❤️MAVEN专题之八、大型Maven项目,快速按需任意构建,必备神技能!相知恨晚!

小明的学习圈子2023-12-23后端maven成神之路

maven系列目标:从入门开始开始掌握一个高级开发所需要的maven技能。

这是mavenopen in new window系列第8篇。

整个maven系列的内容前后是有依赖的,如果之前没有接触过maven,建议从第一篇看起,本文尾部有maven完整系列的连接。

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。

需求背景

我们需要做一个电商项目,一般都会做成微服务open in new window的形式,按业务进行划分,本次我们主要以账户业务订单业务为例,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

b2b-account

账户模块,其中包含2个小模块:b2b-account-api和b2b-account-service

b2b-account-api

账户模块对外暴露的接口部分,以供外部调用

b2b-account-service

账户模块具体业务实现,依赖于b2b-account-api模块

b2b-order

订单模块,也是包含2个小模块:b2b-order-api和b2b-order-service

b2b-order-api

订单模块对外暴露的接口部分,以供外部调用

b2b-order-service

订单模块具体业务实现,依赖2个模块b2b-order-api、b2b-account-api

搭建项目结构

我们按照上面的需求,使用maven搭建项目结构,具体过程如下。

创建b2b项目

打开idea,点击File->New->Project,如下图:

img

选择Maven,如下图:

img

点击上图的Next,输入坐标信息,如下图:

img

点击上图的Next,输入Project Nameb2b,如下图:

img

点击上图的Finish,完成项目的创建,如下图:

img

删除下图中无用的代码:

img

变成了下面这样:

img

配置一下idea的maven环境,点击File->Settings,如下图:

img

点击上面的OK完成配置。

在b2b下创建b2b-account模块

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:

img

点击File->New->Module,如下图:

img

选择Maven,如下图:

img

点击Next,如下图:

img

点击上面第二个...,将Parent置为None,如下图:

img

img

img

输入坐标信息,如下图:

img

点击上图中的Next,输入Project nameb2b-account,如下图:

img

点击Finish,完成b2b-account模块的创建,如下图:

img

删除b2b-accountsrc目录,如下图:

img

项目结构变成了下面这样:

img

在b2b-account模块下面创建b2b-account-api模块

选中b2b-account,如下图:

img

点击File->New->Module,如下图:

img

选择Maven,如下图:

img

点击上图中的Next,如下图:

img

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:

img

img

img

输入坐标信息,如下图:

img

点击Next,默认如下图:

img

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:

img

点击Finish,完成创建,如下图:

img

在b2b-account模块下创建b2b-account-service模块

这个过程参考在b2b-account模块下面创建b2b-account-api模块

在b2b下创建b2b-order模块

这个过程参考在b2b下创建b2b-account模块

在b2b-order模块下面创建b2b-order-api模块

这个过程参考在b2b-account模块下面创建b2b-account-api模块

在b2b-order模块下面创建b2b-order-service模块

这个过程参考在b2b-account模块下面创建b2b-account-api模块

项目结构创建成功

上面都创建成功之后,项目结构如下图

img

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。

引入项目依赖

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>

此时每个模块pom.xml如下

b2b/pom.xml

    <?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>

b2b-account/pom.xml

    <?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>

b2b-account-api/pom.xml

    <?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>

b2b-account-service/pom.xml

    <?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>

b2b-order/pom.xml

    <?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>

b2b-order-api/pom.xml

    <?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>

b2b-order-service/pom.xml

    <?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_accountb2b_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。

反应堆

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:

1     [INFO] Reactor Build Order:
2     [INFO]
3     [INFO] b2b-account-api                                                    [jar]
4     [INFO] b2b-account-service                                                [jar]
5     [INFO] b2b-account                                                        [pom]
6     [INFO] b2b-order-api                                                      [jar]
7     [INFO] b2b-order-service                                                  [jar]
8     [INFO] b2b-order                                                          [pom]
9     [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。

按需随意构建

有这样的一种场景:b2b-account-apib2b-account-serviceb2b-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:

