idea创建Springboot多模块项目（聚合项目）

<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/maven-v4_0_0.xsd">

  <!-- 项目基本信息:这里作为聚合工程的父工程 -->
  <modelVersion>4.0.0</modelVersion>
  <groupId>com.qfx</groupId>
  <artifactId>springboot-parentProject</artifactId>
  <!-- packaging要设置为pom -->
  <packaging>pom</packaging>
  <version>1.0-SNAPSHOT</version>
  <name>springboot-parentProject</name>
  <description>这是一个基于Maven的SpringBoot聚合项目父工程示例</description>

  <!-- 继承说明:设置父类,整合第三方常用框架依赖信息(各种依赖信息),这里继承SpringBoot提供的父工程 -->
  <parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.5.4</version>
    <relativePath /> <!-- lookup parent from repository -->
  </parent>

  <!-- 设置公共参数 -->
  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
    <java.version>1.8</java.version>
    <!-- Maven install 时,测试环境@Test中如果有中文输出是乱码，加上这句话试试 -->
    <argLine>-Dfile.encoding=UTF-8</argLine>
  </properties>

  <dependencies>
    <!-- 1.引入springboot核心包,整合SpringMVC Web组件,包含了spring-boot-starter -->
    <!-- 实现原理：Maven依赖继承关系,相当于把第三方常用Maven依赖信息,在parent项目中已经封装好了 -->
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-web</artifactId>
    </dependency>

    <!-- 2.引入SpringBoot测试场景启动器 -->
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-test</artifactId>
      <scope>test</scope>
    </dependency>
  </dependencies>

  <build>
    <!-- 指定war包或jar包名称,以此处为准,否则会带上版本号 -->
    <finalName>${project.name}</finalName>
    <plugins>
      <plugin>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-maven-plugin</artifactId>
      </plugin>
    </plugins>
  </build>

</project>

<"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">

    <!-- 项目基本信息:这里作为聚合工程的子工程 -->
    <modelVersion>4.0.0</modelVersion>
    <artifactId>springboot-child01</artifactId>
    <!-- 打包方式设置为jar,默认jar(可不设置) -->
    <packaging>jar</packaging>
    <description>这是一个基于Maven的SpringBoot聚合项目子工程示例</description>

    <!-- 设置父类,,这里继承springboot-parentProject父工程 -->
    <parent>
        <groupId>com.qfx</groupId>
        <artifactId>springboot-parentProject</artifactId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    
</project>

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

@SpringBootApplication
public class RunAppChild01 {
    public static void main(String[] args) {
        SpringApplication.run(RunAppChild01.class, args);
    }
}

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

@RestController
@RequestMapping("test01")
public class TestController {

    @RequestMapping("hello")
    public String hello() {
        return "Hello world!";
    }
}