07 登陆拦截器

3）、登陆

开发期间模板引擎页面修改以后，要实时生效

1）、禁用模板引擎的缓存

# 禁用缓存

spring.thymeleaf.cache=false

2）、页面修改完成以后ctrl+f9：重新编译；

登陆错误消息的显示

4）、拦截器进行登陆检查

拦截器

/**

* 登陆检查，

*/publicclassLoginHandlerInterceptorimplementsHandlerInterceptor{//目标方法执行之前@OverridepublicbooleanpreHandle(HttpServletRequest

request, HttpServletResponse response, Object handler)throwsException{ 

      Object user =

request.getSession().getAttribute("loginUser");if(user

==null){//未登陆，返回登陆页面request.setAttribute("msg","没有权限请先登陆");           

request.getRequestDispatcher("/index.html").forward(request,response);returnfalse; 

      }else{//已登陆，放行请求returntrue;        }   

}@OverridepublicvoidpostHandle(HttpServletRequest request,

HttpServletResponse response, Object handler, ModelAndView

modelAndView)throwsException{   

}@OverridepublicvoidafterCompletion(HttpServletRequest request,

HttpServletResponse response, Object handler, Exception

ex)throwsException{    }}

注册拦截器

//所有的WebMvcConfigurerAdapter组件都会一起起作用@Bean//将组件注册在容器publicWebMvcConfigurerAdapterwebMvcConfigurerAdapter(){ 

      WebMvcConfigurerAdapter adapter =newWebMvcConfigurerAdapter()

{@OverridepublicvoidaddViewControllers(ViewControllerRegistry

registry){               

registry.addViewController("/").setViewName("login");               

registry.addViewController("/index.html").setViewName("login");         

registry.addViewController("/main.html").setViewName("dashboard");       

    }//注册拦截器@OverridepublicvoidaddInterceptors(InterceptorRegistry

registry){//super.addInterceptors(registry);//静态资源；  *.css ,

*.js//SpringBoot已经做好了静态资源映射registry.addInterceptor(newLoginHandlerInterceptor()).addPathPatterns("/**") 

.excludePathPatterns("/index.html","/","/user/login");            }     

  };returnadapter;    }