Maven系列第8篇：你的maven項目構建太慢了，我實在看不下去，帶你一塊兒磨刀！！多數使用maven的人都常常想要的一種功能，可是大多數人都不知道如何使用！！！
maven系列目標：從入門開始開始掌握一個高級開發所須要的maven技能。java
這是maven系列第8篇。mysql
整個maven系列的內容先後是有依賴的，若是以前沒有接觸過maven，建議從第一篇看起，本文尾部有maven完整系列的鏈接。react
本篇涉及到的內容屬於神技能，多數使用maven的人都常常想要的一種功能，可是大多數人都不知道如何使用，廢話很少說，上乾貨。sql
需求背景
咱們須要作一個電商項目，通常都會作成微服務的形式，按業務進行劃分，本次咱們主要以帳戶業務和訂單業務爲例，咱們將這兩塊業務分別做爲2個大的模塊來開發，而訂單模塊又會調用帳戶模塊中的接口，因此對帳戶模塊接口部分會有依賴。shell
咱們以maven來搭建項目，項目的目錄結構以下：apache
b2b
b2b-account
b2b-account-api
b2b-account-service
b2b-order
b2b-order-api
b2b-order-service
b2b-account
帳戶模塊，其中包含2個小模塊：b2b-account-api和b2b-account-serviceapi
b2b-account-api
帳戶模塊對外暴露的接口部分，以供外部調用緩存
b2b-account-service
帳戶模塊具體業務實現，依賴於b2b-account-api模塊併發
b2b-order
訂單模塊，也是包含2個小模塊：b2b-order-api和b2b-order-serviceless
b2b-order-api
訂單模塊對外暴露的接口部分，以供外部調用
b2b-order-service
訂單模塊具體業務實現，依賴2個模塊b2b-order-api、b2b-account-api
搭建項目結構
咱們按照上面的需求，使用maven搭建項目結構，具體過程以下。
建立b2b項目
打開idea，點擊File->New->Project，以下圖：
選擇Maven，以下圖：
點擊上圖的Next，輸入座標信息，以下圖：
點擊上圖的Next，輸入Project Name爲b2b，以下圖：
點擊上圖的Finish，完成項目的建立，以下圖：
刪除下圖中無用的代碼：
變成了下面這樣：
配置一下idea的maven環境，點擊File->Settings，以下圖：
點擊上面的OK完成配置。
在b2b下建立b2b-account模塊
注意這裏是建立模塊，不是項目了，注意下面的操做過程。
選中b2b項目目錄，以下圖：
點擊File->New->Module，以下圖：
選擇Maven，以下圖：
點擊Next，以下圖：
點擊上面第二個...，將Parent置爲None，以下圖：
輸入座標信息，以下圖：
點擊上圖中的Next，輸入Project name爲b2b-account，以下圖：
點擊Finish，完成b2b-account模塊的建立，以下圖：
刪除b2b-account中src目錄，以下圖：
項目結構變成了下面這樣：
在b2b-account模塊下面建立b2b-account-api模塊
選中b2b-account，以下圖：
點擊File->New->Module，以下圖：
選擇Maven，以下圖：
點擊上圖中的Next，以下圖：
將上面的Add as module to設置爲b2b-account模塊，表示新增的這個模塊被b2b-account聚合進行管理。
點擊Parent後面的...，選擇None，將Parent對應的值置爲None。
以下圖：
輸入座標信息，以下圖：
點擊Next，默認以下圖：
咱們須要對上面3個輸入框的值進行修改，修改爲下面這樣：
點擊Finish，完成建立，以下圖：
在b2b-account模塊下建立b2b-account-service模塊
這個過程參考在b2b-account模塊下面建立b2b-account-api模塊。
在b2b下建立b2b-order模塊
這個過程參考在b2b下建立b2b-account模塊。
在b2b-order模塊下面建立b2b-order-api模塊
這個過程參考在b2b-account模塊下面建立b2b-account-api模塊。
在b2b-order模塊下面建立b2b-order-service模塊
這個過程參考在b2b-account模塊下面建立b2b-account-api模塊。
項目結構建立成功
上面都建立成功以後，項目結構以下圖
參與過大型maven項目開發的是否是很熟悉很親切，多數互聯網項目的maven結構就是這樣一大片maven模塊。
引入項目依賴
b2b-account-service依賴於b2b-account-api模塊，因此在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>
因爲項目的
groupId,version都是同樣的，因此直接經過${}這種方式引用了。
b2b-order-service依賴2個模塊b2b-order-api、b2b-account-api，因此在b2b-order-service/pom.xml中加入下面配置：
<dependencies>
<dependency>
<groupId>${project.groupId}</groupId>
<artifactId>b2b-account-api</artifactId>
<version>${project.version}</version>
</dependency>
<dependency>
<groupId>${project.groupId}</groupId>
<artifactId>b2b-order-api</artifactId>
<version>${project.version}</version>
</dependency>
</dependencies>
此時每一個模塊pom.xml以下
b2b/pom.xml
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.javacode2018</groupId>
<artifactId>b2b</artifactId>
<packaging>pom</packaging>
<version>1.0-SNAPSHOT</version>
<modules>
<module>b2b-account</module>
<module>b2b-order</module>
</modules>
</project>
b2b-account/pom.xml
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.javacode2018</groupId>
<artifactId>b2b-account</artifactId>
<packaging>pom</packaging>
<version>1.0-SNAPSHOT</version>
<modules>
<module>b2b-account-api</module>
<module>b2b-account-service</module>
</modules>
</project>
b2b-account-api/pom.xml
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.javacode2018</groupId>
<artifactId>b2b-account-api</artifactId>
<version>1.0-SNAPSHOT</version>
</project>
b2b-account-service/pom.xml
