Maven configuration file location and sample code

As a Java project management tool, Maven needs to use configuration files to specify various properties of the project during the project construction process. Information such as dependencies and build plugins. Among them, settings.xml is the main configuration file of Maven, which is usually used to configure images, warehouses, agents and other related information. So when using Maven, where should settings.xml be placed? Next, we will introduce the location of the Maven configuration file and give specific code examples.

Configuration file placement location

Maven's settings.xmlThere are two typical placement locations for configuration files:

Global Configuration file location: Normally, Maven's global configuration file is located in the conf folder under the Maven installation directory. The configuration modified here takes effect for all Maven projects.
User configuration file location: Maven also supports user-level configuration files, located in the user's $HOME/.m2 directory. The configuration modified here only takes effect for the current user's Maven project.

Configuration file example

settings.xml

The following is a simple settings.xmlconfiguration file example:

<settings>
  <mirrors>
    <mirror>
      <id>aliyun</id>
      <mirrorOf>central</mirrorOf>
      <url>https://maven.aliyun.com/repository/central</url>
    </mirror>
  </mirrors>

  <profiles>
    <profile>
      <id>development</id>
      <activation>
        <activeByDefault>true</activeByDefault>
      </activation>
      <properties>
        <env>dev</env>
      </properties>
    </profile>
    <profile>
      <id>production</id>
      <properties>
        <env>prod</env>
      </properties>
    </profile>
  </profiles>

  <activeProfiles>
    <activeProfile>development</activeProfile>
  </activeProfiles>
</settings>

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In the above example, a mirror is configured to point the central warehouse to the Alibaba Cloud mirror. Two configuration files (development and production) are defined at the same time, among which the development configuration is activated by default and is used for the development environment, while the productionConfiguration for production environment.

pom.xml

In addition, the pom.xml configuration file of the Maven project is also crucial. It is mainly used to specify the metadata information and dependencies of the project. , build plug-ins, etc. The following is an example of a simple pom.xml file:

<project>
  <modelVersion>4.0.0</modelVersion>
  <groupId>com.example</groupId>
  <artifactId>my-project</artifactId>
  <version>1.0.0</version>

  <dependencies>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-core</artifactId>
      <version>5.2.6.RELEASE</version>
    </dependency>
  </dependencies>

  <build>
    <plugins>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-compiler-plugin</artifactId>
        <version>3.8.1</version>
        <configuration>
            <source>1.8</source>
            <target>1.8</target>
        </configuration>
      </plugin>
    </plugins>
  </build>
</project>

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In this example, a simple Maven project is defined that contains a dependency (spring of the Spring framework -core module) and a build plugin (compile plugin).

Through the above examples, readers should be able to understand where the Maven configuration file is placed and how to configure the settings.xml and pom.xml files. For the construction and management of Maven projects, it is very important to properly configure these files. Hope the above content is helpful to readers!

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