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protected void doPost(HttpServletRequest request,
  HttpServletResponse response) {
  
  String username = request.getParameter("username");
  char[] password = request.getParameter("password").toCharArray();
  boolean rememberMe = Boolean.valueOf(request.getParameter("rememberme"));
  
  LoginService loginService = new LoginServiceImpl();
        
  if (rememberMe) {
    if (request.getCookies()[0] != null && request.getCookies()[0].getValue() != null) {
      String[] value = request.getCookies()[0].getValue().split(";");
      
      if (!loginService.isUserValid(value[0], value[1].toCharArray())) {
        // set error and return
      } else {
        // forward to welcome page
      }
    } else {
        boolean validated = loginService.isUserValid(username, password);
      
        if (validated) {
          Cookie loginCookie = new Cookie("rememberme", username
                             + ";" + password.toString(new String(password));
          response.addCookie(loginCookie);
          // ... forward to welcome page
        } else {
          // set error and return
        }
     }
   } else { // no remember me functionality selected
      // proceed with regular authentication, if it fails set error and return
   }
    
  Arrays.fill(password, ' ');
}