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.javacode2018</groupId>
<artifactId>b2b-account-service</artifactId>
<version>1.0-SNAPSHOT</version>
<dependencies>
<dependency>
<groupId>${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：上面項目的結構屬於父子結構，使用maven中聚合的方式進行管理的，對應聚合不是太瞭解的，能夠看上篇文章有詳細介紹。
b2b中包含了2個子模塊
b2b_account和b2b_order，這3個package都是pom。b2b_account中包含了2個子模塊，2個子模塊package是默認的jar類型。
b2b_order中包含了2個子模塊，2個子模塊package是默認的jar類型。
反應堆
上面項目都開發好了，咱們須要安裝到本地倉庫，通常狀況下，咱們會這麼作，在b2b/pom.xml所在目錄執行下面命令：
mvn clean install
咱們來感覺一下這個命令的效果：
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] ------------------------------------------------------------------------
注意上面有這樣的輸出：
[INFO] Reactor Build Order: [INFO] [INFO] b2b-account-api [jar] [INFO] b2b-account-service [jar] [INFO] b2b-account [pom] [INFO] b2b-order-api [jar] [INFO] b2b-order-service [jar] [INFO] b2b-order [pom] [INFO] b2b [pom]
maven會根據模塊之間的依賴關係，而後會獲得全部模塊的構建順序，上面共有7個pom.xml文件，也就是7個maven構件，按照上面列出的順序依次進行構建。
能夠看到b2b-account-api是被其餘一些模塊依賴的，因此這個放在了第一個。
mvn命令對多模塊構件時，會根據模塊的依賴關係而獲得模塊的構建順序，這個功能就是maven的反應堆（reactor）作的事情，反應堆會根據模塊之間的依賴關係、聚合關係、繼承關係等等，從而計算得出一個合理的模塊構建順序，因此反應堆的功能是至關強大的。
按需隨意構建
有這樣的一種場景：b2b-account-api被b2b-account-service和b2b-order-service依賴了，因此當b2b-account-api有修改的時候，咱們但願他們3個都可以被從新構建一次，而不是去對全部的模塊都進行從新構建，咱們只但願被影響的模塊都可以參與從新構建，你們有什麼好的辦法？
上面列出的只是2個模塊的功能，真正的電商項目還有不少模塊，若是每次修改一個模塊，咱們都去從新打包全部的模塊，這個構建過程耗時是很是久的，只能乾等着，咱們須要的是按需構建，須要構建哪些模塊讓咱們本身可以隨意指定，這樣也能夠加快構建的速度，因此咱們須要這樣的功能
maven反應堆幫咱們考慮到了這種狀況，mvn命令提供了一些功能能夠幫咱們實現這些操做，咱們看一下mvn的幫助文檔，mvn -h能夠查看幫助，以下：
D:\code\IdeaProjects\b2b>mvn -h
usage: mvn [options] [<goal(s)>] [<phase(s)>]
Options:
-am,--also-make If project list is specified, also
build projects required by the
list
-amd,--also-make-dependents If project list is specified, also
build projects that depend on
projects on the list
-B,--batch-mode Run in non-interactive (batch)
mode (disables output color)
-b,--builder <arg> The id of the build strategy to
use
-C,--strict-checksums Fail the build if checksums don't
match
-c,--lax-checksums Warn if checksums don't match
-cpu,--check-plugin-updates Ineffective, only kept for
backward compatibility
-D,--define <arg> Define a system property
-e,--errors Produce execution error messages
-emp,--encrypt-master-password <arg> Encrypt master security password
-ep,--encrypt-password <arg> Encrypt server password
-f,--file <arg> Force the use of an alternate POM
file (or directory with pom.xml)
-fae,--fail-at-end Only fail the build afterwards;
allow all non-impacted builds to
continue
-ff,--fail-fast Stop at first failure in
reactorized builds
-fn,--fail-never NEVER fail the build, regardless
of project result
-gs,--global-settings <arg> Alternate path for the global
settings file
-gt,--global-toolchains <arg> Alternate path for the global
toolchains file
-h,--help Display help information
-l,--log-file <arg> Log file where all build output
will go (disables output color)
-llr,--legacy-local-repository Use Maven 2 Legacy Local
Repository behaviour, ie no use of
_remote.repositories. Can also be
activated by using
-Dmaven.legacyLocalRepo=true
-N,--non-recursive Do not recurse into sub-projects
-npr,--no-plugin-registry Ineffective, only kept for
backward compatibility
-npu,--no-plugin-updates Ineffective, only kept for
backward compatibility
-nsu,--no-snapshot-updates Suppress SNAPSHOT updates
-ntp,--no-transfer-progress Do not display transfer progress
when downloading or uploading
