how to get version from jar file in jenkins - shell

Question

I created a job in jenkins with maven for my java project. My jar name is
artifactId-version.jar and I am deploying this jar to artifactory server. I
have 5 to 6 jar files like this which are deployed to artifact.
My build command is
clean install -Dversion=$BUILD_NUMBER -Denv=r -DskipITs
so that my jar is like example-r-23.jar and under execute shell I have written as
echo $BUILD_NUMBER > src/sonarCharts/latest.txt
and sending this file to Artifactory. I am using curl command to read the
value in latest.txt file and downloading jar file.I am downloading them from
my code through shell script (using wget command like wget --user --
password http://artifactory/example-1.0.jar).
This process repeats for every release. Once i deliver my code to production,
i am changing this version to 2.0 and now jar file will be like example-
2.0.jar and deploying it to artifact.I need to change my script file every
time jar version is changed.
<artifactId>rabbitMQHandler</artifactId>
<version>1.0</version>
<name>rabbitMQHandler</name>
<url>http://maven.apache.org</url>
I followed one procedure by overwriting the version with Build number and
passing it from command line as
mvn clean install -Dversion=$BUILD_NUMBER --- to build
and i am sending this BUILD_NUMBER to one txt file as
echo $BUILD_NUMBER > latest.txt --- sending this to artifactory
and placing that file in artifactory. I am reading that txt file through shell
script using curl and i am using that number in wget command.
I feel my way of doing is not correct and is there any other way of doing it.