 1     D:\code\IdeaProjects\b2b>mvn -h
 2     usage: mvn [options] [<goal(s)>] [<phase(s)>]
 3     Options:
 4      -am,--also-make                        If project list is specified, also
 5                                             build projects required by the
 6                                             list
 7      -amd,--also-make-dependents            If project list is specified, also
 8                                             build projects that depend on
 9                                             projects on the list
10      -B,--batch-mode                        Run in non-interactive (batch)
11                                             mode (disables output color)
12      -b,--builder <arg>                     The id of the build strategy to
13                                             use
14      -C,--strict-checksums                  Fail the build if checksums don't
15                                             match
16      -c,--lax-checksums                     Warn if checksums don't match
17      -cpu,--check-plugin-updates            Ineffective, only kept for
18                                             backward compatibility
19      -D,--define <arg>                      Define a system property
20      -e,--errors                            Produce execution error messages
21      -emp,--encrypt-master-password <arg>   Encrypt master security password
22      -ep,--encrypt-password <arg>           Encrypt server password
23      -f,--file <arg>                        Force the use of an alternate POM
24                                             file (or directory with pom.xml)
25      -fae,--fail-at-end                     Only fail the build afterwards;
26                                             allow all non-impacted builds to
27                                             continue
28      -ff,--fail-fast                        Stop at first failure in
29                                             reactorized builds
30      -fn,--fail-never                       NEVER fail the build, regardless
31                                             of project result
32      -gs,--global-settings <arg>            Alternate path for the global
33                                             settings file
34      -gt,--global-toolchains <arg>          Alternate path for the global
35                                             toolchains file
36      -h,--help                              Display help information
37      -l,--log-file <arg>                    Log file where all build output
38                                             will go (disables output color)
39      -llr,--legacy-local-repository         Use Maven 2 Legacy Local
40                                             Repository behaviour, ie no use of
41                                             _remote.repositories. Can also be
42                                             activated by using
43                                             -Dmaven.legacyLocalRepo=true
44      -N,--non-recursive                     Do not recurse into sub-projects
45      -npr,--no-plugin-registry              Ineffective, only kept for
46                                             backward compatibility
47      -npu,--no-plugin-updates               Ineffective, only kept for
48                                             backward compatibility
49      -nsu,--no-snapshot-updates             Suppress SNAPSHOT updates
50      -ntp,--no-transfer-progress            Do not display transfer progress
51                                             when downloading or uploading
52      -o,--offline                           Work offline
53      -P,--activate-profiles <arg>           Comma-delimited list of profiles
54                                             to activate
55      -pl,--projects <arg>                   Comma-delimited list of specified
56                                             reactor projects to build instead
57                                             of all projects. A project can be
58                                             specified by [groupId]:artifactId
59                                             or by its relative path
60      -q,--quiet                             Quiet output - only show errors
61      -rf,--resume-from <arg>                Resume reactor from specified
62                                             project
63      -s,--settings <arg>                    Alternate path for the user
64                                             settings file
65      -t,--toolchains <arg>                  Alternate path for the user
66                                             toolchains file
67      -T,--threads <arg>                     Thread count, for instance 2.0C
68                                             where C is core multiplied
69      -U,--update-snapshots                  Forces a check for missing
70                                             releases and updated snapshots on
71                                             remote repositories
72      -up,--update-plugins                   Ineffective, only kept for
73                                             backward compatibility
74      -v,--version                           Display version information
75      -V,--show-version                      Display version information
76                                             WITHOUT stopping build
77      -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:

-pl,--projects "<"arg">"

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

1     -pl 模块1相对路径 [,模块2相对路径] [,模块n相对路径]
2     -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

1     mvn clean install -pl b2b-account
2     mvn clean install -pl b2b-account/b2b-account-api
3     mvn clean install -pl b2b-account/b2b-account-api,b2b-account/b2b-account-service
4     mvn clean install -pl :b2b-account-api,b2b-order/b2b-order-api
5     mvn clean install -pl :b2b-account-api,:b2b-order-service

-rf,--resume-from "<"arg">"

从指定的模块恢复反应堆

-am,--also-make

同时构建所列模块的依赖模块

-amd,--also-make-dependents

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。

案例1

只构建p-account模块,运行命令

mvn clean install -pl b2b-account

效果如下:

 1     D:\code\IdeaProjects\b2b>mvn clean install -pl b2b-account
 2     [INFO] Scanning for projects...
 3     [INFO]
 4     [INFO] --------------------< com.javacode2018:b2b-account >--------------------
 5     [INFO] Building b2b-account 1.0-SNAPSHOT
 6     [INFO] --------------------------------[ pom ]---------------------------------
 7     [INFO]
 8     [INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ b2b-account ---
 9     [INFO]
10     [INFO] --- maven-install-plugin:2.4:install (default-install) @ b2b-account ---
11     [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
12     [INFO] ------------------------------------------------------------------------
13     [INFO] BUILD SUCCESS
14     [INFO] ------------------------------------------------------------------------
15     [INFO] Total time:  0.907 s
16     [INFO] Finished at: 2019-11-20T16:12:51+08:00
17     [INFO] ------------------------------------------------------------------------

可以看到只构建了b2b-account

案例2

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:

 1     D:\code\IdeaProjects\b2b>mvn clean install -pl b2b-account/b2b-account-api
 2     [INFO] Scanning for projects...
 3     [INFO]
 4     [INFO] ------------------< com.javacode2018:b2b-account-api >------------------
 5     [INFO] Building b2b-account-api 1.0-SNAPSHOT
 6     [INFO] --------------------------------[ jar ]---------------------------------
 7     [INFO]
 8     [INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ b2b-account-api ---
 9     [INFO] Deleting D:\code\IdeaProjects\b2b\b2b-account\b2b-account-api\target
10     [INFO]
11     [INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ b2b-account-api ---
12     [WARNING] Using platform encoding (GBK actually) to copy filtered resources, i.e. build is platform dependent!
13     [INFO] Copying 0 resource
14     [INFO]
15     [INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ b2b-account-api ---
16     [INFO] Nothing to compile - all classes are up to date
17     [INFO]
18     [INFO] --- maven-resources-plugin:2.6:testResources (default-testResources) @ b2b-account-api ---
19     [WARNING] Using platform encoding (GBK actually) to copy filtered resources, i.e. build is platform dependent!
20     [INFO] skip non existing resourceDirectory D:\code\IdeaProjects\b2b\b2b-account\b2b-account-api\src\test\resources
21     [INFO]
22     [INFO] --- maven-compiler-plugin:3.1:testCompile (default-testCompile) @ b2b-account-api ---
23     [INFO] Nothing to compile - all classes are up to date
24     [INFO]
25     [INFO] --- maven-surefire-plugin:2.12.4:test (default-test) @ b2b-account-api ---
26     [INFO] No tests to run.
27     [INFO]
28     [INFO] --- maven-jar-plugin:2.4:jar (default-jar) @ b2b-account-api ---
29     [INFO] Building jar: D:\code\IdeaProjects\b2b\b2b-account\b2b-account-api\target\b2b-account-api-1.0-SNAPSHOT.jar
30     [INFO]
31     [INFO] --- maven-install-plugin:2.4:install (default-install) @ b2b-account-api ---
32     [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
33     [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
34     [INFO] ------------------------------------------------------------------------
35     [INFO] BUILD SUCCESS
36     [INFO] ------------------------------------------------------------------------
37     [INFO] Total time:  2.853 s
38     [INFO] Finished at: 2019-11-20T16:14:37+08:00
39     [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

案例3

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:

