Struts——an open-source MVC implementation
By Christian Kirkegaard and Anders Moller,BRICS, University of Aarhus, Denmark
This article introduces Struts, a Model-View-Controller implementation that uses servlets
and JavaServer Pages (JSP) technology. Struts can help you control change in your Web project
and promote specialization. Even if you never implement a system with Struts, you may get
some ideas for your future servlets and JSP page implementation.
Introduction
Kids in grade school put HTML pages on the Internet. However, there is a monumental
difference between a grade school page and a professionally developed Web site. The page
designer (or HTML developer) must understand colors, the customer, product flow, page layout,
browser compatibility, image creation, JavaScript, and more. Putting a great looking site together
takes a lot of work, and most Java developers are more interested in creating a great looking
object interface than a user interface. JavaServer Pages (JSP) technology provides the glue
between the page designer and the Java developer.
If you have worked on a large-scale Web application, you understand the term change.
Model-View-Controller (MVC) is a design pattern put together to help control change. MVC
decouples interface from business logic and data. Struts is an MVC implementation that uses
Servlets 2.2 and JSP 1.1 tags, from the J2EE specifications, as part of the implementation. You
may never implement a system with Struts, but looking at Struts may give you some ideas on
your future Servlets and JSP implementations.
Model-View-Controller (MVC)
JSP tags solved only part of our problem. We still have issues with validation, flow control,
and updating the state of the application. This is where MVC comes to the rescue. MVC helps
resolve some of the issues with the single module approach by dividing the problem into three
categories:
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