@Component
@Slf4j
public class MyLogGateWayFilter implements GlobalFilter,Ordered {
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        log.info("*********come in MyLogGateWayFilter: "+new Date());
        String uname = exchange.getRequest().getQueryParams().getFirst("username");
        if(StringUtils.isEmpty(username)){
            log.info("*****用户名为Null 非法用户,(┬＿┬)");
            //设置响应状态码为未授权
            exchange.getResponse().setStatusCode(HttpStatus.NOT_ACCEPTABLE);//给人家一个回应
            return exchange.getResponse().setComplete();
        }
        return chain.filter(exchange);
    }
    //这个方法在项目启动的时候就会访问
    @Override
    public int getOrder() {
        //值越小越先执行, 当有多个过滤器的时候,值越小就越先执行
        return 0;
    }
}