该篇文章项目地址https://gitee.com/gtfgtf/ttchrcgx.git day01分支 使用 IDEA 创建一个空 JAVA8 maven 项目
pom.xml 内容如下
代码语言:javascript复制<?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>cn.mrcode</groupId>
<artifactId>foodie-dev</artifactId>
<version>1.0-SNAPSHOT</version>
<properties>
<maven.compiler.source>8</maven.compiler.source>
<maven.compiler.target>8</maven.compiler.target>
</properties>
<!-- 聚合项目-->
<packaging>pom</packaging>
</project>
创建一个 common 模块,它的 pom.xml 内容如下
代码语言:javascript复制<?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>foodie-dev</artifactId>
<groupId>cn.mrcode</groupId>
<version>1.0-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>
<artifactId>foodie-dev-common</artifactId>
<properties>
<maven.compiler.source>8</maven.compiler.source>
<maven.compiler.target>8</maven.compiler.target>
</properties>
<!-- 默认的打包方式是 jar-->
<packaging>jar</packaging>
</project>
那么此时再父工程中的 pom.xml 内容就多了一项
代码语言:javascript复制<modules>
<module>foodie-dev-common</module>
</modules>
简单总结下:
- 聚合工程可以分为顶级项目(顶级工程、父工程)与子工程 两种的关系其实就是父子继承的关系, 子工程在 maven 里称之为模块(module),模块之间是平级,是可以相互依赖的
- 子模块可以使用顶级工程里所有的资源(依赖),子模块之间如果要使用资源,必须构建依赖(构建关系)
- 一个顶级工程是可以由多个不同的子工程共同组合而成 也就是组成了一个可以运行的项目
其余模块构建
● pojo:实体类等信息 ● mapper:mybatis 等信息 ● service:服务层 ● api:controller 层,统称为 API
pojo pom.xml
代码语言:javascript复制<?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>foodie-dev</artifactId>
<groupId>cn.mrcode</groupId>
<version>1.0-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>
<artifactId>foodie-dev-pojo</artifactId>
<properties>
<maven.compiler.source>8</maven.compiler.source>
<maven.compiler.target>8</maven.compiler.target>
</properties>
<dependencies>
<!-- 依赖 common-->
<dependency>
<groupId>cn.mrcode</groupId>
<artifactId>foodie-dev-common</artifactId>
<version>1.0-SNAPSHOT</version>
</dependency>
</dependencies>
</project>
mapper pom.xml
代码语言:javascript复制<?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>foodie-dev</artifactId>
<groupId>cn.mrcode</groupId>
<version>1.0-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>
<artifactId>foodie-dev-mapper</artifactId>
<properties>
<maven.compiler.source>8</maven.compiler.source>
<maven.compiler.target>8</maven.compiler.target>
</properties>
<dependencies>
<dependency>
<groupId>cn.mrcode</groupId>
<artifactId>foodie-dev-pojo</artifactId>
<version>1.0-SNAPSHOT</version>
</dependency>
</dependencies>
</project>
service pom.xml
代码语言:javascript复制<?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>foodie-dev</artifactId>
<groupId>cn.mrcode</groupId>
<version>1.0-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>
<artifactId>foodie-dev-service</artifactId>
<properties>
<maven.compiler.source>8</maven.compiler.source>
<maven.compiler.target>8</maven.compiler.target>
</properties>
<dependencies>
<dependency>
<groupId>cn.mrcode</groupId>
<artifactId>foodie-dev-mapper</artifactId>
<version>1.0-SNAPSHOT</version>
</dependency>
</dependencies>
</project>
api pom.xml
代码语言:javascript复制<?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>foodie-dev</artifactId>
<groupId>cn.mrcode</groupId>
<version>1.0-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>
<artifactId>foodie-dev-api</artifactId>
<properties>
<maven.compiler.source>8</maven.compiler.source>
<maven.compiler.target>8</maven.compiler.target>
</properties>
<dependencies>
<dependency>
<groupId>cn.mrcode</groupId>
<artifactId>foodie-dev-service</artifactId>
<version>1.0-SNAPSHOT</version>
</dependency>
</dependencies>
</project>
最后,顶级的 pom.xml 文件就变成如下的配置了
代码语言:javascript复制<?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>cn.mrcode</groupId>
<artifactId>foodie-dev</artifactId>
<version>1.0-SNAPSHOT</version>
<modules>
<module>foodie-dev-common</module>
<module>foodie-dev-pojo</module>
<module>foodie-dev-mapper</module>
<module>foodie-dev-service</module>
<module>foodie-dev-api</module>
</modules>
<properties>
<maven.compiler.source>8</maven.compiler.source>
<maven.compiler.target>8</maven.compiler.target>
</properties>
<!-- 聚合项目-->
<packaging>pom</packaging>
</project>
那么总结的来看:
● common:通用信息 ● pojo:实体类等信息 ● mapper:mybatis 等信息 ● service:服务层 ● api:controller 层,统称为 API
以上是以模块的方式将层分开了,而笔者平时的写法是这些模块都在一个项目中。api 虽然通过依赖传递关系,可以使用前面所有模块的资源,但是记住一个点 : 不要跨层调用(除了 common)