SpringBoot中的拦截器 interceptor

public class MyInterceptor extends HandlerInterceptorAdapter {
    public MyInterceptor(){
        System.out.println("MyInterceptor contructor...........");
    }
    //在执行目标方法之前
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
            System.out.println("MyInterceptor preHandle");
            return true;
    }
    //在执行目标方法之后，在目标方法return 返回响应视图之前
    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        System.out.println("MyInterceptor postHandle");
    }
    //在目标方法return 返回响应视图之后
    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        System.out.println("MyInterceptor afterCompletion");
    }
}

/**
 * 配置中心
 * 拦截器、视图解析器的配置等 web
 */
@EnableWebMvc  //启用Spring MVC支持
@Configuration //允许在上下文中注册额外的bean或导入其他配置类
public class ConfigRegistCenter implements WebMvcConfigurer {
    //注册拦截器
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(new MyInterceptor()).addPathPatterns("/**");
                                                     .excludePathPatterns("/login")
                                                    .excludePathPatterns("/regist"); 
    }
}
http://localhost:8080/demo/login
http://localhost:8080/demo/regist

要求：我的xx（收藏，订单，个人中心，简历....）需要用户登录过后才能观察看的
controller: /myorder/18392839
            /resume/
        /job/
             /member/getcode
            /member/login
            /member/regist
 前端:    /myorder/info.jsp
    /myorder/all.jsp
    /member/login.jsp
    /member/regist.jsp
    /resume.jsp
静态资源：
    /static/css
        /js
        /images
        /dist
        /layui
      registry.addInterceptor(new LoginInterceptor())
            .addPathPatterns("/**")
            .excludePathPatterns("/member/getcode", "/member/login",
                       "/member/regist", "/job/**","/company"
                                 "/css/**",                                                                 "/js/**","/images/**","/layui/**","/dist/**");

public class LoginInterceptor implements HandlerInterceptor {
    //检查登录业务拦截器，执行(controller)login方法之前就需要拦截检验的，所以需要把拦截的业务写在preHandle方法中
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        HttpSession session = request.getSession();
        Member member = (Member)session.getAttribute("loginUser");
        if(member ==null){
            System.out.println("用户尚未登录，请先登录");
           // request.getRequestDispatcher("/member/login.jsp").forward(request, response);
             response.sendRedirect(request.getContextPath()+"/member/login.jsp");
            return  false;
        }
        else{
            System.out.println("用户已经登录，放行");
            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 {
    }
}

/**
 * WebConfigurer 需要实现WebMvcConfigurer接口，并实现里面的连个方法
 * （老版本的spring-boot中使用的是WebMvcConfigurerAdapter,新版本中已经过时，
 *  还有不能通过继承WebMvcConfigurationSupport这个类实现，这样会在某些情况下失效） *
 */
@Configuration //允许在上下文中注册额外的bean或导入其他配置类
public class WebConfigurer implements WebMvcConfigurer {
    //这个方法用于注册拦截器，我们自己定义的拦截器需要通过在这里添加注册后才能生效
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        //addPathPatterns 用来设置拦截路径
        //excludePathPatterns 用来设置白名单，也就是不需要触发这个拦截器的路径。
        //addPathPatterns("/**") 表示拦截所有的请求
        //.excludePathPatterns("/login","/regist")表示出了登录与注册之外，都会拦截（因为登录注册不需要登录页可以访问）
        registry.addInterceptor(new LoginInterceptor())
                .addPathPatterns("/**")
                .excludePathPatterns("/member/getcode", "/member/login",
                                     "/member/regist","/css/**",
                                     "/js/**","/images/**","/layui/**","/dist/**");
    }
    //这个方法是用来配置静态资源的，比如html,js,css等
    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {
    }
}