So lösen Sie das Problem der Speicherung von Benutzertokens in Redis

//生成一个token对象,保存在redis中
redisTemplate.opsForHash().put("token","user",user);

//以JSON字符串形式返回token
@RequestMapping(value = "/getToken",method = RequestMethod.GET)
@ResponseBody
public User getToken(){
    User user = (User) redisTemplate.opsForHash().get("token", "user");
    return user;
}

//发送ajax请求，获取token
function get_token(){
    $.ajax({
        url:"getToken",
        type:"GET",
        dataType:"JSON",
        success:function(result){
            //将返回的用户信息保存在token中
            var token = result;
            //打印登录用户
            console.log(token);
            //打印登录用户的id
            console.log(token.id);
            document.getElementById('username').innerText = "用户名:"+token.username;
        }
    });
}

//注销
@RequestMapping("/logout")
public String logout(){
    redisTemplate.opsForHash().delete("token","user");
    return "/login";
}

@Component

public class RedisUtil {

    @Autowired
    private RedisTemplate redisTemplate;   //key-value是对象的

    //判断是否存在key
    public boolean hasKey(String key) {
        return redisTemplate.hasKey(key);
    }

    //从redis中获取值
    public Object get(String key) {
        return redisTemplate.opsForValue().get(key);
    }

    //向redis插入值
    public boolean set(final String key, Object value) {
        boolean result = false;
        try {
            redisTemplate.opsForValue().set(key, value);
            result = true;
        } catch (Exception e) {
            e.printStackTrace();
        }
        return result;
    }

    //向redis插入值带过期时间 单位:分钟
    public boolean set(final String key, Object value, long time) {
        boolean result = false;
        try {
            redisTemplate.opsForValue().set(key, value, time, TimeUnit.MINUTES);
            result = true;
        } catch (Exception e) {
            e.printStackTrace();
        }
        return result;
    }

    //redis删除值
    public boolean del(final String key) {
        return redisTemplate.delete(key);
    }

    //批量删除某个字段开始的key
    public long batchDel(String key) {
        Set<String> set = redisTemplate.keys(key + "*");
        return redisTemplate.delete(set);
    }

}

@Component
public class UserUtil {
    @Autowired
    private RedisUtil redisUtil;
    @Autowired
    private HttpServletRequest request;

    /**
     * 后台管理的登录id
     *
     * @return
     */
    public JsonResult getUser() {
        String header = request.getHeader("#与前端约定的统一字段#");
        //解密
        String decrypt = DESUtil.decrypt(header);
        if (!redisUtil.hasKey(decrypt))return JsonResult.error("未登录");
        User user = null;
        try {
            user = (User) redisUtil.get(decrypt);
        } catch (Exception e) {
            e.printStackTrace();
        }
        if (decrypt == null) return JsonResult.error("权限不足");
        return JsonResult.success(user);
    }
}

        JsonResult jsonResult = userUtil.getUser();
        if (jsonResult.getCode() != 1) return jsonResult;
        //强转成对象。此处不用担心强转失败，因为存入的时候就是对象存储，只不过为了复用，存的是object类型
        User user= (User) jsonResult.getData();
        return JsonResult.success(#service层#);
    }