iReport 多个报表组成一个PDF

最新推荐文章于 2023-05-08 15:46:57 发布

原创最新推荐文章于 2023-05-08 15:46:57 发布 · 260 阅读

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本文介绍如何在JSP页面中使用JasperReports生成包含多个子报表的PDF文件。通过创建多个JasperPrint实例并将它们添加到ArrayList中，可以实现多报表的组合输出。文章还展示了如何设置输出流及导出配置。

//在jsp页面中

<%

//new 一个 ArrayList集合 把 要显示的JasperPrint 放进去
  ArrayList jasperPrintList = new ArrayList();
   JasperPrint jasperPrintArr = JasperFillManager.fillReport ("reportAva.jasper",  new HashMap(), new AvaDataSource());  
   JasperPrint jasperPrintCpu = JasperFillManager.fillReport ("cpuIReport.jasper",  new HashMap(), new CpuDatasource());  
   JasperPrint jasperPrintFan = JasperFillManager.fillReport ("FanReport.jasper",  new HashMap(), new FanDatasource());
   JasperPrint jasperPrintLinAva = JasperFillManager.fillReport ("LinAvaReport1.jasper",  new HashMap(), new LinDatasource());
   JasperPrint jasperPrintLinDis = JasperFillManager.fillReport ("LinDisReport.jasper",  new HashMap(), new LinDisDatasource());
   JasperPrint jasperPrintMemory = JasperFillManager.fillReport ("MemoryReport.jasper",  new HashMap(), new MemoryDatasource());
   JasperPrint jasperPrintPower = JasperFillManager.fillReport ("PowerReport.jasper",  new HashMap(), new powerDatasource());
   JasperPrint jasperPrintTpt = JasperFillManager.fillReport ("TptReport.jasper",  new HashMap(), new TptDatasource());
   JasperPrint jasperPrintVol = JasperFillManager.fillReport ("VolReport.jasper",  new HashMap(), new VolDatasource());
   JasperPrint jasperPrintTile = JasperFillManager.fillReport ("Title_report.jasper",  new HashMap(), new VolDatasource());
   jasperPrintList.add(jasperPrintTile);
   jasperPrintList.add(jasperPrintArr);
   jasperPrintList.add(jasperPrintCpu);
   jasperPrintList.add(jasperPrintLinAva);
   jasperPrintList.add(jasperPrintMemory);
   jasperPrintList.add(jasperPrintLinDis);
   jasperPrintList.add(jasperPrintFan);
   jasperPrintList.add(jasperPrintVol);
   jasperPrintList.add(jasperPrintPower);
   jasperPrintList.add(jasperPrintTpt);
   
  //报表编译之后生成的.jasper 文件的存放位置
   //传递报表中用到的参数值

  Map parameters = new HashMap();  
   ByteArrayOutputStream baos = new ByteArrayOutputStream();
   JRPdfExporter exporter = new JRPdfExporter();
   exporter.setParameter(JRExporterParameter.JASPER_PRINT_LIST,jasperPrintList);
   exporter.setParameter(JRExporterParameter.OUTPUT_STREAM, baos);
  
   exporter.exportReport();
   byte[] bytes= baos.toByteArray();//得到这个流
  
  System.out.println("---------Jasper end-------------");
   response.setContentType("application/pdf");
   response.setContentLength(bytes.length);
   ServletOutputStream ouputStream = response.getOutputStream();
   ouputStream.write(bytes, 0, bytes.length);
   ouputStream.flush();
   ouputStream.close();
%>

<html>
  <head>
  </head>
  
  <body>
    
   </body>
</html>

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