SpringCloudGateway 自定义局部过滤器场景分析_Java

场景：

将所有请求转化为同一路径请求（方便穿网配置）在请求头内标识原来路径，然后在将请求分发给不同服务

alltoonegatewayfilterfactory

import lombok.getter;
import lombok.setter;
import lombok.extern.slf4j.slf4j;
import org.springframework.cloud.gateway.filter.gatewayfilter;
import org.springframework.cloud.gateway.filter.factory.abstractgatewayfilterfactory;
import org.springframework.http.server.reactive.serverhttprequest;
import org.springframework.stereotype.component;
@component
@slf4j
public class alltoonegatewayfilterfactory extends abstractgatewayfilterfactory<alltoonegatewayfilterfactory.config> {
    public alltoonegatewayfilterfactory() {
        super(config.class);
    }
    @override
    public gatewayfilter apply(config config) {
        return (exchange, chain) -> {
            serverhttprequest request = exchange.getrequest();
            request.geturi();
            // 替换路径
            string path = request.getpath().tostring();
            serverhttprequest modifiedrequest = request.mutate().header(config.headername, path).path(config.gettopath()).build();
            exchange = exchange.mutate().request(modifiedrequest).build();
            log.info("alltoone: headers{{}:{}}, {} ---> {}", config.getheadername(),path, request.geturi(), modifiedrequest.geturi());
            return chain.filter(exchange);
        };
    }
    @setter
    @getter
    public static class config {
        private string headername;
        private string topath;
    }
}

 spring:
  cloud:
    gateway:
      httpclient:
        ssl:
          useinsecuretrustmanager: true
      routes:
       - id: alltoone_fnpt
         uri: http://localhost:19982
         predicates:
           - path=/**
         filters:
           - name: alltoone
             args:
               headername: api-path
               topath: /api/unified

注意：1.类名必须以gatewayfilterfactory结尾否则会出现不识别的情况

2.配置的filters -name 的值为类的前缀（截取gatewayfilterfactory之后的）

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