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第8篇：多模块任意构建，必备神技能
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<div style="display:none"></div> **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maven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： ```java 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：  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。 ### 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：  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：  ### 在b2b-account模块下面创建b2b-account-api模块 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：  ### 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  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： ```xml <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`${}`这种方式引用了。 b2b-order-service依赖2个模块`b2b-order-api、b2b-account-api`，所以在`b2b-order-service/pom.xml`中加入下面配置： ```xml <dependencies> <dependency> <groupId>${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 <?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 <?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 <?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 <?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>${project.version}</version> </dependency> </dependencies> </project> ``` #### b2b-order/pom.xml ```xml <?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.javacode2018</groupId> <artifactId>b2b-order</artifactId> <packaging>pom</packaging> <version>1.0-SNAPSHOT</version> <modules> <module>b2b-order-api</module> <module>b2b-order-service</module> </modules> </project> ``` #### b2b-order-api/pom.xml ```xml <?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.javacode2018</groupId> <artifactId>b2b-order-api</artifactId> <version>1.0-SNAPSHOT</version> </project> ``` #### b2b-order-service/pom.xml ```xml <?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.javacode2018</groupId> <artifactId>b2b-order-service</artifactId> <version>1.0-SNAPSHOT</version> <dependencies> <dependency> <groupId>${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。 ## 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： ```java 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： ```java [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。 ## 按需随意构建 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： ```shell 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： ### -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 ```java -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 ```java 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 ``` ### -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 ```java mvn clean install -pl b2b-account ``` 效果如下： ```shell 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`。 ## 案例2 只构建b2b-account-api模块，运行命令： ```java mvn clean install -pl b2b-account/b2b-account-api ``` 效果如下： ```java 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： ```java 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： ```java mvn clean install -pl b2b-account/b2b-account-api,b2b-order/b2b-order-api ``` 效果如下： ```java 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。 ## 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： ``` 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： ```java 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： ```java 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： ```java 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： ```java mvn clean install ``` ## 案例5 需求：我们来构建b2b-order-service，希望b2b-order-service依赖的构件也能被同时构建，b2b-order-service依赖于`b2b-account-api`和`b2b-order-api`，可能b2b-order-service会依赖的更多。 可以使用下面命令： ```java mvn clean install -pl b2b-order/b2b-order-service -am ``` 效果如下： ```java 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： ```java 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： ```java 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： ```java mvn clean install ``` ## 案例6 分别执行下面2条mvn命令，先看一下效果： ```java 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： ```java [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： ```java [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 ```java mvn clean install ``` 反应堆会计算出需要构件的模块顺序，如下： ```java [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。 ## 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！** <a style="display:none" target="_blank" href="https://mp.weixin.qq.com/s/_S1DD2JADnXvpexxaBwLLg" style="color:red; font-size:20px; font-weight:bold">继续收门徒，亲手带，月薪 4W 以下的可以来找我</a> ## 最新资料 1. <a href="https://mp.weixin.qq.com/s?__biz=MzkzOTI3Nzc0Mg==&mid=2247484964&idx=2&sn=c81bce2f26015ee0f9632ddc6c67df03&scene=21#wechat_redirect" target="_blank">尚硅谷 Java 学科全套教程（总 207.77GB）</a> 2. <a href="https://mp.weixin.qq.com/s?__biz=MzkwOTAyMTY2NA==&mid=2247484192&idx=1&sn=505f2faaa4cc911f553850667749bcbb&scene=21#wechat_redirect" target="_blank">2021 最新版 Java 微服务学习线路图 + 视频</a> 3. <a href="https://mp.weixin.qq.com/s?__biz=MzkwOTAyMTY2NA==&mid=2247484573&idx=1&sn=7f3d83892186c16c57bc0b99f03f1ffd&scene=21#wechat_redirect" target="_blank">阿里技术大佬整理的《Spring 学习笔记.pdf》</a> 4. <a href="https://mp.weixin.qq.com/s?__biz=MzkwOTAyMTY2NA==&mid=2247484544&idx=2&sn=c1dfe907cfaa5b9ae8e66fc247ccbe84&scene=21#wechat_redirect" target="_blank">阿里大佬的《MySQL 学习笔记高清.pdf》</a> 5. <a href="https://mp.weixin.qq.com/s?__biz=MzkwOTAyMTY2NA==&mid=2247485167&idx=1&sn=48d75c8e93e748235a3547f34921dfb7&scene=21#wechat_redirect" target="_blank">2021 版 java 高并发常见面试题汇总.pdf</a> 6. <a href="https://mp.weixin.qq.com/s?__biz=MzkwOTAyMTY2NA==&mid=2247485664&idx=1&sn=435f9f515a8f881642820d7790ad20ce&scene=21#wechat_redirect" target="_blank">Idea 快捷键大全.pdf</a> 
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