本篇涉及到的内容属于神技能,多数使用maven的人都经常想要的一种功能,但是大多数人都不知道如何使用,废话不多说,上干货。
我们需要做一个电商项目,一般都会做成微服务的形式,按业务进行划分,本次我们主要以账户业务和订单业务为例,我们将这两块业务分别作为2个大的模块来开发,而订单模块又会调用账户模块中的接口,所以对账户模块接口部分会有依赖。
我们以maven来搭建项目,项目的目录结构如下:
- b2b
- b2b-account
- b2b-account-api
- b2b-account-service
- b2b-order
- b2b-order-api
- b2b-order-service
账户模块,其中包含2个小模块:b2b-account-api和b2b-account-service
账户模块对外暴露的接口部分,以供外部调用
账户模块具体业务实现,依赖于b2b-account-api
模块
订单模块,也是包含2个小模块:b2b-order-api和b2b-order-service
订单模块对外暴露的接口部分,以供外部调用
订单模块具体业务实现,依赖2个模块b2b-order-api、b2b-account-api
我们按照上面的需求,使用maven搭建项目结构,具体过程如下。
打开idea,点击File->New->Project
,如下图:
选择Maven
,如下图:
点击上图的Next
,输入坐标信息,如下图:
点击上图的Next
,输入Project Name
为b2b
,如下图:
点击上图的Finish
,完成项目的创建,如下图:
删除下图中无用的代码:
变成了下面这样:
配置一下idea的maven环境,点击File->Settings
,如下图:
点击上面的OK
完成配置。
注意这里是创建模块,不是项目了,注意下面的操作过程。
选中b2b项目目录,如下图:
点击File->New->Module
,如下图:
选择Maven
,如下图:
点击Next
,如下图:
点击上面第二个...
,将Parent置为None
,如下图:
输入坐标信息,如下图:
点击上图中的Next
,输入Project name
为b2b-account
,如下图:
点击Finish
,完成b2b-account
模块的创建,如下图:
删除b2b-account
中src
目录,如下图:
项目结构变成了下面这样:
选中b2b-account
,如下图:
点击File->New->Module
,如下图:
选择Maven
,如下图:
点击上图中的Next
,如下图:
将上面的Add as module to
设置为b2b-account
模块,表示新增的这个模块被b2b-account
聚合进行管理。
点击Parent
后面的...
,选择None
,将Parent
对应的值置为None
。
如下图:
输入坐标信息,如下图:
点击Next
,默认如下图:
我们需要对上面3个输入框的值进行修改,修改成下面这样:
点击Finish
,完成创建,如下图:
这个过程参考在b2b-account模块下面创建b2b-account-api模块
。
这个过程参考在b2b下创建b2b-account模块
。
这个过程参考在b2b-account模块下面创建b2b-account-api模块
。
这个过程参考在b2b-account模块下面创建b2b-account-api模块
。
上面都创建成功之后,项目结构如下图
参与过大型maven项目开发的是不是很熟悉很亲切,多数互联网项目的maven结构就是这样一大片maven模块。
b2b-account-service依赖于b2b-account-api
模块,所以在b2b-account-service/pom.xml
中加入下面配置:
- <dependencies>
- <dependency>
- <groupId>${project.groupId}</groupId>
- <artifactId>b2b-account-api</artifactId>
- <version>${project.version}</version>
- </dependency>
- </dependencies>
由于项目的
groupId,version
都是一样的,所以直接通过${}
这种方式引用了。
b2b-order-service依赖2个模块b2b-order-api、b2b-account-api
,所以在b2b-order-service/pom.xml
中加入下面配置:
- <dependencies>
- <dependency>
- <groupId>${project.groupId}</groupId>
- <artifactId>b2b-account-api</artifactId>
- <version>${project.version}</version>
- </dependency>
- <dependency>
- <groupId>${project.groupId}</groupId>
- <artifactId>b2b-order-api</artifactId>
- <version>${project.version}</version>
- </dependency>
- </dependencies>
- <?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>com.javacode2018</groupId>
- <artifactId>b2b</artifactId>
- <packaging>pom</packaging>
- <version>1.0-SNAPSHOT</version>
- <modules>
- <module>b2b-account</module>
- <module>b2b-order</module>
- </modules>
-
- </project>
- <?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>com.javacode2018</groupId>
- <artifactId>b2b-account</artifactId>
- <packaging>pom</packaging>
- <version>1.0-SNAPSHOT</version>
- <modules>
- <module>b2b-account-api</module>
- <module>b2b-account-service</module>
- </modules>
-
- </project>
- <?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>com.javacode2018</groupId>
- <artifactId>b2b-account-api</artifactId>
- <version>1.0-SNAPSHOT</version>
-
- </project>
- <?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>com.javacode2018</groupId>
- <artifactId>b2b-account-service</artifactId>
- <version>1.0-SNAPSHOT</version>
-
- <dependencies>
- <dependency>
- <groupId>${project.groupId}</groupId>
- <artifactId>b2b-account-api</artifactId>
- <version>${project.version}</version>
- </dependency>
- </dependencies>
-
- </project>
- <?xml version="1.0" encoding="UTF-8"?>
- <project xmlns="http://maven.apache.org/POM/4.0.0"
- xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
- xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
- <modelVersion>4.0.0</modelVersion>
-
- <groupId>com.javacode2018</groupId>
- <artifactId>b2b-order</artifactId>
- <packaging>pom</packaging>
- <version>1.0-SNAPSHOT</version>
- <modules>
- <module>b2b-order-api</module>
- <module>b2b-order-service</module>
- </modules>
-
- </project>
- <?xml version="1.0" encoding="UTF-8"?>
- <project xmlns="http://maven.apache.org/POM/4.0.0"
- xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
- xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
- <modelVersion>4.0.0</modelVersion>
-
- <groupId>com.javacode2018</groupId>
- <artifactId>b2b-order-api</artifactId>
- <version>1.0-SNAPSHOT</version>
-
- </project>
- <?xml version="1.0" encoding="UTF-8"?>
- <project xmlns="http://maven.apache.org/POM/4.0.0"
- xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
- xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
- <modelVersion>4.0.0</modelVersion>
-
- <groupId>com.javacode2018</groupId>
- <artifactId>b2b-order-service</artifactId>
- <version>1.0-SNAPSHOT</version>
-
- <dependencies>
- <dependency>
- <groupId>${project.groupId}</groupId>
- <artifactId>b2b-account-api</artifactId>
- <version>${project.version}</version>
- </dependency>
- <dependency>
- <groupId>${project.groupId}</groupId>
- <artifactId>b2b-order-api</artifactId>
- <version>${project.version}</version>
- </dependency>
- </dependencies>
-
- </project>
注意:上面项目的结构属于父子结构,使用maven中聚合的方式进行管理的,对应聚合不是太了解的,可以看上篇文章有详细介绍。
b2b中包含了2个子模块
b2b_account
和b2b_order
,这3个package都是pom。b2b_account中包含了2个子模块,2个子模块package是默认的jar类型。
b2b_order中包含了2个子模块,2个子模块package是默认的jar类型。
上面项目都开发好了,我们需要安装到本地仓库,一般情况下,我们会这么做,在b2b/pom.xml
所在目录执行下面命令:
mvn clean install
我们来感受一下这个命令的效果:
- D:\code\IdeaProjects\b2b>mvn clean install
- [INFO] Scanning for projects...
