Clients%20make%20requests%20to%20Spring%20Cloud%20Gateway.%20If%20the%20Gateway%20Handler%20Mapping%20determines%20that%20a%20request%20matches%20a%20route,%20it%20is%20sent%20to%20the%20Gateway%20Web%20Handler.%20This%20handler%20runs%20the%20request%20through%20a%20filter%20chain%20that%20is%20specific%20to%20the%20request.%20The%20reason%20the%20filters%20are%20divided%20by%20the%20dotted%20line%20is%20that%20filters%20can%20run%20logic%20both%20before%20and%20after%20the%20proxy%20request%20is%20sent.%20All%20“pre”%20filter%20logic%20is%20executed.%20Then%20the%20proxy%20request%20is%20made.%20After%20the%20proxy%20request%20is%20made,%20the%20“post”%20filter%20logic%20is%20run.

翻译：客户端向%20Spring%20Cloud%20Gateway%20发出请求。如果网关处理程序映射确定请求与路由匹配，则将其发送到网关%20Web%20处理程序。该处理程序通过特定于请求的过滤器链来运行请求。%20筛选器由虚线分隔的原因是，筛选器可以在发送代理请求之前和之后运行逻辑。所有%20“前置“%20过滤器逻辑均被执行，然后发出代理请求，发出代理请求后，将运行“%20后置%20”过滤器逻辑。总结：路由转发%20+%20执行过滤器链

predicates:
  - Path=/payment/lb/**

predicates:
  - Path=/payment/lb/**
  - Query=name, zhangsan

@Component
@Slf4j
public class MyGlobalFilter implements GlobalFilter, Ordered {
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        String username = exchange.getRequest().getQueryParams().getFirst("username");
        //用户名为空时，给出错误响应
        if (username == null) {
            log.info("用户名为空，非法登录");
            exchange.getResponse().setStatusCode(HttpStatus.NOT_ACCEPTABLE);
            return exchange.getResponse().setComplete();
        }
        return chain.filter(exchange);
    }
    @Override
    public int getOrder() {
        return 0;
    }
}