一、创建父工程

1、点击 File——》New——》Project

2、只选择红框中的数据，不要选择 Create from archetype，点击 Next

3、填写name、Location、GroupId、ArtifactId，在点击 Finish

4、父工程创建成功后，删除 src 文件夹

二、创建子工程 

5、右键父工程名称，选择New——》Module

 6、只选择红框中的数据，不要选择 Create from archetype，点击 Next

 7、填写name、Location、GroupId、ArtifactId，在点击 Finish

8、创建子工程成功

三、引入pom.xml文件

9、父工程demo的pom.xml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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>org.example</groupId>
    <artifactId>demo</artifactId>
    <packaging>pom</packaging>
    <version>1.0-SNAPSHOT</version>

    <modules>
        <module>order-service</module>
    </modules>

    <!--设置父工程的包为pom-->
    <packaging>pom</packaging>

    <!--引入Spring Boot项目，子项目都是这个版本-->
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.3.9.RELEASE</version>
        <relativePath/>
    </parent>

    <properties>
        <maven.compiler.source>8</maven.compiler.source>
        <maven.compiler.target>8</maven.compiler.target>
        <spring-cloud.version>Hoxton.SR10</spring-cloud.version>
        <mysql.version>5.1.47</mysql.version>
        <mybatis.version>2.1.1</mybatis.version>
    </properties>

    <!--对子项目进行版本管理-->
    <dependencyManagement>
        <dependencies>
            <!-- springCloud -->
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>${spring-cloud.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
            <!-- mysql驱动 -->
            <dependency>
                <groupId>mysql</groupId>
                <artifactId>mysql-connector-java</artifactId>
                <version>${mysql.version}</version>
            </dependency>
            <!--mybatis-->
            <dependency>
                <groupId>org.mybatis.spring.boot</groupId>
                <artifactId>mybatis-spring-boot-starter</artifactId>
                <version>${mybatis.version}</version>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <!--对所有的子项目都生效，子项目不需要再次引入了-->
    <dependencies>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
        </dependency>
    </dependencies>

</project>

10、子工程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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <parent>
        <artifactId>demo</artifactId>
        <groupId>org.example</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>order-service</artifactId>

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

    <!--这里的版本都是父工程统一管理-->
    <dependencies>
        <!--spring-boot-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>


        <!--测试-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>
        <!--mybatis-->
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
        </dependency>
    </dependencies>
</project>

四、子工程创建Spring Boot的目录结构

11、选中子工程的src文件，右键选择New——》Directory 

12、Ctrl+左键，选中这四个，点击Enter，创建Spring Boot的目录结构

 12、创建完成的目录结构

 13、包的完整目录结构

启动主函数：OrderServiceApplication 

package com.example;

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

@SpringBootApplication
public class OrderServiceApplication {

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

resources文件夹创建： application.properties、static、templates

配置文件：application.properties

server.port=8081

spring.datasource.url=jdbc:mysql://localhost:3306/cloud_user?useSSL=false
spring.datasource.username=root
spring.datasource.password=123456
spring.datasource.driver-class-name=com.mysql.jdbc.Driver

mybatis.type-aliases-package=com.example.pojo
mybatis.configuration.map-underscore-to-camel-case=true

logging.level.com.example=debug

测试主函数：OrderServiceApplicationTests 

package com.example;


import org.junit.jupiter.api.Test;
import org.springframework.boot.test.context.SpringBootTest;

@SpringBootTest
public class OrderServiceApplicationTests {

    @Test
    void contextLoads() {
        System.out.println("==========");
    }
}