Maven自动化构建

天蓝色 发表于 2023年10月21日 11:17  145次阅读  举报

Maven 自动化构建是一种方案，即当某个项目构建完成后（特别是有代码更新的情况下），所有依赖它的相关项目也应该开始构建过程，以确保这些项目的稳定运行。

Maven 的自动化构建主要通过如下两种方案实现：

  • 使用 maven-invoker-plugin 插件。
  • 使用持续集成（CI）服务器自动管理构建自动化，例如 Jenkins （了解即可）。

使用 maven-invoker-plugin 插件

Maven 社区提供了一个名为 maven-invoker-plugin 的插件，该插件能够用来在一组项目上执行构建工作，并检查每个项目是否构建成功，通过它就可以实现 Maven 的自动化构建。

如下图所示，在 D:\maven 目录下有 3 个 Maven 项目。

Maven 构建自动化图1

其中，helloMaven 项目的 pom.xml 配置如下。

  1. <project xmlns="http://maven.apache.org/POM/4.0.0"
  2.          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  3.          xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
  4.     <modelVersion>4.0.0</modelVersion>
  5.     <groupId>net.jhelp.www</groupId>
  6.     <artifactId>helloMaven</artifactId>
  7.     <packaging>jar</packaging>
  8.     <version>1.0-SNAPSHOT</version>
  9.     <name>helloMaven</name>
  10.     <url>http://maven.apache.org</url>
  11.     <dependencies>
  12.         <dependency>
  13.             <groupId>junit</groupId>
  14.             <artifactId>junit</artifactId>
  15.             <version>3.8.1</version>
  16.             <scope>test</scope>
  17.         </dependency>
  18.     </dependencies>
  19.     <build>
  20.         <plugins>
  21.             <!-- 添加invoker 插件 -->
  22.             <plugin>
  23.                 <groupId>org.apache.maven.plugins</groupId>
  24.                 <artifactId>maven-invoker-plugin</artifactId>
  25.                 <version>3.2.2</version>
  26.                 <configuration>
  27.                     <debug>true</debug>
  28.                     <!--设置 invkoer插件 添加的 pom 文件所在的文件夹  -->
  29.                     <projectsDirectory>D:\maven</projectsDirectory>
  30.                     <!-- 设置 invkoer插件 添加的 pom 文件 -->
  31.                     <pomIncludes>
  32.                         <pomInclude>secondMaven\pom.xml</pomInclude>
  33.                         <pomInclude>thirdMaven\pom.xml</pomInclude>
  34.                     </pomIncludes>
  35.                 </configuration>
  36.                 <executions>
  37.                     <execution>
  38.                         <id>id-integration-test</id>
  39.                         <!-- 执行的目标 -->
  40.                         <goals>
  41.                             <goal>run</goal>
  42.                         </goals>
  43.                     </execution>
  44.                 </executions>
  45.             </plugin>
  46.         </plugins>
  47.     </build>
  48. </project>

以上配置中，在 build 的 plugins 子元素中使用了一个 plugin 元素声明了一个构建期的插件 maven-invoker-plugin，该插件配置中各元素含义如下：

  • groupId：插件的项目组 id;
  • artifactId：插件的项目或模块 id；
  • version：插件的版本；
  • projectsDirectory：需要构建项目的目录，该元素可单独使用，表示该目录下的所有 Maven 项目都会在当前项目构建完成后开始构建；
  • pomIncludes：该元素内可以声明一个或多个 pomInclude 元素，需与 projectDirectory 元素配合使用，共同指定需要构建项目的 pom.xml。

