Jasper报告导出pdf文件内容重复

Question

@RequestMapping(value = "/example", produces = "application/json; charset=utf-8")
public @ResponseBody
void example(@RequestParam(value = "url") String url, HttpSession session, HttpServletResponse response, HttpServletRequest request) throws SQLException {
    try {
        File reportFile;
        reportFile = new File(request.getSession().getServletContext().getRealPath("example.jasper"));
        JasperHelper.printReport("pdf", reportFile, parameters, this.dataSourceMNG.getConnection(), response);
    } catch (Exception ex) {
        Logger.getLogger(ClassName.class.getName()).log(Level.SEVERE, null, ex);
    }
    File reportFile = new File("");
    try{
        reportFile = new File(request.getSession().getServletContext().getRealPath("example.jasper"));
        JasperHelper.printReport("pdf", reportFile, parameters, this.dataSourceMNG.getConnection(), response);
    }catch(Exception ex){
        Logger.getLogger(ClassName.class.getName()).log(Level.SEVERE, null, ex);
    }
}

public static void printReport(String exportType, JasperReport jasperReport, String fileName, Map parameters, JRDataSource dataSource, HttpServletResponse response) {
    try {
        JasperPrint print = JasperFillManager.fillReport(jasperReport, parameters, dataSource);
        fileName = fileName.substring(0, fileName.length() - 6) + exportType;
        response.setContentType("application/" + exportType);
        response.setHeader("Content-Disposition", "attachment; filename=" + fileName);
        if (exportType.equalsIgnoreCase("pdf")) {
            JRPdfExporter exporter = new JRPdfExporter();
            exporter.setExporterInput(new SimpleExporterInput(print));
            exporter.setExporterOutput(new SimpleOutputStreamExporterOutput(response.getOutputStream()));
            exporter.exportReport();
        } else if (exportType.equalsIgnoreCase("xls")) {
            JRXlsExporter exporter = new JRXlsExporter();
            exporter.setExporterInput(new SimpleExporterInput(print));
            exporter.setExporterOutput(new SimpleOutputStreamExporterOutput(response.getOutputStream()));
            exporter.exportReport();
        } else if (exportType.equalsIgnoreCase("xlsx")) {
            JRXlsxExporter exporter = new JRXlsxExporter();
            exporter.setExporterInput(new SimpleExporterInput(print));
            exporter.setExporterOutput(new SimpleOutputStreamExporterOutput(response.getOutputStream()));
            exporter.exportReport();
        } else if (exportType.equalsIgnoreCase("rtf")) {
            JRRtfExporter exporter = new JRRtfExporter();
            exporter.setExporterInput(new SimpleExporterInput(print));
            exporter.setExporterOutput(new SimpleWriterExporterOutput(response.getOutputStream()));
            exporter.exportReport();
        }
        response.flushBuffer();
    } catch (Exception ex) {
        Logger.getLogger(JasperHelper.class.getName()).log(Level.SEVERE, null, ex);
    }
}

抱歉我的英语不好。我点击了一个按钮，当我点击按钮时会执行示例方法。它将调用printReport两次并导出到一个pdf文件。但是当打开pdf文件有3页时，我在微软边缘打开它显示第一页，当它在chrome上打开它显示2结束页面。我不知道为什么会出现问题？如何解决它？ 感谢。