November 2002
Intermediate to advanced
464 pages
14h 34m
English
Content preview from Programming Jakarta StrutsBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.
The Digester Component
When a Struts application is initialized, one of the first things that it must do is to read and parse the configuration file, which, as you’ve seen in this chapter, is in XML. The Digester component is a separate Jakarta project made up of several classes that read XML files and create and initialize Java objects based on those files.
The Digester component uses a set of rules, written as a Java class, to invoke callback methods. These methods instantiate and populate the objects with data read from the Struts configuration file.
The Struts framework uses the Digester to parse the configuration
files and to create the necessary configuration objects within the
org.apache.struts.config package. The rules that
the Digester uses for Struts are contained within the
org.apache.struts.config.ConfigRuleSet class.
There is little need to modify the ConfigRuleSet
class unless you need to extend the configuration file. If this is
necessary for your application, you should view the documentation for
the Digester component before you get started. This can be found at
http://jakarta.apache.org/commons/digester.html.
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.