1、断言
断言的作用:每一个Predicate的使用,你可以理解为:当满足这种条件后才会被转发,如果是多个,那就是都满足的情况下被转发。
参照官网有多种断言,如下图:
2、过滤器
过滤器的作用与断言相似
package com.springcloud.filter;
import lombok.extern.slf4j.Slf4j;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.http.HttpStatus;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;
import java.util.Date;
/**
* @author dc
* @date 2020/8/3 - 16:28
*/
@Component
@Slf4j
//自定义过滤器必须实现GlobalFilter、Ordered这两个接口
//断言、过滤器的作用都是定义一个规范,满足该规范的请求才能不被过滤
public class MyGateWayFilter implements GlobalFilter, Ordered {
@Override
public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
log.info("*******come in MyGateWayFilter: " + new Date());
String uname = exchange.getRequest().getQueryParams().getFirst("uname");
if (uname == null) {
log.info("****** 用户名为空,非法用户!!!");
exchange.getResponse().setStatusCode(HttpStatus.NOT_ACCEPTABLE);
return exchange.getResponse().setComplete();
}
return chain.filter(exchange);
}
@Override
public int getOrder() {
return 0;
}
}