Cookie操作以及如何在js中调用jsp变量

存Cookie

Cookie idCookie = new Cookie("userId", request.getParameter("id"));
Cookie psdCookie = new Cookie("psd", request.getParameter("psd"));
idCookie.setMaxAge(3600);//存3600秒也就是1小时
psdCookie.setMaxAge(3600);
response.addCookie(idCookie);
response.addCookie(psdCookie);

取Cookie

      Cookie cookies[] = request.getCookies();
      if(cookies != null){
          System.out.println("**********" + cookies.length);
          for(int i = 0; i < cookies.length; i++){
              if(cookies[i].getName().equals("userId")){
                  user_id = cookies[i].getValue();
              }else{
                  if(cookies[i].getName().equals("psd")){
                      psd = cookies[i].getValue();
                  }
              }
              if(user_id != null && psd != null){
                  break;
              }
          }

在 js 中调用 jsp 变量

  <script language="javascript">
      document.loginform.id.value = '<%=user_id == null ? "" : user_id%>';
      document.loginform.psd.value = '<%=psd == null ? "" : psd%>';
  </script>