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添加拦截器配置

@Configuration
public class MvcConfig implements WebMvcConfigurer {

    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(InterceptorEnum.DEMO_HANDLER);
    }
}

• 使用 @Configuration 注解，使得被 springboot 加载为配置
• 实现 WebMvcConfigurer 接口，然后通过覆盖它提供的默认方法，来添加配置
• 对于拦截器来说就是重写 addInterceptors 方法

拦截器的具体实现

public enum InterceptorEnum implements HandlerInterceptor {
    DEMO_HANDLER {
        @Override
        public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
                throws Exception {
            HandlerMethod handlerMethod = (HandlerMethod) handler;
            Class<?> controllerClass = handlerMethod.getBeanType();
            Method controllerMethod = handlerMethod.getMethod();
            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 {

        }
    };
}

• 我们可以把几种拦截器都放在这里
• preHandle 表示拦截之前
• postHandle 表示拦截之后
• afterCompletion 表示 DispatcherServlet 进行视图的渲染之后的逻辑