SpringCloud 实战二十：自定义gateway的filter

1、创建自定义过滤器

须实现两个接口：GlobalFilter、Ordered

package com.laoxu.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;

@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("uname");
        if(uname == null){
            log.info("**********用户名为null，非法用户！");
            exchange.getResponse().setStatusCode(HttpStatus.NOT_ACCEPTABLE);
            return exchange.getResponse().setComplete();
        }
        return chain.filter(exchange);
    }

    @Override
    public int getOrder() {
        return 0;
    }
}

说明：该过滤器实现在请求网关的时候必须携带uname请求参数，如果没有携带直接不可访问。

2、启动服务

3、访问：http://localhost:9527/payment/lb

4、携带uname参数访问：http://localhost:9527/payment/lb?uname=x 成功！