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一、创建一个父模块

不需要添加什么springweb，创建好之后是这样子的，有这些文件

删掉 .mvn，src，HELP.md，mvnw，mvnw.cmd

最原始的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>3.4.3</version><relativePath/> <!-- lookup parent from repository --></parent><groupId>org.example</groupId><artifactId>owntestdemo</artifactId><version>0.0.1-SNAPSHOT</version><name>owntestdemo</name><description>owntestdemo</description><url/><licenses><license/></licenses><developers><developer/></developers><scm><connection/><developerConnection/><tag/><url/></scm><properties><java.version>21</java.version></properties><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></dependency></dependencies><build><plugins><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId></plugin></plugins></build></project>

打开pom.xml，需要删掉<build>标签下面的

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

删掉<parent>标签

    <parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>3.4.3</version><relativePath/> <!-- lookup parent from repository --></parent>

删掉<name>和<description>标签

    <name>owntestdemo</name><description>owntestdemo</description>

删除<dependencies>标签

    <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></dependency></dependencies>

标签<dependencyManagement>来管理依赖

    <dependencyManagement><dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-dependencies</artifactId><version>${spring-boot.version}</version></dependency></dependencies></dependencyManagement>

在<properties>中添加<spring-boot.version>

<spring-boot.version>3.4.3</spring-boot.version>

添加<packaging>，因为外层只是管理依赖的一个文件

<packaging>pom</packaging>

添加<build>标签

    <build><plugins><plugin><groupId>org.apache.maven.plugins</groupId><artifactId>maven-compiler-plugin</artifactId><configuration><source>${maven.compiler.source}</source><target>${maven.compiler.target}</target><encoding>${project.build.sourceEncoding}</encoding></configuration></plugin></plugins><pluginManagement><plugins><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugine</artifactId><version>${spring.boot.version}</version><executions><execution><goals><goal>repackage</goal></goals></execution></executions></plugin></plugins></pluginManagement></build>

在<properties>里面添加<maven.compiler.source>、<maven.compiler.source>、<maven.compiler.source>

    <properties><maven.compiler.source>17</maven.compiler.source><maven.compiler.source>17</maven.compiler.target><maven.compiler.source>UTF-8</project.build.sourceEncoding></properties>

最后pom.xml的样子

<?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>org.example</groupId><artifactId>owntestdemo</artifactId><version>0.0.1-SNAPSHOT</version><packaging>pom</packaging><url/><licenses><license/></licenses><developers><developer/></developers><scm><connection/><developerConnection/><tag/><url/></scm><properties><maven.compiler.source>17</maven.compiler.source><maven.compiler.target>17</maven.compiler.target><project.build.sourceEncoding>UTF-8</project.build.sourceEncoding><java.version>21</java.version><spring-boot.version>3.4.3</spring-boot.version></properties><dependencyManagement><dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-dependencies</artifactId><version>${spring-boot.version}</version></dependency></dependencies></dependencyManagement><build><plugins><plugin><groupId>org.apache.maven.plugins</groupId><artifactId>maven-compiler-plugin</artifactId><configuration><source>${maven.compiler.source}</source><target>${maven.compiler.target}</target><encoding>${project.build.sourceEncoding}</encoding></configuration></plugin></plugins><pluginManagement><plugins><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugine</artifactId><version>${spring.boot.version}</version><executions><execution><goals><goal>repackage</goal></goals></execution></executions></plugin></plugins></pluginManagement></build></project>

二、创建子模块

右击owntestdemo项目文件夹 --> New --> Module

选择Spring Boot，创建module-common

点next，spring不用管，也不需要勾选任何springweb等

删掉 .mvn，.gitignore，HELP.md，mvnw，mvnw.cmd

删除后

module-common原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>3.4.3</version><relativePath/> <!-- lookup parent from repository --></parent><groupId>org.example</groupId><artifactId>module-common</artifactId><version>0.0.1-SNAPSHOT</version><name>module-common</name><description>module-common</description><url/><licenses><license/></licenses><developers><developer/></developers><scm><connection/><developerConnection/><tag/><url/></scm><properties><java.version>21</java.version></properties><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></dependency></dependencies><build><plugins><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId></plugin></plugins></build></project>

