将类变量调用到build.properties中

public class Config {
    public static final String APP_VERSION = "1.0.0";
}

<project>
  ...
  <build>
    <plugins>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-resources-plugin</artifactId>
        <version>3.2.0</version>
        <executions>
          <execution>
            <id>copy-resources</id>
            <phase>validate</phase>
            <goals>
              <goal>copy-resources</goal>
            </goals>
            <configuration>
              <outputDirectory>${basedir}/target/classes</outputDirectory>
              <resources>
                <resource>
                  <directory>${basedir}</directory>
                  <filtering>true</filtering>
                  <includes>
                    <include>build.properties</include>
                  </includes>
                </resource>
              </resources>
            </configuration>
          </execution>
        </executions>
      </plugin>
    </plugins>
  </build>
</project>

app.version=${Config.APP_VERSION}

processResources {
    filesMatching('build.properties') {
        expand(project.properties)
    }
}

app.version=${Config.APP_VERSION}