The document discusses the Struts framework, an open-source Java framework for web application development that follows the MVC design pattern. It outlines the structure and components of Struts applications, detailing the roles of the controller, model, and view, as well as how to configure them using XML files. Additionally, it emphasizes the ease of development and maintenance provided by this architectural approach.

1. Struts

2. Agenda
 Preface
 Struts and its components
 An example
 The architecture required for
Struts Applications

3. Preface
Problem we faced when designing JSP:
 Familiar with HTML and expertise in web
design (the content, font, color, web page
layout etc.)
 Having Programming knowledge with Java
(embedded java code in JSP)

4. Break down the
tasks with Struts

5. What is
Struts
 Norwegian word meaning ostrich
 A Java open source framework
especially used for web application
development.
 With Struts, developers can following
the MVC design pattern to design
web application

6. What is MVC design pattern
 Input Processing Output
 Controller Model View
Calculation,
database
operation,
connection
with remote
systems
Application
screen, web
pages

7. Controller in Struts
 Called ActionServlet
 Its functions:
- Receive http request from client
(Web browser)
- Invoke Model part by calling
Action objects
- Send the JSP file returned by
Action objects back to the client

8. Model component in Struts
 In Action objects
 Its functions:
- Carrying out business related
processing (by itself or other objects)
- Determining the next web page to
send to the client

9. View component in Struts
 Html and JSP files with Struts tags
embedded
 Features provided by Struts tags:
- Sophisticated html form handling
(validation, error display etc.)
- Display localized messages
stored in a resource file on web
page (message tag)
- And many others …

10. How to get M V C parts work
together
 A configuration file called struts-
config.xml in XML format
 Defines Action classes, Java Beans used
in the project
 Define “virtual” paths to be used in JSP
files

11. An
example
In TestWeb1.jsp:
…<struts-html:form action=“action1”>…
In struts-config.xml:
… < action path=“action1”
type=“JavaBean1”…>…
<forward name=“next1"
path="/nextpage1.jsp"/>
 If changing to use another java
bean as Action class in the future,…

12. The whole process of a client
request
ActionServlet
Action object
JavaBean1
JSP / HTML
files
nextpage1.js
p
Call
“action1”
ActionForward
next1
Client
request
find

13. The architecture required for Struts Applications
Struts Applications
Struts classes / Taglib
Java Application Server
JSP / Servlet engine

14. Summary
 Breakdown web development into
MVC parts
 Easy to develop and maintain

15. Questions
?