重构这个方法将其认知复杂度从17降低到允许的15：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; }

public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception

这是一个Java语言中的方法声明，声明了一个名为preHandle的方法，它接收三个参数：HttpServletRequest对象、HttpServletResponse对象和Object对象。这个方法可能用于Java Web中的拦截器中，在请求被处理前进行拦截并...

@Slf4j public class LoopCallInterceptor implements HandlerInterceptor { @Override public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception { //调用接口 // 头部获取当前请求所经过且没结束请求的path列表 // 判定path列表中是否包含当前path //无则正常访问并记录到列表中 //有则告警循环调用，并终止调用，返回异常 return true; //return HandlerInterceptor.super.preHandle(request, response, handler); } @Override public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception { //HandlerInterceptor.super.postHandle(request, response, handler, modelAndView); //正常结束接口 //获取头部path列表 //从path列表中删除当前path } }

It takes in the HttpServletRequest and HttpServletResponse objects, as well as the Object representing the handler method that will handle the request. The preHandle method first checks if ...

public class LoginInterceptor implements HandlerInterceptor { public LoginInterceptor() { } public boolean preHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o) throws Exception { return true; } public void postHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, ModelAndView modelAndView) throws Exception { } public void afterCompletion(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) throws Exception { } }

public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception { Object user = request.getSession().getAttribute("user"); if (user == null) { ...

package com.de.debook.interceptor; import com.de.debook.entity.User; import com.de.debook.constant.WebConstant; import org.springframework.stereotype.Component; import org.springframework.web.servlet.HandlerInterceptor; import org.springframework.web.servlet.ModelAndView; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession; @Component public class AuthorityInterceptor implements HandlerInterceptor { // 权限拦截器 @Override public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception { HttpSession session = request.getSession(); User user = (User) session.getAttribute(WebConstant.SESSION_KEY_USER); // 用户未登录状态返回登录页面 if (user == null) { response.sendRedirect("/user/login.html"); return false; } return true; } @Override public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception { } @Override public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception { } }

在 preHandle 方法中，首先获取 HttpSession 中的 User 对象，如果 User 为 null，说明用户未登录，此时将请求重定向到登录页面，并返回 false，拦截请求。如果 User 不为 null，说明用户已经登录，放行请求，返回 ...

修改一下这个inceptor，我要求查看请求访问”/user/api"的用户的role_id是否为2（通过token)，否则拒绝访问：public class MyInceptor implements HandlerInterceptor { // 处理指定接口 private static final String TOKEN_LOGIN = "/user/token"; private static final String USER_NO_URL = "/user/no"; // 拦截不存在的接口路径 // 不要要校验的接口 private static final List<String> NO_NEED_LOGIN = new ArrayList<>(Arrays.asList("/user/health", "/logout")); @Override public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception { // 在请求处理之前执行的操作 System.out.println("=====preHandle====="); return true; // 返回true表示继续处理请求，返回false表示终止请求处理 } @Override public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception { // 在请求处理之后，视图渲染之前执行的操作 System.out.println("=====postHandle====="); } @Override public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception { // 在请求完成之后执行的操作，即视图渲染完成后 System.out.println("=====afterCompletion====="); } }

public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception { // 在请求处理之前执行的操作 System.out.println("=====preHandle====="); // ...

public class LoginInterceptor implements HandlerInterceptor { @Override public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception { //获取session中存储的登录用户的信息 Admin admin = (Admin) request.getSession().getAttribute("loginAdmin"); Object parentMenu = request.getSession().getAttribute("parentMenu"); Object subMenu = request.getSession().getAttribute("subMenu"); if(admin == null || admin.getUserName() == null || parentMenu == null || subMenu == null){ //判断是否是Ajax请求获取到请求头中的Ajax参数 String XRequested =request.getHeader("X-Requested-With"); //Ajax请求中带有的参数 String ajaxReq = "XMLHttpRequest"; if(ajaxReq.equals(XRequested)) { Map<String, Object> map = new HashMap<>(1); map.put("result", "IsAdminAjax"); String data = JSON.toJSONString(map); response.getWriter().write(data); return false; } else { System.out.println("拦截请求"); System.out.println("请求地址为：" + request.getRequestURI()); response.sendRedirect(request.getContextPath()+"/system/toTimeOutPage"); } return false; } return true; } @Override public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception { } @Override public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception { } }

这段代码是一个 Java 类，实现了 HandlerInterceptor 接口，并重写了 preHandle、postHandle 和 afterCompletion 方法。这个类用于拦截请求，在用户未登录或者登录失效时，跳转到登录页面或者返回 AJAX 请求。其中，...