 1     D:\code\IdeaProjects\b2b>mvn clean install -pl b2b-account/b2b-account-api,b2b-order/b2b-order-api
 2     [INFO] Scanning for projects...
 3     [INFO] ------------------------------------------------------------------------
 4     [INFO] Reactor Build Order:
 5     [INFO]
 6     [INFO] b2b-account-api                                                    [jar]
 7     [INFO] b2b-order-api                                                      [jar]
 8     [INFO]
 9     [INFO] ------------------< com.javacode2018:b2b-account-api >------------------
10     [INFO] Building b2b-account-api 1.0-SNAPSHOT                              [1/2]
11     [INFO] --------------------------------[ jar ]---------------------------------
12     [INFO]
13     [INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ b2b-account-api ---
14     [INFO] Deleting D:\code\IdeaProjects\b2b\b2b-account\b2b-account-api\target
15     [INFO]
16     [INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ b2b-account-api ---
17     [WARNING] Using platform encoding (GBK actually) to copy filtered resources, i.e. build is platform dependent!
18     [INFO] Copying 0 resource
19     [INFO]
20     [INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ b2b-account-api ---
21     [INFO] Nothing to compile - all classes are up to date
22     [INFO]
23     [INFO] --- maven-resources-plugin:2.6:testResources (default-testResources) @ b2b-account-api ---
24     [WARNING] Using platform encoding (GBK actually) to copy filtered resources, i.e. build is platform dependent!
25     [INFO] skip non existing resourceDirectory D:\code\IdeaProjects\b2b\b2b-account\b2b-account-api\src\test\resources
26     [INFO]
27     [INFO] --- maven-compiler-plugin:3.1:testCompile (default-testCompile) @ b2b-account-api ---
28     [INFO] Nothing to compile - all classes are up to date
29     [INFO]
30     [INFO] --- maven-surefire-plugin:2.12.4:test (default-test) @ b2b-account-api ---
31     [INFO] No tests to run.
32     [INFO]
33     [INFO] --- maven-jar-plugin:2.4:jar (default-jar) @ b2b-account-api ---
34     [INFO] Building jar: D:\code\IdeaProjects\b2b\b2b-account\b2b-account-api\target\b2b-account-api-1.0-SNAPSHOT.jar
35     [INFO]
36     [INFO] --- maven-install-plugin:2.4:install (default-install) @ b2b-account-api ---
37     [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
38     [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
39     [INFO]
40     [INFO] -------------------< com.javacode2018:b2b-order-api >-------------------
41     [INFO] Building b2b-order-api 1.0-SNAPSHOT                                [2/2]
42     [INFO] --------------------------------[ jar ]---------------------------------
43     [INFO]
44     [INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ b2b-order-api ---
45     [INFO] Deleting D:\code\IdeaProjects\b2b\b2b-order\b2b-order-api\target
46     [INFO]
47     [INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ b2b-order-api ---
48     [WARNING] Using platform encoding (GBK actually) to copy filtered resources, i.e. build is platform dependent!
49     [INFO] Copying 0 resource
50     [INFO]
51     [INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ b2b-order-api ---
52     [INFO] Nothing to compile - all classes are up to date
53     [INFO]
54     [INFO] --- maven-resources-plugin:2.6:testResources (default-testResources) @ b2b-order-api ---
55     [WARNING] Using platform encoding (GBK actually) to copy filtered resources, i.e. build is platform dependent!
56     [INFO] skip non existing resourceDirectory D:\code\IdeaProjects\b2b\b2b-order\b2b-order-api\src\test\resources
57     [INFO]
58     [INFO] --- maven-compiler-plugin:3.1:testCompile (default-testCompile) @ b2b-order-api ---
59     [INFO] Nothing to compile - all classes are up to date
60     [INFO]
61     [INFO] --- maven-surefire-plugin:2.12.4:test (default-test) @ b2b-order-api ---
62     [INFO] No tests to run.
63     [INFO]
64     [INFO] --- maven-jar-plugin:2.4:jar (default-jar) @ b2b-order-api ---
65     [INFO] Building jar: D:\code\IdeaProjects\b2b\b2b-order\b2b-order-api\target\b2b-order-api-1.0-SNAPSHOT.jar
66     [INFO]
67     [INFO] --- maven-install-plugin:2.4:install (default-install) @ b2b-order-api ---
68     [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
69     [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
70     [INFO] ------------------------------------------------------------------------
71     [INFO] Reactor Summary for b2b-account-api 1.0-SNAPSHOT:
72     [INFO]
73     [INFO] b2b-account-api .................................... SUCCESS [  2.874 s]
74     [INFO] b2b-order-api ...................................... SUCCESS [  0.393 s]
75     [INFO] ------------------------------------------------------------------------
76     [INFO] BUILD SUCCESS
77     [INFO] ------------------------------------------------------------------------
78     [INFO] Total time:  3.554 s
79     [INFO] Finished at: 2019-11-20T16:15:57+08:00
80     [INFO] ------------------------------------------------------------------------

上面输出中可以看到只构建了2个目标模块。

案例4

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:

