maven相关知识点

超、凢脫俗 2022-12-04 03:25 206阅读 0赞

phase ： 对应的执行阶段

goal ： 对应要执行的命令

configuration ： 执行命令所需的相关配置

示例1：在执行test阶段时执行主函数

<project>
      ...
      <build>
        <plugins>
          <plugin>
            <groupId>org.codehaus.mojo</groupId>
            <artifactId>exec-maven-plugin</artifactId>
            <version>1.6.0</version>
            <executions>
              <execution>
                // 可以添加对应的执行阶段
                <phase>test</phase>
                ...
                <goals>
                    // 指定来的 goal为java，表示运行java程序
                  <goal>java</goal>
                </goals>
              </execution>
            </executions>
            <configuration>
                // 指定了运行的main class
              <mainClass>com.example.Main</mainClass>
              // 执行运行 main class的参数
              // 其实就是传入main方法的String[]
              <arguments>
                <argument>argument1</argument>
                ...
              </arguments>
              // 运行java的程序的系统参数
              <systemProperties>
                <systemProperty>
                  <key>myproperty</key>
                  <value>myvalue</value>
                </systemProperty>
                ...
              </systemProperties>
            </configuration>
          </plugin>
        </plugins>
      </build>
       ...
    </project>

示例2：在构建项目时将deploy中的配置替换到打出的war包中的配置

<profiles>
            <profile>
                <id>auto</id>
                <activation>
                    <property>
                        <name>site</name>
                        <value>auto</value>
                    </property>
                </activation>
                <build>
                    
                    <plugins>
                        <plugin>
                            <groupId>org.apache.maven.plugins</groupId>
                            <artifactId>maven-resources-plugin</artifactId>
                            <version>2.5</version>
                            <executions>
                                <execution>
                                    <id>copy-site(auto)-resources</id>
                                    <phase>process-resources</phase>
                                    <goals>
                                        <goal>copy-resources</goal>
                                    </goals>
                                    <configuration>
                                        <overwrite>true</overwrite>
                                        <outputDirectory>${project.build.directory}/classes</outputDirectory>
                                        <resources>
                                            <resource>
                                                <directory>${project.basedir}/src/deploy/auto</directory>
                                                <filtering>false</filtering>
                                                <includes>
                                                    <include>**/*</include>
                                                </includes>
                                            </resource>
                                        </resources>
                                    </configuration>
                                </execution>
                            </executions>
                        </plugin>
    
                    </plugins>
                </build>
            </profile>
    
        </profiles>

[maven optional可选依赖][maven optional]

应用场景：projectA 依赖projectB,  projectB 依赖projectC时

<dependency>
      <groupId>com.itear.projectC</groupId>
      <artifactId>projectC</artifactId>
      <version>0.0.1-SNAPSHOT</version>
      <optional>true</optional>
    </dependency>

当projectB的<optional>true</optional>时, projectA中如果没有显式的引入projectC, 则projectA不依赖projectC, 即projectA可以自己选择是否依赖projectC

默认<optional>的值为false, 及子项目必须依赖

[maven optional]: https://www.cnblogs.com/chenweichu/p/6349478.html