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  Tutorial: Struts Controller UML diagrams

Struts 1.1 Controller UML diagrams

Tutorial Details:

Introduction
The goal of this article is to illustrate the Struts 1.1 Controller with UML diagrams. This article is an introduction to the Struts framework in order to help beginners programmers to understand the MVC model 2.

Contents :
Context description of the example with the struts-config.xml file
Struts 1.1 Controller Class Diagram of the org.apache.struts.action
Sequence Diagram
Links about Model View Controller model 2 pattern and the Struts implementation.
Use my diagrams - the license to respect if you want to use the code

Struts Controller
The ActionServlet class is the core of the framework. It is an HTTPServlet which receives requests from the browser and forwards it depending on a configuration file : struts-config.xml.
Since Struts 1.1, the processing logic has been delegated to the RequestProcessor class :
Method processMapping selects the ActionConfig used to process the selection path for this request.
Method processActionForm retrieves the ActionForm associated with a mapping or creates and stashes one if necessary.
Method processPopulate populates the properties of the specified ActionForm from the request parameters included with this request.
Method processValidate calls the validate() method of the specified ActionForm, and forwards back to the input form if there are any errors.
Method processActionPerform asks the specified Action instance to handle the request, returns an ActionForward
The subclasses of Action are created and used by RequestProcessor. It is a wrapper around Business logic. To use Action, subclass it and overwrite the execute() method.

Method execute processes the HTTP request, and creates the corresponding HTTP response. Returns an ActionForward instance describing where and how control should be forwarded.
Method saveErrors saves the specified error messages keys into the appropriate request


 

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