- [INFO] ------------------------------------------------------------------------
- [INFO] Reactor Build Order:
- [INFO]
- [INFO] b2b-account-api [jar]
- [INFO] b2b-account-service [jar]
- [INFO] b2b-account [pom]
- [INFO] b2b-order-api [jar]
- [INFO] b2b-order-service [jar]
- [INFO] b2b-order [pom]
- [INFO] b2b [pom]
- [INFO]
- [INFO] ------------------< com.javacode2018:b2b-account-api >------------------
- [INFO] Building b2b-account-api 1.0-SNAPSHOT [1/7]
- [INFO] --------------------------------[ jar ]---------------------------------
- [INFO]
- [INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ b2b-account-api ---
- [INFO] Deleting D:\code\IdeaProjects\b2b\b2b-account\b2b-account-api\target
- [INFO]
- [INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ b2b-account-api ---
- [WARNING] Using platform encoding (GBK actually) to copy filtered resources, i.e. build is platform dependent!
- [INFO] Copying 0 resource
- [INFO]
- [INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ b2b-account-api ---
- [INFO] Nothing to compile - all classes are up to date
- [INFO]
- [INFO] --- maven-resources-plugin:2.6:testResources (default-testResources) @ b2b-account-api ---
- [WARNING] Using platform encoding (GBK actually) to copy filtered resources, i.e. build is platform dependent!
- [INFO] skip non existing resourceDirectory D:\code\IdeaProjects\b2b\b2b-account\b2b-account-api\src\test\resources
- [INFO]
- [INFO] --- maven-compiler-plugin:3.1:testCompile (default-testCompile) @ b2b-account-api ---
- [INFO] Nothing to compile - all classes are up to date
- [INFO]
- [INFO] --- maven-surefire-plugin:2.12.4:test (default-test) @ b2b-account-api ---
- [INFO] No tests to run.
- [INFO]
- [INFO] --- maven-jar-plugin:2.4:jar (default-jar) @ b2b-account-api ---
- [INFO] Building jar: D:\code\IdeaProjects\b2b\b2b-account\b2b-account-api\target\b2b-account-api-1.0-SNAPSHOT.jar
- [INFO]
- [INFO] --- maven-install-plugin:2.4:install (default-install) @ b2b-account-api ---
- [INFO] Installing D:\code\IdeaProjects\b2b\b2b-account\b2b-account-api\target\b2b-account-api-1.0-SNAPSHOT.jar to C:\Users\Think\.m2\repository\com\javacode2018\b2b-account-api\1.0-SNAPSHOT\b2b-account-api-1.0-SNAPSHOT.jar
- [INFO] Installing D:\code\IdeaProjects\b2b\b2b-account\b2b-account-api\pom.xml to C:\Users\Think\.m2\repository\com\javacode2018\b2b-account-api\1.0-SNAPSHOT\b2b-account-api-1.0-SNAPSHOT.pom
- [INFO]
- [INFO] ----------------< com.javacode2018:b2b-account-service >----------------
- [INFO] Building b2b-account-service 1.0-SNAPSHOT [2/7]
- [INFO] --------------------------------[ jar ]---------------------------------
- [INFO]
- [INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ b2b-account-service ---
- [INFO] Deleting D:\code\IdeaProjects\b2b\b2b-account\b2b-account-service\target
- [INFO]
- [INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ b2b-account-service ---
- [WARNING] Using platform encoding (GBK actually) to copy filtered resources, i.e. build is platform dependent!
- [INFO] Copying 0 resource
- [INFO]
- [INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ b2b-account-service ---
- [INFO] Nothing to compile - all classes are up to date
- [INFO]
- [INFO] --- maven-resources-plugin:2.6:testResources (default-testResources) @ b2b-account-service ---
- [WARNING] Using platform encoding (GBK actually) to copy filtered resources, i.e. build is platform dependent!
- [INFO] skip non existing resourceDirectory D:\code\IdeaProjects\b2b\b2b-account\b2b-account-service\src\test\resources
- [INFO]
- [INFO] --- maven-compiler-plugin:3.1:testCompile (default-testCompile) @ b2b-account-service ---
- [INFO] Nothing to compile - all classes are up to date
- [INFO]
- [INFO] --- maven-surefire-plugin:2.12.4:test (default-test) @ b2b-account-service ---
- [INFO] No tests to run.
- [INFO]
- [INFO] --- maven-jar-plugin:2.4:jar (default-jar) @ b2b-account-service ---
- [INFO] Building jar: D:\code\IdeaProjects\b2b\b2b-account\b2b-account-service\target\b2b-account-service-1.0-SNAPSHOT.jar
- [INFO]
- [INFO] --- maven-install-plugin:2.4:install (default-install) @ b2b-account-service ---
- [INFO] Installing D:\code\IdeaProjects\b2b\b2b-account\b2b-account-service\target\b2b-account-service-1.0-SNAPSHOT.jar to C:\Users\Think\.m2\repository\com\javacode2018\b2b-account-service\1.0-SNAPSHOT\b2b-account-service-1.0-SNAPSHOT.jar
- [INFO] Installing D:\code\IdeaProjects\b2b\b2b-account\b2b-account-service\pom.xml to C:\Users\Think\.m2\repository\com\javacode2018\b2b-account-service\1.0-SNAPSHOT\b2b-account-service-1.0-SNAPSHOT.pom
- [INFO]
- [INFO] --------------------< com.javacode2018:b2b-account >--------------------
- [INFO] Building b2b-account 1.0-SNAPSHOT [3/7]
- [INFO] --------------------------------[ pom ]---------------------------------
- [INFO]
- [INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ b2b-account ---
- [INFO]
- [INFO] --- maven-install-plugin:2.4:install (default-install) @ b2b-account ---
- [INFO] Installing D:\code\IdeaProjects\b2b\b2b-account\pom.xml to C:\Users\Think\.m2\repository\com\javacode2018\b2b-account\1.0-SNAPSHOT\b2b-account-1.0-SNAPSHOT.pom
- [INFO]
- [INFO] -------------------< com.javacode2018:b2b-order-api >-------------------
- [INFO] Building b2b-order-api 1.0-SNAPSHOT [4/7]
- [INFO] --------------------------------[ jar ]---------------------------------
- [INFO]
- [INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ b2b-order-api ---
- [INFO] Deleting D:\code\IdeaProjects\b2b\b2b-order\b2b-order-api\target
- [INFO]
- [INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ b2b-order-api ---
- [WARNING] Using platform encoding (GBK actually) to copy filtered resources, i.e. build is platform dependent!
- [INFO] Copying 0 resource
- [INFO]
- [INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ b2b-order-api ---
- [INFO] Nothing to compile - all classes are up to date
- [INFO]
- [INFO] --- maven-resources-plugin:2.6:testResources (default-testResources) @ b2b-order-api ---
- [WARNING] Using platform encoding (GBK actually) to copy filtered resources, i.e. build is platform dependent!
- [INFO] skip non existing resourceDirectory D:\code\IdeaProjects\b2b\b2b-order\b2b-order-api\src\test\resources
- [INFO]
- [INFO] --- maven-compiler-plugin:3.1:testCompile (default-testCompile) @ b2b-order-api ---
- [INFO] Nothing to compile - all classes are up to date
- [INFO]
- [INFO] --- maven-surefire-plugin:2.12.4:test (default-test) @ b2b-order-api ---
- [INFO] No tests to run.
