How to load Ant properties from property files on the command line? - ant

Question

I have two property files [one.properties and two.properties]. I want to dynamically load the property files into my Ant project from the command line.
My build file name is build.xml.
Command line:
> ant build [How do I pass the property file names here?]

Answer 1

Loading property files from the command line
ant -propertyfile one.properties -propertyfile two.properties
Individual properties may be defined on the command line with the -D flag:
ant -Dmy.property=42
Loading property files from within an Ant project
LoadProperties Ant task
<loadproperties srcfile="one.properties" />
<loadproperties srcfile="two.properties" />
Property Ant task
<property file="one.properties" />
<property file="two.properties" />
Match property files using a pattern
JB Nizet's solution combines concat with fileset:
<target name="init" description="Initialize the project.">
<mkdir dir="temp" />
<concat destfile="temp/combined.properties" fixlastline="true">
<fileset dir="." includes="*.properties" />
</concat>
<property file="temp/combined.properties" />
</target>

Answer 2

Making a build condition such that if Required System parameters are provided for build then only allowing for the next target else build gets fail.
Pass CMD: ant -DclientName=Name1 -Dtarget.profile.evn=dev
Fail CMD: ant
<project name="MyProject" default="myTarget" basedir=".">
<target name="checkParams">
<condition property="isReqParamsProvided">
<and>
<isset property="clientName" /> <!-- if provide read latest else read form property tag -->
<length string="${clientName}" when="greater" length="0" />
<isset property="target.profile.evn" /> <!-- mvn clean install -Pdev -->
<length string="${target.profile.evn}" when="greater" length="0" />
</and>
</condition>
<echo>Runtime Sytem Properties:</echo>
<echo>client = ${clientName}</echo>
<echo>target.profile.evn = ${target.profile.evn}</echo>
<echo>isReqParamsProvided = ${isReqParamsProvided}</echo>
<echo>Java/JVM version: ${ant.java.version}</echo>
</target>
<target name="failOn_InSufficentParams" depends="checkParams" unless="isReqParamsProvided">
<fail>Invalid params for provided for Build.</fail>
</target>
<target name="myTarget" depends="failOn_InSufficentParams">
<echo>Build Success.</echo>
</target>
</project>
#see also: Replace all tokens form file