下面的语句如何重定向到登录界面：public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception { Map<String,Object> map = new HashMap<>(); //令牌建议是放在请求头中，获取请求头中令牌 String token = request.getHeader("token"); try{ JWTUtils.verify(token);//验证令牌 return true;//放行请求 } catch (SignatureVerificationException e) { e.printStackTrace(); map.put("msg","无效签名"); } catch (TokenExpiredException e) { e.printStackTrace(); map.put("msg","token过期"); } catch (AlgorithmMismatchException e) { e.printStackTrace(); map.put("msg","token算法不一致"); } catch (Exception e) { e.printStackTrace(); map.put("msg","token失效"); } map.put("state",false);//设置状态 //将map转化成json，response使用的是Jackson String json = new ObjectMapper().writeValueAsString(map); response.setContentType("application/json;charset=UTF-8"); response.getWriter().print(json); return false; }

public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception { Map,Object> map = new HashMap(); //令牌建议是放在请求头中，获取请求头中令牌 ...

@Component public class LoginInterceptor implements HandlerInterceptor { @Override public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception { String requestURI = request.getRequestURI(); if(requestURI.contains("/login")){ return true; // 放行登录请求 } // 从cookie中获取用户名 String username = null; Cookie[] cookies = request.getCookies(); if (cookies != null) { for (Cookie cookie : cookies) { if ("username".equals(cookie.getName())) { username = cookie.getValue(); break; } } } // 如果cookie中包含用户名，放行 if (username != null) { return true; } // 如果cookie中不包含用户名，跳转到登录页面 response.sendRedirect("/pages/login.html"); return false; } }

这段代码是一个登录拦截器，用于拦截未登录用户的请求。当用户请求的URI不包含/login时，首先从cookie中获取用户名，如果存在用户名则放行请求，否则跳转到登录页面。如果用户请求的URI包含/login，则直接放行请求。...

public class AdminInterceptor extends HandlerInterceptorAdapter{ /** * 检测登录状态 */ @Override public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception { String uri = request.getRequestURI(); if(uri.contains("css/") || uri.contains("js/") || uri.contains("img/") || uri.contains("login") || uri.contains("logout")) { return true; // 不拦截路径 } Object username = request.getSession().getAttribute("username"); if (Objects.nonNull(username) && !username.toString().trim().isEmpty()) { return true; // 登录验证通过 } response.sendRedirect("login.jsp"); return false; // 其他情况一律拦截 } }

这段代码是一个Spring MVC中的拦截器，用于拦截用户请求并检查用户是否已经登录。具体分析如下： 1. 继承HandlerInterceptorAdapter类该类是Spring MVC中拦截器的基类，继承该类可以方便地实现拦截器。 2. 实现...

基于SSM框架 JSP Controller Intercepter拦截器（public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception { boolean flag = false; // HttpSession session = request.getSession(); User user = (User)session.getAttribute("userCheck"); if(null == user){ // session.setAttribute("message", "修改成功！！"); // response.sendRedirect(request.getContextPath()+"/login.jsp"); }else{ flag = true; } return flag; }） ServiceImpl Service Mapper Mapper.xml 用户登录流程“登录需要通过系统输入工号和密码，接着进行信息是否符合验证以及权限信息验证。若是验证成功后，将用户信息存放进新创建的session，然后跳转到系统首页。若是登录的用户权限不同，进入系统后菜单界面所拥有的功能也会不同。”的代码描述

拦截器会通过preHandle方法来判断用户是否已经登录过，如果已经登录过，就返回true；否则，将用户重定向到登录页面。在Controller中，如果拦截器返回true，说明用户已经登录过，接着调用Service层中的方法进行用户...

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