PDF gets downloaded with txt extension in safari

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Java

servlet

Dear Experts,

Tool used : Java
Steps
1)Generate PDF (using jasperireport 3.6.1) java
2)Store On Server
3)Apply digital signature on stored server
4)Ready for download on page.
code below

  protected void processRequest(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException
    {
	String newfile = (new StringBuilder("/JCN/PDF/")).append(statementType).append("/").append(jpaccno).append(cnopdfnm).append(".pdf").toString();
        OutputStream os = new FileOutputStream(newfile);               
	net.sf.jasperreports.engine.JasperPrint jasperPrint = JasperFillManager.fillReport(CNote, jasperParameter, con);
        
	exporter.setParameter(JRExporterParameter.JASPER_PRINT, jasperPrint);
        exporter.setParameter(JRExporterParameter.OUTPUT_STREAM, os);
        exporter.setParameter(JRPdfExporterParameter.PERMISSIONS, new Integer(2068));
        exporter.exportReport();
        os.close();

        String coordinateQry = (new StringBuilder("select dg_point from doc_con where rownum=1 and doc_typ='")).append(statementType).append("' ").toString();
        rs = st.executeQuery(coordinateQry);
        rs.next();
        String coordinate = rs.getString(1);

        onlineDigitalSign(newfile, outs, coordinate);

        outs.close();
}
 public void onlineDigitalSign(String s, OutputStream outputstream, String coordinate)
    {
        try
        {
            logger.info((new StringBuilder("New File for online DG.sign...")).append(s).toString());
            BaseFont basefont = BaseFont.createFont("/usr/local/fonts/ZurichBT.TTF", "Cp1252", true);
            FontFactory.register("/usr/local/fonts/ZurichBT.TTF");
            KeyStore keystore = KeyStore.getInstance(KeyStore.getDefaultType());
            
		keystore.load(new FileInputStream("/mypath/sg.ks"), "prd34".toCharArray());
            
	    String s1 = (String)keystore.aliases().nextElement();
            PrivateKey privatekey = (PrivateKey)keystore.getKey(s1, "prd34".toCharArray());
            java.security.cert.Certificate acertificate[] = keystore.getCertificateChain(s1);
            PdfReader pdfreader = new PdfReader(s);
            PdfStamper pdfstamper = PdfStamper.createSignature(pdfreader, outputstream, '\0');
            PdfSignatureAppearance pdfsignatureappearance = pdfstamper.getSignatureAppearance();
            pdfsignatureappearance.setCrypto(privatekey, acertificate, null, PdfSignatureAppearance.WINCER_SIGNED);
            pdfsignatureappearance.setReason("Digitally Signed");
            pdfsignatureappearance.setLocation("in");
            String DGP[] = new String[4];
            DGP = coordinate.split(",");
            Float DGP1 = Float.valueOf(0.0F);
            Float DGP2 = Float.valueOf(0.0F);
            Float DGP3 = Float.valueOf(0.0F);
            Float DGP4 = Float.valueOf(0.0F);
            DGP1 = Float.valueOf(Float.parseFloat(DGP[0].trim()));
            DGP2 = Float.valueOf(Float.parseFloat(DGP[1].trim()));
            DGP3 = Float.valueOf(Float.parseFloat(DGP[2].trim()));
            DGP4 = Float.valueOf(Float.parseFloat(DGP[3].trim()));
            pdfsignatureappearance.setVisibleSignature(new Rectangle(DGP1.floatValue(), DGP2.floatValue(), DGP3.floatValue(), DGP4.floatValue()), 1, null);
            int i = pdfreader.getNumberOfPages();
            int j = 0;
            do
            {
                if(j > i)
                    break;
                if(++j == i)
                {
                    PdfContentByte pdfcontentbyte = pdfstamper.getOverContent(j);
                    pdfcontentbyte.beginText();
                    pdfcontentbyte.setFontAndSize(basefont, 9F);
                    pdfcontentbyte.showTextAligned(6, "This is a digitally signed ", 28F, 14F, 0.0F);
                    pdfcontentbyte.endText();
                }
            } while(true);
            HashMap hashmap = pdfreader.getInfo();
            hashmap.put("Subject", "My Statement");
            hashmap.put("Title", "My Statement");
            hashmap.put("Creator", "my name");
            hashmap.put("Producer", "my product Name");
            pdfstamper.setMoreInfo(hashmap);
            pdfstamper.close();
            logger.info("Finished.1..");
        }
        catch(Exception e)
        {
            logger.info((new StringBuilder("Exception Occured in onlineDigitalSign.....")).append(e.getMessage()).toString());
            logger.error((new StringBuilder("Exception Occured in onlineDigitalSign.....")).append(e).toString());
        }
    }

What I have tried:

we have tried setContentType=force-download

response.setContentType("application/force-download");
response.reset();
response.setHeader("Content-Disposition", "attachment;filename=CNotes.pdf");