- [INFO]
- [INFO] --- maven-jar-plugin:2.4:jar (default-jar) @ b2b-order-api ---
- [INFO] Building jar: D:\code\IdeaProjects\b2b\b2b-order\b2b-order-api\target\b2b-order-api-1.0-SNAPSHOT.jar
- [INFO]
- [INFO] --- maven-install-plugin:2.4:install (default-install) @ b2b-order-api ---
- [INFO] Installing D:\code\IdeaProjects\b2b\b2b-order\b2b-order-api\target\b2b-order-api-1.0-SNAPSHOT.jar to C:\Users\Think\.m2\repository\com\javacode2018\b2b-order-api\1.0-SNAPSHOT\b2b-order-api-1.0-SNAPSHOT.jar
- [INFO] Installing D:\code\IdeaProjects\b2b\b2b-order\b2b-order-api\pom.xml to C:\Users\Think\.m2\repository\com\javacode2018\b2b-order-api\1.0-SNAPSHOT\b2b-order-api-1.0-SNAPSHOT.pom
- [INFO]
- [INFO] -----------------< com.javacode2018:b2b-order-service >-----------------
- [INFO] Building b2b-order-service 1.0-SNAPSHOT [5/7]
- [INFO] --------------------------------[ jar ]---------------------------------
- [INFO]
- [INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ b2b-order-service ---
- [INFO] Deleting D:\code\IdeaProjects\b2b\b2b-order\b2b-order-service\target
- [INFO]
- [INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ b2b-order-service ---
- [WARNING] Using platform encoding (GBK actually) to copy filtered resources, i.e. build is platform dependent!
- [INFO] Copying 0 resource
- [INFO]
- [INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ b2b-order-service ---
- [INFO] Nothing to compile - all classes are up to date
- [INFO]
- [INFO] --- maven-resources-plugin:2.6:testResources (default-testResources) @ b2b-order-service ---
- [WARNING] Using platform encoding (GBK actually) to copy filtered resources, i.e. build is platform dependent!
- [INFO] skip non existing resourceDirectory D:\code\IdeaProjects\b2b\b2b-order\b2b-order-service\src\test\resources
- [INFO]
- [INFO] --- maven-compiler-plugin:3.1:testCompile (default-testCompile) @ b2b-order-service ---
- [INFO] Nothing to compile - all classes are up to date
- [INFO]
- [INFO] --- maven-surefire-plugin:2.12.4:test (default-test) @ b2b-order-service ---
- [INFO] No tests to run.
- [INFO]
- [INFO] --- maven-jar-plugin:2.4:jar (default-jar) @ b2b-order-service ---
- [INFO] Building jar: D:\code\IdeaProjects\b2b\b2b-order\b2b-order-service\target\b2b-order-service-1.0-SNAPSHOT.jar
- [INFO]
- [INFO] --- maven-install-plugin:2.4:install (default-install) @ b2b-order-service ---
- [INFO] Installing D:\code\IdeaProjects\b2b\b2b-order\b2b-order-service\target\b2b-order-service-1.0-SNAPSHOT.jar to C:\Users\Think\.m2\repository\com\javacode2018\b2b-order-service\1.0-SNAPSHOT\b2b-order-service-1.0-SNAPSHOT.jar
- [INFO] Installing D:\code\IdeaProjects\b2b\b2b-order\b2b-order-service\pom.xml to C:\Users\Think\.m2\repository\com\javacode2018\b2b-order-service\1.0-SNAPSHOT\b2b-order-service-1.0-SNAPSHOT.pom
- [INFO]
- [INFO] ---------------------< com.javacode2018:b2b-order >---------------------
- [INFO] Building b2b-order 1.0-SNAPSHOT [6/7]
- [INFO] --------------------------------[ pom ]---------------------------------
- [INFO]
- [INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ b2b-order ---
- [INFO]
- [INFO] --- maven-install-plugin:2.4:install (default-install) @ b2b-order ---
- [INFO] Installing D:\code\IdeaProjects\b2b\b2b-order\pom.xml to C:\Users\Think\.m2\repository\com\javacode2018\b2b-order\1.0-SNAPSHOT\b2b-order-1.0-SNAPSHOT.pom
- [INFO]
- [INFO] ------------------------< com.javacode2018:b2b >------------------------
- [INFO] Building b2b 1.0-SNAPSHOT [7/7]
- [INFO] --------------------------------[ pom ]---------------------------------
- [INFO]
- [INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ b2b ---
- [INFO]
- [INFO] --- maven-install-plugin:2.4:install (default-install) @ b2b ---
- [INFO] Installing D:\code\IdeaProjects\b2b\pom.xml to C:\Users\Think\.m2\repository\com\javacode2018\b2b\1.0-SNAPSHOT\b2b-1.0-SNAPSHOT.pom
- [INFO] ------------------------------------------------------------------------
- [INFO] Reactor Summary for b2b 1.0-SNAPSHOT:
- [INFO]
- [INFO] b2b-account-api .................................... SUCCESS [ 1.806 s]
- [INFO] b2b-account-service ................................ SUCCESS [ 0.298 s]
- [INFO] b2b-account ........................................ SUCCESS [ 0.082 s]
- [INFO] b2b-order-api ...................................... SUCCESS [ 0.229 s]
- [INFO] b2b-order-service .................................. SUCCESS [ 0.254 s]
- [INFO] b2b-order .......................................... SUCCESS [ 0.058 s]
- [INFO] b2b ................................................ SUCCESS [ 0.069 s]
- [INFO] ------------------------------------------------------------------------
- [INFO] BUILD SUCCESS
- [INFO] ------------------------------------------------------------------------
- [INFO] Total time: 3.072 s
- [INFO] Finished at: 2019-11-20T16:03:27+08:00
- [INFO] ------------------------------------------------------------------------
注意上面有这样的输出:
- [INFO] Reactor Build Order:
- [INFO]
- [INFO] b2b-account-api [jar]
- [INFO] b2b-account-service [jar]
- [INFO] b2b-account [pom]
- [INFO] b2b-order-api [jar]
- [INFO] b2b-order-service [jar]
- [INFO] b2b-order [pom]
- [INFO] b2b [pom]
maven会根据模块之间的依赖关系,然后会得到所有模块的构建顺序,上面共有7个pom.xml文件,也就是7个maven构件,按照上面列出的顺序依次进行构建。
可以看到b2b-account-api
是被其他一些模块依赖的,所以这个放在了第一个。
mvn
命令对多模块构件时,会根据模块的依赖关系而得到模块的构建顺序,这个功能就是maven的反应堆(reactor)做的事情,反应堆会根据模块之间的依赖关系、聚合关系、继承关系等等,从而计算得出一个合理的模块构建顺序,所以反应堆的功能是相当强大的。
有这样的一种场景:b2b-account-api
被b2b-account-service
和b2b-order-service
依赖了,所以当b2b-account-api
有修改的时候,我们希望他们3个都能够被重新构建一次,而不是去对所有的模块都进行重新构建,我们只希望被影响的模块都能够参与重新构建,大家有什么好的办法?
