spring cloud gateway 集成 nacos注册中心

1，文档

spring cloud alibaba nacos 集成文档
https://sca.aliyun.com/docs/2023/user-guide/nacos/quick-start/?spm=7145af80.74fdb509.0.0.605970212LoM4b

spring cloud 文档（对国人不太友好）
https://www.springcloud.cc/

2，安装nacos

请参照：https://www.jianshu.com/writer#/notebooks/54745399/notes/124936132

3，maven 配置

版本
spring-boot 3.4.1
spring-cloud 2024.0.0
spring-cloud-alibaba 2023.0.3.2

    <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-gateway</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-loadbalancer</artifactId>
        </dependency>
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
        </dependency>
    </dependencies>

这个版本的spring-cloud loadbalancer 从gateway里分离出来了，所以一定要单独引入

3，gateway 项目

3.1 启动类要加上 @EnableDiscoveryClient

@SpringBootApplication
@EnableDiscoveryClient
@Slf4j
public class GatewayMain {
    public static void main(String[] args) {
        SpringApplication.run(GatewayMain.class, args);
        log.info("网关启动成功");
    }
}

3.2 注册中心配置

nacos:
      discovery:
        server-addr: 127.0.0.1:8848
        username: nacos
        password: 123456
        namespace: test-dubbo-local
        group: DEFAULT_GROUP
        enabled: true

注意点：

同一个项目的微服务（包括网关），要在同一个命名空间（namespace）与group下

3.3 网关路由配置

server:
  port: 20001
spring:
  application:
    name: gateway
  cloud:
    gateway:
      discovery:
        locator:
          enabled: true
          lower-case-service-id: true
      filter:
        strip-prefix:
          enabled: true
#      routes:
#        - id: dubbo-demo
#          uri: lb://dubbo-demo
#          predicates:
#            - Path=/dubbo-demo/**
#          filters:
#            - StripPrefix=1
#        - id: dubbo-demo1
#          uri: http://127.0.0.1:10002
#          predicates:
#            - Path=/d1/**
#          filters:
#            - StripPrefix=1
    
# 打印日志
logging:
  level:
    com.alibaba.cloud.nacos.discovery: debug
    # 这个带着nacos 路由信息
    org.springframework.cloud.gateway: debug

两种方式（不要同时用，否则可能会造成混乱）
1，根据服务名称自动路由
必须得引入loadbalancer 否则503

  gateway:
      discovery:
        locator:
          # 打开后就根据nacos上的服务名 自动路由
          enabled: true
          lower-case-service-id: true
      filter:
        # 实际访问时 去掉uri里的 服务名
        strip-prefix:
          enabled: true

url 例子：http://127.0.0.1:20001/dubbo-demo/test/t1

2，主动配置路由：可以修改请求前缀

      routes:
        - id: dubbo-demo
          uri: lb://dubbo-demo
          predicates:
            - Path=/dubbo-demo-1/**
          filters:
            - StripPrefix=1
        - id: dubbo-demo1
          uri: http://127.0.0.1:10002
          predicates:
            - Path=/d1/**
          filters:
            - StripPrefix=1

lb://dubbo-demo 的意思就是从nacos里取路由信息负载均衡。与自动路由一样需要引入loadbalancer
url例子：http://127.0.0.1:20001/dubbo-demo-1/test/t1
【lb://】后面是nacos 的服务名

写死ip的就不需要引入loadbalancer
url例子：http://127.0.0.1:20001/d1/test/t1

请求日志

[gateway] [ctor-http-nio-2] o.s.c.g.h.RoutePredicateHandlerMapping   : Route matched: ReactiveCompositeDiscoveryClient_dubbo-demo
[gateway] [ctor-http-nio-2] o.s.c.g.h.RoutePredicateHandlerMapping   : Mapping [Exchange: GET http://127.0.0.1:20001/dubbo-demo/test/t1] to Route{id='ReactiveCompositeDiscoveryClient_dubbo-demo', uri=lb://dubbo-demo, order=0, predicate=Paths: [/dubbo-demo/**], match trailing slash: true, gatewayFilters=[[[RewritePath /dubbo-demo/?(?<remaining>.*) = '/${remaining}'], order = 1]], metadata={dubbo.metadata-service.url-params={"prefer.serialization":"hessian2,fastjson2","version":"2.0.0","dubbo":"2.0.2","release":"3.3.1","side":"provider","port":"10002","protocol":"tri"}, nacos.instanceId=192.168.2.33#10002#null#dubbo-demo, nacos.weight=1.0, nacos.cluster=DEFAULT, nacos.ephemeral=true, nacos.healthy=true, dubbo.endpoints=[{"port":10002,"protocol":"dubbo"},{"port":10002,"protocol":"tri"}], dubbo.metadata.revision=24d6431f291b5cdb7ae0ba58b4b97c15, dubbo.metadata.storage-type=local, meta-v=2.0.0, timestamp=1736486700990}}
[gateway] [ctor-http-nio-2] o.s.c.g.h.RoutePredicateHandlerMapping   : [e04a8b0b-1] Mapped to org.springframework.cloud.gateway.handler.FilteringWebHandler@2ec5cc14
2025-01-10T14:43:57.732+08:00 DEBUG 13428 --- [gateway] [ctor-http-nio-2] o.s.c.g.handler.FilteringWebHandler      : Sorted gatewayFilterFactories: [[GatewayFilterAdapter{delegate=org.springframework.cloud.gateway.filter.RemoveCachedBodyFilter@4d2f9e3c}, order = -2147483648], [GatewayFilterAdapter{delegate=org.springframework.cloud.gateway.filter.AdaptCachedBodyGlobalFilter@69d667a5}, order = -2147482648], [GatewayFilterAdapter{delegate=org.springframework.cloud.gateway.filter.NettyWriteResponseFilter@671da0f9}, order = -1], [GatewayFilterAdapter{delegate=org.springframework.cloud.gateway.filter.ForwardPathFilter@646e6d07}, order = 0], [[RewritePath /dubbo-demo/?(?<remaining>.*) = '/${remaining}'], order = 1], [GatewayFilterAdapter{delegate=org.springframework.cloud.gateway.filter.RouteToRequestUrlFilter@686b1e2d}, order = 10000], [GatewayFilterAdapter{delegate=org.springframework.cloud.gateway.filter.ReactiveLoadBalancerClientFilter@6cc8da1c}, order = 10150], [GatewayFilterAdapter{delegate=org.springframework.cloud.gateway.filter.LoadBalancerServiceInstanceCookieFilter@39a3984c}, order = 10151], [GatewayFilterAdapter{delegate=org.springframework.cloud.gateway.filter.WebsocketRoutingFilter@5501d1c8}, order = 2147483646], GatewayFilterAdapter{delegate=com.zx.filter.MyGlobalFilter@29c244e}, [GatewayFilterAdapter{delegate=org.springframework.cloud.gateway.filter.NettyRoutingFilter@4404a6b}, order = 2147483647], [GatewayFilterAdapter{delegate=org.springframework.cloud.gateway.filter.ForwardRoutingFilter@6e7e0259}, order = 2147483647]]

4，引入配置中心

请参考：https://www.jianshu.com/p/ec1c3154c86e
引入配置中心后，更改路由就不用重启项目了