maven的聚合模块和pom继承使用-创新互联
1.什么是maven的聚合模块?
聚合模块为项目目录的最顶层,其他模块作为聚合模块子目录而存在。目的是为一次构建多个项目模块。
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我自己化了一个关于项目的关系:
1.2 pom标签配置-module下载
maven-aggregate作为maven pom项目,需要定义pom.xml的 packaging 为 pom类型
我们还是参照 maven的依赖特性,冲突解决(五) 创建 maven-01 maven-02 maven-03工程,通过maven-aggregate pom工程 对这三个maven项目做一个聚合,配置如下:
Xml代码 下载
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
4.0.0 com.sohu.train maven-aggregate 0.0.1-SNAPSHOT pom ../maven-01 ../maven-02 ..maven-03
对 maven-aggregate执行下mvn clean compile
Xml代码 下载
[INFO] Scanning for projects...
[WARNING]
[WARNING] Some problems were encountered while building the effective model for com.sohu.train:maven-02:jar:1.0-SNAPSHORT
[WARNING] 'dependencies.dependency.exclusions.exclusion.groupId' for junit:junit:jar is missing. @ line 38, column 16
[WARNING] 'dependencies.dependency.exclusions.exclusion.artifactId' for junit:junit:jar is missing. @ line 38, column 16
[WARNING]
[WARNING] It is highly recommended to fix these problems because they threaten the stability of your build.
[WARNING]
[WARNING] For this reason, future Maven versions might no longer support building such malformed projects.
[WARNING]
[INFO] ------------------------------------------------------------------------
[INFO] Reactor Build Order: //构建 maven 的反应堆,执行清理 编译的顺序
[INFO]
[INFO] maven-02
[INFO] maven-01
[INFO] maven-03
[INFO] maven-aggregate
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building maven-02 1.0-SNAPSHORT
[INFO] ------------------------------------------------------------------------
[INFO]
[INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ maven-02 ---
[INFO] Deleting E:\train\test\maven-02\target
[INFO]
[INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ maven-02 ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] skip non existing resourceDirectory E:\train\test\maven-02\src\main\resources
[INFO]
[INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ maven-02 ---
[INFO] Changes detected - recompiling the module!
[INFO] Compiling 1 source file to E:\train\test\maven-02\target\classes
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building maven-01 1.0-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO]
[INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ maven-01 ---
[INFO] Deleting E:\train\test\maven-01\target
[INFO]
[INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ maven-01 ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] Copying 1 resource
[INFO]
[INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ maven-01 ---
[INFO] Changes detected - recompiling the module!
[INFO] Compiling 1 source file to E:\train\test\maven-01\target\classes
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building maven-03 0.0.1-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO]
[INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ maven-03 ---
[INFO] Deleting E:\train\test\maven-03\target
[INFO]
[INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ maven-03 ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] skip non existing resourceDirectory E:\train\test\maven-03\src\main\resources
[INFO]
[INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ maven-03 ---
[INFO] Changes detected - recompiling the module!
[INFO] Compiling 1 source file to E:\train\test\maven-03\target\classes
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building maven-aggregate 0.0.1-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO]
[INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ maven-aggregate ---
[INFO] ------------------------------------------------------------------------
[INFO] Reactor Summary: // 可以看到 对3个maven项目 一起执行编译
[INFO]
[INFO] maven-02 ........................................... SUCCESS [ 1.874 s]
[INFO] maven-01 ........................................... SUCCESS [ 0.108 s]
[INFO] maven-03 ........................................... SUCCESS [ 0.158 s]
[INFO] maven-aggregate .................................... SUCCESS [ 0.002 s]
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 2.263 s
[INFO] Finished at: 2016-01-15T14:35:41+08:00
[INFO] Final Memory: 14M/227M
[INFO] ------------------------------------------------------------------------
这样我们就完成 maven对子模块的聚合 ,像我们平常用的dubbo jetty tomcat spring hibernate等等 都是按模块 去开发,一次编译 各个模块都能紧密联系在一起了。我们在平常开发项目也需要适当的去分模块开发,
这是dubbo的子模块,分了很多子模块:下载
2.什么是pom继承?
pom继承是为了抽出重复配置,通常配置在父模块中,为子模块提供使用,这样可以做到“一处声明,处处使用”。
2.1 继承结构
下载
2.2 pom标签配置-parent,*Management
1.常用的pom被继承的元素
Xml代码 下载
groupId :项目组 ID ,项目坐标的核心元素;
version :项目版本,项目坐标的核心元素;
description :项目的描述信息;
properties :自定义的 Maven 属性;
dependencies :项目的依赖配置;
dependencyManagement :醒目的依赖管理配置;
repositories :项目的仓库配置;
build :包括项目的源码目录配置、输出目录配置、插件配置、插件管理配置等;
1.配置maven-aggregate pom文件:
Xml代码 下载
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
4.0.0 com.sohu.train maven-aggregate 0.0.1-SNAPSHOT pom ../maven-01 ../maven-02 ../maven-03 3.8.1 junit junit ${junit.version} test
maven-01,maven-02,maven-03 需要配置parent ,dependencies,同时对junit做一个依赖,3个工程的pom配置如下:
Xml代码 下载
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
4.0.0 com.sohu.train maven-aggregate 0.0.1-SNAPSHOT ../maven-aggregate/pom.xml maven-03 jar junit junit
这样就完成pom的继承,讲公用的jar一次配置,就可以实现多处引用了。
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