secondMaven 项目依赖于 helloMaven ，其 pom.xml 配置如下。

  1. <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  2.          xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
  3.     <modelVersion>4.0.0</modelVersion>
  4.     <groupId>net.jhelp.www</groupId>
  5.     <artifactId>secondMaven</artifactId>
  6.     <packaging>jar</packaging>
  7.     <version>1.0-SNAPSHOT</version>
  8.     <name>secondMaven</name>
  9.     <url>http://maven.apache.org</url>
  10.     <build>
  11.         <plugins>
  12.             <plugin>
  13.                 <groupId>org.apache.maven.plugins</groupId>
  14.                 <artifactId>maven-site-plugin</artifactId>
  15.                 <version>3.7.1</version>
  16.             </plugin>
  17.             <plugin>
  18.                 <groupId>org.apache.maven.plugins</groupId>
  19.                 <artifactId>maven-project-info-reports-plugin</artifactId>
  20.                 <version>3.0.0</version>
  21.             </plugin>
  22.         </plugins>
  23.     </build>
  24.     <dependencies>
  25.         <dependency>
  26.             <groupId>junit</groupId>
  27.             <artifactId>junit</artifactId>
  28.             <version>3.8.1</version>
  29.             <scope>test</scope>
  30.         </dependency>
  31.         <dependency>
  32.             <groupId>net.jhelp.www</groupId>
  33.             <artifactId>helloMaven</artifactId>
  34.             <scope>system</scope>
  35.             <version>1.0-SNAPSHOT</version>
  36.             <systemPath>D:\maven\helloMaven\target\helloMaven-1.0-SNAPSHOT.jar</systemPath>
  37.         </dependency>
  38.     </dependencies>
  39. </project>

thirdMaven 项目依赖于 helloMaven ，其 pom.xml 配置如下。

  1. <?xml version="1.0" encoding="UTF-8"?>
  2. <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  3.          xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  4.     <modelVersion>4.0.0</modelVersion>
  5.     <groupId>net.jhelp.www</groupId>
  6.     <artifactId>thirdMaven</artifactId>
  7.     <version>1.0-SNAPSHOT</version>
  8.     <name>thirdMaven</name>
  9.     <!-- FIXME change it to the project's website -->
  10.     <url>http://www.example.com</url>
  11.     <properties>
  12.         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
  13.         <maven.compiler.source>1.7</maven.compiler.source>
  14.         <maven.compiler.target>1.7</maven.compiler.target>
  15.     </properties>
  16.     <dependencies>
  17.         <dependency>
  18.             <groupId>junit</groupId>
  19.             <artifactId>junit</artifactId>
  20.             <version>4.11</version>
  21.             <scope>test</scope>
  22.         </dependency>
  23.         <dependency>
  24.             <groupId>net.jhelp.www</groupId>
  25.             <artifactId>helloMaven</artifactId>
  26.             <version>1.0-SNAPSHOT</version>
  27.         </dependency>
  28.     </dependencies>
  29.     <build>
  30.         <pluginManagement>
  31.             <plugins>
  32.                 <plugin>
  33.                     <artifactId>maven-clean-plugin</artifactId>
  34.                     <version>3.1.0</version>
  35.                 </plugin>
  36.                 <plugin>
  37.                     <artifactId>maven-resources-plugin</artifactId>
  38.                     <version>3.0.2</version>
  39.                 </plugin>
  40.                 <plugin>
  41.                     <artifactId>maven-compiler-plugin</artifactId>
  42.                     <version>3.8.0</version>
  43.                 </plugin>
  44.                 <plugin>
  45.                     <artifactId>maven-surefire-plugin</artifactId>
  46.                     <version>2.22.1</version>
  47.                 </plugin>
  48.                 <plugin>
  49.                     <artifactId>maven-jar-plugin</artifactId>
  50.                     <version>3.0.2</version>
  51.                 </plugin>
  52.                 <plugin>
  53.                     <artifactId>maven-install-plugin</artifactId>
  54.                     <version>2.5.2</version>
  55.                 </plugin>
  56.                 <plugin>
  57.                     <artifactId>maven-deploy-plugin</artifactId>
  58.                     <version>2.8.2</version>
  59.                 </plugin>
  60.                 <plugin>
  61.                     <artifactId>maven-site-plugin</artifactId>
  62.                     <version>3.7.1</version>
  63.                 </plugin>
  64.                 <plugin>
  65.                     <artifactId>maven-project-info-reports-plugin</artifactId>
  66.                     <version>3.0.0</version>
  67.                 </plugin>
  68.             </plugins>
  69.         </pluginManagement>
  70.     </build>
  71. </project>