上面列出的只是2个模块的功能,真正的电商项目还有很多模块,如果每次修改一个模块,我们都去重新打包所有的模块,这个构建过程耗时是非常久的,只能干等着,我们需要的是按需构建,需要构建哪些模块让我们自己能够随意指定,这样也可以加快构建的速度,所以我们需要这样的功能
maven反应堆帮我们考虑到了这种情况,mvn命令提供了一些功能可以帮我们实现这些操作,我们看一下mvn的帮助文档,mvn -h
可以查看帮助,如下:
- D:\code\IdeaProjects\b2b>mvn -h
-
- usage: mvn [options] [<goal(s)>] [<phase(s)>]
-
- Options:
- -am,--also-make If project list is specified, also
- build projects required by the
- list
- -amd,--also-make-dependents If project list is specified, also
- build projects that depend on
- projects on the list
- -B,--batch-mode Run in non-interactive (batch)
- mode (disables output color)
- -b,--builder <arg> The id of the build strategy to
- use
- -C,--strict-checksums Fail the build if checksums don't
- match
- -c,--lax-checksums Warn if checksums don't match
- -cpu,--check-plugin-updates Ineffective, only kept for
- backward compatibility
- -D,--define <arg> Define a system property
- -e,--errors Produce execution error messages
- -emp,--encrypt-master-password <arg> Encrypt master security password
- -ep,--encrypt-password <arg> Encrypt server password
- -f,--file <arg> Force the use of an alternate POM
- file (or directory with pom.xml)
- -fae,--fail-at-end Only fail the build afterwards;
- allow all non-impacted builds to
- continue
- -ff,--fail-fast Stop at first failure in
- reactorized builds
- -fn,--fail-never NEVER fail the build, regardless
- of project result
- -gs,--global-settings <arg> Alternate path for the global
- settings file
- -gt,--global-toolchains <arg> Alternate path for the global
- toolchains file
- -h,--help Display help information
- -l,--log-file <arg> Log file where all build output
- will go (disables output color)
- -llr,--legacy-local-repository Use Maven 2 Legacy Local
- Repository behaviour, ie no use of
- _remote.repositories. Can also be
- activated by using
- -Dmaven.legacyLocalRepo=true
- -N,--non-recursive Do not recurse into sub-projects
- -npr,--no-plugin-registry Ineffective, only kept for
- backward compatibility
- -npu,--no-plugin-updates Ineffective, only kept for
- backward compatibility
- -nsu,--no-snapshot-updates Suppress SNAPSHOT updates
- -ntp,--no-transfer-progress Do not display transfer progress
- when downloading or uploading
- -o,--offline Work offline
- -P,--activate-profiles <arg> Comma-delimited list of profiles
- to activate
- -pl,--projects <arg> Comma-delimited list of specified
- reactor projects to build instead
- of all projects. A project can be
- specified by [groupId]:artifactId
- or by its relative path
- -q,--quiet Quiet output - only show errors
- -rf,--resume-from <arg> Resume reactor from specified
- project
- -s,--settings <arg> Alternate path for the user
- settings file
- -t,--toolchains <arg> Alternate path for the user
- toolchains file
- -T,--threads <arg> Thread count, for instance 2.0C
- where C is core multiplied
- -U,--update-snapshots Forces a check for missing
- releases and updated snapshots on
- remote repositories
- -up,--update-plugins Ineffective, only kept for
- backward compatibility
- -v,--version Display version information
- -V,--show-version Display version information
- WITHOUT stopping build
- -X,--debug Produce execution debug output
上面列出了mvn
命令后面的一些选项,有几个选项本次我们需要用到,如下:
构件指定的模块,arg表示多个模块,之间用逗号分开,模块有两种写法
- -pl 模块1相对路径 [,模块2相对路径] [,模块n相对路径]
- -pl [模块1的groupId]:模块1的artifactId [,[模块2的groupId]:模块2的artifactId] [,[模块n的groupId]:模块n的artifactId]
举例:
下面命令都是在b2b/pom.xml来运行
- mvn clean install -pl b2b-account
- mvn clean install -pl b2b-account/b2b-account-api
- mvn clean install -pl b2b-account/b2b-account-api,b2b-account/b2b-account-service
- mvn clean install -pl :b2b-account-api,b2b-order/b2b-order-api
- mvn clean install -pl :b2b-account-api,:b2b-order-service
从指定的模块恢复反应堆
同时构建所列模块的依赖模块
同时构件依赖于所列模块的模块
下面我们通过6个案例细说上面这些用法。
注意:下面所有案例都在b2b/pom.xml
所在目录执行。
只构建p-account
模块,运行命令
mvn clean install -pl b2b-account
效果如下:
- D:\code\IdeaProjects\b2b>mvn clean install -pl b2b-account
- [INFO] Scanning for projects...
- [INFO]
- [INFO] --------------------< com.javacode2018:b2b-account >--------------------
- [INFO] Building b2b-account 1.0-SNAPSHOT
- [INFO] --------------------------------[ pom ]---------------------------------
- [INFO]
- [INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ b2b-account ---
- [INFO]
- [INFO] --- maven-install-plugin:2.4:install (default-install) @ b2b-account ---
- [INFO] Installing D:\code\IdeaProjects\b2b\b2b-account\pom.xml to C:\Users\Think\.m2\repository\com\javacode2018\b2b-account\1.0-SNAPSHOT\b2b-account-1.0-SNAPSHOT.pom
- [INFO] ------------------------------------------------------------------------
- [INFO] BUILD SUCCESS
- [INFO] ------------------------------------------------------------------------
- [INFO] Total time: 0.907 s
- [INFO] Finished at: 2019-11-20T16:12:51+08:00
- [INFO] ------------------------------------------------------------------------
可以看到只构建了b2b-account
。
只构建b2b-account-api模块,运行命令:
mvn clean install -pl b2b-account/b2b-account-api
效果如下:
- D:\code\IdeaProjects\b2b>mvn clean install -pl b2b-account/b2b-account-api
- [INFO] Scanning for projects...
- [INFO]
- [INFO] ------------------< com.javacode2018:b2b-account-api >------------------
- [INFO] Building b2b-account-api 1.0-SNAPSHOT
- [INFO] --------------------------------[ jar ]---------------------------------
- [INFO]
- [INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ b2b-account-api ---
- [INFO] Deleting D:\code\IdeaProjects\b2b\b2b-account\b2b-account-api\target
- [INFO]
- [INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ b2b-account-api ---
- [WARNING] Using platform encoding (GBK actually) to copy filtered resources, i.e. build is platform dependent!
- [INFO] Copying 0 resource
- [INFO]
- [INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ b2b-account-api ---
- [INFO] Nothing to compile - all classes are up to date
- [INFO]
- [INFO] --- maven-resources-plugin:2.6:testResources (default-testResources) @ b2b-account-api ---
- [WARNING] Using platform encoding (GBK actually) to copy filtered resources, i.e. build is platform dependent!
- [INFO] skip non existing resourceDirectory D:\code\IdeaProjects\b2b\b2b-account\b2b-account-api\src\test\resources
- [INFO]
- [INFO] --- maven-compiler-plugin:3.1:testCompile (default-testCompile) @ b2b-account-api ---
- [INFO] Nothing to compile - all classes are up to date
- [INFO]
- [INFO] --- maven-surefire-plugin:2.12.4:test (default-test) @ b2b-account-api ---
- [INFO] No tests to run.
