前言

Apache Maven 3.5.0
OS: Windows 7, v.6.1, x86_64 / win32
org.apache.maven.plugins:maven-help-plugin:3.2.0
http://maven.apache.org/plugins/maven-help-plugin/index.html

Goals Overview

The Help Plugin has 7 goals:

help:active-profiles lists the profiles which are currently active for the build.

help:all-profiles lists the available profiles under the current project.

help:describe describes the attributes of a Plugin and/or a Mojo (Maven plain Old Java Object).

help:effective-pom displays the effective POM as an XML for the current build, with the active profiles factored in. If verbose, a
comment is added to each XML element describing the origin of the
line.

help:effective-settings displays the calculated settings as an XML for the project, given any profile enhancement and the inheritance of
the global settings into the user-level settings.

help:evaluate evaluates Maven expressions given by the user in an interactive mode.

help:system displays a list of the platform details like system properties and environment variables.

help:effective-pom

cmd> mvn help:effective-pom
[INFO] Scanning for projects...
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building module1 1.0
[INFO] ------------------------------------------------------------------------
[INFO]
[INFO] --- maven-help-plugin:3.2.0:effective-pom (default-cli) @ module1 ---
[INFO]
Effective POMs, after inheritance, interpolation, and profiles are applied:

<?xml version="1.0" encoding="GBK"?>
<!-- ====================================================================== -->
<!--                                                                        -->
<!-- Generated by Maven Help Plugin on 2019-12-05T13:55:15+08:00            -->
<!-- See: http://maven.apache.org/plugins/maven-help-plugin/                -->
<!--                                                                        -->
<!-- ====================================================================== -->
<!-- ====================================================================== -->
<!--                                                                        -->
<!-- Effective POM for project 'demo:module1:jar:1.0'                       -->
<!--                                                                        -->
<!-- ====================================================================== -->
<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 h
ttp://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <parent>
    <groupId>demo</groupId>
    <artifactId>demo</artifactId>
    <version>1.0</version>
  </parent>
  <groupId>demo</groupId>
  <artifactId>module1</artifactId>
  <version>1.0</version>
  <properties>
    <revision>1.0</revision>
  </properties>
  <repositories>
    <repository>
      <snapshots>
        <enabled>false</enabled>
      </snapshots>
      <id>central</id>
      <name>Central Repository</name>
      <url>https://repo.maven.apache.org/maven2</url>
    </repository>
  </repositories>
  <pluginRepositories>
    <pluginRepository>
      <releases>
        <updatePolicy>never</updatePolicy>
      </releases>
      <snapshots>
        <enabled>false</enabled>
      </snapshots>
      <id>central</id>
      <name>Central Repository</name>
      <url>https://repo.maven.apache.org/maven2</url>
    </pluginRepository>
  </pluginRepositories>
  <build>
    <sourceDirectory>D:\sde\eclipse_workspace\demo\module1\src\main\java</source
Directory>
    <scriptSourceDirectory>D:\sde\eclipse_workspace\demo\module1\src\main\script
s</scriptSourceDirectory>
    <testSourceDirectory>D:\sde\eclipse_workspace\demo\module1\src\test\java</te
stSourceDirectory>
    <outputDirectory>D:\sde\eclipse_workspace\demo\module1\target\classes</outpu
tDirectory>
    <testOutputDirectory>D:\sde\eclipse_workspace\demo\module1\target\test-class
es</testOutputDirectory>
    <resources>
      <resource>
        <directory>D:\sde\eclipse_workspace\demo\module1\src\main\resources</dir
ectory>
      </resource>
    </resources>
    <testResources>
      <testResource>
        <directory>D:\sde\eclipse_workspace\demo\module1\src\test\resources</dir
ectory>
      </testResource>
    </testResources>
    <directory>D:\sde\eclipse_workspace\demo\module1\target</directory>
    <finalName>module1-1.0</finalName>
    <pluginManagement>
      <plugins>
        <plugin>
          <artifactId>maven-antrun-plugin</artifactId>
          <version>1.3</version>
        </plugin>
        <plugin>
          <artifactId>maven-assembly-plugin</artifactId>
          <version>2.2-beta-5</version>
        </plugin>
        <plugin>
          <artifactId>maven-dependency-plugin</artifactId>
          <version>2.8</version>
        </plugin>
        <plugin>
          <artifactId>maven-release-plugin</artifactId>
          <version>2.3.2</version>
        </plugin>
      </plugins>
    </pluginManagement>
    <plugins>
      <plugin>
        <artifactId>maven-clean-plugin</artifactId>
        <version>2.5</version>
        <executions>
          <execution>
            <id>default-clean</id>
            <phase>clean</phase>
            <goals>
              <goal>clean</goal>
            </goals>
          </execution>
        </executions>
      </plugin>
      <plugin>
        <artifactId>maven-resources-plugin</artifactId>
        <version>2.6</version>
        <executions>
          <execution>
            <id>default-testResources</id>
            <phase>process-test-resources</phase>
            <goals>
              <goal>testResources</goal>
            </goals>
          </execution>
          <execution>
            <id>default-resources</id>
            <phase>process-resources</phase>
            <goals>
              <goal>resources</goal>
            </goals>
          </execution>
        </executions>
      </plugin>
      <plugin>
        <artifactId>maven-jar-plugin</artifactId>
        <version>2.4</version>
        <executions>
          <execution>
            <id>default-jar</id>
            <phase>package</phase>
            <goals>
              <goal>jar</goal>
            </goals>
          </execution>
        </executions>
      </plugin>
      <plugin>
        <artifactId>maven-compiler-plugin</artifactId>
        <version>3.1</version>
        <executions>
          <execution>
            <id>default-compile</id>
            <phase>compile</phase>
            <goals>
              <goal>compile</goal>
            </goals>
          </execution>
          <execution>
            <id>default-testCompile</id>
            <phase>test-compile</phase>
            <goals>
              <goal>testCompile</goal>
            </goals>
          </execution>
        </executions>
      </plugin>
      <plugin>
        <artifactId>maven-surefire-plugin</artifactId>
        <version>2.12.4</version>
        <executions>
          <execution>
            <id>default-test</id>
            <phase>test</phase>
            <goals>
              <goal>test</goal>
            </goals>
          </execution>
        </executions>
      </plugin>
      <plugin>
        <artifactId>maven-install-plugin</artifactId>
        <version>2.4</version>
        <executions>
          <execution>
            <id>default-install</id>
            <phase>install</phase>
            <goals>
              <goal>install</goal>
            </goals>
          </execution>
        </executions>
      </plugin>
      <plugin>
        <artifactId>maven-deploy-plugin</artifactId>
        <version>2.7</version>
        <executions>
          <execution>
            <id>default-deploy</id>
            <phase>deploy</phase>
            <goals>
              <goal>deploy</goal>
            </goals>
          </execution>
        </executions>
      </plugin>
      <plugin>
        <artifactId>maven-site-plugin</artifactId>
        <version>3.3</version>
        <executions>
          <execution>
            <id>default-site</id>
            <phase>site</phase>
            <goals>
              <goal>site</goal>
            </goals>
            <configuration>
              <outputDirectory>D:\sde\eclipse_workspace\demo\module1\target\site
</outputDirectory>
              <reportPlugins>
                <reportPlugin>
                  <groupId>org.apache.maven.plugins</groupId>
                  <artifactId>maven-project-info-reports-plugin</artifactId>
                </reportPlugin>
              </reportPlugins>
            </configuration>
          </execution>
          <execution>
            <id>default-deploy</id>
            <phase>site-deploy</phase>
            <goals>
              <goal>deploy</goal>
            </goals>
            <configuration>
              <outputDirectory>D:\sde\eclipse_workspace\demo\module1\target\site
</outputDirectory>
              <reportPlugins>
                <reportPlugin>
                  <groupId>org.apache.maven.plugins</groupId>
                  <artifactId>maven-project-info-reports-plugin</artifactId>
                </reportPlugin>
              </reportPlugins>
            </configuration>
          </execution>
        </executions>
        <configuration>
          <outputDirectory>D:\sde\eclipse_workspace\demo\module1\target\site</ou
tputDirectory>
          <reportPlugins>
            <reportPlugin>
              <groupId>org.apache.maven.plugins</groupId>
              <artifactId>maven-project-info-reports-plugin</artifactId>
            </reportPlugin>
          </reportPlugins>
        </configuration>
      </plugin>
    </plugins>
  </build>
  <reporting>
    <outputDirectory>D:\sde\eclipse_workspace\demo\module1\target\site</outputDi
rectory>
  </reporting>
</project>


