How to set values for properties tag of maven by reading the .properties file - maven

Question

I have 5 projects, here I want to copy the java classes from one non-maven project to maven project for this requirement I used maven-ant-plugin. with this I am able to do the copy successfully.
pom.xml
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.test</groupId>
<artifactId>Test</artifactId>
<version>0.0.1-SNAPSHOT</version>
<properties>
<project1_maven.src.main.java>c:/maven1/src/main/java</project1_maven.src.main.java>
<project1_maven.src.test.java>c:/maven1/src/test/java</project1_maven.src.test.java>
<project1.nonmaven.src>c:/non-maven1/src</project1.nonmaven.src>
<project1.nonmaven.test>c:/non-maven1/test</project1.nonmaven.test>
</properties>
<build>
<plugins>
<plugin>
<artifactId>maven-antrun-plugin</artifactId>
<version>1.7</version>
<executions>
<execution>
<phase>install</phase>
<configuration>
<target>
<copy file="${project1.nonmaven.src}"
todir="${project1_maven.src.main.java}" />
<copy file="${project1.nonmaven.test}"
todir="${project1_maven.src.test.java}" />
</target>
</configuration>
<goals>
<goal>run</goal>
</goals>
</execution>
</executions>
</plugin>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.3</version>
<configuration>
<source>1.6</source>
<target>1.6</target>
</configuration>
</plugin>
</plugins>
<sourceDirectory>src</sourceDirectory>
<resources>
<resource>
<directory>src</directory>
<excludes>
<exclude>**/*.java</exclude>
</excludes>
</resource>
</resources>
</build>
</project>
But here my question is, instead of giving the source and destination paths (I want to give this like for remaining 4 projects) inside the pom.xml directly, I just want to read it from the properties file.
for example :
<project1.nonmaven.src>
${get the location from property bundle by using key}</project1.nonmaven.src>
Can you please some one suggest me how ??
Thanks.