Cookie操作以及如何在js中调用jsp变量

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);

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;
}
}

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