Wt

    import java.io.*;      import javax.servlet.*;      import javax.servlet.http.*;                  public class CookDemo1 extends HttpServlet {              public void doPost(HttpServletRequest request, HttpServletResponse response){          try{                response.setContentType("text/html");          PrintWriter out = response.getWriter();                        String n=request.getParameter("userName");          out.print("Welcome "+n);           ...