Maven中的变量

最新推荐文章于 2022-06-10 12:38:30 发布

转载最新推荐文章于 2022-06-10 12:38:30 发布 · 519 阅读

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#maven #properties #variables #documentation #path #user

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本文提供了一个关于Maven2项目属性的清晰概述，包括内置属性、POM/项目属性、本地用户设置、环境变量、Java系统属性、自定义POM属性、父项目变量和反射属性等。

From: http://docs.codehaus.org/display/MAVENUSER/MavenPropertiesGuide

Intro

Because I couldn't find a clear overview of which properties are availabe in maven2 I started this page. It is a collection of things found in the offcial maven documentation and postings to the maven user mailing list.

Note: In Maven 3.0, all pom.* properties are deprecated. Use project.* instead!

Build in properties

${basedir} represents the directory containing pom.xml
${version} equivalent to ${project.version} or ${pom.version}

Pom/Project properties

All elements in the pom.xml, can be referenced with the project. prefix or using pom. as prefix. This list is just an example of some commonly used elements.

${project.build.directory} results in the path to your "target" dir, this is the same as ${pom.project.build.directory}
${project.build.outputDirectory} results in the path to your "target/classes" dir
${project.name} or ${pom.name} refers to the name of the project.
${project.version} or ${pom.version} refers to the version of the project.
${project.build.finalName} refers to the final name of the file created when the built project is packaged

Local user settings

Similarly, values in the user's settings.xml can be referenced using property names with settings. prefix.

${settings.localRepository} refers to the path of the user's local repository

Environment variables

Environment variables can be referenced using the env prefix

${env.M2_HOME} returns the Maven2 installation path.
${java.home} specifies the path to the current JRE_HOME environment use with relative paths to get for example:
<jvm>${java.home}../bin/java.exe</jvm>

Java system properties

All Java System Properties defined by the JVM.

Custom properties in the POM

User defined properties in the pom.xml.

 
          <project>
         
          ...
         
          <properties>
         
          <my.filter.value>hello</my.filter.value>
         
          </properties>
         
          ...
         
          </project>

${my.filter.value} will result in hello if you inserted the above XML fragment in your pom.xml

Parent Project variables

How can parent project variables be accessed?

You can use the prefix: ${project.parent}.

A good way to determine possible variables is to have a look directly at the API. I'm currently using Maven 2.2.1, and to access the Parent you can use ${project.parent}. This will return anorg.apache.maven.project.MavenProject instance.

To access the parent version: ${parent.version}.

Reflection Properties

The pattern ${someX.someY.someZ} can simply sometimes mean getSomeX().getSomeY().getSomeZ(). Thus, properties such as ${project.build.directory} is translated togetProject().getBuild().getDirectory().