1     b2b-account-api
2     b2b-account-service
3     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:

  1     D:\code\IdeaProjects\b2b>mvn clean install -pl b2b-account/b2b-account-api -amd
  2     [INFO] Scanning for projects...
  3     [INFO] ------------------------------------------------------------------------
  4     [INFO] Reactor Build Order:
  5     [INFO]
  6     [INFO] b2b-account-api                                                    [jar]
  7     [INFO] b2b-account-service                                                [jar]
  8     [INFO] b2b-order-service                                                  [jar]
  9     [INFO]
 10     [INFO] ------------------< com.javacode2018:b2b-account-api >------------------
 11     [INFO] Building b2b-account-api 1.0-SNAPSHOT                              [1/3]
 12     [INFO] --------------------------------[ jar ]---------------------------------
 13     [INFO]
 14     [INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ b2b-account-api ---
 15     [INFO] Deleting D:\code\IdeaProjects\b2b\b2b-account\b2b-account-api\target
 16     [INFO]
 17     [INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ b2b-account-api ---
 18     [WARNING] Using platform encoding (GBK actually) to copy filtered resources, i.e. build is platform dependent!
 19     [INFO] Copying 0 resource
 20     [INFO]
 21     [INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ b2b-account-api ---
 22     [INFO] Nothing to compile - all classes are up to date
 23     [INFO]
 24     [INFO] --- maven-resources-plugin:2.6:testResources (default-testResources) @ b2b-account-api ---
 25     [WARNING] Using platform encoding (GBK actually) to copy filtered resources, i.e. build is platform dependent!
 26     [INFO] skip non existing resourceDirectory D:\code\IdeaProjects\b2b\b2b-account\b2b-account-api\src\test\resources
 27     [INFO]
 28     [INFO] --- maven-compiler-plugin:3.1:testCompile (default-testCompile) @ b2b-account-api ---
 29     [INFO] Nothing to compile - all classes are up to date
 30     [INFO]
 31     [INFO] --- maven-surefire-plugin:2.12.4:test (default-test) @ b2b-account-api ---
 32     [INFO] No tests to run.
 33     [INFO]
 34     [INFO] --- maven-jar-plugin:2.4:jar (default-jar) @ b2b-account-api ---
 35     [INFO] Building jar: D:\code\IdeaProjects\b2b\b2b-account\b2b-account-api\target\b2b-account-api-1.0-SNAPSHOT.jar
 36     [INFO]
 37     [INFO] --- maven-install-plugin:2.4:install (default-install) @ b2b-account-api ---
 38     [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
 39     [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
 40     [INFO]
 41     [INFO] ----------------< com.javacode2018:b2b-account-service >----------------
 42     [INFO] Building b2b-account-service 1.0-SNAPSHOT                          [2/3]
 43     [INFO] --------------------------------[ jar ]---------------------------------
 44     [INFO]
 45     [INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ b2b-account-service ---
 46     [INFO] Deleting D:\code\IdeaProjects\b2b\b2b-account\b2b-account-service\target
 47     [INFO]
 48     [INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ b2b-account-service ---
 49     [WARNING] Using platform encoding (GBK actually) to copy filtered resources, i.e. build is platform dependent!
 50     [INFO] Copying 0 resource
 51     [INFO]
 52     [INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ b2b-account-service ---
 53     [INFO] Nothing to compile - all classes are up to date
 54     [INFO]
 55     [INFO] --- maven-resources-plugin:2.6:testResources (default-testResources) @ b2b-account-service ---
 56     [WARNING] Using platform encoding (GBK actually) to copy filtered resources, i.e. build is platform dependent!
 57     [INFO] skip non existing resourceDirectory D:\code\IdeaProjects\b2b\b2b-account\b2b-account-service\src\test\resources
 58     [INFO]
 59     [INFO] --- maven-compiler-plugin:3.1:testCompile (default-testCompile) @ b2b-account-service ---
 60     [INFO] Nothing to compile - all classes are up to date
 61     [INFO]
 62     [INFO] --- maven-surefire-plugin:2.12.4:test (default-test) @ b2b-account-service ---
 63     [INFO] No tests to run.
 64     [INFO]
 65     [INFO] --- maven-jar-plugin:2.4:jar (default-jar) @ b2b-account-service ---
 66     [INFO] Building jar: D:\code\IdeaProjects\b2b\b2b-account\b2b-account-service\target\b2b-account-service-1.0-SNAPSHOT.jar
 67     [INFO]
 68     [INFO] --- maven-install-plugin:2.4:install (default-install) @ b2b-account-service ---
 69     [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
 70     [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
 71     [INFO]
 72     [INFO] -----------------< com.javacode2018:b2b-order-service >-----------------
 73     [INFO] Building b2b-order-service 1.0-SNAPSHOT                            [3/3]
 74     [INFO] --------------------------------[ jar ]---------------------------------
 75     [INFO]
 76     [INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ b2b-order-service ---
 77     [INFO] Deleting D:\code\IdeaProjects\b2b\b2b-order\b2b-order-service\target
 78     [INFO]
 79     [INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ b2b-order-service ---
 80     [WARNING] Using platform encoding (GBK actually) to copy filtered resources, i.e. build is platform dependent!
 81     [INFO] Copying 0 resource
 82     [INFO]
 83     [INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ b2b-order-service ---
 84     [INFO] Nothing to compile - all classes are up to date
 85     [INFO]
 86     [INFO] --- maven-resources-plugin:2.6:testResources (default-testResources) @ b2b-order-service ---
 87     [WARNING] Using platform encoding (GBK actually) to copy filtered resources, i.e. build is platform dependent!
 88     [INFO] skip non existing resourceDirectory D:\code\IdeaProjects\b2b\b2b-order\b2b-order-service\src\test\resources
 89     [INFO]
 90     [INFO] --- maven-compiler-plugin:3.1:testCompile (default-testCompile) @ b2b-order-service ---
 91     [INFO] Nothing to compile - all classes are up to date
 92     [INFO]
 93     [INFO] --- maven-surefire-plugin:2.12.4:test (default-test) @ b2b-order-service ---
 94     [INFO] No tests to run.
 95     [INFO]
 96     [INFO] --- maven-jar-plugin:2.4:jar (default-jar) @ b2b-order-service ---
 97     [INFO] Building jar: D:\code\IdeaProjects\b2b\b2b-order\b2b-order-service\target\b2b-order-service-1.0-SNAPSHOT.jar
 98     [INFO]
 99     [INFO] --- maven-install-plugin:2.4:install (default-install) @ b2b-order-service ---
100     [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
101     [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
102     [INFO] ------------------------------------------------------------------------
103     [INFO] Reactor Summary for b2b-account-api 1.0-SNAPSHOT:
104     [INFO]
105     [INFO] b2b-account-api .................................... SUCCESS [  2.440 s]
106     [INFO] b2b-account-service ................................ SUCCESS [  0.381 s]
107     [INFO] b2b-order-service .................................. SUCCESS [  0.364 s]
108     [INFO] ------------------------------------------------------------------------
109     [INFO] BUILD SUCCESS
110     [INFO] ------------------------------------------------------------------------
111     [INFO] Total time:  3.508 s
112     [INFO] Finished at: 2019-11-20T16:05:00+08:00
113     [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:

1     b2b-account-service
2     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:

1     [INFO] Reactor Build Order:
2     [INFO]
3     [INFO] b2b-account-api                                                    [jar]
4     [INFO] b2b-account-service                                                [jar]
5     [INFO] b2b-order-service                                                  [jar]

然后maven会依次对他们执行:

mvn clean install

案例5

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-apib2b-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:

  1     D:\code\IdeaProjects\b2b>mvn clean install -pl b2b-order/b2b-order-service -am
  2     [INFO] Scanning for projects...
  3     [INFO] ------------------------------------------------------------------------
  4     [INFO] Reactor Build Order:
  5     [INFO]
  6     [INFO] b2b-account-api                                                    [jar]
  7     [INFO] b2b-order-api                                                      [jar]
  8     [INFO] b2b-order-service                                                  [jar]
  9     [INFO]
 10     [INFO] ------------------< com.javacode2018:b2b-account-api >------------------
 11     [INFO] Building b2b-account-api 1.0-SNAPSHOT                              [1/3]
 12     [INFO] --------------------------------[ jar ]---------------------------------
 13     [INFO]
 14     [INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ b2b-account-api ---
 15     [INFO] Deleting D:\code\IdeaProjects\b2b\b2b-account\b2b-account-api\target
 16     [INFO]
 17     [INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ b2b-account-api ---
 18     [WARNING] Using platform encoding (GBK actually) to copy filtered resources, i.e. build is platform dependent!
 19     [INFO] Copying 0 resource
 20     [INFO]
 21     [INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ b2b-account-api ---
 22     [INFO] Nothing to compile - all classes are up to date
 23     [INFO]
 24     [INFO] --- maven-resources-plugin:2.6:testResources (default-testResources) @ b2b-account-api ---
 25     [WARNING] Using platform encoding (GBK actually) to copy filtered resources, i.e. build is platform dependent!
 26     [INFO] skip non existing resourceDirectory D:\code\IdeaProjects\b2b\b2b-account\b2b-account-api\src\test\resources
 27     [INFO]
 28     [INFO] --- maven-compiler-plugin:3.1:testCompile (default-testCompile) @ b2b-account-api ---
 29     [INFO] Nothing to compile - all classes are up to date
 30     [INFO]
 31     [INFO] --- maven-surefire-plugin:2.12.4:test (default-test) @ b2b-account-api ---
 32     [INFO] No tests to run.
 33     [INFO]
 34     [INFO] --- maven-jar-plugin:2.4:jar (default-jar) @ b2b-account-api ---
 35     [INFO] Building jar: D:\code\IdeaProjects\b2b\b2b-account\b2b-account-api\target\b2b-account-api-1.0-SNAPSHOT.jar
 36     [INFO]
 37     [INFO] --- maven-install-plugin:2.4:install (default-install) @ b2b-account-api ---
 38     [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
 39     [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
 40     [INFO]
 41     [INFO] -------------------< com.javacode2018:b2b-order-api >-------------------
 42     [INFO] Building b2b-order-api 1.0-SNAPSHOT                                [2/3]
 43     [INFO] --------------------------------[ jar ]---------------------------------
 44     [INFO]
 45     [INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ b2b-order-api ---
 46     [INFO] Deleting D:\code\IdeaProjects\b2b\b2b-order\b2b-order-api\target
 47     [INFO]
 48     [INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ b2b-order-api ---
 49     [WARNING] Using platform encoding (GBK actually) to copy filtered resources, i.e. build is platform dependent!
 50     [INFO] Copying 0 resource
 51     [INFO]
 52     [INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ b2b-order-api ---
 53     [INFO] Nothing to compile - all classes are up to date
