从Maven POM文件读取属性文件 [英] Reading properties file from Maven POM file

问题描述

我有一些配置的Maven POM文件，在部分插件中，我有一些配置的maven tomcat插件，如下所示:

I have Maven POM file with some configuration and in the section plugins, I have maven tomcat plugin with some configuration like this:

<configuration>
   <url>http://localhost:8080/manager/html</url>
   <server>tomcat</server>
</configuration>

我想使用该键将url设置导出到某些属性文件，例如tomcat.properties:

I'd like to export url setting to some property file for example tomcat.properties with that key:

url=http://localhost:8080/manager/html

该如何在我的POM文件中重新读取此密钥?

And how can I read this key back in my POM file?

推荐答案

Maven允许您在项目的POM中定义属性.您可以使用类似于以下内容的POM文件进行此操作:

Maven allows you to define properties in the project's POM. You can do this using a POM file similar to the following:

<project>
    ...
    <properties>
        <server.url>http://localhost:8080/manager/html</server.url>
    </properties>
    ...
    <build>
        <plugins>
            <plugin>
            ...
                <configuration>
                    <url>${server.url}</url>
                    <server>tomcat</server>
                </configuration>
            ...
            </plugin>
        </plugins>
    </build>
</project>

您可以避免在properties标记中指定属性，而将命令行中的值传递为:

You can avoid specifying the property within the properties tag, and pass the value from the command line as:

mvn -Dserver.url=http://localhost:8080/manager/html some_maven_goal

现在，如果您不想从命令行中指定它们，并且如果您需要将这些属性与项目POM进一步隔离，请放入属性文件中，那么您将需要使用初始化Maven生命周期的阶段.此处复制了插​​件页面中的示例:

Now, if you don't want to specify them from the command line and if you need to further isolate these properties from the project POM, into a properties file, then you'll need to use the Properties Maven plugin, and run it's read-project-properties goal in the initialize phase of the Maven lifecycle. The example from the plugin page is reproduced here:

<project>
  <build>
    <plugins>
      <plugin>
        <groupId>org.codehaus.mojo</groupId>
        <artifactId>properties-maven-plugin</artifactId>
        <version>1.0-alpha-2</version>
        <executions>
           <!-- Associate the read-project-properties goal with the initialize phase, to read the properties file. -->
          <execution>
            <phase>initialize</phase>
            <goals>
              <goal>read-project-properties</goal>
            </goals>
            <configuration>
              <files>
                <file>etc/config/dev.properties</file>
              </files>
            </configuration>
          </execution>
        </executions>
      </plugin>
    </plugins>
  </build>
</project>

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