maven 继承关系和聚合

maven继承管理让版本的管理只在一个地方改变

modules用于聚合，把执行的项目都放到同一的地方用module包括，可以省去一个个项目去mvn install,这样可以所有项目一次聚合 mvn install

传递性依赖原则：

A-->B
A-->C

1.路径最近者优先
2.路径相同，第一声明者优先

注意：
1.dependencyManagement中定义的依赖子module不会共享
2.dependencies中定义的依赖子module可以共享

dependencyManagement的使用就是方便管理版本,子项目中要引入group id和atifact id

在parent项目的pom.xml配置

 <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.itcast.maven</groupId>

   <artifactId>Parent</artifactId>

   <version>0.0.1-SNAPSHOT</version>

   <packaging>pom</packaging>

   <name>Parent</name>

   <url>http://maven.apache.org</url>

 <!--聚合-->

   <modules>

       <module>../Hello</module>

       <module>../HelloFriend</module>

       <module>../MakeFriends</module>

       <module>../Web</module>

 </modules>

   <properties>

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

   </properties>

 <!--定义了依赖的关系，让其他项目继承这些包，不用写版本，同一控制了-->

   <dependencyManagement>

   <dependencies>

     <dependency>

       <groupId>junit</groupId>

       <artifactId>junit</artifactId>

       <version>4.9</version>

       <scope>test</scope>

     </dependency>

     <dependency>

             <groupId>cn.itcast.maven</groupId>

             <artifactId>Hello</artifactId>

             <version>0.0.1-SNAPSHOT</version>

             <scope>compile</scope>

         </dependency>

     <dependency>

       <groupId>cn.itcast.maven</groupId>

       <artifactId>HelloFriend</artifactId>

       <version>0.0.1-SNAPSHOT</version>

     </dependency>

     <dependency>

       <groupId>cn.itcast.maven</groupId>

       <artifactId>MakeFriends</artifactId>

       <version>0.0.1-SNAPSHOT</version>

     </dependency>

   </dependencies>

   </dependencyManagement>

  <distributionManagement>

     <repository>

         <id>releases</id>

         <name>Internal Releases</name>

         <url>http://localhost:8080/nexus-2.1.2/content/repositories/releases/</url>

     </repository>

     <snapshotRepository>

         <id>snapshots</id>

         <name>Internal Snapshots</name>

         <url>http://localhost:8080/nexus-2.1.2/content/repositories/snapshots/</url>

     </snapshotRepository>

   </distributionManagement>

 </project>

Hello.pom

 <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>

   <artifactId>Hello</artifactId>

   <parent>

           <groupId>cn.itcast.maven</groupId>

      <artifactId>Parent</artifactId>

       <version>0.0.1-SNAPSHOT</version>

         <relativePath>../Parent/pom.xml</relativePath>

 </parent>

 <dependencies>

 <!--不用写版本了  parent那里同一控制了-->

     <dependency>

             <groupId>junit</groupId>

             <artifactId>junit</artifactId>

         </dependency>

 </dependencies>

 </project>

HelloFriend pom.xml

 <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>

   <artifactId>HelloFriend</artifactId>

   <name>HelloFriend</name>

     <parent>

           <groupId>cn.itcast.maven</groupId>

      <artifactId>Parent</artifactId>

       <version>0.0.1-SNAPSHOT</version>

         <relativePath>../Parent/pom.xml</relativePath>

   </parent>

   <dependencies>

     <dependency>

       <groupId>junit</groupId>

       <artifactId>junit</artifactId>

     </dependency>

     <dependency>

             <groupId>cn.itcast.maven</groupId>

             <artifactId>Hello</artifactId>

     </dependency>

     </dependencies>

 </project>

巴特西

maven 继承关系和聚合

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