 54     [INFO]
 55     [INFO] --- maven-resources-plugin:2.6:testResources (default-testResources) @ b2b-order-api ---
 56     [WARNING] Using platform encoding (GBK actually) to copy filtered resources, i.e. build is platform dependent!
 57     [INFO] skip non existing resourceDirectory D:\code\IdeaProjects\b2b\b2b-order\b2b-order-api\src\test\resources
 58     [INFO]
 59     [INFO] --- maven-compiler-plugin:3.1:testCompile (default-testCompile) @ b2b-order-api ---
 60     [INFO] Nothing to compile - all classes are up to date
 61     [INFO]
 62     [INFO] --- maven-surefire-plugin:2.12.4:test (default-test) @ b2b-order-api ---
 63     [INFO] No tests to run.
 64     [INFO]
 65     [INFO] --- maven-jar-plugin:2.4:jar (default-jar) @ b2b-order-api ---
 66     [INFO] Building jar: D:\code\IdeaProjects\b2b\b2b-order\b2b-order-api\target\b2b-order-api-1.0-SNAPSHOT.jar
 67     [INFO]
 68     [INFO] --- maven-install-plugin:2.4:install (default-install) @ b2b-order-api ---
 69     [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
 70     [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
 71     [INFO]
 72     [INFO] -----------------< com.javacode2018:b2b-order-service >-----------------
 73     [INFO] Building b2b-order-service 1.0-SNAPSHOT                            [3/3]
 74     [INFO] --------------------------------[ jar ]---------------------------------
 75     [INFO]
 76     [INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ b2b-order-service ---
 77     [INFO] Deleting D:\code\IdeaProjects\b2b\b2b-order\b2b-order-service\target
 78     [INFO]
 79     [INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ b2b-order-service ---
 80     [WARNING] Using platform encoding (GBK actually) to copy filtered resources, i.e. build is platform dependent!
 81     [INFO] Copying 0 resource
 82     [INFO]
 83     [INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ b2b-order-service ---
 84     [INFO] Nothing to compile - all classes are up to date
 85     [INFO]
 86     [INFO] --- maven-resources-plugin:2.6:testResources (default-testResources) @ b2b-order-service ---
 87     [WARNING] Using platform encoding (GBK actually) to copy filtered resources, i.e. build is platform dependent!
 88     [INFO] skip non existing resourceDirectory D:\code\IdeaProjects\b2b\b2b-order\b2b-order-service\src\test\resources
 89     [INFO]
 90     [INFO] --- maven-compiler-plugin:3.1:testCompile (default-testCompile) @ b2b-order-service ---
 91     [INFO] Nothing to compile - all classes are up to date
 92     [INFO]
 93     [INFO] --- maven-surefire-plugin:2.12.4:test (default-test) @ b2b-order-service ---
 94     [INFO] No tests to run.
 95     [INFO]
 96     [INFO] --- maven-jar-plugin:2.4:jar (default-jar) @ b2b-order-service ---
 97     [INFO] Building jar: D:\code\IdeaProjects\b2b\b2b-order\b2b-order-service\target\b2b-order-service-1.0-SNAPSHOT.jar
 98     [INFO]
 99     [INFO] --- maven-install-plugin:2.4:install (default-install) @ b2b-order-service ---
100     [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
101     [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
102     [INFO] ------------------------------------------------------------------------
103     [INFO] Reactor Summary for b2b-account-api 1.0-SNAPSHOT:
104     [INFO]
105     [INFO] b2b-account-api .................................... SUCCESS [  2.509 s]
106     [INFO] b2b-order-api ...................................... SUCCESS [  0.343 s]
107     [INFO] b2b-order-service .................................. SUCCESS [  0.340 s]
108     [INFO] ------------------------------------------------------------------------
109     [INFO] BUILD SUCCESS
110     [INFO] ------------------------------------------------------------------------
111     [INFO] Total time:  3.455 s
112     [INFO] Finished at: 2019-11-20T16:46:45+08:00
113     [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:

