java - 贾斯珀报告 : How to combine two report streams into one PDF output?

Question

我有这段代码，根据给定条件一次仅生成一份 Jasper 报告为 PDF。但是，如果我想将两个 Jaspers 合并为一个 PDF 文件怎么办？ (即 PDF 输出应为 LoadTagR2R.jasper + LoadTagR2RLandscape.jasper - 这将是一个包含多个页面的 PDF 输出流)

        if (fullHalfTag.equalsIgnoreCase("Y")){ //Read FULL_HALF_TAG value (if FULL_HALF_TAG == 'Y')
            logger.debug("Printing FULL tag...");
            reportStream = getServletConfig().getServletContext().getResourceAsStream("/reports/LoadTagR2RLandscape.jasper");

        } else {
            logger.debug("Printing HALF tag...");
            reportStream = getServletConfig().getServletContext().getResourceAsStream("/reports/LoadTagR2R.jasper");

        }

        //Report parameters
        Map parameters = new HashMap();
        parameters.put("PLT_NO", pltNo);
        parameters.put("TICKET_NO", ticketNo);

          try {

             Connection conn = ConnectionUtils.getConnection();

             JasperRunManager.runReportToPdfStream(reportStream,servletOutputStream, parameters, conn);
             response.setContentType("application/pdf");

             servletOutputStream.flush();
             servletOutputStream.close();

我尝试合并两个输入流，如下所示，但没有成功。想法？

        new java.io.SequenceInputStream(s1, s2).

Answer 1

这是执行此操作的旧方法:

JasperPrint jasperPrint1 = JasperFillManager.fillReport(reportStream1,  parameters, conn);
JasperPrint jasperPrint2 = JasperFillManager.fillReport(reportStream2,  parameters, conn);

List<JasperPrint> list = new ArrayList<JasperPrint>();
list.add(jasperPrint1);
list.add(jasperPrint2);

JRPdfExporter exporter = new JRPdfExporter();

exporter.setParameter(JRPdfExporterParameter.JASPER_PRINT_LIST, list);
exporter.setParameter(JRPdfExporterParameter.OUTPUT_STREAM,servletOutputStream); 
exporter.exportReport();

编辑:

在 JasperReports 6.1.1 API JRPdfExporterParameter.JASPER_PRINT_LIST 和 JRPdfExporterParameter.OUTPUT_STREAM 已弃用添加新方法。

替换:

exporter.setParameter(JRPdfExporterParameter.JASPER_PRINT_LIST, list);
exporter.setParameter(JRPdfExporterParameter.OUTPUT_STREAM,servletOutputStream);

与

exporter.setExporterInput(SimpleExporterInput.getInstance(list));
exporter.setExporterOutput(new SimpleOutputStreamExporterOutput(servletOutputStream));