修改<parent>标签中的<groupId>标签

	<parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>3.4.3</version><relativePath/> <!-- lookup parent from repository --></parent>

把子类pom.xml中<parent>标签里面的数值改成父类<project>标签里面的数值

    <groupId>org.example</groupId><artifactId>owntestdemo</artifactId><version>0.0.1-SNAPSHOT</version><packaging>pom</packaging>

子类module-common的pom.xml修改后

	<parent><groupId>org.example</groupId><artifactId>owntestdemo</artifactId><version>0.0.1-SNAPSHOT</version><relativePath/> <!-- lookup parent from repository --></parent>

删除module-common中pom.xml里的<name>标签和<description>标签

原：

	<groupId>org.example</groupId><artifactId>module-common</artifactId><version>0.0.1-SNAPSHOT</version><name>module-common</name><description>module-common</description>

改后：

	<groupId>org.example</groupId><artifactId>module-common</artifactId><version>0.0.1-SNAPSHOT</version>

删除<build>标签

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

删除<dependencies>标签里面的<dependency>标签

		<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></dependency>

在父模块pom.xml中<project>标签下，也就是和<build>等标签同级，添加<modules>标签内容，这个就是模块管理子模块。

    <modules><module>module-common</module></modules>

子模块<dependencies>标签添加<dependency>标签，这个是springweb依赖

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

修改module-common中pom.xml的<parent>标签中的<relativePath>标签，如下

原：

<relativePath/>

改后：

    <parent><groupId>org.example</groupId><artifactId>owntestdemo</artifactId><version>0.0.1-SNAPSHOT</version><relativePath>../pom.xml</relativePath> <!-- lookup parent from repository --></parent>

修改<groupId>标签

原：

    <groupId>org.example</groupId>

改后：

    <groupId>org.example.common</groupId><artifactId>module-common</artifactId><version>0.0.1-SNAPSHOT</version>

需要把父模块中的pom.xml中的<dependencyManagement>标签，添加<type>和<scope>标签。指定类型不然就会有问题。

    <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>

加了<type>和<scope>标签子模块的pom.xml就会出现这个向上的箭头

如果不加<type>和<scope>标签子模块的pom.xml就不会出现这个向上的箭头，就会有问题。

在子模块pom.xml中添加 spring-boot-starter-test 依赖

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

最后

owntestdemo父模块的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><groupId>org.example</groupId><artifactId>owntestdemo</artifactId><version>0.0.1-SNAPSHOT</version><packaging>pom</packaging><url/><licenses><license/></licenses><developers><developer/></developers><scm><connection/><developerConnection/><tag/><url/></scm><properties><maven.compiler.source>17</maven.compiler.source><maven.compiler.target>17</maven.compiler.target><project.build.sourceEncoding>UTF-8</project.build.sourceEncoding><java.version>21</java.version><spring-boot.version>3.4.3</spring-boot.version></properties><dependencyManagement><dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-dependencies</artifactId><version>${spring-boot.version}</version><type>pom</type><scope>import</scope></dependency></dependencies></dependencyManagement><build><plugins><plugin><groupId>org.apache.maven.plugins</groupId><artifactId>maven-compiler-plugin</artifactId><configuration><source>${maven.compiler.source}</source><target>${maven.compiler.target}</target><encoding>${project.build.sourceEncoding}</encoding></configuration></plugin></plugins><pluginManagement><plugins><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugine</artifactId><version>${spring.boot.version}</version><executions><execution><goals><goal>repackage</goal></goals></execution></executions></plugin></plugins></pluginManagement></build><modules><module>module-common</module></modules></project>

module-common 子模块的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.example</groupId><artifactId>owntestdemo</artifactId><version>0.0.1-SNAPSHOT</version><relativePath>../pom.xml</relativePath> <!-- lookup parent from repository --></parent><groupId>org.example.common</groupId><artifactId>module-common</artifactId><version>0.0.1-SNAPSHOT</version><url/><licenses><license/></licenses><developers><developer/></developers><scm><connection/><developerConnection/><tag/><url/></scm><properties><java.version>21</java.version></properties><dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId></dependency></dependencies></project>