Springboot 自定义配置拦截器

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//使用WebMvcConfigurerAdapter可以来扩展SpringMVC的功能
//@EnableWebMvc   不要接管SpringMVC
@Configuration
public class MyMvcConfig extends WebMvcConfigurerAdapter {


    //通过继承WebMvcConfigurerAdapter类，自定义注册试视图控制器来进行页面特定的导向
    @Override
    public void addViewControllers(ViewControllerRegistry registry) {
        // super.addViewControllers(registry);
        //浏览器发送 /atguigu 请求来到 success
        registry.addViewController("/login").setViewName("main");
    }


    //通过继承WebMvcConfigurerAdapter类，自定义注册拦截器到容器中, 可用于判断用户是否已经登录
    @Override
    public void addInterceptors(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(new LoginHandlerInterceptor()).addPathPatterns("/**")
    //                        .excludePathPatterns("/index.html","/","/user/login");
    }
}

package com.atguigu.springboot.component;

import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * 登陆检查，
 */
public class LoginHandlerInterceptor implements HandlerInterceptor {
    //目标方法执行之前
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        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);
            return false;
        } else {
            //已登陆，放行请求
            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 {

    }
}