- [INFO]
- [INFO] --- maven-jar-plugin:2.4:jar (default-jar) @ b2b-account-api ---
- [INFO] Building jar: D:\code\IdeaProjects\b2b\b2b-account\b2b-account-api\target\b2b-account-api-1.0-SNAPSHOT.jar
- [INFO]
- [INFO] --- maven-install-plugin:2.4:install (default-install) @ b2b-account-api ---
- [INFO] Installing D:\code\IdeaProjects\b2b\b2b-account\b2b-account-api\target\b2b-account-api-1.0-SNAPSHOT.jar to C:\Users\Think\.m2\repository\com\javacode2018\b2b-account-api\1.0-SNAPSHOT\b2b-account-api-1.0-SNAPSHOT.jar
- [INFO] Installing D:\code\IdeaProjects\b2b\b2b-account\b2b-account-api\pom.xml to C:\Users\Think\.m2\repository\com\javacode2018\b2b-account-api\1.0-SNAPSHOT\b2b-account-api-1.0-SNAPSHOT.pom
- [INFO] ------------------------------------------------------------------------
- [INFO] BUILD SUCCESS
- [INFO] ------------------------------------------------------------------------
- [INFO] Total time: 2.853 s
- [INFO] Finished at: 2019-11-20T16:14:37+08:00
- [INFO] ------------------------------------------------------------------------
上面使用的是相对路径的写法,还有2种写法,大家可以去试试,如下:
- mvn clean install -pl :b2b-account-api
- mvn clean install -pl com.javacode2018:b2b-account-api
构建b2b-account-api和b2b-order-api,运行下面命令:
mvn clean install -pl b2b-account/b2b-account-api,b2b-order/b2b-order-api
效果如下:
- D:\code\IdeaProjects\b2b>mvn clean install -pl b2b-account/b2b-account-api,b2b-order/b2b-order-api
- [INFO] Scanning for projects...
- [INFO] ------------------------------------------------------------------------
- [INFO] Reactor Build Order:
- [INFO]
- [INFO] b2b-account-api [jar]
- [INFO] b2b-order-api [jar]
- [INFO]
- [INFO] ------------------< com.javacode2018:b2b-account-api >------------------
- [INFO] Building b2b-account-api 1.0-SNAPSHOT [1/2]
- [INFO] --------------------------------[ jar ]---------------------------------
- [INFO]
- [INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ b2b-account-api ---
- [INFO] Deleting D:\code\IdeaProjects\b2b\b2b-account\b2b-account-api\target
- [INFO]
- [INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ b2b-account-api ---
- [WARNING] Using platform encoding (GBK actually) to copy filtered resources, i.e. build is platform dependent!
- [INFO] Copying 0 resource
- [INFO]
- [INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ b2b-account-api ---
- [INFO] Nothing to compile - all classes are up to date
- [INFO]
- [INFO] --- maven-resources-plugin:2.6:testResources (default-testResources) @ b2b-account-api ---
- [WARNING] Using platform encoding (GBK actually) to copy filtered resources, i.e. build is platform dependent!
- [INFO] skip non existing resourceDirectory D:\code\IdeaProjects\b2b\b2b-account\b2b-account-api\src\test\resources
- [INFO]
- [INFO] --- maven-compiler-plugin:3.1:testCompile (default-testCompile) @ b2b-account-api ---
- [INFO] Nothing to compile - all classes are up to date
- [INFO]
- [INFO] --- maven-surefire-plugin:2.12.4:test (default-test) @ b2b-account-api ---
- [INFO] No tests to run.
- [INFO]
- [INFO] --- maven-jar-plugin:2.4:jar (default-jar) @ b2b-account-api ---
- [INFO] Building jar: D:\code\IdeaProjects\b2b\b2b-account\b2b-account-api\target\b2b-account-api-1.0-SNAPSHOT.jar
- [INFO]
- [INFO] --- maven-install-plugin:2.4:install (default-install) @ b2b-account-api ---
- [INFO] Installing D:\code\IdeaProjects\b2b\b2b-account\b2b-account-api\target\b2b-account-api-1.0-SNAPSHOT.jar to C:\Users\Think\.m2\repository\com\javacode2018\b2b-account-api\1.0-SNAPSHOT\b2b-account-api-1.0-SNAPSHOT.jar
- [INFO] Installing D:\code\IdeaProjects\b2b\b2b-account\b2b-account-api\pom.xml to C:\Users\Think\.m2\repository\com\javacode2018\b2b-account-api\1.0-SNAPSHOT\b2b-account-api-1.0-SNAPSHOT.pom
- [INFO]
- [INFO] -------------------< com.javacode2018:b2b-order-api >-------------------
- [INFO] Building b2b-order-api 1.0-SNAPSHOT [2/2]
- [INFO] --------------------------------[ jar ]---------------------------------
- [INFO]
- [INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ b2b-order-api ---
- [INFO] Deleting D:\code\IdeaProjects\b2b\b2b-order\b2b-order-api\target
- [INFO]
- [INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ b2b-order-api ---
- [WARNING] Using platform encoding (GBK actually) to copy filtered resources, i.e. build is platform dependent!
- [INFO] Copying 0 resource
- [INFO]
- [INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ b2b-order-api ---
- [INFO] Nothing to compile - all classes are up to date
- [INFO]
- [INFO] --- maven-resources-plugin:2.6:testResources (default-testResources) @ b2b-order-api ---
- [WARNING] Using platform encoding (GBK actually) to copy filtered resources, i.e. build is platform dependent!
- [INFO] skip non existing resourceDirectory D:\code\IdeaProjects\b2b\b2b-order\b2b-order-api\src\test\resources
- [INFO]
- [INFO] --- maven-compiler-plugin:3.1:testCompile (default-testCompile) @ b2b-order-api ---
- [INFO] Nothing to compile - all classes are up to date
- [INFO]
- [INFO] --- maven-surefire-plugin:2.12.4:test (default-test) @ b2b-order-api ---
- [INFO] No tests to run.
- [INFO]
- [INFO] --- maven-jar-plugin:2.4:jar (default-jar) @ b2b-order-api ---
- [INFO] Building jar: D:\code\IdeaProjects\b2b\b2b-order\b2b-order-api\target\b2b-order-api-1.0-SNAPSHOT.jar
- [INFO]
- [INFO] --- maven-install-plugin:2.4:install (default-install) @ b2b-order-api ---
- [INFO] Installing D:\code\IdeaProjects\b2b\b2b-order\b2b-order-api\target\b2b-order-api-1.0-SNAPSHOT.jar to C:\Users\Think\.m2\repository\com\javacode2018\b2b-order-api\1.0-SNAPSHOT\b2b-order-api-1.0-SNAPSHOT.jar
- [INFO] Installing D:\code\IdeaProjects\b2b\b2b-order\b2b-order-api\pom.xml to C:\Users\Think\.m2\repository\com\javacode2018\b2b-order-api\1.0-SNAPSHOT\b2b-order-api-1.0-SNAPSHOT.pom
- [INFO] ------------------------------------------------------------------------
- [INFO] Reactor Summary for b2b-account-api 1.0-SNAPSHOT:
- [INFO]
- [INFO] b2b-account-api .................................... SUCCESS [ 2.874 s]
- [INFO] b2b-order-api ...................................... SUCCESS [ 0.393 s]
- [INFO] ------------------------------------------------------------------------
- [INFO] BUILD SUCCESS
- [INFO] ------------------------------------------------------------------------
- [INFO] Total time: 3.554 s
- [INFO] Finished at: 2019-11-20T16:15:57+08:00
- [INFO] ------------------------------------------------------------------------
上面输出中可以看到只构建了2个目标模块。
我们只修改了b2b-account-api代码,所以我希望对这个重新打包,并且对这个有依赖的也重新打包,所以需要打包下面3个模块:
- b2b-account-api
- b2b-account-service
- b2b-order-service
上面列表中的后面两个是依赖于b2b-account-api
的,可以在b2b/pom.xml中执行下面命令:
mvn clean install -pl b2b-account/b2b-account-api -amd
我们看一下效果:
- D:\code\IdeaProjects\b2b>mvn clean install -pl b2b-account/b2b-account-api -amd
- [INFO] Scanning for projects...
