How to download Subreport resources using Jasper?

Question

With Jasper, I use resources to download a report. So, to load the main report, I use something like:

InputStream is = getClass().getResourceAsStream("/resources/report1.jrxml");
design = JRXmlLoader.load(is);

But if report1.jrxml has a subreport, how can I say that it is in / resources / sub.jrxml?

Answer 1

I did it as follows:

jasperDesign = JRXmlLoader.load(rootpath + "/WEB-INF/templates/Report.jrxml");
jasperDesignSR = JRXmlLoader.load(rootpath + "/WEB-INF/templates/SubReport.jrxml");


JasperReport jasperReport = JasperCompileManager.compileReport(jasperDesign);
JasperReport jasperReportSR = JasperCompileManager.compileReport(jasperDesignSR);

parameters.put("SubReportParam", jasperReportSR);
JasperPrint jasperPrint = JasperFillManager.fillReport(jasperReport, parameters, dataSource);

"SubReportParam" will be a parameter of type "JasperReport" as the expression SubreportExpression in your report.

In .jrxml:

<parameter name="SubReportParam" class="net.sf.jasperreports.engine.JasperReport" isForPrompting="false"/>

I do not know if you use IReport for your reporting project. By right-clicking on your report, you should find SubreportExpression. Parameters is the map that I am switching to "fillReport"

Good luck.

Answer 2

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, Jasper , - , (, RepositoryService , , ), :

private static void fillReport() throws IOException, JRException {
    // The master report can be loaded just like that, because the
    // subreports will not be loaded at this point, but later when
    // report is filled.
    final JasperReport report = loadReport("masterReport.jasper");

    // The SimpleJasperReportsContext allows us to easily specify some
    // own extensions that can be injected into the fill manager. This
    // class will also delegate to the DefaultJasperReportsContext and
    // combine results. Thus all the default extensions will still be available
    SimpleJasperReportsContext jasperReportsContext = new SimpleJasperReportsContext();
    jasperReportsContext.setExtensions(
        RepositoryService.class, singletonList(new SubReportFindingRepository())
    );

    final byte[] pdf = JasperExportManager.exportReportToPdf(
        JasperFillManager
            .getInstance(jasperReportsContext)
            // carefully select the correct `fill` method here and don't
            // accidentally select one of the static ones!:
            .fill(report, YOUR_PARAMS, YOUR_CONNECTION)
    );
}

private static JasperReport loadReport(final String fileName) throws IOException, JRException {
    try(InputStream in = loadReportAsStream(fileName)) {
        return (JasperReport) JRLoader.loadObject(in);
    }
}

private static InputStream loadReportAsStream(final String fileName) {
    final String resourceName = "/package/path/to/reports/" + fileName;
    final InputStream report = CurrentClass.class.getResourceAsStream(resourceName);
    if (report == null) {
        throw new RuntimeException("Report not found: " + resourceName);
    }
    return report;
}

private static class SubReportFindingRepository implements RepositoryService {


    @Override
    public Resource getResource(final String uri) {
        return null; // Means "not found". The next RepositoryService will be tried
    }

    @Override
    public void saveResource(final String uri, final Resource resource) {
        throw new UnsupportedOperationException();
    }

    @Override
    public <K extends Resource> K getResource(final String uri, final Class<K> resourceType) {
        if (!isKnownSubReport(uri)) {
            return null; // Means "not found". The next RepositoryService will be tried
        }

        final ReportResource reportResource = new ReportResource();
        try {
            reportResource.setReport(loadReport(uri));
        } catch (IOException | JRException e) {
            throw new Error(e);
        }
        return resourceType.cast(reportResource);
    }

    private static boolean isKnownSubReport(final String uri) {
        return "subReport1.jasper".equals(uri) || "subReport2.jasper".equals(uri);
    }
}

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