编译期使用MAVEN

To reference a property defined in an external file, all you need to do is add a reference to this external file in your pom.xml. First, let's create our external properties file and call it src/main/filters/filter.properties:

# filter.properties
my.filter.value=hello!

Next, we'll add a reference to this new file in the 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>com.mycompany.app</groupId>
  <artifactId>my-app</artifactId>
  <packaging>jar</packaging>
  <version>1.0-SNAPSHOT</version>
  <name>Maven Quick Start Archetype</name>
  <url>http://maven.apache.org</url>
  <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>3.8.1</version>
      <scope>test</scope>
    </dependency>
  </dependencies>
  <build>
    <filters>
      <filter>src/main/filters/filter.properties</filter>
    </filters>
    <resources>
      <resource>
        <directory>src/main/resources</directory>
        <filtering>true</filtering>
      </resource>
    </resources>
  </build>
</project>

Then, if we add a reference to this property in the application.properties file:

# application.properties
application.name=${pom.name}
application.version=${pom.version}
message=${my.filter.value}


执行mvn process-resources

手工改写配置：
# application.properties
java.version=${java.version}
command.line.prop=${command.line.prop}

Now, when you execute the following command (note the definition of the command.line.prop property on the command line), the application.properties file will contain the values from the system properties.

mvn process-resources "-Dcommand.line.prop=hello again"