将JasperReport导出到PDF OutputStream？

Question

我正在编写一个非常简单的示例项目，以使自己熟悉Jasper Reports。我想将已配置的报告导出为PDF OutputStream，但是没有工厂方法：

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")));

如何在中获取PDF OutputStream？

Answer 1

好的，这就是它的工作原理。JasperFillManager实际上返回一个JasperPrint对象，因此：

// 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));

请享用。