How to add parameter from request body in JasperReports?

I am using JasperReports for to generate and export PDF file. I am not directly connected with datebase.Here is my code
 
 
@RequestMapping(value = "/pdfReport", method = RequestMethod.PUT, produces = MediaType.APPLICATION_JSON_VALUE)
public void downloadPDF(HttpServletResponse response, @RequestBody ReportTransport reportTransport) throws IOException, JRException {
    InputStream jasperStream = this.getClass().getResourceAsStream("report2.jrxml");
    JasperDesign design = JRXmlLoader.load(jasperStream);
    JasperReport report = JasperCompileManager.compileReport(design);
    Map<String, Object> parameterMap = new HashMap<>();
    List<ReportDescription> reportDescriptions = storageManager.getPDFReport(reportTransport);
    JRDataSource jrDataSource = new JRBeanCollectionDataSource(reportDescriptions);
    parameterMap.put("datasource", jrDataSource);
 
    JasperPrint jasperPrint = JasperFillManager.fillReport(report, parameterMap, jrDataSource);
    response.setContentType("application/pdf");
    response.setHeader("Content-Disposition", "inline; filename=report.pdf");
 
    final OutputStream outputStream = response.getOutputStream();
    JasperExportManager.exportReportToPdfStream(jasperPrint, outputStream);
}