SpringBoot拦截器的设置

1.登录拦截实现HandlerInterceptor接口

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public class LoginInterceptor implements HandlerInterceptor {     /**      *      * @param request 请求对象      * @param response 响应对象      * @param handler 处理器（url+controller）,映射      * @return 返回值为true，放行请求；返回值为false，拦截当前请求      * @throws Exception      */     @Override     public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {           User user = (User) request.getSession().getAttribute("user");         // 用户没有登陆过         if(null == user){             response.sendRedirect("/web/login.html");             return false;         }           return true;     } }

2.定义配置类取实现WebMvcConfigurer 接口，重写addInterceptors方法

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// 加载当前的拦截器并进行注册 @Configuration public class MyAppConfig implements WebMvcConfigurer {     /**      * 拦截器      * @param registry      */     @Override     public void addInterceptors(InterceptorRegistry registry) {         // 创建拦截器对象         HandlerInterceptor handlerInterceptor = new LoginInterceptor();           // 白名单         List<String> excludePath = new ArrayList<>();         excludePath.add("/bootstrap3/**");         excludePath.add("/css/**");         excludePath.add("/images/**");         excludePath.add("/js/**");         excludePath.add("/web/register.html");         excludePath.add("/web/login.html");         excludePath.add("/web/product.html");         excludePath.add("/users/login");         excludePath.add("/users/register");         excludePath.add("/index.html");           registry.addInterceptor(handlerInterceptor)                 .addPathPatterns("/**")                 .excludePathPatterns(excludePath);     }   }