How to refresh jasper image without flickering?
- by Aru
Hi, I am using jasper reports to generate graph.
I am refresheing the graph.
But the problem is while refreshing the graph it is flickering.
Code is-
PrintWriter out = response.getWriter();
response.setContentType("text/html");
JRDataSource dataSource = createReportDataSource(perfArrayListSample.toArray());
ServletContext context = this.getServletConfig().getServletContext();
File reportFile = new File(context.getRealPath("/cpuUsageGraph.jasper"));
if (!reportFile.exists())
throw new JRRuntimeException("File cpuUsageGraph.jasper not found. The report design must be compiled first.");
JasperReport jasperReport = (JasperReport)JRLoader.loadObject(reportFile.getPath());
JasperPrint print = JasperFillManager.fillReport(jasperReport, new HashMap(), dataSource);
JRHtmlExporter exporter = new JRHtmlExporter();
request.getSession().setAttribute(ImageServlet.DEFAULT_JASPER_PRINT_SESSION_ATTRIBUTE, print);
exporter.setParameter(JRExporterParameter.JASPER_PRINT, print);
exporter.setParameter(JRExporterParameter.OUTPUT_WRITER, out);
exporter.setParameter(JRHtmlExporterParameter.IMAGES_URI, "image?ver="+new Date().getTime() +"&image=");
exporter.exportReport();
perfArrayListSample.clear();
So how to refresh the graph wihout flickering?