-o,--offline Work offline
-P,--activate-profiles <arg> Comma-delimited list of profiles
to activate
-pl,--projects <arg> Comma-delimited list of specified
reactor projects to build instead
of all projects. A project can be
specified by [groupId]:artifactId
or by its relative path
-q,--quiet Quiet output - only show errors
-rf,--resume-from <arg> Resume reactor from specified
project
-s,--settings <arg> Alternate path for the user
settings file
-t,--toolchains <arg> Alternate path for the user
toolchains file
-T,--threads <arg> Thread count, for instance 2.0C
where C is core multiplied
-U,--update-snapshots Forces a check for missing
releases and updated snapshots on
remote repositories
-up,--update-plugins Ineffective, only kept for
backward compatibility
-v,--version Display version information
-V,--show-version Display version information
WITHOUT stopping build
-X,--debug Produce execution debug output
上面列出了mvn命令後面的一些選項，有幾個選項本次咱們須要用到，以下：
-pl,--projects <arg>
構件指定的模塊，arg表示多個模塊，之間用逗號分開，模塊有兩種寫法
-pl 模塊1相對路徑 [,模塊2相對路徑] [,模塊n相對路徑] -pl [模塊1的groupId]:模塊1的artifactId [,[模塊2的groupId]:模塊2的artifactId] [,[模塊n的groupId]:模塊n的artifactId]
舉例：
下面命令都是在b2b/pom.xml來運行
mvn clean install -pl b2b-account mvn clean install -pl b2b-account/b2b-account-api mvn clean install -pl b2b-account/b2b-account-api,b2b-account/b2b-account-service mvn clean install -pl :b2b-account-api,b2b-order/b2b-order-api mvn clean install -pl :b2b-account-api,:b2b-order-service
-rf,--resume-from <arg>
從指定的模塊恢復反應堆
-am,--also-make
同時構建所列模塊的依賴模塊
-amd,--also-make-dependents
同時構件依賴於所列模塊的模塊
下面咱們經過6個案例細說上面這些用法。
注意：下面全部案例都在b2b/pom.xml所在目錄執行。
案例1
只構建p-account模塊，運行命令
mvn clean install -pl b2b-account
效果以下：
D:\code\IdeaProjects\b2b>mvn clean install -pl b2b-account [INFO] Scanning for projects... [INFO] [INFO] --------------------< com.javacode2018:b2b-account >-------------------- [INFO] Building b2b-account 1.0-SNAPSHOT [INFO] --------------------------------[ pom ]--------------------------------- [INFO] [INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ b2b-account --- [INFO] [INFO] --- maven-install-plugin:2.4:install (default-install) @ b2b-account --- [INFO] Installing D:\code\IdeaProjects\b2b\b2b-account\pom.xml to C:\Users\Think\.m2\repository\com\javacode2018\b2b-account\1.0-SNAPSHOT\b2b-account-1.0-SNAPSHOT.pom [INFO] ------------------------------------------------------------------------ [INFO] BUILD SUCCESS [INFO] ------------------------------------------------------------------------ [INFO] Total time: 0.907 s [INFO] Finished at: 2019-11-20T16:12:51+08:00 [INFO] ------------------------------------------------------------------------
能夠看到只構建了b2b-account。
案例2
只構建b2b-account-api模塊，運行命令：
mvn clean install -pl b2b-account/b2b-account-api
效果以下：
D:\code\IdeaProjects\b2b>mvn clean install -pl b2b-account/b2b-account-api [INFO] Scanning for projects... [INFO] [INFO] ------------------< com.javacode2018:b2b-account-api >------------------ [INFO] Building b2b-account-api 1.0-SNAPSHOT [INFO] --------------------------------[ jar ]--------------------------------- [INFO] [INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ b2b-account-api --- [INFO] Deleting D:\code\IdeaProjects\b2b\b2b-account\b2b-account-api\target [INFO] [INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ b2b-account-api --- [WARNING] Using platform encoding (GBK actually) to copy filtered resources, i.e. build