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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>