基于redis实现token验证用户是否登陆

<dependency>
 <groupId>org.springframework.boot</groupId>
 <artifactId>spring-boot-starter-data-redis</artifactId>
</dependency>
<dependency>
 <groupId>org.springframework.session</groupId>
 <artifactId>spring-session-data-redis</artifactId>
 <version>2.0.5.RELEASE</version>
</dependency>

//若用户登录验证成功后将对应的登陆信息和登陆凭证一起存入redis中
//生成登陆凭证token UUID
String uuidToken= UUID.randomUUID().toString();
uuidToken=uuidToken.replace("-","");
 
//将token和用户登录态之间建立联系
redisTemplate.opsForValue().set(uuidToken,userModel);
redisTemplate.expire(uuidToken,1, TimeUnit.HOURS);
 
// 下发token
return CommonReturnType.create(uuidToken);

 String token = httpServletRequest.getParameterMap().get("token")[0];
 if (StringUtils.isEmpty(token)) {
 throw new BusinessException(EmBusinessError.USER_NOT_LOGIN, "用户还未登陆,不能下单");
 }
 //获取用户的登陆信息
 UserModel userModel= (UserModel) redisTemplate.opsForValue().get(token);
 if(userModel==null){
 throw new BusinessException(EmBusinessError.USER_NOT_LOGIN, "用户还未登陆,不能下单");
 }
 
 OrderModel orderModel = orderService.creatOrder(userModel.getId(), itemId, promoId, amount);
 return CommonReturnType.create(null);

if(data.status == "success") {
 alert("登陆成功");
 //取出token放入localstorage
 var token = data.data;
 window.localStorage["token"] = token;
 window.location.href = "listitem.html";
}

var token = window.localStorage["token"];
 if(token == null){
 alert("没有登录，不能下单");
 window.location.href="login.html" rel="external nofollow" ;
 return false;
 } 

url:"http://"+g_host+"/order/createorder?token="+token,