Prerequisites

• your JasperReport should be ready (a compiled report, e.g. sample.jasper, should be available in your classpath)
• you should have written a customized JRAbstractBeanDataSource that will feed the report

If you have no idea what I'm talking about, you should first dig into JasperReports. JasperReports is a powerful open source Java reporting tool that has the ability to deliver rich content onto the screen, to the printer or into PDF, HTML, XLS, CSV and XML files but this how-to will not learn you how to develop these reports so check their site out. I'd also highly suggest to get the iReport designer.

Generating your report using jZeno

• To generate the report, you need to instantiate your datasource, create a Map with JasperReports parameters (if any) and call the static generateReport() method on the ReportManager. This method will stream the result to the client browser (in a new window). You should therefore call it in response to an event (e.g. user clicks 'print'-button).

...
TestDataSource dataSource = new TestDataSource(testObject);

Map parameters = new HashMap();
parameters.put("parameterName", parameter);

ReportManager.generateReport("/net/sf/jzeno/jasper/test.jasper",
                dataSource, parameters, ReportManager.PDF, "filenameWithoutExtension");
...
		

Documentation

Sourceforge

External links