Export JasperReport to PDF OutputStream?

问题:

I'm writing a pretty simple sample project for familiarizing myself with Jasper Reports. I'd like to export a report I've configured to a PDF OutputStream, but there's no factory method for it:

InputStream template = JasperReportsApplication.class
    .getResourceAsStream("/sampleReport.xml");
JasperReport report = JasperCompileManager.compileReport(template);
JasperFillManager.fillReport(report, new HashMap<String, String>());
// nope, just chuck testa.  
//JasperExportManager.exportReportToPdfStream(report, new FileOutputStream(new File("/tmp/out.pdf")));

How can I get the PDF in an OutputStream?

回答1:

Ok, so here's how it works; JasperFillManager actually returns a JasperPrint object, so:

// get the JRXML template as a stream
InputStream template = JasperReportsApplication.class
    .getResourceAsStream("/sampleReport.xml");
// compile the report from the stream
JasperReport report = JasperCompileManager.compileReport(template);
// fill out the report into a print object, ready for export. 
JasperPrint print = JasperFillManager.fillReport(report, new HashMap<String, String>());
// export it!
File pdf = File.createTempFile("output.", ".pdf");
JasperExportManager.exportReportToPdfStream(print, new FileOutputStream(pdf));

Enjoy.

回答2:

You can use a JRExporter to export the filled report to different streams and formats.

JRExporter exporter = null;

exporter = new JRPdfExporter();
exporter.setParameter(JRExporterParameter.JASPER_PRINT, jasperPrint);
exporter.setParameter(JRExporterParameter.OUTPUT_STREAM, outputStream);
exporter.exportReport();

Also note that there are other exporters:

exporter = new JRRtfExporter();
exporter = new JRHtmlExporter();

You can find more exporters available here: http://jasperreports.sourceforge.net/api/net/sf/jasperreports/engine/JRExporter.html

They should all accept an OUTPUT_STREAM parameter to control the destination of the report.

回答3:

JRExporterParameter is deprecated in latest versions, This is a non deprecated solution of @stevemac answer

JRPdfExporter exporter = new JRPdfExporter();
exporter.setExporterInput(new SimpleExporterInput(jasperPrint));
exporter.setExporterOutput(new SimpleOutputStreamExporterOutput(outputStream));
SimplePdfExporterConfiguration configuration = new SimplePdfExporterConfiguration();
configuration.setMetadataAuthor("Petter");  //why not set some config as we like
exporter.setConfiguration(configuration);
exporter.exportReport();