打开命令控制台，执行如下命令，查看 maven-invoker-plugin 插件绑定的目标。

  1. >mvn help:describe -Dplugin=invoker

Maven 命令执行结果如下。

  • [INFO] Scanning for projects...
  • [INFO]
  • [INFO] ------------------< org.apache.maven:standalone-pom >-------------------
  • [INFO] Building Maven Stub Project (No POM) 1
  • [INFO] --------------------------------[ pom ]---------------------------------
  • [INFO]
  • [INFO] --- maven-help-plugin:3.2.0:describe (default-cli) @ standalone-pom ---
  • Downloading from central: https://repo.maven.apache.org/maven2/org/apache/maven/plugins/maven-invoker-plugin/maven-metadata.xml
  • Downloaded from central: https://repo.maven.apache.org/maven2/org/apache/maven/plugins/maven-invoker-plugin/maven-metadata.xml (888 B at 539 B/s)
  • [INFO] org.apache.maven.plugins:maven-invoker-plugin:3.2.2
  • Name: Apache Maven Invoker Plugin
  • Description: The Maven Invoker Plugin is used to run a set of Maven projects.
  •   The plugin can determine whether each project execution is successful, and
  •   optionally can verify the output generated from a given project execution.
  • Group Id: org.apache.maven.plugins
  • Artifact Id: maven-invoker-plugin
  • Version: 3.2.2
  • Goal Prefix: invoker
  • This plugin has 6 goals:
  • invoker:help
  •   Description: Display help information on maven-invoker-plugin.
  •     Call mvn invoker:help -Ddetail=true -Dgoal=<goal-name> to display parameter
  •     details.
  • invoker:install
  •   Description: Installs the project artifacts of the main build into the
  •     local repository as a preparation to run the sub projects. More precisely,
  •     all artifacts of the project itself, all its locally reachable parent POMs
  •     and all its dependencies from the reactor will be installed to the local
  •     repository.
  • invoker:integration-test
  •   Description: Searches for integration test Maven projects, and executes
  •     each, collecting a log in the project directory, will never fail the build,
  •     designed to be used in conjunction with the verify mojo.
  • invoker:report
  •   Description: Generate a report based on the results of the Maven
  •     invocations. Note: This mojo doesn't fork any lifecycle, if you have a
  •     clean working copy, you have to use a command like mvn clean
  •     integration-test site to ensure the build results are present when this
  •     goal is invoked.
  •   Note: This goal should be used as a Maven report.
  • invoker:run
  •   Description: Searches for integration test Maven projects, and executes
  •     each, collecting a log in the project directory, and outputting the results
  •     to the command line.
  • invoker:verify
  •   Description: Checks the results of maven-invoker-plugin based integration
  •     tests and fails the build if any tests failed.
  • For more information, run 'mvn help:describe [...] -Ddetail'
  • [INFO] ------------------------------------------------------------------------
  • [INFO] BUILD SUCCESS
  • [INFO] ------------------------------------------------------------------------
  • [INFO] Total time:  4.467 s
  • [INFO] Finished at: 2021-03-05T10:03:15+08:00
  • [INFO] ------------------------------------------------------------------------

由以上执行结果可知，maven-invoker-plugin 插件绑定的 Maven 生命周期阶段为 integration-test 及其以后，所以执行 integration-test 阶段及其以后的都可以触发该插件。

