how to get input from barcode reader in java After you run the command, a JSFRegwar file will be created and be ready for deployment in Java

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After you run the command, a JSFRegwar file will be created and be ready for deployment
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Part I:
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The JavaServer Faces Framework
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Deploying and Running the Application
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Once you have packaged your application, running it is as simple as placing the Web Archive file into Tomcat s webapps directory and then starting up Tomcat By default, Tomcat starts up on port 8080, thus the server can be accessed at http://localhost:8080/ To access the JSFReg application, point your browser to http://localhost:8080/JSFReg/ You ll notice that the name of your Web Archive file is used for the URL of your application Because you packaged the application in a file called JSFRegwar, /JSFReg/ is used in the application s URL When you first access the http://localhost:8080/JSFReg/ URL, indexjsp will be run, and it will automatically forward to the JSF-enabled page at /faces/mainjsp At this point you can click on the link to proceed to the registration page
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Reviewing the Key Portions of the Application
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Before moving on to the more advanced features of JavaServer Faces technology, let s quickly review the core areas of JavaServer Faces discussed in the process of building the JSFReg application A JSF application is essentially a standard J2EE Web application but with the following specific aspects: A specific configuration in the webxml that specifies the Faces Controller servlet and its url-pattern A faces-configxml configuration file for storing navigation rules, and references to managed beans and other JSF components A set of required runtime libraries (jar files) that must be in the classpath upon compilation and placed in the Web application s WEB-INF\lib directory for deployment to J2EE application servers In building this example application you have seen that basic JSF development is a straightforward process, which typically involves: Building java classes and adding them as JSF managed beans Creating JSP pages to contain JSF UI component tags that are bound to the managed bean s properties and methods Defining a set of navigation rules The JSFReg example used the Standard HTML UI components provided in the JSF Reference Implementation to build a registration form with different types of input fields, menus, and buttons that were bound to a managed bean s properties and methods For JSFReg we specified both built-in validation and data conversion for the input fields A custom validation method was also built and associated with an e-mail input field to validate an e-mail address Finally, we devised a basic navigation model and bound the command buttons and links to these navigation cases Now that you have seen a complete, working example, you should have a solid understanding of the basic structure of a JSF application It s now time to move on to more advanced aspects of JavaServer Faces
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CHAPTER
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The JavaServer Faces Request Processing Lifecycle
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he preceding chapter presented a simple example of a JavaServer Faces application and introduced many of the practical aspects of JSF However, there is one key aspect of JSF that will prove invaluable in progressing to more advanced JSF development: the request processing lifecycle The request processing lifecycle serves as the behind-thescenes engine that makes JavaServer Faces possible This chapter examines the key concepts behind the JavaServer Faces request processing lifecycle and explains how it processes Web requests in a well-defined, event-based manner A thorough understanding of the request processing lifecycle is important because its various phases will be referred to numerous times in later chapters where more advanced JSF development topics are covered
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A High-Level Overview of the JSF Request Processing Lifecycle
Historically, the bulk of the development required for a Web application has been devoted to processing HTTP requests from Web clients As the Web transformed from a traditional, static document delivery model in which static Web pages were simply requested without parameters to a dynamic environment with Web applications processing numerous incoming parameters, the need to process increasingly complex requests has grown substantially This has resulted in Web application development becoming rather tedious For example, consider the following code used in either a Java servlet or a JSP scriptlet to process the incoming request parameters firstname and lastname:
String firstname = requestgetParameter("firstname"); String lastname = requestgetParameter("lastname"); // Do something with firstname and lastname
Now, consider that most advanced Web applications today process hundreds if not thousands of parameters and you ll see how this approach to processing parameters can easily become quite cumbersome
Part I:
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