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Built In Properties

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In this section, you will learn how to access various system properties using ant.

Built In Properties

     

This example illustrates how to access various system properties using Ant. Ant provides access to all system properties as if they had been defined using a <property> task. Here is a list of the properties with descriptions.

 

 

 

 

 

Property

Description

basedir 

the absolute path of the project's basedir (as set with the basedir attribute of <project>).

ant.file

the absolute path of the buildfile.

ant.version 

the version of Ant

ant.project.name

the name of the project that is currently executing; it is set in the name attribute of <project>.

ant.java.version

the JVM version Ant detected; currently it can hold the values "1.2", "1.3", "1.4" and "1.5".

ant.home

home directory of Ant

java.version

JRE version

java.vendor

JRE vendor

java.vendor.url 

Java vendor URL

java.home

Java installation directory

java.vm.specification.version

JVM specification version

java.vm.specification.vendor

JVM specification vendor

java.vm.specification.name

JVM specification name

java.vm.version

JVM implementation version

java.vm.vendor 

JVM implementation vendor

java.vm.name 

JVM implementation name

java.specification.version

JRE specification version

java.specification.vendor

JRE specification vendor

java.specification.name

JRE specification name

java.class.version

Java class format version number

java.class.path

Java class path

java.ext.dirs

Path of extension directory or directories

os.name

Operating system name

os.arch 

Operating system architecture

os.version

Operating system version

file.separator

File separator ("/" on UNIX)

path.separator

Path separator (":" on UNIX)

line.separator

Line separator ("\n" on UNIX)

user.name

User's account name

user.home

User's home directory

user.dir

User's current working directory

 

The source code of build.xml file

<project name="Built-In-Properties" default="echo" basedir=".">
<property environment="env"/>
<target name="echo">
  <echo message="basedir : ${basedir}"/>

  <echo message="ant.file : ${ant.file}"/>
  <echo message="ant.project.name : ${ant.project.name}"/>
  <echo message="ant.home : ${ant.home}"/>
  <echo message="ant.version : ${ant.version}"/> 
  <echo message="ant.java.version : ${ant.java.version}"/>

  <echo message="java.version : ${java.version}"/>
  <echo message="java.vendor : ${java.vendor}"/>
  <echo message="java.vendor.url : ${java.vendor.url}"/>
  <echo message="java.home : ${java.home}"/>
  <echo message="java.vm.specification.version : ${java.vm.specification.version}"/>
  <echo message="java.vm.specification.vendor : ${java.vm.specification.vendor}"/>
  <echo message="java.vm.specification.name : ${java.vm.specification.name}"/>
  <echo message="java.vm.version : ${java.vm.version}"/>
  <echo message="java.vm.vendor : ${java.vm.vendor}"/>
  <echo message="java.vm.name : ${java.vm.name}"/>
  <echo message="java.specification.version : ${java.specification.version}"/>
  <echo message="java.specification.vendor : ${java.specification.vendor}"/>
  <echo message="java.specification.name : ${java.specification.name}"/>
  <echo message="java.class.version : ${java.class.version}"/>
  <echo message="java.class.path : ${java.class.path}"/>
  <echo message="java.ext.dirs : ${java.ext.dirs}"/>

  <echo message="os.name : ${os.name}"/>  
  <echo message="os.arch : ${os.arch}"/>
  <echo message="os.version : ${os.version}"/>

  <echo message="file.separator : ${file.separator}"/>
  <echo message="path.separator : ${path.separator}"/>
  <echo message="line.separator : ${line.separator}"/>  

  <echo message="user.home : ${user.home}"/>
  <echo message="user.name : ${user.name}"/>
  <echo message="user.dir : ${user.dir}"/>

  <echo message="Path: ${env.Path}"/>
  <echo message="Hostname: ${env.COMPUTERNAME}"/>
  </target>

</project>


 Run this code – the following output will be displayed.


Download Source Code

     

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Posted on: September 6, 2008

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