在SpringBoot中实现自定义拦截器

1. 创建类实现SpringMVC框架的HandlerInterceptor接口

   public interface HandlerInterceptor {
    default boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        return true;
    }
    
    default void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, @Nullable ModelAndView modelAndView) throws Exception {
    }
    
    default void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, @Nullable Exception ex) throws Exception {
    }
   }

2. SpringBoot中注册拦截器：

   @Configuration
   public class MyAppConfig implements WebMvcConfigurer {
    
       //添加拦截器对象， 注入到容器中
       @Override
       public void addInterceptors(InterceptorRegistry registry) {
    
           //创建拦截器对象
           HandlerInterceptor interceptor = new LoginInterceptor();
    
           //指定拦截的请求uri地址
           String path []= {"/user/**"};
           //指定不拦截的地址
           String excludePath  [] = {"/user/login"};
           registry.addInterceptor(interceptor)
                   .addPathPatterns(path)
                   .excludePathPatterns(excludePath);
    
       }
   }