is platform dependent! [INFO] Copying 0 resource [INFO] [INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ b2b-account-api --- [INFO] Nothing to compile - all classes are up to date [INFO] [INFO] --- maven-resources-plugin:2.6:testResources (default-testResources) @ b2b-account-api --- [WARNING] Using platform encoding (GBK actually) to copy filtered resources, i.e. build is platform dependent! [INFO] skip non existing resourceDirectory D:\code\IdeaProjects\b2b\b2b-account\b2b-account-api\src\test\resources [INFO] [INFO] --- maven-compiler-plugin:3.1:testCompile (default-testCompile) @ b2b-account-api --- [INFO] Nothing to compile - all classes are up to date [INFO] [INFO] --- maven-surefire-plugin:2.12.4:test (default-test) @ b2b-account-api --- [INFO] No tests to run. [INFO] [INFO] --- maven-jar-plugin:2.4:jar (default-jar) @ b2b-account-api --- [INFO] Building jar: D:\code\IdeaProjects\b2b\b2b-account\b2b-account-api\target\b2b-account-api-1.0-SNAPSHOT.jar [INFO] [INFO] --- maven-install-plugin:2.4:install (default-install) @ b2b-account-api --- [INFO] Installing D:\code\IdeaProjects\b2b\b2b-account\b2b-account-api\target\b2b-account-api-1.0-SNAPSHOT.jar to C:\Users\Think\.m2\repository\com\javacode2018\b2b-account-api\1.0-SNAPSHOT\b2b-account-api-1.0-SNAPSHOT.jar [INFO] Installing D:\code\IdeaProjects\b2b\b2b-account\b2b-account-api\pom.xml to C:\Users\Think\.m2\repository\com\javacode2018\b2b-account-api\1.0-SNAPSHOT\b2b-account-api-1.0-SNAPSHOT.pom [INFO] ------------------------------------------------------------------------ [INFO] BUILD SUCCESS [INFO] ------------------------------------------------------------------------ [INFO] Total time: 2.853 s [INFO] Finished at: 2019-11-20T16:14:37+08:00 [INFO] ------------------------------------------------------------------------
上面使用的是相對路徑的寫法，還有2種寫法，你們能夠去試試，以下：
mvn clean install -pl :b2b-account-api mvn clean install -pl com.javacode2018:b2b-account-api
案例3
構建b2b-account-api和b2b-order-api，運行下面命令：
mvn clean install -pl b2b-account/b2b-account-api,b2b-order/b2b-order-api
效果以下：
D:\code\IdeaProjects\b2b>mvn clean install -pl b2b-account/b2b-account-api,b2b-order/b2b-order-api [INFO] Scanning for projects... [INFO] ------------------------------------------------------------------------ [INFO] Reactor Build Order: [INFO] [INFO] b2b-account-api [jar] [INFO] b2b-order-api [jar] [INFO] [INFO] ------------------< com.javacode2018:b2b-account-api >------------------ [INFO] Building b2b-account-api 1.0-SNAPSHOT [1/2] [INFO] --------------------------------[ jar ]--------------------------------- [INFO] [INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ b2b-account-api --- [INFO] Deleting D:\code\IdeaProjects\b2b\b2b-account\b2b-account-api\target [INFO] [INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ b2b-account-api --- [WARNING] Using platform encoding (GBK actually) to copy filtered resources, i.e. build is platform dependent! [INFO] Copying 0 resource [INFO] [INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ b2b-account-api --- [INFO] Nothing to compile - all classes are up to date [INFO] [INFO] --- maven-resources-plugin:2.6:testResources (default-testResources) @ b2b-account-api --- [WARNING] Using platform encoding (GBK actually) to copy filtered resources, i.e. build is platform dependent! [INFO] skip non existing resourceDirectory