vb.net generate 2d barcode THE SPRING FRAMEWORK in Java

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CHAPTER 6 THE SPRING FRAMEWORK
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Listing 6-28. ListConferencesController Bean Definition <bean id="listConferencesController" class="com.integrallis.techconf.spring.web.ListConferencesController"> <property name="conferenceService"><ref bean="conferenceService"/></property> </bean>
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Creating a JSP View
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With the controller configured, we can turn our attention to the view. The first parameter on the constructor call for ModelAndView is the name of the view, which will be resolved by the framework s view resolver. Alternatively, the ModelAndView can also be constructed with a reference to a view object. The conferenceList view is represented by the conferenceList.jsp page shown in Listing 6-29. All JSP pages are stored in a directory named jsp under the WEB-INF Web application directory. Listing 6-29. JSP View conferenceList.jsp <%@ page contentType="text/html; charset=UTF-8" %> <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %> <p>Currently Available Conferences</p> <ul> <c:forEach var="conference" items="${conferences}"> <li> <a href="displayConference.htm id=${conference.conferenceId}"> ${conference.conferenceTitle} </a> </li> </c:forEach> </ul> In the conferenceList.jsp page we use core JSTL forEach tag to iterate over the list of ConferenceSummary DTOs (accessed as ${conferences}). For each object we are creating a link that points to the displayConference.html page, displays the conferenceTitle, and passes the conferenceId field as the parameter id.
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Using Tiles
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For the TechConf application we will configure the view resolution using the Tiles framework. In a typical website you ll have common elements to every page such as the header, footer, and navigation menu. Tiles is a framework that enables the usage of template layouts and reusability of common elements for JSP-based Web applications. Spring MVC integrates with the Tiles seamlessly. In Listing 6-30 shows the configuration elements in the application context needed to configure and use Tiles.
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CHAPTER 6 THE SPRING FRAMEWORK
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Listing 6-30. View Resolution Strategy Using Tiles <!-- =================================================================== --> <!-- View Resolution using Tiles --> <!-- =================================================================== --> <bean id="tilesConfigurer" class="org.springframework.web.servlet.view.tiles.TilesConfigurer"> <property name="definitions"> <list> <value>/WEB-INF/tiles-defs.xml</value> </list> </property> </bean> <bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name="viewClass"> <value>org.springframework.web.servlet.view.tiles.TilesView</value> </property> </bean> The tilesConfigurer bean backed by an instance of TilesConfigurer is used to configure objects representing one or more Tiles views. In Listing 6-30 we load a tiles definition contained in the file tiles-defs.xml, which is located in the WEB-INF directory of the Web application. Before we take a look a the tiles configuration, let s create a simple template in the form of a JSP. The simple template, template.jsp, is shown in Listing 6-31. Listing 6-31. A Simple Tiles JSP Template <%@ taglib uri="/WEB-INF/struts-tiles.tld" prefix="tiles" %> <html> <head> <title>TechConf - <tiles:getAsString name="pageTitle"/></title> <link rel="stylesheet" type="text/css" href="css/style.css"/> </head> <body> <h1><a href="index.html" style="color: #E9601A">TechConf</a></h1> <p id="titleblock" style="font-size: larger;"> <tiles:getAsString name="pageTitle"/> </p> <tiles:insert attribute="body"/> </body> </html>
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CHAPTER 6 THE SPRING FRAMEWORK
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As shown in Listing 6-31, a Tiles JSP uses Tiles tags to insert attributes into the template page. The tiles-defs.xml file shown in Listing 6-32 contains a single definition for the view conferenceList, which uses the template (template.jsp) as the frame for the page. Inside the definition element we define the value to be inserted for the property pageTitle and more importantly the value to be used for the body property defined in the template, which corresponds to the conferenceList.jsp page previously created. Listing 6-32. Tiles Definition File <!DOCTYPE tiles-definitions PUBLIC "-//Apache Software Foundation//DTD Tiles Configuration 1.1//EN" "http://jakarta.apache.org/struts/dtds/tiles-config_1_1.dtd"> <tiles-definitions> <definition name="conferenceList" page="/WEB-INF/jsp/template.jsp"> <put name="pageTitle" value="Conferences" /> <put name="body" value="/WEB-INF/jsp/conferenceList.jsp" /> </definition> ... </tiles-definitions> The second bean shown in Listing 6-30 is the viewResolver bean, which tells Spring MVC to use a TilesView, which is a view implementation corresponding to a Tiles definition. This resolution strategy takes the URL as the name of the Tiles definition. The viewResolver bean depends implicitly on the Tiles DefinitionsFactory object which was also implicitly created via the tilesConfigurer bean.
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Configuring the Web Deployment
Before we test the first page of the TechConf Spring application, we need to configure the Web deployment descriptor web.xml. This web.xml descriptor will be a little more involved than the previous one created for a simple introductory example. As mentioned previously and outlined in Figure 6-5, the Spring application context for the TechConf application has been modularized into three separate XML files, one per application tier. Listing 6-33 shows the Web deployment descriptor for the TechConf application. The contextConfigLocation property is the location of the Spring beans application context files. By default, Spring loads the application context techconf-servlet.xml ; therefore we only need to load the two remaining application contexts for the data and service tiers. Listing 6-33. Web Deployment Descriptor for TechConf Spring Application < xml version="1.0" encoding="ISO-8859-1" > <web-app xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee web-app_2_4.xsd" version="2.4">
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