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How the JSP Runtime Loads TLD Files
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Like the faces-configxml files, any JSP tag library descriptor (TLD) files that reside in the META-INF directory of any JAR in WEB-INF/lib must be loaded by runtime In JSP this means the tags in the TLD are made available to the JSP pages in the application via the taglib URI given in the TLD Another useful mechanism is the ability to declare listener elements that cause any of the listeners defined by the servlet specification to be loaded and called at the appropriate time in the application s lifecycle Table 10-1 lists the Listeners provided by the servlet specification that can be declared in a TLD
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Part II:
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Extending JavaServer Faces
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Listener Name javaxservletServletRequestEvent javaxservlethttp HttpSessionListener javaxservlet ServletContextListener javaxservlet ServletRequestAttributeListener javaxservlet httpHttpSessionAttributeListener javaxservlet ServletContextAttributeListener
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TABLE 10-1
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Description Creates and destroys a ServletRequest Creates and destroys the HttpSession Creates and destroys the ServletContext Adds and removes on the attribute set of the ServletRequest Adds and removes on the attribute set of the HttpSession Adds and removes on the attribute set of the ServletContext
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Listeners That Can Be Declared in a TLD
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Component Classes
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Java classes must be packaged in the JAR just as normal at the top level Note that this is different than how classes are placed into a WAR file In the WAR file case, the classes go in WEB-INF/classes In a JSF component JAR, they must go at the normal top level as produced by the standard jar command
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Associated Resources
Any non-class resources associated with the components, such as images, stylesheets, and JavaScript files, may be placed anywhere in the JAR, because the responsibility for loading these resources is not covered in the JSF specification This lack of specificity has left a hole that may be filled in several ways The MyFaces implementation provides a Servlet Filter that must be installed to serve up the static images from the component WAR file 11 includes a PhaseListener that does exactly this, but for JavaScript files
A JSF Components Package Example: componentsjar
This section lists the three elements of a component library configuration files, Java classes, and associated static resources by showing how the componentsjar file is organized This library contains all the components from this chapter in one easy-to-use package
Configuration Files
The META-INF/faces-configxml file for componentsjar is as follows:
< xml version="10" encoding="windows-1252" > <!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"> <component>
10:
Building Custom UI Components
<component-type>HtmlHelloWorld</component-type> <component-class> comjsfcomprefcomponentscomponentHtmlHelloWorld </component-class> </component> <component> <component-type>HtmlHelloInput</component-type> <component-class> comjsfcomprefcomponentscomponentHtmlHelloInput </component-class> </component> <component> <component-type>HtmlStockInput</component-type> <component-class> comjsfcomprefcomponentscomponentHtmlStockInput </component-class> </component> <component> <component-type>InputDate</component-type> <component-class> comjsfcomprefcomponentscomponentInputDate </component-class> </component> <render-kit> <renderer> <component-family>InputDateFamily</component-family> <renderer-type>HtmlInputDateRenderer</renderer-type> <renderer-class> comjsfcomprefcomponentsrendererHtmlInputDateRenderer </renderer-class> </renderer> <renderer> <component-family>InputDateFamily</component-family> <renderer-type>WmlInputDateRenderer</renderer-type> <renderer-class> comjsfcomprefcomponentsrendererWmlInputDateRenderer </renderer-class> </renderer> </render-kit> <managed-bean> <managed-bean-name>ExampleUser</managed-bean-name> <managed-bean-class>comjsfcomprefexampleUser</managed-bean-class> <managed-bean-scope>request</managed-bean-scope> </managed-bean> <component> <component-type>SvgBarChart</component-type> <component-class> comjsfcomprefcomponentscomponentSVGBarChart </component-class> </component> <managed-bean> <managed-bean-name>ExampleChartData</managed-bean-name> <managed-bean-class>
PART II
Part II:
Extending JavaServer Faces
comjsfcomprefexampleChartData </managed-bean-class> <managed-bean-scope>request</managed-bean-scope> </managed-bean> <component> <component-type>SliderInput</component-type> <component-class> comjsfcomprefcomponentscomponentSliderInput </component-class> </component> <component> <component-type>SliderScript</component-type> <component-class> comjsfcomprefcomponentscomponentSliderScript </component-class> </component> <component> <component-type>HtmlHelloInputMB</component-type> <component-class> comjsfcomprefcomponentscomponentHtmlHelloInputMB </component-class> </component> <managed-bean> <managed-bean-name>ExampleMsgListener</managed-bean-name> <managed-bean-class> comjsfcomprefexampleMsgListener </managed-bean-class> <managed-bean-scope>request</managed-bean-scope> </managed-bean> </faces-config>
The META-INF/componentstld file for componentsjar is as follows:
< xml version = '10' encoding = 'windows-1252' > <taglib xmlns:xsi="http://wwww3org/2001/XMLSchema-instance" xsi:schemaLocation="http://javasuncom/xml/ns/j2ee http://javasuncom/xml/ns/j2ee/web-jsptaglibrary_2_0xsd" version="20" xmlns="http://javasuncom/xml/ns/j2ee"> <description> This is the JSP tag library for the custom components chapter </description> <display-name>components</display-name> <tlib-version>10</tlib-version> <short-name>components</short-name> <uri>http://jsfcomprefcom/demo/components</uri> <tag> <description>Hello World Tag</description> <name>helloworld</name> <tag-class> comjsfcomprefcomponentstaglibHtmlHelloWorldTag </tag-class> <body-content>empty</body-content> <attribute> <description>a custom hello message</description> <name>hellomsg</name>
10:
Building Custom UI Components
<required>false</required> <rtexprvalue>false</rtexprvalue> <type>javalangString</type> </attribute> <attribute> <name>id</name> <required>false</required> <rtexprvalue>false</rtexprvalue> </attribute> <attribute> <name>binding</name> <required>false</required> <rtexprvalue>false</rtexprvalue> </attribute> <attribute> <name>rendered</name> <required>false</required> <rtexprvalue>false</rtexprvalue> </attribute> </tag> <tag> <description>Hello World Input Tag</description> <name>helloinput</name> <tag-class> comjsfcomprefcomponentstaglibHtmlHelloInputTag </tag-class> <body-content>empty</body-content> <!-- attributes deleted for brevity --> </tag> <tag> <description>Stock Input Tag</description> <name>stockinput</name> <tag-class> comjsfcomprefcomponentstaglibHtmlStockInputTag </tag-class> <body-content>empty</body-content> <!-- attributes deleted for brevity --> </tag> <tag> <description>A simple HTML date picker</description> <name>inputdate</name> <tag-class> comjsfcomprefcomponentstaglibHtmlInputDateTag </tag-class> <body-content>JSP</body-content> <!-- attributes deleted for brevity --> </tag> <tag> <description> A simple WML date picker </description> <name>wmlinputdate</name> <tag-class> comjsfcomprefcomponentstaglibWmlInputDateTag </tag-class> <body-content>JSP</body-content>
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