创建模块

为刚建好的项目Multi，增加若干模块：

• api模块：存放Controller以及相关代码
• service模块：存放Service以及相关代码
• mapper模块：存放Mapper以及相关代码
• entity模块：存放Entity以及相关代码

1. 新建api模块

在项目名上右键，依次点击 新建 > 新模块

输入模块名称：api，语言选择Java，构建系统选Maven，父项选择Multi，然后点击“创建”

新建完api模块后，项目结构如下图：

2. 新建其他模块

同样的方法依次新建其他3个模块，建完之后目录结构如下图：

3. 删除无用代码

⑴ 删除父模块的src文件夹

⑵ 删除各个子模块的Main.java和.gitignore

4. 修改父模块的pom.xml

修改之后如下文所示

<?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>2.7.14</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <groupId>com.example</groupId>
    <artifactId>Multi</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>pom</packaging>
    <name>Multi</name>
    <description>Multi</description>
    
    <modules>
        <module>api</module>
        <module>service</module>
        <module>mapper</module>
        <module>entity</module>
    </modules>

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

5. 修改api模块的pom.xml

修改之后如下文所示

<?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>
    <parent>
        <groupId>com.example</groupId>
        <artifactId>Multi</artifactId>
        <version>0.0.1-SNAPSHOT</version>
    </parent>

    <groupId>org.example</groupId>
    <artifactId>api</artifactId>

    <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>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.example</groupId>
            <artifactId>service</artifactId>
            <version>0.0.1-SNAPSHOT</version>
        </dependency>
    </dependencies>

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

</project>

5. 修改service模块的pom.xml

修改之后如下文所示

<?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>
    <parent>
        <groupId>com.example</groupId>
        <artifactId>Multi</artifactId>
        <version>0.0.1-SNAPSHOT</version>
    </parent>

    <groupId>org.example</groupId>
    <artifactId>service</artifactId>

    <dependencies>
        <dependency>
            <groupId>org.example</groupId>
            <artifactId>mapper</artifactId>
            <version>0.0.1-SNAPSHOT</version>
        </dependency>
    </dependencies>

</project>

6. 修改mapper模块的pom.xml

修改之后如下文所示

<?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>
    <parent>
        <groupId>com.example</groupId>
        <artifactId>Multi</artifactId>
        <version>0.0.1-SNAPSHOT</version>
    </parent>

    <groupId>org.example</groupId>
    <artifactId>mapper</artifactId>

    <dependencies>
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>2.2.2</version>
        </dependency>
        <dependency>
            <groupId>com.mysql</groupId>
            <artifactId>mysql-connector-j</artifactId>
            <version>8.0.31</version>
        </dependency>
        <dependency>
            <groupId>org.example</groupId>
            <artifactId>entity</artifactId>
            <version>0.0.1-SNAPSHOT</version>
        </dependency>
    </dependencies>

</project>

7. 修改entity模块的pom.xml

修改之后如下文所示

<?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>
    <parent>
        <groupId>com.example</groupId>
        <artifactId>Multi</artifactId>
        <version>0.0.1-SNAPSHOT</version>
    </parent>

    <groupId>org.example</groupId>
    <artifactId>entity</artifactId>

</project>