Java Tutorial/Ant/Properties

Built in properties

<?xml version="1.0"?>
<project name="Apache Ant Properties Project" basedir=".">
  
  <target name="properties.built-in">
    <echo message="The base directory: ${basedir}"/>      
    <echo message="This file: ${ant.file}"/>
    <echo message="Ant version: ${ant.version}"/> 
    <echo message="Project name: ${ant.project.name}"/>     
    <echo message="Java version: ${ant.java.version}"/>     
  </target>
</project>

Define custom properties based on the existing properties

<?xml version="1.0"?>
<project name="Apache Ant Properties Project" basedir=".">
  
  <target name="properties.custom">
    <property name="fs" value="${file.separator}"/>
    <property name="ps" value="${path.separator}"/>
    <echo message="File: ${basedir}${fs}build.xml"/>
    <echo message="Path: ${basedir}${fs}build.xml${ps}${basedir}${fs}build.properties"/>
  </target>

</project>

environment properties

<?xml version="1.0"?>
<project name="Apache Ant Properties Project" basedir=".">
  
  <target name="properties">
    <property environment="env"/>
    <echo message="Built on: ${env.OS} ${env.PROCESSOR_ARCHITECTURE}"/>
    <echo message="ANT_HOME: ${env.ant_home}"/>
  </target>

</project>

Properties based on build.properties file

<?xml version="1.0"?>
<project name="Apache Ant Properties Project" basedir=".">
  
  <target name="properties">
    <property file="build.properties"/>
    
    <path id="build.classpath.id">
      <pathelement path="${build.classpath}"/>
    </path>
    <property name="build.classpath.property" refid="build.classpath.id"/>
    <echo message="Server URL: ${server.url}"/>
    <echo message="Build classpath: ${build.classpath}"/>
    <echo message="Build classpath converted: ${build.classpath.property}"/>
  </target>

</project>
File: build.properties
server.name=localhost
server.port=8080
server.scheme=http
server.manager.name=manager
server.url=${server.scheme}://${server.name}:${server.port}/${server.manager.name}/
j2ee.home=C:/j2ee
catalina.home=C:/jakarta-tomcat
j2ee.jar=${j2ee.home}/lib/j2ee.jar
jsp.jar=${catalina.home}/common/lib/jsp-api.jar
servlet.jar=${catalina.home}/common/lib/servlet-api.jar
mysql.jar=${catalina.home}/common/lib/mysql.jar
build.classpath=${mysql.jar};${j2ee.jar};${jsp.jar};${servlet.jar}

Reference defined properties

<?xml version="1.0"?>
<project name="Apache Ant Properties Project" basedir=".">
  
  <target name="properties.custom">
    <property name="project.dtd" location="project.dtd"/>
    <echo message="Location of project.dtd: ${project.dtd}"/>
  </target>

</project>