1     b2b-account-api
2     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:

1     [INFO] Reactor Build Order:
2     [INFO]
3     [INFO] b2b-account-api                                                    [jar]
4     [INFO] b2b-order-api                                                      [jar]
5     [INFO] b2b-order-service                                                  [jar]

然后maven会依次对他们执行:

mvn clean install

案例6

分别执行下面2条mvn命令,先看一下效果:

1     mvn clean install
2     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:

1     [INFO] Reactor Build Order:
2     [INFO]
3     [INFO] b2b-account-api                                                    [jar]
4     [INFO] b2b-account-service                                                [jar]
5     [INFO] b2b-account                                                        [pom]
6     [INFO] b2b-order-api                                                      [jar]
7     [INFO] b2b-order-service                                                  [jar]
8     [INFO] b2b-order                                                          [pom]
9     [INFO] b2b                                                                [pom]

第2条命令,反应堆产生的构建顺序是:

1     [INFO] Reactor Build Order:
2     [INFO]
3     [INFO] b2b-order-service                                                  [jar]
4     [INFO] b2b-order                                                          [pom]
5     [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:

1     [INFO] Reactor Build Order:
2     [INFO]
3     [INFO] b2b-account-api                                                    [jar]
4     [INFO] b2b-account-service                                                [jar]
5     [INFO] b2b-account                                                        [pom]
6     [INFO] b2b-order-api                                                      [jar]
7     [INFO] b2b-order-service                                                  [jar]
8     [INFO] b2b-order                                                          [pom]
9     [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。

总结

  1. 需要掌握mvn命令中-pl、-am、-amd、-rf的各种用法
  2. 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!

来源:http://itsoku.com/course/2/69

Last Updated 2024/4/6 11:55:17