Can i insert bootstrap inside the servlet page? If its possible then how?

Question

I am trying to design .java pages in which i am fetching the data from database like simply i have a database and i am using servlet to fetch the data (.java file) which gives me the stored user's information but i am doing it by the help of out.println(""); so it just print the plane text/html but i need more design without using jsp or other framework if its possible. cause i don't have lots of knowledge about jsp and I am new to this Advance java.

    public class profile extends HttpServlet {
        public void doGet(HttpServletRequest req, HttpServletResponse res) throws IOException {
             
           Connect connect = new Connect();
            res.setContentType("text/html");
            PrintWriter out = res.getWriter();
            HttpSession session = req.getSession();
            
            String fname = (String) session.getAttribute("name");
            String lname = "", pass = "";
            
            try {
                Connection con = connect.getConnection();
                PreparedStatement stmt = con.prepareStatement("select * from register where firstname = ?");
                stmt.setString(1, fname);
    
                ResultSet rs = stmt.executeQuery();
    
                if (rs.next()) {
                    fname = (String)rs.getString(1);
                    lname = (String)rs.getString(2);
                    pass = (String)rs.getString(3);
    
                }
            //   out.println("/index.html");
           
                out.println("your profile :<br>");
            out.println("your name  is: " + fname + "<br>");
            out.println("Your last name is: " + lname + "<br>");
            out.println("Your Password is: " + pass + "<br>");
             out.println("<a href='changePass.html'>Change  password</a>");
             out.println("<a href='delete'>delete user</a>");
            } catch (Exception e) {
                out.println(e);
            }
            
           
            
    
         
            
            
        }
        
        
    }