项目中实际都是多模块项目，没有实际从0到1搭过，

今天实操了一遍，和直接创建一个spring boot项目还是有一定差别的

 spring boot搭建maven多模块，依赖都由父pom来管理，

   子模块需要什么依赖就引入什么依赖，不用管版本号

   且不同模块也可以相互依赖。

先看下搭建后的整体结构

新建Spring Boot项目

不是我们经常选的maven project,而是maven pom

创建子模块

这一次选择Maven

我们把依赖和版本号在父pom中管理起来，

看下我的父pom

<?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>
    <packaging>pom</packaging>
    <modules>
        <module>common</module>
        <module>web</module>
        <module>service</module>
        <module>db</module>
    </modules>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.7.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>pers.wmx</groupId>
    <artifactId>daily-coding</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>daily-coding</name>
    <description>daily-coding</description>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

        <java.version>1.8</java.version>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <maven.compiler.source>${java.version}</maven.compiler.source>
        <maven.compiler.target>${java.version}</maven.compiler.target>

        <mybatis_spring_version>1.3.1</mybatis_spring_version>

        <lombok.version>1.16.20</lombok.version>
        <fastjson_version>1.2.57</fastjson_version>
    </properties>

    <dependencyManagement>
        <!-- 项目全局的依赖版本管理，所有依赖的版本号必须定义在这里 -->
        <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>

            <!-- 所有子模块的版本保持一致 -->
            <dependency>
                <groupId>${project.groupId}</groupId>
                <artifactId>web</artifactId>
                <version>${project.version}</version>
            </dependency>
            <dependency>
                <groupId>${project.groupId}</groupId>
                <artifactId>service</artifactId>
                <version>${project.version}</version>
            </dependency>
            <dependency>
                <groupId>${project.groupId}</groupId>
                <artifactId>common</artifactId>
                <version>${project.version}</version>
            </dependency>

            <dependency>
                <groupId>org.projectlombok</groupId>
                <artifactId>lombok</artifactId>
                <version>${lombok.version}</version>
                <scope>provided</scope>
            </dependency>

            <dependency>
                <groupId>org.mybatis.spring.boot</groupId>
                <artifactId>mybatis-spring-boot-starter</artifactId>
                <version>${mybatis_spring_version}</version>
            </dependency>

            <dependency>
                <groupId>com.alibaba</groupId>
                <artifactId>fastjson</artifactId>
                <version>${fastjson_version}</version>
            </dependency>

        </dependencies>

    </dependencyManagement>

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

</project>

看下common的子pom

<?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">
    <parent>
        <artifactId>daily-coding</artifactId>
        <groupId>pers.wmx</groupId>
        <version>0.0.1-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>common</artifactId>

    <dependencies>

        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
        </dependency>

        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
        </dependency>

    </dependencies>

</project>

儿子需要什么就去老子那拿即可，自己不用操心

东西都在老子那儿

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