maven 依赖的传递性

1.如图我们有三个项目，项目Age，项目Bge，项目Cge

2.我们使Age项目依赖到Bge项目,Bge项目依赖到Cge项目

Age项目和Bge项目分别执行命令：mvn install  打包*.jar包，且放到本地仓库中

配置项目Bge的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>

  <groupId>com.imooc.Bge</groupId>
  <artifactId>Bge</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <packaging>jar</packaging>

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

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

  <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>3.8.1</version>
      <scope>test</scope>
    </dependency>
     <dependency>
      <groupId>com.imooc.Age</groupId>
      <artifactId>Age</artifactId>
      <version>0.0.1-SNAPSHOT</version>
    </dependency>
    
  </dependencies>
</project>

配置项目Cge的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>

  <groupId>com.imooc.Cge</groupId>
  <artifactId>Cge</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <packaging>jar</packaging>

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

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

  <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>3.8.1</version>
      <scope>test</scope>
    </dependency>
    <dependency>
     <groupId>com.imooc.Bge</groupId>
      <artifactId>Bge</artifactId>
      <version>0.0.1-SNAPSHOT</version>
    </dependency>
  </dependencies>
</project>

发现maven依赖如下图：

 证实maven的依赖拥有传递性质！

3.阻止maven的依赖性如项目Cge中，不要出现项目Age，那么我们在项目Cge中配置pom.xml如下

项目Cge的xml配置如下：

<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.imooc.Cge</groupId>
  <artifactId>Cge</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <packaging>jar</packaging>

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

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

  <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>3.8.1</version>
      <scope>test</scope>
    </dependency>
    <dependency>
     <groupId>com.imooc.Bge</groupId>
      <artifactId>Bge</artifactId>
      <version>0.0.1-SNAPSHOT</version>
      <!-- 排除依赖 -->
   <exclusions>
           <exclusion>
            <groupId>com.imooc.Age</groupId>
          <artifactId>Age</artifactId>
           </exclusion>
   </exclusions>
    </dependency>
  </dependencies>
  
  
</project>

项目Cge编译后的效果如下：