maven properties dynamic conversion

The attributes of different profiles can be directly configured in the top-level pom.xml, which has the advantage that each module can share the configured attributes.

The first step is to create a new Spring Boot project, modify pom.xml, and add the <profiles/> configuration as follows:

<profiles>
    <profile>
        <id>dev</id>
        <properties>
            <username>zhangsan</username>
        </properties>
        <activation>
            <activeByDefault>true</activeByDefault>
        </activation>
    </profile>
    <profile>
        <id>prod</id>
        <properties>
            <username>lisi</username>
        </properties>
        <activation>
            <activeByDefault>true</activeByDefault>
        </activation>
    </profile>
</profiles>

 

Two profiles, dev and prod, are defined here, of which dev is activated by default. Properties are set in each profile via <properties/>.

The second step is to modify the compilation settings. Here < filtering >true</ filtering > specifies to use the properties under profile in pom.xml to replace the property references in ${xxx} under src/main/resources/:

<build>
    <resources>
        <resource>
            <directory>src/main/resources</directory>
            <filtering>true</filtering>
        </resource>
        <resource>
            <directory>src/main/java</directory>
            <includes>
                <include>**/*.xml</include>
            </includes>
        </resource>
    </resources>
    <plugins>
        <plugin>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-maven-plugin</artifactId>
        </plugin>
    </plugins>
</build>

The third step is to create a new src/main/resources/application.properties in a module, the content is:

username=${username}

 

The fourth step is to use the -P parameter to specify the profile in the compilation command, such as: mvn clean install -DskipTests -Pdev, to complete the compilation of the specified profile environment.

Look at the target/classes/application.properties file in the module, and find that when -Pdev is used, username=zhangsan in the file, and when -Pprod is used, username=lisi in the file