1.拦截器进行登录检查

1/*登陆检查*/
2//拦截器要注册到容器中
3public class LoginHandlerInterceptor implements HandlerInterceptor {
4    //目标方法执行之前
5    @Override
6    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
7		//获取session域，获取到loginUser，看是否登录
8        HttpSession session = request.getSession();
9        Object loginUser = session.getAttribute("loginUser");
10        if (loginUser==null){
11            //未登录，返回登录页面
12            //获取转发器，并转发
13            request.setAttribute("msg","没有权限请先登录");
14            request.getRequestDispatcher("/index.html").forward(request,response);
15            return false;
16        }else {
17            //已登录，放行
18            return true;
19        }
20    }
21}
22
23@Configuration
24public class MyMvcConfig implements WebMvcConfigurer {
25    @Override
26    public void addViewControllers(ViewControllerRegistry registry) {
27        //映射到login.html页面
28        registry.addViewController("/").setViewName("login");
29        registry.addViewController("/index.html").setViewName("login");
30		//做重定向
31        registry.addViewController("/main.html").setViewName("dashboard");
32    }
33
34
35    //将MyLocaleResolver加到注册
36    @Bean
37    public LocaleResolver localeResolver(){
38        return new MyLocaleResolver();
39    }
40
41   //注册拦截器
42    @Override
43    public void addInterceptors(InterceptorRegistry registry) {
44		//拦截器拦截所有请求，但放行以下请求
45        registry.addInterceptor(new LoginHandlerInterceptor()).addPathPatterns("/**").excludePathPatterns("/","/index.html","/login.html","/user/login","/webjars/**","/asserts/**");
46    }
47}