create pdf417 barcode in excel Figure 8-9. Excel template used to display flights in Font

Print PDF417 in Font Figure 8-9. Excel template used to display flights

Figure 8-9. Excel template used to display flights
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CHAPTER 8 SUPPORTED VIEW TYPES
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Listing 8-41 shows the class com.apress.expertspringmvc.flight.web.view.HomePageExcel, which extends AbstractExcelView. The required method that you need to override is called buildExcelDocument(). Listing 8-41. Creating the Excel Spreadsheet from the Model public class HomePageExcel extends AbstractExcelView { @Override protected void buildExcelDocument( Map model, HSSFWorkbook workbook, HttpServletRequest request, HttpServletResponse response) throws Exception { HSSFSheet dataSheet = workbook.getSheet("FlightSearch"); List<SpecialDeal> specials = (List<SpecialDeal>) model.get("specials"); int row = 4; for (SpecialDeal deal : specials) { int column = 0; getCell(dataSheet, row, ++column) .setCellValue(deal.getDepartFrom().getName()); getCell(dataSheet, row, ++column) .setCellValue(deal.getArriveAt().getName()); getCell(dataSheet, row, ++column) .setCellValue(deal.getCost()); row++; } } } This should all be starting to look quite familiar by now if you ve read the XSLT and PDF sections earlier in this chapter. The workbook is created for you by Spring and passed into this method as a parameter. You simply need to manipulate this object appropriately. In the preceding code, you can see that the model data is placed in particular cells of the spreadsheet in order to fit into the template. The getCell() method is a convenience method included with AbstractExcelView that just ensures the cell is available for you to set values on.
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Lastly, it just remains to configure the View for use. In our views.properties file we need two entries specifying the class name that we want to use and the URL pointing to the template we want to use. Listing 8-42 has the details. Listing 8-42. views.properties Configuration for Excel Home Page home.class=com.apress.expertspringmvc.flight.web.view.HomePageExcel home.url=/WEB-INF/excel/home When we hit the home page of our application now, the spreadsheet is created on the fly from a combination of the model and the template. Either your browser will ask what to do with it, or it will just fire up your spreadsheet application (Excel or OpenOffice.org, for example) to display the output. Figure 8-10 shows how it looks.
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Figure 8-10. Spreadsheet view of the home page
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JasperReports is an open-source reporting engine written in Java. Report designs are created in XML and can be output to several different formats. Jasper is a mature reporting engine now, and a commercial organization (JasperSoft) has recently been incepted to manage ongoing development and provide support. We re not going to show an example of the report itself because of the verbose syntax, but we encourage you to take a look at the samples on the Jasper site (http://jasperreports. sourceforge.net), which has excellent documentation online. In this section we ll concentrate on showing how to integrate the reports with your application.
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CHAPTER 8 SUPPORTED VIEW TYPES
Spring s Jasper support consists of five concrete View implementations for each of the final output types available. These were shown in Figure 7-1 in the previous chapter and are recapped here. JasperReportsCsvView JasperReportsHtmlView JasperReportsPdfView JasperReportsXlsView JasperReportsMultiFormatView The first four produce fixed format reports in CSV, HTML, PDF, and Excel format, respectively; the final one allows the format to be decided at runtime. A new, concrete type called ConfigurableJasperReportsView is likely to be available in Spring 1.3, which enables you to specify which JRExporter to use. To use one of the Jasper View types, you specify the familiar configuration in the ViewResolver s configuration file. Listing 8-43 shows an example that will display the home page model from our sample application as a Jasper PDF report. Listing 8-43. views.properties Settings for the Jasper Home Page home.class=org.springframework.web.servlet.view.jasperreports.JasperReportsPdfView home.url=/WEB-INF/jasper/home.jrxml The file home.jrxml is the report design itself. Jasper reports are natively XML, which is great if you need to get in and do low-level editing of a report, but coding one by hand can be quite laborious. A few GUI designers are available that will read and write Jasper s report design files, some of which are licensed commercially.
Although you can deploy the design file as a .jrxml just as we re showing here, Jasper needs to Tip
compile the report prior to use. Similar to JSPs, it will do this the first time it encounters a new report and then cache the resultant .jasper file. To do this, however, you need to make the jdt-compiler.jar available to your application and configure the JRCompiler accordingly. As such, it s recommended only for development environments. For production, you can precompile your reports using an Ant task provided with Jasper and deploy the compiled versions instead.
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