and/or getTemplate(...) methods? if so, what are
they doing?
On 7/27/05, Withers John Z <[EMAIL PROTECTED]> wrote:
Hello all.
I know I've asked for help before and I know I've already asked this
question before. I would, normally, search through the message archive,
but
my employer has seen fit to configure our firewall to 'block' that
site...
IMHO, its because the word 'mail' appears in the host name and we're not
supposed to visit any site that allows us to post 'webmail'.
I'm converting an existing web application that uses Velocity to use the
VelocityViewServlet. In the original application, I created a base class
that performed many of the the velocity-specific housekeeping functions
that
the various servlet in the application required. While this works well
enough, it doesn't support the concept of a toolbox and I think a toolbox
would be handy. Instead of reinventing the wheel (yet again), I'm trying
to
use VelocityViewServlet to replace the base class that I developed.
This is what my velocity.properties file looks like:
webapp.resource.loader.path = /WEB-INF/templates
velocimacro.library = Macros3.0.vm
This is what part of my web.xml file looks like. I've trimmed out most
of
the servlet definitions to save space:
<web-app>
<context-param>
<param-name>org.apache.velocity.properties</param-name>
<param-value>/WEB-INF/velocity.properties</param-value>
</context-param>
<!-- BrowseServlet extends VelocityViewServlet to manage a cookie and
to
place results in the context
based on the query part of the client's URL -->
<servlet>
<servlet-name>browse</servlet-name>
<servlet-class>BrowseServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>browse</servlet-name>
<url-pattern>/browse</url-pattern>
</servlet-mapping>
</web-app>
When the client attempts to access the URL
http://host.com/application/browse?name=x, a message with a
stack trace is displayed in the browser indicating that '/browse'
couldn't
be found in any resource loader. A single index.vm doesn't seem to be
appropriate as there are several several servlet components in the
'application' web-app. What am I missing? None of the examples provided
with the Velocity tools seems to address this situation.
Thanks!
John
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