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(); 

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