printWriter() in servlet

I have servlet to retrieve image from oracle DB inside doGet() and it works fine but when using printwriter() the code does not work? can you help me please

protected void doGet(HttpServletRequest request, HttpServletResponse response)
      throws ServletException, IOException {
     response.setContentType("text/html;charset=UTF-8");PrintWriter out = response.getWriter();

     String id = request.getParameter("submit");
    try {

        Class.forName("oracle.jdbc.driver.OracleDriver");
        Connection con = DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:xe", "APP_DB", "1234");
        PreparedStatement ps = con.prepareStatement("select photo from photos where id = ?");
        ps.setString(1, id);
        ResultSet rs = ps.executeQuery();
        rs.next();
        Blob b = rs.getBlob("photo");
        response.setContentType("image/jpeg");
        response.setContentLength((int) b.length());
        InputStream is = b.getBinaryStream();
        OutputStream os = response.getOutputStream();
        byte buf[] = new byte[(int) b.length()];
        is.read(buf);
        os.write(buf);
         os.close();
        out.print("<a href='DisplyExcServlet'>visit</a>");//does not work            

    } catch (Exception ex) {
        System.out.println(ex.getMessage());
    }