D:\code\IdeaProjects\b2b\b2b-account\b2b-account-api\src\test\resources [INFO] [INFO] --- maven-compiler-plugin:3.1:testCompile (default-testCompile) @ b2b-account-api --- [INFO] Nothing to compile - all classes are up to date [INFO] [INFO] --- maven-surefire-plugin:2.12.4:test (default-test) @ b2b-account-api --- [INFO] No tests to run. [INFO] [INFO] --- maven-jar-plugin:2.4:jar (default-jar) @ b2b-account-api --- [INFO] Building jar: D:\code\IdeaProjects\b2b\b2b-account\b2b-account-api\target\b2b-account-api-1.0-SNAPSHOT.jar [INFO] [INFO] --- maven-install-plugin:2.4:install (default-install) @ b2b-account-api --- [INFO] Installing D:\code\IdeaProjects\b2b\b2b-account\b2b-account-api\target\b2b-account-api-1.0-SNAPSHOT.jar to C:\Users\Think\.m2\repository\com\javacode2018\b2b-account-api\1.0-SNAPSHOT\b2b-account-api-1.0-SNAPSHOT.jar [INFO] Installing D:\code\IdeaProjects\b2b\b2b-account\b2b-account-api\pom.xml to C:\Users\Think\.m2\repository\com\javacode2018\b2b-account-api\1.0-SNAPSHOT\b2b-account-api-1.0-SNAPSHOT.pom [INFO] [INFO] -------------------< com.javacode2018:b2b-order-api >------------------- [INFO] Building b2b-order-api 1.0-SNAPSHOT [2/2] [INFO] --------------------------------[ jar ]--------------------------------- [INFO] [INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ b2b-order-api --- [INFO] Deleting D:\code\IdeaProjects\b2b\b2b-order\b2b-order-api\target [INFO] [INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ b2b-order-api --- [WARNING] Using platform encoding (GBK actually) to copy filtered resources, i.e. build is platform dependent! [INFO] Copying 0 resource [INFO] [INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ b2b-order-api --- [INFO] Nothing to compile - all classes are up to date [INFO] [INFO] --- maven-resources-plugin:2.6:testResources (default-testResources) @ b2b-order-api --- [WARNING] Using platform encoding (GBK actually) to copy filtered resources, i.e. build is platform dependent! [INFO] skip non existing resourceDirectory D:\code\IdeaProjects\b2b\b2b-order\b2b-order-api\src\test\resources [INFO] [INFO] --- maven-compiler-plugin:3.1:testCompile (default-testCompile) @ b2b-order-api --- [INFO] Nothing to compile - all classes are up to date [INFO] [INFO] --- maven-surefire-plugin:2.12.4:test (default-test) @ b2b-order-api --- [INFO] No tests to run. [INFO] [INFO] --- maven-jar-plugin:2.4:jar (default-jar) @ b2b-order-api --- [INFO] Building jar: D:\code\IdeaProjects\b2b\b2b-order\b2b-order-api\target\b2b-order-api-1.0-SNAPSHOT.jar [INFO] [INFO] --- maven-install-plugin:2.4:install (default-install) @ b2b-order-api --- [INFO] Installing D:\code\IdeaProjects\b2b\b2b-order\b2b-order-api\target\b2b-order-api-1.0-SNAPSHOT.jar to C:\Users\Think\.m2\repository\com\javacode2018\b2b-order-api\1.0-SNAPSHOT\b2b-order-api-1.0-SNAPSHOT.jar [INFO] Installing D:\code\IdeaProjects\b2b\b2b-order\b2b-order-api\pom.xml to C:\Users\Think\.m2\repository\com\javacode2018\b2b-order-api\1.0-SNAPSHOT\b2b-order-api-1.0-SNAPSHOT.pom [INFO] ------------------------------------------------------------------------ [INFO] Reactor Summary for b2b-account-api 1.0-SNAPSHOT: [INFO] [INFO] b2b-account-api .................................... SUCCESS [ 2.874 s] [INFO] b2b-order-api ...................................... SUCCESS [ 0.393 s] [INFO] ------------------------------------------------------------------------ [INFO] BUILD SUCCESS [INFO] ------------------------------------------------------------------------ [INFO] Total time: 3.554 s [INFO] Finished at: 2019-11-20T16:15:57+08:00 [INFO] ------------------------------------------------------------------------
