springcloud gateway设置context-path的操作

spring:
  cloud:
    gateway:
      routes:
      # 网关本身没有contextPath,通过自己转发自己，达到能处理contextPath
      - id: self
        uri: Http://localhost:${server.port}
        predicates:
        - Path=/${spring.application.name}/**
        filters:
        - StripPrefix=1
        order: -11000

package com.yiche.ballast.filter;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.annotation.Order;
import org.springframework.core.io.buffer.DataBuffer;
import org.springframework.http.httpstatus;
import org.springframework.http.server.Reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.WEB.server.WebFilter;
import reactor.core.publisher.Mono; 
 
@Configuration
public class ApiFilter {
    @Value("${spring.cloud.gateway.api-prefix:/gateway}")
    private String prefix; 
    @Bean
    @Order(-1)
    public WebFilter apiPrefixFilter() {
        return (exchange, chain) -> {
            ServerHttpRequest request = exchange.getRequest();
 
            String path = request.getURI().getRawPath();
            if (!path.contains(prefix)) {
                ServerHttpResponse response = exchange.getResponse();
                response.setStatusCode(HttpStatus.BAD_GATEWAY);
 
                DataBuffer buffer = response
                        .bufferFactory()
                        .wrap(HttpStatus.BAD_GATEWAY.getReasonPhrase().getBytes());
                return response.writeWith(Mono.just(buffer));
            }
            String newPath = path.replaceFirst(prefix, "");
            ServerHttpRequest newRequest = request.mutate().path(newPath).build();
 
            return chain.filter(exchange.mutate().request(newRequest).build());
        };
    }
}

spring:
    cloud:
        gateway:
            routes:
            - id: api-route
              filters:
                - StripPrefix=1
              predicates:
                - name: Path
                  args[pattern]: /gateway/api/**
              uri: lb://xxx-api