Maven中的继承和聚合

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一. 继承和聚合

1. 什么是继承？

maven为了消除重复，把很多相同的配置提取出来, 放入一个父项目的pom.xml中
例如：grouptId，version等

2. 什么是聚合？

如果我们想一次构建多个项目模块，那我们就需要对多个项目模块进行聚合
<modules>

</modules>

3. 继承与聚合的关系
继承主要为了消除重复

聚合主要为了快速构建项目

二. 继承聚合配置

1. 聚合配置代码:

<modules><module>../Hello</module><module>../HelloFriend</module><module>../MakeFriends</module></modules>

其中module的路径为相对路径。

2. 继承配置代码:

Parent项目(父):

<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.zdp.maven</groupId><artifactId>Parent</artifactId><version>0.0.1-SNAPSHOT</version><packaging>pom</packaging><name>Parent</name><url>http://maven.apache.org</url><properties><project.build.sourceEncoding>UTF-8</project.build.sourceEncoding></properties><modules><module>../Hello</module><module>../HelloFriend</module><module>../MakeFriends</module></modules><dependencyManagement><dependencies><dependency><groupId>junit</groupId><artifactId>junit</artifactId><version>4.9</version><scope>test</scope></dependency><dependency><groupId>com.zdp.maven</groupId><artifactId>Hello</artifactId><version>0.0.1-SNAPSHOT</version><scope>compile</scope></dependency><dependency><groupId>com.zdp.maven</groupId><artifactId>HelloFriend</artifactId><version>0.0.1-SNAPSHOT</version><scope>compile</scope></dependency></dependencies></dependencyManagement></project>

父模块中将用dependencyManagement进行管理

MakeFriends项目(子):

<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>MakeFriends</artifactId><packaging>jar</packaging><name>MakeFriends</name><parent><groupId>com.zdp.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>com.zdp.maven</groupId><artifactId>HelloFriend</artifactId></dependency></dependencies></project>

HelloFriend项目(子):

<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><packaging>jar</packaging><name>HelloFriend</name><parent><groupId>com.zdp.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>com.zdp.maven</groupId><artifactId>Hello</artifactId></dependency></dependencies></project>

Hello项目(子):

<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><packaging>jar</packaging><name>Hello</name><parent><groupId>com.zdp.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></dependencies></project>

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