上面輸出中能夠看到只構建了2個目標模塊。
案例4
咱們只修改了b2b-account-api代碼，因此我但願對這個從新打包，而且對這個有依賴的也從新打包，因此須要打包下面3個模塊：
b2b-account-api b2b-account-service b2b-order-service
上面列表中的後面兩個是依賴於b2b-account-api的，能夠在b2b/pom.xml中執行下面命令：
mvn clean install -pl b2b-account/b2b-account-api -amd
咱們看一下效果：
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] ------------------------------------------------------------------------
從上面輸出中看一下反應堆列出的構建順序：b2b-account-api、b2b-account-service、b2b-order-service。
上面過程給你們捋一捋：
上面命令先會運行-pl b2b-account-api獲得一個反應堆列表，以下，只有一個模塊：
b2b-account-api
而後後面又會執行amd，這個命令會找到對-pl b2b-account-api有依賴的構件，也就是：
b2b-account-service b2b-order-serivce
而後反應堆會對3個構件進行排序，獲得一個正確的構件順序，以下：
[INFO] Reactor Build Order: [INFO] [INFO] b2b-account-api [jar] [INFO] b2b-account-service [jar] [INFO] b2b-order-service [jar]
而後maven會依次對他們執行：
mvn clean install
案例5
需求：咱們來構建b2b-order-service，但願b2b-account-service依賴的構件也能被同時構建，b2b-account-service依賴於b2b-account-api和b2b-order-api，可能b2b-account-service會依賴的更多。
可使用下面命令：
mvn clean install -pl b2b-order/b2b-order-service -am
效果以下：
D:\code\IdeaProjects\b2b>mvn clean install -pl b2b-order/b2b-order-service -am [INFO] Scanning for projects... [INFO] ------------------------------------------------------------------------ [INFO] Reactor Build Order: [INFO] [INFO] b2b-account-api [jar] [INFO] b2b-order-api [jar] [INFO] b2b-order-service [jar] [INFO] [INFO] ------------------< com.javacode2018:b2b-account-api >------------------ [INFO] Building b2b-account-api 1.0-SNAPSHOT [1/3] [INFO] --------------------------------[ jar ]--------------------------------- [INFO] [INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ b2b-account-api --- [INFO] Deleting D:\code\IdeaProjects\b2b\b2b-account\b2b-account-api\target [INFO] [INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ b2b-account-api --- [WARNING] Using platform encoding (GBK actually) to copy filtered resources, i.e. build is platform dependent! [INFO] Copying 0 resource [INFO] [INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ b2b-account-api --- [INFO] Nothing to compile - all classes are up to date [INFO] [INFO] --- maven-resources-plugin:2.6:testResources (default-testResources) @ b2b-account-api --- [WARNING] Using platform encoding (GBK actually) to copy filtered resources, i.e. build is platform dependent! [INFO] skip non existing resourceDirectory D:\code\IdeaProjects\b2b\b2b-account\b2b-account-api\src\test\resources [INFO] [INFO] --- maven-compiler-plugin:3.1:testCompile (default-testCompile) @ b2b-account-api --- [INFO] Nothing to compile - all classes are up to date [INFO] [INFO] --- maven-surefire-plugin:2.12.4:test (default-test) @ b2b-account-api --- [INFO] No tests to run. [INFO] [INFO] --- maven-jar-plugin:2.4:jar (default-jar) @ b2b-account-api --- [INFO] Building jar: D:\code\IdeaProjects\b2b\b2b-account\b2b-account-api\target\b2b-account-api-1.0-SNAPSHOT.jar [INFO] [INFO] --- maven-install-plugin:2.4:install (default-install) @ b2b-account-api --- [INFO] Installing D:\code\IdeaProjects\b2b\b2b-account\b2b-account-api\target\b2b-account-api-1.0-SNAPSHOT.jar to C:\Users\Think\.m2\repository\com\javacode2018\b2b-account-api\1.0-SNAPSHOT\b2b-account-api-1.0-SNAPSHOT.jar [INFO] Installing D:\code\IdeaProjects\b2b\b2b-account\b2b-account-api\pom.xml to C:\Users\Think\.m2\repository\com\javacode2018\b2b-account-api\1.0-SNAPSHOT\b2b-account-api-1.0-SNAPSHOT.pom [INFO] [INFO] -------------------< com.javacode2018:b2b-order-api >------------------- [INFO] Building b2b-order-api 1.0-SNAPSHOT [2/3] [INFO] --------------------------------[ jar ]--------------------------------- [INFO] [INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ b2b-order-api --- [INFO] Deleting D:\code\IdeaProjects\b2b\b2b-order\b2b-order-api\target [INFO] [INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ b2b-order-api --- [WARNING] Using platform encoding (GBK actually) to copy filtered resources, i.e. build is platform dependent! [INFO] Copying 0 resource [INFO] [INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ b2b-order-api --- [INFO] Nothing to compile - all classes are up to date [INFO] [INFO] --- maven-resources-plugin:2.6:testResources (default-testResources) @ b2b-order-api --- [WARNING] Using platform encoding (GBK actually) to copy filtered resources, i.e. build is platform dependent! [INFO] skip non existing resourceDirectory D:\code\IdeaProjects\b2b\b2b-order\b2b-order-api\src\test\resources [INFO] [INFO] --- maven-compiler-plugin:3.1:testCompile (default-testCompile) @ b2b-order-api --- [INFO] Nothing to compile - all classes are up to date [INFO] [INFO] --- maven-surefire-plugin:2.12.4:test (default-test) @ b2b-order-api --- [INFO] No tests to run. [INFO] [INFO] --- maven-jar-plugin:2.4:jar (default-jar) @ b2b-order-api --- [INFO] Building jar: D:\code\IdeaProjects\b2b\b2b-order\b2b-order-api\target\b2b-order-api-1.0-SNAPSHOT.jar [INFO] [INFO] --- maven-install-plugin:2.4:install (default-install) @ b2b-order-api --- [INFO] Installing D:\code\IdeaProjects\b2b\b2b-order\b2b-order-api\target\b2b-order-api-1.0-SNAPSHOT.jar to C:\Users\Think\.m2\repository\com\javacode2018\b2b-order-api\1.0-SNAPSHOT\b2b-order-api-1.0-SNAPSHOT.jar [INFO] Installing D:\code\IdeaProjects\b2b\b2b-order\b2b-order-api\pom.xml to C:\Users\Think\.m2\repository\com\javacode2018\b2b-order-api\1.0-SNAPSHOT\b2b-order-api-1.0-SNAPSHOT.pom [INFO] [INFO] -----------------< com.javacode2018:b2b-order-service >----------------- [INFO] Building b2b-order-service 1.0-SNAPSHOT [3/3] [INFO] --------------------------------[ jar ]--------------------------------- [INFO] [INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ b2b-order-service --- [INFO] Deleting D:\code\IdeaProjects\b2b\b2b-order\b2b-order-service\target [INFO] [INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ b2b-order-service --- [WARNING] Using platform encoding (GBK actually) to copy filtered resources, i.e. build is platform dependent! [INFO] Copying 0 resource [INFO] [INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ b2b-order-service --- [INFO] Nothing to compile - all classes are up to date [INFO] [INFO] --- maven-resources-plugin:2.6:testResources (default-testResources) @ b2b-order-service --- [WARNING] Using platform encoding (GBK actually) to copy filtered resources, i.e. build is platform dependent! [INFO] skip non existing resourceDirectory D:\code\IdeaProjects\b2b\b2b-order\b2b-order-service\src\test\resources [INFO] [INFO] --- maven-compiler-plugin:3.1:testCompile (default-testCompile) @ b2b-order-service --- [INFO] Nothing to compile - all classes are up to date [INFO] [INFO] --- maven-surefire-plugin:2.12.4:test (default-test) @ b2b-order-service --- [INFO] No tests to run. [INFO] [INFO] --- maven-jar-plugin:2.4:jar (default-jar) @ b2b-order-service --- [INFO] Building jar: D:\code\IdeaProjects\b2b\b2b-order\b2b-order-service\target\b2b-order-service-1.0-SNAPSHOT.jar [INFO] [INFO] --- maven-install-plugin:2.4:install (default-install) @ b2b-order-service --- [INFO] Installing D:\code\IdeaProjects\b2b\b2b-order\b2b-order-service\target\b2b-order-service-1.0-SNAPSHOT.jar to C:\Users\Think\.m2\repository\com\javacode2018\b2b-order-service\1.0-SNAPSHOT\b2b-order-service-1.0-SNAPSHOT.jar [INFO] Installing D:\code\IdeaProjects\b2b\b2b-order\b2b-order-service\pom.xml to C:\Users\Think\.m2\repository\com\javacode2018\b2b-order-service\1.0-SNAPSHOT\b2b-order-service-1.0-SNAPSHOT.pom [INFO] ------------------------------------------------------------------------ [INFO] Reactor Summary for b2b-account-api 1.0-SNAPSHOT: [INFO] [INFO] b2b-account-api .................................... SUCCESS [ 2.509 s] [INFO] b2b-order-api ...................................... SUCCESS [ 0.343 s] [INFO] b2b-order-service .................................. SUCCESS [ 0.340 s] [INFO] ------------------------------------------------------------------------ [INFO] BUILD SUCCESS [INFO] ------------------------------------------------------------------------ [INFO] Total time: 3.455 s [INFO] Finished at: 2019-11-20T16:46:45+08:00 [INFO] ------------------------------------------------------------------------
從上面輸出中看一下反應堆列出的構建順序：b2b-account-api、b2b-order-api、b2b-order-service。
上面過程給你們捋一捋：
上面命令先會運行-pl b2b-order-service獲得一個反應堆列表：
b2b-order-service
而後後面又會執行am，這個命令會找到-pl b2b-order-service依賴的構件，也就是：
b2b-account-api b2b-order-api
而後反應堆會對3個構件進行排序，獲得一個正確的構件順序，以下：
[INFO] Reactor Build Order: [INFO] [INFO] b2b-account-api [jar] [INFO] b2b-order-api [jar] [INFO] b2b-order-service [jar]
而後maven會依次對他們執行：
mvn clean install
案例6
分別執行下面2條mvn命令，先看一下效果：
mvn clean install mvn clean install -rf b2b-order/b2b-order-service
輸出中咱們取出部份內容，以下。
第一條命令，反應堆產生的構建順序是：
[INFO] Reactor Build Order: [INFO] [INFO] b2b-account-api [jar] [INFO] b2b-account-service [jar] [INFO] b2b-account [pom] [INFO] b2b-order-api [jar] [INFO] b2b-order-service [jar] [INFO] b2b-order [pom] [INFO] b2b [pom]
第2條命令，反應堆產生的構建順序是：
[INFO] Reactor Build Order: [INFO] [INFO] b2b-order-service [jar] [INFO] b2b-order [pom] [INFO] b2b [pom]
在仔細看一下上面2條命令的差異，後面的命令多了-rf b2b-order/b2b-order-service，具體過程以下：
會先執行下面命令
mvn clean install
反應堆會計算出須要構件的模塊順序，以下：
[INFO] Reactor Build Order: [INFO] [INFO] b2b-account-api [jar] [INFO] b2b-account-service [jar] [INFO] b2b-account [pom] [INFO] b2b-order-api [jar] [INFO] b2b-order-service [jar] [INFO] b2b-order [pom] [INFO] b2b [pom]
-rf b2b-order/b2b-order-service對上面的反應堆構件順序進行裁剪，將b2b-order/b2b-order-service前面的部分幹掉，從b2b-order/b2b-order-service開始執行構建操做，因此剩下了3個須要構建的模塊。
總結
- 須要掌握
mvn命令中-pl、-am、-amd、-rf的各類用法 - 注意
-pl後面的參數的寫法：模塊相對路徑、或者[groupId].artifactId
仍是那句話，上面這些用法你們會常常用到的，建議你們下去了多練練。看和操做，所獲取到的是不能比的，看的過程當中可能以爲一切都知道了，可是實際操做就不同了，可能中間會遇到各類問題，而後本身會想辦法解決這些問題，領會和學到的東西是不同的！
Maven系列目錄
- Maven系列：第1篇：Maven未出世前，咱們那些痛苦的經歷！
- Maven系列第2篇：安裝、配置、mvn運行過程詳解
- Maven系列第3篇：詳解maven解決依賴問題
- Maven系列第4篇：倉庫詳解
- Maven系列第5篇：私服詳解
- Maven系列第6篇：生命週期和插件詳解，高手必備！
- Maven系列第7篇：聚合、繼承、單繼承問題詳解，必備技能！
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