HandlerInterceptor+WebMvcConfigurer - 自定义拦截器

1.自定义拦截器
自定义一个类实现HandlerInterceptor接口，类上添加@Component注解。
根据需要重写方法

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.添加拦截规则
自定义一个配置类实现WebMvcConfigurer

@Configuration
public class WebConfig implements WebMvcConfigurer {
    @Resource
    private LoginInterceptor loginInterceptor;

    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(loginInterceptor).excludePathPatterns("/user/login","/user/register");//添加拦截器，配置静态资源路径
    }
}