- [INFO] ------------------------------------------------------------------------
- [INFO] Reactor Build Order:
- [INFO]
- [INFO] b2b-account-api [jar]
- [INFO] b2b-account-service [jar]
- [INFO] b2b-order-service [jar]
- [INFO]
- [INFO] ------------------< com.javacode2018:b2b-account-api >------------------
- [INFO] Building b2b-account-api 1.0-SNAPSHOT [1/3]
- [INFO] --------------------------------[ jar ]---------------------------------
- [INFO]
- [INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ b2b-account-api ---
- [INFO] Deleting D:\code\IdeaProjects\b2b\b2b-account\b2b-account-api\target
- [INFO]
- [INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ b2b-account-api ---
- [WARNING] Using platform encoding (GBK actually) to copy filtered resources, i.e. build is platform dependent!
- [INFO] Copying 0 resource
- [INFO]
- [INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ b2b-account-api ---
- [INFO] Nothing to compile - all classes are up to date
- [INFO]
- [INFO] --- maven-resources-plugin:2.6:testResources (default-testResources) @ b2b-account-api ---
- [WARNING] Using platform encoding (GBK actually) to copy filtered resources, i.e. build is platform dependent!
- [INFO] skip non existing resourceDirectory D:\code\IdeaProjects\b2b\b2b-account\b2b-account-api\src\test\resources
- [INFO]
- [INFO] --- maven-compiler-plugin:3.1:testCompile (default-testCompile) @ b2b-account-api ---
- [INFO] Nothing to compile - all classes are up to date
- [INFO]
- [INFO] --- maven-surefire-plugin:2.12.4:test (default-test) @ b2b-account-api ---
- [INFO] No tests to run.
- [INFO]
- [INFO] --- maven-jar-plugin:2.4:jar (default-jar) @ b2b-account-api ---
- [INFO] Building jar: D:\code\IdeaProjects\b2b\b2b-account\b2b-account-api\target\b2b-account-api-1.0-SNAPSHOT.jar
- [INFO]
- [INFO] --- maven-install-plugin:2.4:install (default-install) @ b2b-account-api ---
- [INFO] Installing D:\code\IdeaProjects\b2b\b2b-account\b2b-account-api\target\b2b-account-api-1.0-SNAPSHOT.jar to C:\Users\Think\.m2\repository\com\javacode2018\b2b-account-api\1.0-SNAPSHOT\b2b-account-api-1.0-SNAPSHOT.jar
- [INFO] Installing D:\code\IdeaProjects\b2b\b2b-account\b2b-account-api\pom.xml to C:\Users\Think\.m2\repository\com\javacode2018\b2b-account-api\1.0-SNAPSHOT\b2b-account-api-1.0-SNAPSHOT.pom
- [INFO]
- [INFO] ----------------< com.javacode2018:b2b-account-service >----------------
- [INFO] Building b2b-account-service 1.0-SNAPSHOT [2/3]
- [INFO] --------------------------------[ jar ]---------------------------------
- [INFO]
- [INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ b2b-account-service ---
- [INFO] Deleting D:\code\IdeaProjects\b2b\b2b-account\b2b-account-service\target
- [INFO]
- [INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ b2b-account-service ---
- [WARNING] Using platform encoding (GBK actually) to copy filtered resources, i.e. build is platform dependent!
- [INFO] Copying 0 resource
- [INFO]
- [INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ b2b-account-service ---
- [INFO] Nothing to compile - all classes are up to date
- [INFO]
- [INFO] --- maven-resources-plugin:2.6:testResources (default-testResources) @ b2b-account-service ---
- [WARNING] Using platform encoding (GBK actually) to copy filtered resources, i.e. build is platform dependent!
- [INFO] skip non existing resourceDirectory D:\code\IdeaProjects\b2b\b2b-account\b2b-account-service\src\test\resources
- [INFO]
- [INFO] --- maven-compiler-plugin:3.1:testCompile (default-testCompile) @ b2b-account-service ---
- [INFO] Nothing to compile - all classes are up to date
- [INFO]
- [INFO] --- maven-surefire-plugin:2.12.4:test (default-test) @ b2b-account-service ---
- [INFO] No tests to run.
- [INFO]
- [INFO] --- maven-jar-plugin:2.4:jar (default-jar) @ b2b-account-service ---
- [INFO] Building jar: D:\code\IdeaProjects\b2b\b2b-account\b2b-account-service\target\b2b-account-service-1.0-SNAPSHOT.jar
- [INFO]
- [INFO] --- maven-install-plugin:2.4:install (default-install) @ b2b-account-service ---
- [INFO] Installing D:\code\IdeaProjects\b2b\b2b-account\b2b-account-service\target\b2b-account-service-1.0-SNAPSHOT.jar to C:\Users\Think\.m2\repository\com\javacode2018\b2b-account-service\1.0-SNAPSHOT\b2b-account-service-1.0-SNAPSHOT.jar
- [INFO] Installing D:\code\IdeaProjects\b2b\b2b-account\b2b-account-service\pom.xml to C:\Users\Think\.m2\repository\com\javacode2018\b2b-account-service\1.0-SNAPSHOT\b2b-account-service-1.0-SNAPSHOT.pom
- [INFO]
- [INFO] -----------------< com.javacode2018:b2b-order-service >-----------------
- [INFO] Building b2b-order-service 1.0-SNAPSHOT [3/3]
- [INFO] --------------------------------[ jar ]---------------------------------
- [INFO]
- [INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ b2b-order-service ---
- [INFO] Deleting D:\code\IdeaProjects\b2b\b2b-order\b2b-order-service\target
- [INFO]
- [INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ b2b-order-service ---
- [WARNING] Using platform encoding (GBK actually) to copy filtered resources, i.e. build is platform dependent!
- [INFO] Copying 0 resource
- [INFO]
- [INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ b2b-order-service ---
- [INFO] Nothing to compile - all classes are up to date
- [INFO]
- [INFO] --- maven-resources-plugin:2.6:testResources (default-testResources) @ b2b-order-service ---
- [WARNING] Using platform encoding (GBK actually) to copy filtered resources, i.e. build is platform dependent!
