攔截器

• 1.編寫一個攔截器實現HandlerInterceptor接口
• 2.攔截器注冊到容器中(實現WebMvcConfigurer的addInterceptors)
• 3.指定攔截規則[如果是攔截所有，靜態資源也會被攔截]

1、HandlerInterceptor 接口

/*** 登錄檢查* 1、配置好攔截器要攔截哪些請求* 2、把這些配置放在容器中*/ @Slf4j public class LoginInterceptor implements HandlerInterceptor {/*** 目標方法執行之前* @param request* @param response* @param handler* @return* @throws Exception*/@Overridepublic boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {String requestURI = request.getRequestURI();log.info("preHandle攔截的請求路徑是{}",requestURI);//登錄檢查邏輯HttpSession session = request.getSession();Object loginUser = session.getAttribute("loginUser");if(loginUser != null){//放行return true;}//攔截住。未登錄。跳轉到登錄頁request.setAttribute("msg","請先登錄"); // re.sendRedirect("/");request.getRequestDispatcher("/").forward(request,response);return false;}/*** 目標方法執行完成以后* @param request* @param response* @param handler* @param modelAndView* @throws Exception*/@Overridepublic void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {log.info("postHandle執行{}",modelAndView);}/*** 頁面渲染以后* @param request* @param response* @param handler* @param ex* @throws Exception*/@Overridepublic void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {log.info("afterCompletion執行異常{}",ex);} }

2、配置攔截器

/*** 1、編寫一個攔截器實現HandlerInterceptor接口* 2、攔截器注冊到容器中（實現WebMvcConfigurer的addInterceptors）* 3、指定攔截規則【如果是攔截所有，靜態資源也會被攔截】*/ @Configuration public class AdminWebConfig implements WebMvcConfigurer {@Overridepublic void addInterceptors(InterceptorRegistry registry) {registry.addInterceptor(new LoginInterceptor()).addPathPatterns("/**") //所有請求都被攔截包括靜態資源.excludePathPatterns("/","/login","/css/**","/fonts/**","/images/**","/js/**"); //放行的請求} }

test

• 執行順序
  

總結

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