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Extra info for Jakarta Struts For Dummies

Example text

For example, if you’re writing a purchasing system, part of the business data might be an entity called a Purchase Order. You may encapsulate this data into a class called PurchaseOrder as a way of representing the Purchase Order entity. Furthermore, you may choose to place your business rules directly into this class, or you may choose to put the rules into a different class. The connection between the Controller and Model rests in the code that you write in the Action subclasses. The Action subclasses contain the analysis of the user’s request that determines the interaction (if any) with the Model.

You can find tools out there for every taste and budget. org). Although Eclipse is definitely not for the minimalists, it’s not bloated with tons of features you never use. Eclipse has all the necessities you might want in a development environment, including a great editor, compiler, and debugger. Support for building and deploying applications is built-in with the Ant program. Ant is a Java-based build tool that makes building and deploying applications a one-step process. org. Like Struts, Ant is an Apache open-source project.

19 20 Part I: Getting to Know Jakarta Struts The Struts Controller Although Struts does not provide or require any particular Model or View components of the MVC pattern, it does implement the Controller as well as the mechanisms that bind the three layers and allow them to communicate with each other. The primary controller class is a Java Servlet called the ActionServlet. This class handles all user requests for Struts-managed URLs. Using information in the configuration files, the ActionServlet class then gets the appropriate RequestProcessor class that collects the data that is part of the request and puts it into an ActionForm, a Bean that con­ tains the data sent from or to the user’s form.

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