如何在Java项目下新建一个子moudle

1. 流程

原有项目

1.1 确认当前项目为 Maven 父模块

从上传的 pom.xml 文件可以看到，这个项目本身是一个独立的 Maven 项目。为了支持子模块，你需要将这个项目改造成父模块。

检查 POM 文件：确保当前项目的 pom.xml 文件中有以下内容：

• <packaging> 设置为 pom（即父模块）。
• 子模块的 <modules> 节点。

<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>com.landinck</groupId><artifactId>tujian-java</artifactId><version>0.0.1</version><packaging>pom</packaging> <!-- 修改为 pom --><modules><!-- 子模块会在这里列出 --></modules><properties><!-- 保持原有内容 --></properties><dependencies><!-- 保持原有内容 --></dependencies>
</project>

1.2 创建子模块目录

在项目根目录下，创建一个新的子模块目录。例如：tujian-service。
在子模块目录中创建一个新的 pom.xml 文件。

1.3 配置子模块的 POM 文件

为子模块定义一个独立的 POM 文件，并将其设置为从父模块继承。

<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><parent><groupId>com.landinck</groupId><artifactId>tujian-java</artifactId><version>0.0.1</version></parent><artifactId>tujian-service</artifactId><name>Tujian Service Module</name><dependencies><!-- 定义该子模块需要的依赖 --></dependencies>
</project>

1.4 在父模块中声明子模块

编辑父模块的 pom.xml 文件，将新建的子模块路径添加到 <modules> 节点中：

<modules><module>tujian-service</module>
</modules>

1.5 构建并验证

回到父模块的根目录，运行以下命令以构建项目：

mvn clean install

1.6 子模块的代码结构

在子模块目录中，按照标准 Maven 项目结构组织代码：

tujian-service
├── src
│   ├── main
│   │   ├── java
│   │   │   └── com/landinck/tujian/service
│   │   └── resources
│   └── test
│       └── java
└── pom.xml

2. 其他项目例子

<?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><parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>2.4.0</version><relativePath/> <!-- lookup parent from repository --></parent><groupId>cn.tedu</groupId><artifactId>straw</artifactId><version>0.0.1-SNAPSHOT</version><name>straw</name><description>Demo project for Spring Boot</description><packaging>pom</packaging><!-- 子项目 --><modules><module>straw-portal</module><module>straw-generator</module><module>straw-resource</module><module>straw-aop</module></modules><properties><java.version>1.8</java.version><mybatis.plus.version>3.3.1</mybatis.plus.version><project.build.sourceEncoding>UTF-8</project.build.sourceEncoding><pagehelper.starter.version>1.3.0</pagehelper.starter.version></properties><dependencyManagement><dependencies><dependency><groupId>com.github.pagehelper</groupId><artifactId>pagehelper-spring-boot-starter</artifactId><version>${pagehelper.starter.version}</version></dependency><dependency><groupId>com.baomidou</groupId><artifactId>mybatis-plus-boot-starter</artifactId><version>${mybatis.plus.version}</version></dependency><dependency><groupId>com.baomidou</groupId><artifactId>mybatis-plus-extension</artifactId><version>${mybatis.plus.version}</version></dependency><dependency><groupId>com.baomidou</groupId><artifactId>mybatis-plus-generator</artifactId><version>${mybatis.plus.version}</version></dependency></dependencies></dependencyManagement>
</project>

<?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>cn.tedu</groupId><artifactId>straw</artifactId><version>0.0.1-SNAPSHOT</version><relativePath/> <!-- lookup parent from repository --></parent><groupId>cn.tedu</groupId><artifactId>straw-portal</artifactId><version>0.0.1-SNAPSHOT</version><name>straw-portal</name><description>Demo project for Spring Boot</description><properties><java.version>1.8</java.version></properties><dependencies><!-- AspectJ --><dependency><groupId>org.aspectj</groupId><artifactId>aspectjrt</artifactId></dependency><!-- Spring AOP --><dependency><groupId>org.springframework</groupId><artifactId>spring-aop</artifactId></dependency><!-- hutool --><dependency><groupId>cn.hutool</groupId><artifactId>hutool-all</artifactId><version>5.8.16</version></dependency><!-- 分页 --><dependency><groupId>com.github.pagehelper</groupId><artifactId>pagehelper-spring-boot-starter</artifactId></dependency><!-- 验证框架 --><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-validation</artifactId></dependency><!-- thymeleaf --><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-thymeleaf</artifactId></dependency><dependency><groupId>org.thymeleaf.extras</groupId><artifactId>thymeleaf-extras-springsecurity5</artifactId></dependency><!-- mybatis-plus --><dependency><groupId>com.baomidou</groupId><artifactId>mybatis-plus-boot-starter</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-freemarker</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter</artifactId></dependency><dependency><groupId>com.baomidou</groupId><artifactId>mybatis-plus-generator</artifactId></dependency><dependency><groupId>com.baomidou</groupId><artifactId>mybatis-plus-extension</artifactId></dependency><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId></dependency><!-- lombok --><dependency><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId></dependency><dependency><groupId>ch.qos.logback</groupId><artifactId>logback-classic</artifactId><version>1.2.3</version></dependency><!-- Spring Security --><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-security</artifactId></dependency><!-- Spring Security Test --><dependency><groupId>org.springframework.security</groupId><artifactId>spring-security-test</artifactId><scope>test</scope></dependency><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><scope>test</scope></dependency><!-- swagger2 --><dependency><groupId>io.springfox</groupId><artifactId>springfox-swagger2</artifactId><version>2.9.2</version></dependency><dependency><groupId>io.springfox</groupId><artifactId>springfox-swagger-ui</artifactId><version>2.9.2</version></dependency></dependencies><build><plugins><!-- SpringBoot打包工具 --><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId></plugin></plugins></build>
</project>