public class LoginInterceptor implements HandlerInterceptor {

     @Override

     public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {

         System.out.println("已经进入了登录拦截器......");

         // 逻辑代码按照之前的方式去编写即可

         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 {

     }

 }

 // 当前类变成配置拦截器类

 @Configuration

 public class WebConfig extends WebMvcConfigurerAdapter {

     @Override

     public void addInterceptors(InterceptorRegistry registry) {

         // 需要拦截的路径

         String[] addPathPatterns = {"/test/**"};

         //不拦截的路径

         String[] excludePathPatterns = {"/index", "/myjsp"};

 //        注册登录拦截器(此拦截器注册多行就是,添加多个拦截器)

         registry.addInterceptor(new LoginInterceptor())

                 .addPathPatterns(addPathPatterns).

                 excludePathPatterns(excludePathPatterns);

     }

 }