Maven----模块化开发

我们可以将模块划分为如下形式：

• 统一的依赖管理（dependencies）
• 通用的工具类（commons）
• 领域模型（domain）
• 管理后台（admin）
• 商城前端（ui）
• 接口模块（api）

my-shop 工程的 pom.xml文件如下

注意：<packaging>pom</packaging>  管理模块，主要作用是管理整个工程的全部模块(管理每一个项目)，当有新模块加入时需要在 modules 元素下配置对应的模块目录

<?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>

    <groupId>com.funtl</groupId>
    <artifactId>my-shop</artifactId>
    <version>1.0.0-SNAPSHOT</version>
    <packaging>pom</packaging>
    
    <modules>
    
    </modules>
</project>

 该项目称之为 Root 项目，主要作用是管理整个工程的全部模块，当有新模块加入时需要在 modules 元素下配置对应的模块目录

创建统一的依赖管理

在my-shop工程目录下创建一个名为 my-shop-dependencies 的项目，pom.xml 文件如下：

<?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.funtl</groupId>
        <artifactId>my-shop</artifactId>
        <version>1.0.0-SNAPSHOT</version>
        <relativePath>../pom.xml</relativePath>
    </parent>

    <artifactId>my-shop-dependencies</artifactId>
    <packaging>pom</packaging>

    <name>my-shop-dependencies</name>
    <description></description>

    <properties>
        <!-- 环境配置 -->
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>

        <!-- 统一的依赖管理 -->
        <commons-lang3.version>3.5</commons-lang3.version>
        <jstl.version>1.2</jstl.version>
        <log4j.version>1.2.17</log4j.version>
        <servlet-api.version>3.1.0</servlet-api.version>
        <slf4j.version>1.7.25</slf4j.version>
        <spring.version>4.3.17.RELEASE</spring.version>
    </properties>

    <dependencyManagement>
        <dependencies>
            <!-- Spring Begin -->
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-context</artifactId>
                <version>${spring.version}</version>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-webmvc</artifactId>
                <version>${spring.version}</version>
            </dependency>
            <!-- Spring End -->

            <!-- Servlet Begin -->
            <dependency>
                <groupId>javax.servlet</groupId>
                <artifactId>javax.servlet-api</artifactId>
                <version>${servlet-api.version}</version>
                <scope>provided</scope>
            </dependency>
            <dependency>
                <groupId>javax.servlet</groupId>
                <artifactId>jstl</artifactId>
                <version>${jstl.version}</version>
            </dependency>
            <!-- Servlet End -->

            <!-- Log Begin -->
            <dependency>
                <groupId>org.slf4j</groupId>
                <artifactId>slf4j-api</artifactId>
                <version>${slf4j.version}</version>
            </dependency>
            <dependency>
                <groupId>org.slf4j</groupId>
                <artifactId>slf4j-log4j12</artifactId>
                <version>${slf4j.version}</version>
            </dependency>
            <dependency>
                <groupId>org.slf4j</groupId>
                <artifactId>jcl-over-slf4j</artifactId>
                <version>${slf4j.version}</version>
            </dependency>
            <dependency>
                <groupId>org.slf4j</groupId>
                <artifactId>jul-to-slf4j</artifactId>
                <version>${slf4j.version}</version>
            </dependency>
            <dependency>
                <groupId>log4j</groupId>
                <artifactId>log4j</artifactId>
                <version>${log4j.version}</version>
            </dependency>
            <!-- Log End -->

            <!-- Commons Begin -->
            <dependency>
                <groupId>org.apache.commons</groupId>
                <artifactId>commons-lang3</artifactId>
                <version>${commons-lang3.version}</version>
            </dependency>
            <!-- Commons End -->
        </dependencies>
    </dependencyManagement>

    <build>
        <plugins>
            <!-- Compiler 插件, 设定 JDK 版本 -->
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.7.0</version>
                <configuration>
                    <source>${java.version}</source>
                    <target>${java.version}</target>
                    <encoding>${project.build.sourceEncoding}</encoding>
                    <showWarnings>true</showWarnings>
                </configuration>
            </plugin>
        </plugins>

        <!-- 资源文件配置, javac不会讲资源文件打包-->
        <resources>
            <resource>
                <directory>src/main/java</directory>
                <excludes>
                    <exclude>**/*.java</exclude>
                </excludes>
            </resource>
            <resource>
                <directory>src/main/resources</directory>
            </resource>
        </resources>
    </build>
</project>

