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You can make other familiar comparisons using the following operators as well: =, BETWEEN, and LIKE (using a % as a wildcard). As mentioned in the recipe, message selectors operate upon messages by examining the properties set in the message using its setStringProperty() method. If a property is not present in a message, the selector considers that a nonmatching message. To specify the message selector in the deployment XML, you must use the CDATA tag to avoid XML parsing errors due to the use of special characters like < or >.

easily to permit any range. The printf (formatted print) command in the body of the loop prints the current field, followed by a space. The last print statement outside the loop adds a final carriage return at the end of the output.

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.

Rather than handle errors in a message-driven bean, you want your beans to offload errors to an error-handling system.

echo $VAR | awk '{for(i=3; i<=NF; i++) {printf "%s ",$i}; print ""}'

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.

Handling errors across all your message-driven beans should be consistent and exact. By keeping the error-handling code in your message-driven beans, you open your beans to tedious changes if your error-handling strategy changes. If you must change the error-handling code in one bean, you might have to change it in all your message-driven beans. Passing exceptions to an error-handling object or

Here is the output:

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.

Instead of acting upon any errors, the message-driven bean catches any exceptions and forwards them on to an error-handling session bean. The messagedriven bean should be implemented as usual; the only new addition is the errorhandling mechanism (see listing 6.21).

Displaying a Range of Fields (Alternate Method)

Although you can deploy the design file as a .jrxml just as we re showing here, Jasper needs to Tip

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