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The Configuration Files
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To begin building the application, first create a new Web module deployment descriptor (webxml) and a Faces configuration file (faces-configxml) file, both of which must reside in the web/WEB-INF directory The webxml file designates this directory structure as being a J2EE Web application Once finished, this directory structure will be universally deployable to any standard J2EE Web container/application server
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FIGURE 2-2 JSFReg application directory structure
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Building a Simple JavaServer Faces Application
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Here is the initial webxml file:
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< xml version = '10' encoding = 'windows-1252' > <web-app xmlns:xsi="http://wwww3org/2001/XMLSchema-instance" xsi:schemaLocation="http://javasuncom/xml/ns/j2ee http://javasuncom/xml/ns/j2ee/web-app_2_4xsd" version="24" xmlns="http://javasuncom/xml/ns/j2ee"> <description>Empty webxml file for a Web Application</description> <servlet> <servlet-name>Faces Servlet</servlet-name> <servlet-class>javaxfaceswebappFacesServlet</servlet-class> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>Faces Servlet</servlet-name> <url-pattern>/faces/*</url-pattern> </servlet-mapping> </web-app>
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PART I PART I PART I
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The key thing to notice is that the webxml file has a Faces servlet entry, javaxfaces webappFacesServlet, which serves as the Faces Controller servlet The Faces Controller servlet is able to intercept all Faces requests, providing they have the /faces/* pattern that matches the servlet mapping s url-pattern Actually the url-pattern can be set to anything, such as *faces or *jsf It simply has to be a pattern that allows the application to distinguish Faces requests from non-Faces requests All JSF-enabled pages must be accessed via a Faces request (using a suitable mapping pattern) so as to first invoke the Faces servlet Controller whose job is to prepare the JSF Context before routing to the requested page More coverage on the JSF lifecycle and Context will be provided in later chapters Next, add a faces-configxml file, which also resides in the WEB-INF subdirectory
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NOTE The faces-configxml file can actually be named anything and reside in any custom
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location (providing it s still accessible by the Web application) You can even have multiple faces configuration files The default directory location is the WEB-INF directory Non-default locations require an entry in the webxml designating the name and location of the faces configuration file (or files) An initial empty faces-configxml file will look like this:
< xml version="10" > <!DOCTYPE faces-config PUBLIC "-//Sun Microsystems, Inc//DTD JavaServer Faces Config 11//EN" "http://javasuncom/dtd/web-facesconfig_1_1dtd"> <faces-config xmlns="http://javasuncom/JSF/Configuration"> </faces-config>
JSF 12 TIP If you re building an application for Faces version 12, the faces-config file must be
specified using an XML schema, like this:
< xml version="10" > <faces-config xmlns=http://javasuncom/xml/ns/j2ee xmlns:xsi=http://wwww3org/2001/XMLSchema-instance xsi:schemaLocation="http://javasuncom/xml/ns/j2ee http://javasuncom/xml/ns/j2ee/web-facesconfig_1_2xsd" version="12"> </faces-config>
Part I:
The JavaServer Faces Framework
As you build the application, you ll be adding entries to the faces-configxml file including navigation rules and managed bean(s)
The JSP Pages
Let s start with the indexjsp page Typically, the indexjsp page is used as the starting page for JSP applications So to follow this convention we ll simply provide a JSP forward to automatically forward the user to the first Faces-enabled page, mainjsp, using the /faces/ url-pattern to initiate a Faces request:
<jsp:forward page="/faces/mainjsp" />
As the request is made, the Faces controller receives it and initiates the JSF lifecycle, which among other things will prepare the JSF Context and route the user to the JSF page, mainjsp As we ll review in later chapters, the JSF Context provides a simple and consistent way to access application data from JSF pages The mainjsp page, shown in Figure 2-3, is the first JSF-enabled page in the application It contains the single JSF UI component, HtmlCommandLink, which renders a simple HTML hyperlink linked to the registration page The purpose of this page is to show a very simple example of how to use the HTMLCommandLink component with a navigation rule Let s examine the source code of the first JSF-enabled JSP page:
<%@ page contentType="text/html"%> <%@ taglib uri="http://javasuncom/jsf/core" prefix="f"%> <%@ taglib uri="http://javasuncom/jsf/html" prefix="h"%> <f:view> <html> <head> <title>A Simple JavaServer Faces Registration Application</title> </head> <body> <h:form > <h2> JSF Registration App </h2> <h:commandLink action="register"> <h:outputText value="Click here to register"/> </h:commandLink> </h:form> </body> </html> </f:view>
The first thing to notice is the two taglib directives at the top of the page:
<%@ taglib uri="http://javasuncom/jsf/core" prefix="f"%> <%@ taglib uri="http://javasuncom/jsf/html" prefix="h"%>
These JSP directives allow the JSP page to use the JSF Core and HTML tag libraries that are provided in the JSF specification s Reference Implementation, which in turn allows the
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