@Component
@Slf4j
public class BlackListFilter implements GlobalFilter, Ordered{
    private  static final List<String> blackList=new ArrayList<>();
    static {
        blackList.add("0:0:0:0:0:0:0:1");//模拟本机ip地址 fhadmin.cn
    }
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        ServerHttpRequest request = exchange.getRequest();
        ServerHttpResponse response =exchange.getResponse();
        String clientIp = request.getRemoteAddress().getHostString();
        if (blackList.contains(clientIp)){
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            log.error(clientIp+"在黑名单中，拒绝访问");
            String data = "request be denied";
            DataBuffer wrap = response.bufferFactory().wrap(data.getBytes());
            return response.writeWith(Mono.just(wrap));
        }
        return chain.filter(exchange);
    }
    @Override
    public int getOrder() {
        return 0;
    }
}