一、GateWay项目创建

首先启动本地nacos，具体可参考：Nacos Windows安装_雨欲语的博客-CSDN博客

新建工程项目spring_cloud_test,pom引入依赖：

<parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.5.6</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>spring_cloud_gateway</artifactId>

    <properties>
        <maven.compiler.source>8</maven.compiler.source>
        <maven.compiler.target>8</maven.compiler.target>
    </properties>

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

创建启动类：

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;


@SpringBootApplication
public class GatewayApplication {
    public static void main(String[] args) {
        SpringApplication.run(GatewayApplication.class, args);
    }
}

新建配置文件：

server:
  port: 9999
spring:
  application:
    name: service-gateway
  cloud: # 配置Spring Cloud相关属性
    gateway:
      discovery: # 配置网关发现机制
        locator: # 配置处理机制
          # 只要请求地址符合规则： http://gatewayIP:gatewayPort/微服务名称/微服务请求地址
          # 网关自动映射。把请求转发到 http://微服务名称/微服务请求地址
          # 如：有微服务，命名是service-one
          # 请求地址是： http://localhost:9999/service-one/nacos/test
          # 自动转发到： http://service-one/nacos/test
          # 商业开发中，enabled一般不设置，使用默认值false。避免不必要的自动转发规则。
          enabled: false # 开启网关自动映射处理逻辑
          lower-case-service-id: true # 开启小写转换
    nacos:
      # nacos用户名和密码
      username: nacos
      password: nacos
      discovery:
        # nacos地址
        server-addr: 127.0.0.1
        group: dev
        namespace: dev
        metadata:
          version: v1.0.0

启动项目，然后在nacos中可看见服务注册成功：

二、子项目创建

新建子项目service_one,service_two。

pom引入依赖：

 <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.5.6</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>service_one</artifactId>

    <properties>
        <maven.compiler.source>8</maven.compiler.source>
        <maven.compiler.target>8</maven.compiler.target>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <!--Spring Cloud Alibaba Nacos discovery -->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
        </dependency>

    </dependencies>

启动类：

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;


@SpringBootApplication
@EnableDiscoveryClient
public class OneApplication {
    public static void main(String[] args) {
        SpringApplication.run(OneApplication.class, args);
    }
}

controller：

import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
@RequestMapping("/nacos")
public class NacosTestController {

    @GetMapping("/test")
    public String test(){
        return "8080";
    }
}

配置文件：

server:
  port: 8080
spring:
  application:
    name: service-one
  cloud:
    nacos:
      username: nacos
      password: nacos
      discovery:
        enabled: true
        register-enabled: true
        server-addr: 127.0.0.1
        group: dev
        namespace: dev
        metadata:
          version: v1.0.0

另外一个服务同理，只是换一个port，然后启动，可在nacos看见服务已注册上去：