springboot登录拦截

1、配置拦截器

@Component
public class LoginHandlerInterceptor implements HandlerInterceptor {
    
    
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
    
    
        Object user = request.getSession().getAttribute(CommonConstants.USER_ATTRIBUTE);
        if (user == null) {
    
    
            request.setAttribute("msg", "请先登录");
            // 获取request返回页面到登录页
            request.getRequestDispatcher("/login.ftl").forward(request, response);
            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 {
    
    }
}

2、配置拦截规则

@Configuration
public class MyWebMvcConfigurer implements WebMvcConfigurer {
    
    
    @Override
    public void addViewControllers(ViewControllerRegistry registry) {
    
    
        registry.addViewController("/login.ftl").setViewName("login");//
    }
    /**
     * 配置拦截规则
     * @param registry
     */
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
    
    
        registry.addInterceptor(new LoginHandlerInterceptor())
                .addPathPatterns("/**")//拦截所有
                .excludePathPatterns("/demo/pa*", "/login/*", "/login/auth*", "/login.ftl",
                        "/demo/getUserList*.json")//放行
                .excludePathPatterns("/static/**"); //放行
    }
}