建 application.yml 文件

server:
  # 服务端口号
  port: 7609
spring:
  application:
    # 服务名称 - 服务之间使用名称进行通讯
    name: service-test4
  datasource:
    driver-class-name: com.mysql.cj.jdbc.Driver
    url: jdbc:mysql://localhost:3306/mysql?useUnicode=true&characterEncoding=UTF-8&&serverTimezone=GMT
    username: root
    password: 123456

pom 文件

<?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>
    <groupId>com.example</groupId>
    <artifactId>service-test4</artifactId>
    <version>1.0</version>
    <name>测试服务7</name>
    <description>service-test4</description>
    <parent>
        <groupId>com.example</groupId>
        <artifactId>spring-cloud-demo</artifactId>
        <version>1.0</version>
    </parent>
    <properties>
        <java.version>1.8</java.version>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <spring-boot.version>2.3.7.RELEASE</spring-boot.version>
        <spring-cloud.version>Greenwich.RELEASE</spring-cloud.version>
    </properties>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <!-- SpringBoot 2.1.X 以上版本这样配置 -->
                <version>${spring-cloud.version}</version>
                <!-- <version>Dalston.RC1</version> -->
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>
    </dependencies>

<!--    <dependencyManagement>-->
<!--        <dependencies>-->
<!--            <dependency>-->
<!--                <groupId>org.springframework.boot</groupId>-->
<!--                <artifactId>spring-boot-dependencies</artifactId>-->
<!--                <version>${spring-boot.version}</version>-->
<!--                <type>pom</type>-->
<!--                <scope>import</scope>-->
<!--            </dependency>-->
<!--        </dependencies>-->
<!--    </dependencyManagement>-->

    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.8.1</version>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                    <encoding>UTF-8</encoding>
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <version>2.3.7.RELEASE</version>
                <configuration>
                    <mainClass>com.example.servicetest4.ServiceTest4Application</mainClass>
                </configuration>
                <executions>
                    <execution>
                        <id>repackage</id>
                        <goals>
                            <goal>repackage</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>

</project>
启动类：

package com.example.servicetest4;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
//(exclude= {DataSourceAutoConfiguration.class})  加上这注解不用配置数据源，不加需要配置数据源

@SpringBootApplication(exclude= {DataSourceAutoConfiguration.class})
@EnableEurekaClient
public class ServiceTest4Application {

    public static void main(String[] args) {
        SpringApplication.run(ServiceTest4Application.class, args);
    }

}
测试看到下面两个图：说明简单的一个子项目以及搭建成功