[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 2.002 s
[INFO] Finished at: 2019-12-05T13:55:15+08:00
[INFO] Final Memory: 14M/155M
[INFO] ------------------------------------------------------------------------

help:effective-settings

cmd> mvn help:effective-settings
[INFO] Scanning for projects...
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building module1 1.0
[INFO] ------------------------------------------------------------------------
[INFO]
[INFO] --- maven-help-plugin:3.2.0:effective-settings (default-cli) @ module1 --
-
[INFO]
Effective user-specific configuration settings:

<?xml version="1.0" encoding="GBK"?>
<!-- ====================================================================== -->
<!--                                                                        -->
<!-- Generated by Maven Help Plugin on 2019-12-05T13:56:19+08:00            -->
<!-- See: http://maven.apache.org/plugins/maven-help-plugin/                -->
<!--                                                                        -->
<!-- ====================================================================== -->
<!-- ====================================================================== -->
<!--                                                                        -->
<!-- Effective Settings for 'Administrator' on 'SKY-20181119ZPD'            -->
<!--                                                                        -->
<!-- ====================================================================== -->
<settings xmlns="http://maven.apache.org/SETTINGS/1.1.0" xmlns:xsi="http://www.w
3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/SETTI
NGS/1.1.0 http://maven.apache.org/xsd/settings-1.1.0.xsd">
  <localRepository>D:\sde\maven_repo</localRepository>
  <mirrors>
    <mirror>
      <mirrorOf>central</mirrorOf>
      <name>aliyun maven</name>
      <url>http://maven.aliyun.com/nexus/content/groups/public/</url>
      <id>alimaven</id>
    </mirror>
  </mirrors>
  <pluginGroups>
    <pluginGroup>org.apache.maven.plugins</pluginGroup>
    <pluginGroup>org.codehaus.mojo</pluginGroup>
  </pluginGroups>
</settings>


[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 1.805 s
[INFO] Finished at: 2019-12-05T13:56:19+08:00
[INFO] Final Memory: 13M/155M
[INFO] ------------------------------------------------------------------------

help:evaluate

打印变量

cmd> mvn help:evaluate -Dexpression=project.version -q -DforceStdout
1.0

打印自定义变量

pom.xml

<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>demo</groupId>
  <artifactId>demo</artifactId>
  <version>${revision}</version>
  <packaging>pom</packaging>
  <properties>
  	<revision>1.0</revision>
  </properties>
  <modules>
  	<module>module1</module>
  </modules>
</project>

打印变量revision：

cmd> mvn help:evaluate -Dexpression=revision -q -DforceStdout
1.0

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【maven插件】maven-help-plugin

前言

Goals Overview

help:effective-pom

help:effective-settings

help:evaluate

打印变量

打印自定义变量

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