PDFBox not loading the content

Question

@RequestMapping(value = "/displaypdf.action", method = RequestMethod.GET)
    public void displaypdf(HttpServletRequest p_objRequest, HttpServletResponse p_objResponse,
            @RequestParam("filename") String p_sFilename) throws Exception {
        if (LOGGER.isDebugEnabled()) {
            LOGGER.debug(ClmSrDebugConstant.DISPLAYPDF);
        }
        String l_sReportName;
        Blob l_bContent = null;
        String l_sTcn = (String) p_objRequest.getSession().getAttribute(ClmSrConstant.TCN);
        ServletOutputStream l_objServletOutputStream = p_objResponse.getOutputStream();
        Map<String, Object> l_mapConfigFile = new HashMap<String, Object>();
        Document document = null;
        try {
            l_mapConfigFile = m_objClinicalService.retrieveMap(l_sTcn);
            Iterator<String> it = l_mapConfigFile.keySet().iterator();
            while (it.hasNext()) {
                String key = it.next();
                if (key.contains(p_sFilename)) {
                    l_bContent = (Blob) l_mapConfigFile.get(key);
                }
            }
            l_sReportName = p_sFilename;
            if (l_bContent != null) {
p_objResponse.setContentType("application/pdf");
                byte[] l_bytes = l_bContent.getBytes(1, (int) l_bContent.length());
                InputStream l_inptStrm = l_bContent.getBinaryStream();                
PDDocument doc = Loader.loadPDF(l_bytes);
                PDPage page = new PDPage();
                doc.addPage(page);
                String fileName = "C:\\Users\\dhs\\new.pdf";
                PDFTextStripper stripper = new PDFTextStripper();
                String text = stripper.getText(doc);
                
                PDPageContentStream contentStream = new 
                PDPageContentStream(doc, page);
                contentStream.beginText();

                contentStream.setFont(new PDType1Font(Standard14Fonts.FontName.TIMES_ROMAN), 12);
                contentStream.setLeading(14.5f);
                contentStream.newLineAtOffset(25, 500);
                text = text.replace("\n", "").replace("\r", "");
                contentStream.showText(text);

                contentStream.endText();
                contentStream.close(); 
                doc.save(fileName);
                
}
else {
                p_objResponse.setContentType(ClmSrConstant.TXT_CNTN_TYP);
                p_objResponse.getOutputStream().print(ClmSrConstant.NLP_REPORT_ERROR);
            }

            l_objServletOutputStream.flush();
            if (doc != null) {
                doc.close();
            }
            l_objServletOutputStream.close();

        } catch (Exception exExp) {
            if (LOGGER.isDebugEnabled()) {
                LOGGER.error(ClmSrDebugConstant.EXCEP_DISPLAYPDF, exExp);
            }
        }
    }

The pdf which is downloaded in system

using the pdfbox version as org.apache.pdfbox pdfbox 3.0.1

PDF downloaded is attached

Two chalenges i am facing with pdfbox is

1. i just only need to show the bytes data to pdf, no addition or updation to the pdf required, just the exact pdf which i get through the bytes data

2. i am able to save the pdf in pdfbox , which is through doc.save() but , requirement is to display it in UI, not to save... looked for solution but no help as of now

Answer 1

@mkl and @Tilman Thanks for the support .. this is the final solution which i updated that it might help someone who's looking for solution.

    @RequestMapping(value = "/displaypdf.action", method = RequestMethod.GET)
        public void displaypdf(HttpServletRequest p_objRequest, HttpServletResponse p_objResponse,
                @RequestParam("filename") String p_sFilename) throws Exception {
            if (LOGGER.isDebugEnabled()) {
                LOGGER.debug(ClmSrDebugConstant.DISPLAYPDF);
            }
            String l_sReportName;
            Blob l_bContent = null;
            String l_sTcn = (String) p_objRequest.getSession().getAttribute(ClmSrConstant.TCN);
            ServletOutputStream l_objServletOutputStream = p_objResponse.getOutputStream();
            Map<String, Object> l_mapConfigFile = new HashMap<String, Object>();
            
            try {
                l_mapConfigFile = m_objClinicalService.retrieveMap(l_sTcn);
                Iterator<String> it = l_mapConfigFile.keySet().iterator();
                while (it.hasNext()) {
                    String key = it.next();
                    if (key.contains(p_sFilename)) {
                        l_bContent = (Blob) l_mapConfigFile.get(key);
                    }
                }
                l_sReportName = p_sFilename;
                PDDocument doc = null;
                if (l_bContent != null) {
                    p_objResponse.setContentType("application/pdf");
                    byte[] l_bytes = l_bContent.getBytes(1, (int) l_bContent.length());
                    //InputStream l_inptStrm = l_bContent.getBinaryStream();
                    //text added by pdfbox changes begining
                    doc = Loader.loadPDF(l_bytes);
                    PDDocumentInformation pdd = doc.getDocumentInformation();  
                    pdd.setTitle(l_sReportName);   
                    doc.save(l_objServletOutputStream);
                        //text added by pdfbox changes end

// if we are not using pdfbox we can directly pass the bytes to the outputstream
//l_objServletOutputStream.write(l_bytes);
                } else {
                    p_objResponse.setContentType(ClmSrConstant.TXT_CNTN_TYP);
                    l_objServletOutputStream.print(ClmSrConstant.NLP_REPORT_ERROR);
                }
    
                l_objServletOutputStream.flush();
                if (doc != null) {
                    doc.close();
                }
                l_objServletOutputStream.close();
    
            } catch (Exception exExp) {
                    LOGGER.error(ClmSrDebugConstant.EXCEP_DISPLAYPDF, exExp);
            }
        }