跳转到 D:\maven\helloMaven 目录下，执行如下 Maven 命令。

  • mvn clean install

执行结果如下。

  • [INFO] Scanning for projects...
  • [INFO]
  • [INFO] --------------------< net.jhelp.www:helloMaven >--------------------
  • [INFO] Building helloMaven 1.0-SNAPSHOT
  • [INFO] --------------------------------[ jar ]---------------------------------
  • [INFO]
  • [INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ helloMaven ---
  • [INFO] Deleting d:\maven\helloMaven\target
  • [INFO]
  • [INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ helloMaven ---
  • [WARNING] Using platform encoding (GBK actually) to copy filtered resources, i.e. build is platform dependent!
  • [INFO] skip non existing resourceDirectory d:\maven\helloMaven\src\main\resources
  • [INFO]
  • [INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ helloMaven ---
  • [INFO] Changes detected - recompiling the module!
  • [WARNING] File encoding has not been set, using platform encoding GBK, i.e. build is platform dependent!
  • [INFO] Compiling 2 source files to d:\maven\helloMaven\target\classes
  • [INFO]
  • [INFO] --- maven-resources-plugin:2.6:testResources (default-testResources) @ helloMaven ---
  • [WARNING] Using platform encoding (GBK actually) to copy filtered resources, i.e. build is platform dependent!
  • [INFO] skip non existing resourceDirectory d:\maven\helloMaven\src\test\resources
  • [INFO]
  • [INFO] --- maven-compiler-plugin:3.1:testCompile (default-testCompile) @ helloMaven ---
  • [INFO] Changes detected - recompiling the module!
  • [WARNING] File encoding has not been set, using platform encoding GBK, i.e. build is platform dependent!
  • [INFO] Compiling 1 source file to d:\maven\helloMaven\target\test-classes
  • [INFO]
  • [INFO] --- maven-surefire-plugin:2.12.4:test (default-test) @ helloMaven ---
  • [INFO] Surefire report directory: d:\maven\helloMaven\target\surefire-reports
  • -------------------------------------------------------
  • T E S T S
  • -------------------------------------------------------
  • Running net.jhelp.www.AppTest
  • Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.008 sec
  • Results :
  • Tests run: 1, Failures: 0, Errors: 0, Skipped: 0
  • [INFO]
  • [INFO] --- maven-jar-plugin:2.4:jar (default-jar) @ helloMaven ---
  • [INFO] Building jar: d:\maven\helloMaven\target\helloMaven-1.0-SNAPSHOT.jar
  • [INFO]
  • [INFO] --- maven-invoker-plugin:3.2.2:run (id-integration-test) @ helloMaven ---
  • [WARNING] File encoding has not been set, using platform encoding GBK, i.e. build is platform dependent!
  • [WARNING] Filtering of parent/child POMs is not supported without cloning the projects
  • [INFO] Building: secondMaven\pom.xml
  • [INFO]           secondMaven\pom.xml .............................. SUCCESS (2.6 s)
  • [INFO] Building: thirdMaven\pom.xml
  • [INFO]           thirdMaven\pom.xml ............................... SUCCESS (3.7 s)
  • [INFO] -------------------------------------------------
  • [INFO] Build Summary:
  • [INFO]   Passed: 2, Failed: 0, Errors: 0, Skipped: 0
  • [INFO] -------------------------------------------------
  • [INFO]
  • [INFO] --- maven-install-plugin:2.4:install (default-install) @ helloMaven ---
  • [INFO] Installing d:\maven\helloMaven\target\helloMaven-1.0-SNAPSHOT.jar to D:\myRepository\repository\net\jhelp\www\helloMaven\1.0-SNAPSHOT\helloMaven-1.0-SNAPSHOT.jar
  • [INFO] Installing d:\maven\helloMaven\pom.xml to D:\myRepository\repository\net\jhelp\www\helloMaven\1.0-SNAPSHOT\helloMaven-1.0-SNAPSHOT.pom
  • [INFO] ------------------------------------------------------------------------
  • [INFO] BUILD SUCCESS
  • [INFO] ------------------------------------------------------------------------
  • [INFO] Total time:  9.335 s
  • [INFO] Finished at: 2021-03-05T10:20:26+08:00
  • [INFO] ------------------------------------------------------------------------

通过以上执行过程可以看到，在 helloMaven 构建完成后， Invoker 插件对 secondMaven 和 thirdMaven 也进行了构建。

注意：secondMaven 和 thirdMaven 是否依赖于 helloMaven，不会影响 Invoker 插件是否对它们进行构建。即使 secondMaven 和 thirdMaven 都不依赖于 helloMaven，只要在 Invoker 插件中配置了这些项目，Invoker 插件也依然会在 helloMaven 构建完成后，对它们进行构建。

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