Hi,
I'd like to integrate jasper reports. All going well, except for how
Jasper locates images in a web environment, using an ImageServlet. The
demo app from jasper requires that I set a map into the http session
which contains a cache of the images as they are called.
Here is a snippet of my code:
@Resource
private HttpServletRequest httpRequest;
public Response getCustomerList(ReportQuery reportQuery)
{
log.debug("Start - getCustomerList");
log.debug("Customer Id:
"+reportQuery.getCustomerId());
log.debug("Start from controller id:
"+reportQuery.getStartFromControllerId());
// TODO: this is an example report only
used to test the framework.
ByteArrayOutputStream baos = new
ByteArrayOutputStream();
try {
InputStream is =
ResourceUtils.getClasspathResourceStream("/WEB-INF/jasperreports/WebappR
eport.jasper", this.getClass(), BusFactory.getDefaultBus());
JasperReport
jasperReport = (JasperReport)JRLoader.loadObject(is);
Map parameters = new
HashMap();
parameters.put("ReportTitle", "Address Report");
JasperPrint jasperPrint
=
JasperFillManager.fillReport(
jasperReport,
parameters,
new DataSourceStub()
);
JRHtmlExporter exporter
= new JRHtmlExporter();
httpRequest.getSession().setAttribute(ImageServlet.DEFAULT_JASPER_PRINT_
SESSION_ATTRIBUTE, jasperPrint);
exporter.setParameter(JRExporterParameter.JASPER_PRINT, jasperPrint);
exporter.setParameter(JRExporterParameter.OUTPUT_STREAM, baos);
exporter.setParameter(JRHtmlExporterParameter.IMAGES_URI,
"image?image=");
exporter.exportReport();
} catch (JRException e) {
e.printStackTrace();
}
return Response.ok(baos.toString(),
"text/html").build();
}
Note the @Resource private HttpServletRequest httpRequest field. Is
this the best way to do this? Is the field thread safe? As I potentially
have a lot of users requesting this service...
Cheers,
Matt.