- [INFO] skip non existing resourceDirectory D:\code\IdeaProjects\b2b\b2b-order\b2b-order-service\src\test\resources
- [INFO]
- [INFO] --- maven-compiler-plugin:3.1:testCompile (default-testCompile) @ b2b-order-service ---
- [INFO] Nothing to compile - all classes are up to date
- [INFO]
- [INFO] --- maven-surefire-plugin:2.12.4:test (default-test) @ b2b-order-service ---
- [INFO] No tests to run.
- [INFO]
- [INFO] --- maven-jar-plugin:2.4:jar (default-jar) @ b2b-order-service ---
- [INFO] Building jar: D:\code\IdeaProjects\b2b\b2b-order\b2b-order-service\target\b2b-order-service-1.0-SNAPSHOT.jar
- [INFO]
- [INFO] --- maven-install-plugin:2.4:install (default-install) @ b2b-order-service ---
- [INFO] Installing D:\code\IdeaProjects\b2b\b2b-order\b2b-order-service\target\b2b-order-service-1.0-SNAPSHOT.jar to C:\Users\Think\.m2\repository\com\javacode2018\b2b-order-service\1.0-SNAPSHOT\b2b-order-service-1.0-SNAPSHOT.jar
- [INFO] Installing D:\code\IdeaProjects\b2b\b2b-order\b2b-order-service\pom.xml to C:\Users\Think\.m2\repository\com\javacode2018\b2b-order-service\1.0-SNAPSHOT\b2b-order-service-1.0-SNAPSHOT.pom
- [INFO] ------------------------------------------------------------------------
- [INFO] Reactor Summary for b2b-account-api 1.0-SNAPSHOT:
- [INFO]
- [INFO] b2b-account-api .................................... SUCCESS [ 2.440 s]
- [INFO] b2b-account-service ................................ SUCCESS [ 0.381 s]
- [INFO] b2b-order-service .................................. SUCCESS [ 0.364 s]
- [INFO] ------------------------------------------------------------------------
- [INFO] BUILD SUCCESS
- [INFO] ------------------------------------------------------------------------
- [INFO] Total time: 3.508 s
- [INFO] Finished at: 2019-11-20T16:05:00+08:00
- [INFO] ------------------------------------------------------------------------
从上面输出中看一下反应堆列出的构建顺序:b2b-account-api、b2b-account-service、b2b-order-service。
上面过程给大家捋一捋:
上面命令先会运行-pl b2b-account-api
得到一个反应堆列表,如下,只有一个模块:
b2b-account-api
然后后面又会执行amd
,这个命令会找到对-pl b2b-account-api
有依赖的构件,也就是:
- b2b-account-service
- b2b-order-serivce
然后反应堆会对3个构件进行排序,得到一个正确的构件顺序,如下:
- [INFO] Reactor Build Order:
- [INFO]
- [INFO] b2b-account-api [jar]
- [INFO] b2b-account-service [jar]
- [INFO] b2b-order-service [jar]
然后maven会依次对他们执行:
mvn clean install
需求:我们来构建b2b-order-service,希望b2b-account-service依赖的构件也能被同时构建,b2b-account-service依赖于b2b-account-api
和b2b-order-api
,可能b2b-account-service会依赖的更多。
可以使用下面命令:
mvn clean install -pl b2b-order/b2b-order-service -am
效果如下:
- D:\code\IdeaProjects\b2b>mvn clean install -pl b2b-order/b2b-order-service -am
- [INFO] Scanning for projects...
- [INFO] ------------------------------------------------------------------------
- [INFO] Reactor Build Order:
- [INFO]
- [INFO] b2b-account-api [jar]
- [INFO] b2b-order-api [jar]
- [INFO] b2b-order-service [jar]
- [INFO]
- [INFO] ------------------< com.javacode2018:b2b-account-api >------------------
- [INFO] Building b2b-account-api 1.0-SNAPSHOT [1/3]
- [INFO] --------------------------------[ jar ]---------------------------------
- [INFO]
- [INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ b2b-account-api ---
- [INFO] Deleting D:\code\IdeaProjects\b2b\b2b-account\b2b-account-api\target
- [INFO]
- [INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ b2b-account-api ---
- [WARNING] Using platform encoding (GBK actually) to copy filtered resources, i.e. build is platform dependent!
- [INFO] Copying 0 resource
- [INFO]
- [INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ b2b-account-api ---
- [INFO] Nothing to compile - all classes are up to date
- [INFO]
- [INFO] --- maven-resources-plugin:2.6:testResources (default-testResources) @ b2b-account-api ---
- [WARNING] Using platform encoding (GBK actually) to copy filtered resources, i.e. build is platform dependent!
- [INFO] skip non existing resourceDirectory D:\code\IdeaProjects\b2b\b2b-account\b2b-account-api\src\test\resources
- [INFO]
- [INFO] --- maven-compiler-plugin:3.1:testCompile (default-testCompile) @ b2b-account-api ---
- [INFO] Nothing to compile - all classes are up to date
- [INFO]
- [INFO] --- maven-surefire-plugin:2.12.4:test (default-test) @ b2b-account-api ---
- [INFO] No tests to run.
- [INFO]
- [INFO] --- maven-jar-plugin:2.4:jar (default-jar) @ b2b-account-api ---
- [INFO] Building jar: D:\code\IdeaProjects\b2b\b2b-account\b2b-account-api\target\b2b-account-api-1.0-SNAPSHOT.jar
- [INFO]
- [INFO] --- maven-install-plugin:2.4:install (default-install) @ b2b-account-api ---
- [INFO] Installing D:\code\IdeaProjects\b2b\b2b-account\b2b-account-api\target\b2b-account-api-1.0-SNAPSHOT.jar to C:\Users\Think\.m2\repository\com\javacode2018\b2b-account-api\1.0-SNAPSHOT\b2b-account-api-1.0-SNAPSHOT.jar
- [INFO] Installing D:\code\IdeaProjects\b2b\b2b-account\b2b-account-api\pom.xml to C:\Users\Think\.m2\repository\com\javacode2018\b2b-account-api\1.0-SNAPSHOT\b2b-account-api-1.0-SNAPSHOT.pom
- [INFO]
- [INFO] -------------------< com.javacode2018:b2b-order-api >-------------------
- [INFO] Building b2b-order-api 1.0-SNAPSHOT [2/3]
- [INFO] --------------------------------[ jar ]---------------------------------
- [INFO]
- [INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ b2b-order-api ---
- [INFO] Deleting D:\code\IdeaProjects\b2b\b2b-order\b2b-order-api\target
- [INFO]
- [INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ b2b-order-api ---
- [WARNING] Using platform encoding (GBK actually) to copy filtered resources, i.e. build is platform dependent!
- [INFO] Copying 0 resource
- [INFO]
- [INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ b2b-order-api ---
- [INFO] Nothing to compile - all classes are up to date
- [INFO]
- [INFO] --- maven-resources-plugin:2.6:testResources (default-testResources) @ b2b-order-api ---
- [WARNING] Using platform encoding (GBK actually) to copy filtered resources, i.e. build is platform dependent!
