In this section, you will learn how to create a build.properties file.

Value in the properties file overwrite the value in the build.xml

     

This example illustrates how to create a build.properties file in the C:\apache-tomcat-6.0.16\webapp\antBuild\build.properties and overwrite it's properties in the build.xml file. In this example, <property name="build.path"> is used to map the path of build.xml and build.properties file, <property url="http://localhost:8080/antBuild/build.properties"> is used to root url of properties file, <property file="build.properties" prefix="imported"> is used to define the property of the build.properties file and  <property environment="env"> is used to create an environment variable that is 'env'. Now the target <target name="built-in-properties"> is used to find base directory name, ant file name, version of ant, project name and version of java. The target <target name="build.path"> is used to print the file name and path of file and finally <target name="environment"> is used to print the processor architecture name and operating system name and print the ant home directory name.

Source code of build.xml:

<project name="Properties" basedir="." default="environment">   <property name="build.path" value="${basedir}/build.xml:${basedir}/build.properties"/>   <property url="http://localhost:8080/antBuild/build.properties"/>   <property file="build.properties" prefix="imported"/>   <property environment="env"/>      <target name="built-in properties">   <echo message="The base directory is: ${basedir}"/>     <echo message="The ant file is: ${ant.file}"/>   <echo message="The Ant version is: ${ant.version}"/>    <echo message="The Project name is: ${ant.project.name}"/>    <echo message="The Java version is: ${ant.java.version}"/>    </target>   <target name="build.path" depends="built-in properties">   <echo message="The File name is: ${basedir}${file.separator}build.xml"/>   <echo message="Path structure: ${basedir}${file.separator}build.xml${path.separator}    ${basedir}${file.separator}build.properties"/>   </target>   <target name="environment" depends="build.path">   <echo message="Built on: ${env.OS} ${env.PROCESSOR_ARCHITECTURE}"/>   <echo message="ANT_HOME Directory name: ${env.ANT_HOME}"/>   </target> </project>

source code of build.properties:

property.example=Local File property.file.example=build.properties

Run this program on command prompt - the following output will be displayed.

Download Source Code

     

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