优化这段代码： public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception { if (handler instanceof HandlerMethod) { HandlerMethod handlerMethod = (HandlerMethod) handler; Method method = handlerMethod.getMethod(); RepeatSubmit annotation = method.getAnnotation(RepeatSubmit.class); if (annotation != null) { if (this.isRepeatSubmit(request, annotation)) { AjaxResult ajaxResult = AjaxResult.error(annotation.message()); ServletUtils.renderString(response, JSON.toJSONString(ajaxResult)); return false; } } } boolean flag = false; TokenService tokenService = SpringUtils.getBean(TokenService.class); LoginAppUser loginUser = tokenService.getLoginUser(request); if (loginUser != null && loginUser.getGuest() != null && loginUser.getGuest().getGuestNum() != null) { tokenService.verifyToken(loginUser); String guestNum = loginUser.getGuest().getGuestNum(); HttpSession httpSession = request.getSession(); RedisCache redisUtil = SpringUtils.getBean(RedisCache.class); Guest guest = redisUtil.getCacheMapValue(RedisConstants.GUEST_MAP, guestNum); SysGuest sysGuest = JSON.parseObject(JSON.toJSONString(guest), SysGuest.class); if (sysGuest == null) { flag = false; httpSession.removeAttribute(Constants.SERVER_TYPE_APP); } else { if (httpSession.getAttribute(Constants.SERVER_TYPE_APP) == null) { httpSession.setAttribute(Constants.SERVER_TYPE_APP , sysGuest); } return true; } } //获取网名 也就是/login String servletPath = request.getServletPath(); if(servletPath.contains("/app/card/isCard") || servletPath.contains("/app/bank/signingBankCard") || servletPath.contains("/app/bank/sendMessage") || servletPath.contains("/app/bank/sendSysMessage") || servletPath.contains("/app/bank/login") || servletPath.contains("/app/card/guestIdAndPhone") || servletPath.contains("/app/family/isDevice") || servletPath.contains("/websocket/") || servletPath.contains("/upload/") || servletPath.contains("/app/deviceSocket/toSocket")) { flag = true; } if (!flag) { noLogin(response); } return flag; }

首先，可以将比较长的 if 语句拆分成多个小的 if 语句，这样可以使代码更易读。例如，可以将 `if (loginUser != null && loginUser.getGuest() != null && loginUser.getGuest().getGuestNum() != null)` 拆分成三个 if 语句。

其次，可以使用常量或者枚举类型来表示一些常用的字符串，例如 Constants.SERVER_TYPE_APP 和 RedisConstants.GUEST_MAP。

最后，可以使用 try-with-resources 语句来自动关闭资源，例如 redisUtil。这样可以避免因为忘记关闭资源而导致的内存泄漏问题。

以下是优化后的代码：

public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        if (handler instanceof HandlerMethod) {
            HandlerMethod handlerMethod = (HandlerMethod) handler;
            Method method = handlerMethod.getMethod();
            RepeatSubmit annotation = method.getAnnotation(RepeatSubmit.class);
            if (annotation != null) {
                if (this.isRepeatSubmit(request, annotation)) {
                    AjaxResult ajaxResult = AjaxResult.error(annotation.message());
                    ServletUtils.renderString(response, JSON.toJSONString(ajaxResult));
                    return false;
                }
            }
        }

        boolean flag = false;
        TokenService tokenService = SpringUtils.getBean(TokenService.class);
        LoginAppUser loginUser = tokenService.getLoginUser(request);
        if (loginUser != null) {
            Guest guest = loginUser.getGuest();
            if (guest != null) {
                String guestNum = guest.getGuestNum();
                tokenService.verifyToken(loginUser);
                HttpSession httpSession = request.getSession();
                RedisCache redisUtil = SpringUtils.getBean(RedisCache.class);
                try (redisUtil) {
                    Guest cacheGuest = redisUtil.getCacheMapValue(RedisConstants.GUEST_MAP, guestNum);
                    SysGuest sysGuest = JSON.parseObject(JSON.toJSONString(cacheGuest), SysGuest.class);
                    if (sysGuest != null) {
                        if (httpSession.getAttribute(Constants.SERVER_TYPE_APP) == null) {
                            httpSession.setAttribute(Constants.SERVER_TYPE_APP, sysGuest);
                        }
                        return true;
                    }
                }
            }
        }

        String servletPath = request.getServletPath();
        if (servletPath.contains("/app/card/isCard")
                || servletPath.contains("/app/bank/signingBankCard")
                || servletPath.contains("/app/bank/sendMessage")
                || servletPath.contains("/app/bank/sendSysMessage")
                || servletPath.contains("/app/bank/login")
                || servletPath.contains("/app/card/guestIdAndPhone")
                || servletPath.contains("/app/family/isDevice")
                || servletPath.contains("/websocket/")
                || servletPath.contains("/upload/")
                || servletPath.contains("/app/deviceSocket/toSocket")) {
            flag = true;
        }

        if (!flag) {
            noLogin(response);
        }

        return flag;
    }