PS：别忘记在 my-shop 工程的 pom.xml 中增加 <module>my-shop-dependencies</module> 配置

创建通用的工具类

在my-shop工程目录下创建名为 my-shop-commons 的项目，pom.xml 文件如下：

<?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.zy</groupId>
        <artifactId>my-shop-dependencies</artifactId>
        <version>1.0.0-SNAPSHOT</version>
        <relativePath>../my-shop-dependencies/pom.xml</relativePath>
    </parent>

    <artifactId>my-shop-commons</artifactId>
    <packaging>jar</packaging>

    <name>my-shop-commons</name>
    <description></description>

    <!--忽略了版本号,my-shop-dependencies已经控制了版本的管理-->
    <dependencies>
        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-lang3</artifactId>
        </dependency>
    </dependencies>

</project>

PS：别忘记在 my-shop 工程的 pom.xml 中增加 <module>my-shop-commons</module> 配置

创建领域模型

在my-shop工程目录下创建一个名为 my-shop-domain 的项目，pom.xml 文件如下：

<?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.funtl</groupId>
        <artifactId>my-shop-dependencies</artifactId>
        <version>1.0.0-SNAPSHOT</version>
        <relativePath>../my-shop-dependencies/pom.xml</relativePath>
    </parent>

    <artifactId>my-shop-domain</artifactId>
    <packaging>jar</packaging>

    <name>my-shop-domain</name>
    <description></description>

</project>

PS：别忘记在 my-shop 工程的 pom.xml 中增加 <module>my-shop-domain</module> 配置

创建管理后台

在my-shop工程目录下创建一个名为 my-shop-web-admin 的项目，pom.xml 文件如下：

<?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.funtl</groupId>
        <artifactId>my-shop-dependencies</artifactId>
        <version>1.0.0-SNAPSHOT</version>
        <relativePath>../my-shop-dependencies/pom.xml</relativePath>
    </parent>

    <artifactId>my-shop-web-admin</artifactId>
    <packaging>war</packaging>

    <name>my-shop-web-admin</name>
    <description></description>

    <dependencies>
        <dependency>
            <groupId>com.funtl</groupId>
            <artifactId>my-shop-commons</artifactId>
            <version>${project.parent.version}</version>
        </dependency>
        <dependency>
            <groupId>com.funtl</groupId>
            <artifactId>my-shop-domain</artifactId>
            <version>${project.parent.version}</version>
        </dependency>
    </dependencies>

</project>

PS：别忘记在 my-shop 工程的 pom.xml 中增加 <module>my-shop-web-ui</module> 配置

创建接口模块

在my-shop工程目录下创建一个名为 my-shop-web-api 的项目，pom.xml 文件如下：

<?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.funtl</groupId>
        <artifactId>my-shop-dependencies</artifactId>
        <version>1.0.0-SNAPSHOT</version>
        <relativePath>../my-shop-dependencies/pom.xml</relativePath>
    </parent>

    <artifactId>my-shop-web-api</artifactId>
    <packaging>war</packaging>

    <name>my-shop-web-api</name>
    <description></description>

    <dependencies>
        <dependency>
            <groupId>com.funtl</groupId>
            <artifactId>my-shop-commons</artifactId>
            <version>${project.parent.version}</version>
        </dependency>
    </dependencies>

</project>

PS：别忘记在 my-shop 工程的 pom.xml 中增加 <module>my-shop-web-api</module> 配置

清理、编译、打包

至此一个完整的模块化工程创建完毕，此时的 Root 工程 pom.xml 文件如下：

<?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>

    <groupId>com.funtl</groupId>
    <artifactId>my-shop</artifactId>
    <version>1.0.0-SNAPSHOT</version>
    <packaging>pom</packaging>

    <modules>
        <module>my-shop-dependencies</module>
        <module>my-shop-commons</module>
        <module>my-shop-domain</module>
        <module>my-shop-web-admin</module>
        <module>my-shop-web-ui</module>
        <module>my-shop-web-api</module>
    </modules>
</project>

我们可以在 Root 工程中使用 Maven 提供的 mvn clean 命令测试一下效果

检查环境是否有问题

mvn clean package -Dmaven.test.skip=true