- [INFO] skip non existing resourceDirectory D:\code\IdeaProjects\b2b\b2b-order\b2b-order-api\src\test\resources
- [INFO]
- [INFO] --- maven-compiler-plugin:3.1:testCompile (default-testCompile) @ b2b-order-api ---
- [INFO] Nothing to compile - all classes are up to date
- [INFO]
- [INFO] --- maven-surefire-plugin:2.12.4:test (default-test) @ b2b-order-api ---
- [INFO] No tests to run.
- [INFO]
- [INFO] --- maven-jar-plugin:2.4:jar (default-jar) @ b2b-order-api ---
- [INFO] Building jar: D:\code\IdeaProjects\b2b\b2b-order\b2b-order-api\target\b2b-order-api-1.0-SNAPSHOT.jar
- [INFO]
- [INFO] --- maven-install-plugin:2.4:install (default-install) @ b2b-order-api ---
- [INFO] Installing D:\code\IdeaProjects\b2b\b2b-order\b2b-order-api\target\b2b-order-api-1.0-SNAPSHOT.jar to C:\Users\Think\.m2\repository\com\javacode2018\b2b-order-api\1.0-SNAPSHOT\b2b-order-api-1.0-SNAPSHOT.jar
- [INFO] Installing D:\code\IdeaProjects\b2b\b2b-order\b2b-order-api\pom.xml to C:\Users\Think\.m2\repository\com\javacode2018\b2b-order-api\1.0-SNAPSHOT\b2b-order-api-1.0-SNAPSHOT.pom
- [INFO]
- [INFO] -----------------< com.javacode2018:b2b-order-service >-----------------
- [INFO] Building b2b-order-service 1.0-SNAPSHOT [3/3]
- [INFO] --------------------------------[ jar ]---------------------------------
- [INFO]
- [INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ b2b-order-service ---
- [INFO] Deleting D:\code\IdeaProjects\b2b\b2b-order\b2b-order-service\target
- [INFO]
- [INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ b2b-order-service ---
- [WARNING] Using platform encoding (GBK actually) to copy filtered resources, i.e. build is platform dependent!
- [INFO] Copying 0 resource
- [INFO]
- [INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ b2b-order-service ---
- [INFO] Nothing to compile - all classes are up to date
- [INFO]
- [INFO] --- maven-resources-plugin:2.6:testResources (default-testResources) @ b2b-order-service ---
- [WARNING] Using platform encoding (GBK actually) to copy filtered resources, i.e. build is platform dependent!
- [INFO] skip non existing resourceDirectory D:\code\IdeaProjects\b2b\b2b-order\b2b-order-service\src\test\resources
- [INFO]
- [INFO] --- maven-compiler-plugin:3.1:testCompile (default-testCompile) @ b2b-order-service ---
- [INFO] Nothing to compile - all classes are up to date
- [INFO]
- [INFO] --- maven-surefire-plugin:2.12.4:test (default-test) @ b2b-order-service ---
- [INFO] No tests to run.
- [INFO]
- [INFO] --- maven-jar-plugin:2.4:jar (default-jar) @ b2b-order-service ---
- [INFO] Building jar: D:\code\IdeaProjects\b2b\b2b-order\b2b-order-service\target\b2b-order-service-1.0-SNAPSHOT.jar
- [INFO]
- [INFO] --- maven-install-plugin:2.4:install (default-install) @ b2b-order-service ---
- [INFO] Installing D:\code\IdeaProjects\b2b\b2b-order\b2b-order-service\target\b2b-order-service-1.0-SNAPSHOT.jar to C:\Users\Think\.m2\repository\com\javacode2018\b2b-order-service\1.0-SNAPSHOT\b2b-order-service-1.0-SNAPSHOT.jar
- [INFO] Installing D:\code\IdeaProjects\b2b\b2b-order\b2b-order-service\pom.xml to C:\Users\Think\.m2\repository\com\javacode2018\b2b-order-service\1.0-SNAPSHOT\b2b-order-service-1.0-SNAPSHOT.pom
- [INFO] ------------------------------------------------------------------------
- [INFO] Reactor Summary for b2b-account-api 1.0-SNAPSHOT:
- [INFO]
- [INFO] b2b-account-api .................................... SUCCESS [ 2.509 s]
- [INFO] b2b-order-api ...................................... SUCCESS [ 0.343 s]
- [INFO] b2b-order-service .................................. SUCCESS [ 0.340 s]
- [INFO] ------------------------------------------------------------------------
- [INFO] BUILD SUCCESS
- [INFO] ------------------------------------------------------------------------
- [INFO] Total time: 3.455 s
- [INFO] Finished at: 2019-11-20T16:46:45+08:00
- [INFO] ------------------------------------------------------------------------
从上面输出中看一下反应堆列出的构建顺序:b2b-account-api、b2b-order-api、b2b-order-service。
上面过程给大家捋一捋:
上面命令先会运行-pl b2b-order-service
得到一个反应堆列表:
b2b-order-service
然后后面又会执行am
,这个命令会找到-pl b2b-order-service
依赖的构件,也就是:
- b2b-account-api
- b2b-order-api
然后反应堆会对3个构件进行排序,得到一个正确的构件顺序,如下:
- [INFO] Reactor Build Order:
- [INFO]
- [INFO] b2b-account-api [jar]
- [INFO] b2b-order-api [jar]
- [INFO] b2b-order-service [jar]
然后maven会依次对他们执行:
mvn clean install
分别执行下面2条mvn命令,先看一下效果:
- mvn clean install
- mvn clean install -rf b2b-order/b2b-order-service
输出中我们取出部分内容,如下。
第一条命令,反应堆产生的构建顺序是:
- [INFO] Reactor Build Order:
- [INFO]
- [INFO] b2b-account-api [jar]
- [INFO] b2b-account-service [jar]
- [INFO] b2b-account [pom]
- [INFO] b2b-order-api [jar]
- [INFO] b2b-order-service [jar]
- [INFO] b2b-order [pom]
- [INFO] b2b [pom]
第2条命令,反应堆产生的构建顺序是:
- [INFO] Reactor Build Order:
- [INFO]
- [INFO] b2b-order-service [jar]
- [INFO] b2b-order [pom]
- [INFO] b2b [pom]
在仔细看一下上面2条命令的差别,后面的命令多了-rf b2b-order/b2b-order-service
,具体过程如下:
会先执行下面命令
mvn clean install
反应堆会计算出需要构件的模块顺序,如下:
- [INFO] Reactor Build Order:
- [INFO]
- [INFO] b2b-account-api [jar]
- [INFO] b2b-account-service [jar]
- [INFO] b2b-account [pom]
- [INFO] b2b-order-api [jar]
- [INFO] b2b-order-service [jar]
- [INFO] b2b-order [pom]
- [INFO] b2b [pom]
-rf b2b-order/b2b-order-service
对上面的反应堆构件顺序进行裁剪,将b2b-order/b2b-order-service
前面的部分干掉,从b2b-order/b2b-order-service
开始执行构建操作,所以剩下了3个需要构建的模块。
需要掌握mvn
命令中-pl、-am、-amd、-rf
的各种用法
注意-pl
后面的参数的写法:模块相对路径、或者[groupId].artifactId
还是那句话,上面这些用法大家会经常用到的,建议大家下去了多练练。看和操作,所获取到的是不能比的,看的过程中可能觉得一切都知道了,但是实际操作就不一样了,可能中间会遇到各种问题,然后自己会想办法解决这些问题,领会和学到的东西是不一样的!