1、Eureka注册中心
2、spring cloud gateway网关

Eureka不解释了。
1、启动Eureka注册中心。
2、new module

然后next，选择spring web、eureka discovery client、gateway

然后next，finish。
pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.5.5</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.jw</groupId>
    <artifactId>demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>demo</name>
    <description>Demo project for Spring Boot</description>
    <properties>
        <java.version>1.8</java.version>
        <spring-cloud.version>2020.0.4</spring-cloud.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-webflux</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-gateway</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>
        <dependency>
            <groupId>io.projectreactor</groupId>
            <artifactId>reactor-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>
    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>${spring-cloud.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

application.yml

server:
  port: 5000 # 服务端口
spring:
  application:
    name: gateway # 服务名称

  cloud:
    gateway:
      discovery:
        locator:
          enabled: true
          lower-case-service-id: true
      routes:
        - id: ums
          uri: lb://UMS #eureka注册中心存在的服务名称
          predicates:
            - Path=/ums/** #路径配置
#          filters:
#            - StripPrefix=1     #忽略Path配置的个数，此处为1代表访问/api/customer/**时，会将api忽略，真实的访问地址为lb://admin-api/customer/**,如果为2，则为lb://admin-api/**

eureka:
  client:
    service-url:
      defaultZone: http://localhost:8080/eureka # 指定服务注册中心

启动类

@SpringBootApplication
@EnableEurekaClient
public class DemoApplication {

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

}

启动Eureka、gateway、ums（我的子服务的名称）

访问：localhost:5000/ums/role/hello

ums controller

@RestController
@RequestMapping("role")
public class RoleController {
    @Value("${server.port}")
    String port;

    @GetMapping("hello")
    public String hello(){
        return "hello,port："+port;
    }
}

可以看到已经通过网关成功调用。