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Implementing an Excel View
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To get started creating an Excel view, you need to extend the abstract view base class. Listing 9-13 shows how to create an Excel view that fills a spreadsheet with match data retrieved from the model. Listing 9-13. A Sample Implementation of the AbstractJExcelView Class package com.apress.springbook.chapter09.web.view; import java.util.Map; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import jxl.write.WritableWorkbook; import jxl.write.WritableSheet; import jxl.write.Label; import org.springframework.web.servlet.view.document.AbstractJExcelView; public class MatchExcelView extends AbstractJExcelView { protected void buildExcelDocument(Map model, WritableWorkbook workbook, HttpServletRequest request, HttpServletResponse response) throws Exception { WritableSheet sheet = workbook.createSheet( "Sheet 1", workbook.getNumberOfSheets()); sheet.addCell(new Label(0, 0, "This is a sample label")); } } The example in Listing 9-13 uses the match data obtained from the model to add content to the provided Excel workbook. Note that the creation of the workbook and the writing of the contents to the view are handled by Spring.
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CHAPTER 9 VIEW TECHNOLOGIES
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Configuring Your Application to Use Excel
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To configure your web application to use the created Excel view, add the lines shown in Listing 9-14 to the previously created views.properties file (Listing 9-11). Listing 9-14. The views.properties Properties File Defining the Created Excel View # The match excel view matchExcelView.class=com.apress.springbook.chapter09.web.view.MatchExcelView A nice feature of the Excel view base classes is that they offer you the ability to use an existing Excel file as the template for your Excel views. This allows you to manually create or reuse an existing Excel file containing, for instance, all formulas and charts. In addition, you can have your view implementation insert only the necessary data. For example, to use an existing Excel document named sample.xls as the template for your Excel view, add the lines shown in Listing 9-15 to the views.properties file. Listing 9-15. The views.properties Properties File Defining the Excel View Template # The template to use for the match excel view matchExcelView.url=sample Note that Spring will load the existing Excel file and provide it as input to your Excel view implementation. The code inserting the data into the workbook will remain unchanged. Because Spring uses the ResourceBundle mechanism to load the existing Excel document, you could also include different Excel templates for different languages.
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The created Excel view will set the content type of the document appropriately. However, not all browsers respect this content type. You should therefore always use the .xls extension for your Excel views. Be sure to also map the extension to the Spring DispatcherServlet in your web.xml file.
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JasperReports
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JasperReports is a powerful, open source reporting tool that allows you to create rich reports in the form of HTML, XLS, PDF, and so on. Spring provides convenient support for using JasperReports to add report-generating capabilities to your web application. As with the PDF and Excel support described in the previous sections, Spring provides view implementations for JasperReports views, as listed in Table 9-3. Table 9-3. The JasperReports View Classes Provided by Spring
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JasperReportsCsvView JasperReportsHtmlView JasperReportsPdfView JasperReportsXlsView JasperReportsMultiFormatView
Description
Renders a report as comma-separated values (CSV) Renders a report in HTML Renders a report in PDF Renders a report as an Excel file Allows you to choose the rendering at runtime (demonstrated in Listing 9-16)
CHAPTER 9 VIEW TECHNOLOGIES
JasperReports reports need to be either configured in XML or designed using a graphical editor, such as OpenReports (http://oreports.com) or iReport (http://jasperforge.org/sf/projects/ ireport). These reports must also be compiled in order for them to be rendered by JasperReports. When using Spring s JasperReports view classes, you do not need to worry about this. Spring will make sure the report gets compiled if it has not been compiled already.
Implementing a JasperReports View
Listing 9-16 shows how to use JasperReports in your web application. It uses XmlViewResolver, which we introduced earlier. The view resolver looks up the specified view name in an external XML bean definition file. Of course, you do not necessarily need to use this view resolver to work with JasperReports; you can use any of the view resolvers we described earlier. First, you need to define the views you want to use in a separate XML file in this case, reports.xml. Listing 9-16 uses the JasperReportsMultiFormatView view implementation. This implementation can be used to choose the format for rendering the report at runtime. Listing 9-16. The reports.xml Views Declaration for the XML-Based View Resolver < xml version="1.0" encoding="UTF-8" > <!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd"> <beans> <bean id="report" class="org.springframework.web.servlet.view.jasperreports. JasperReportsMultiFormatView"/> </beans>
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