Creating jar file from Eclipse

I need to create a jar file from eclipse tool. I have a ant file to create  the jar, but in this case I need to manually create the jar file. The and file looks as below

<echo message="Generating the temp.jar file..." />
 <jar destfile="${dist.dir}/${jar.name}" compress="true" >
      <fileset dir="${output.dir}" />
      <fileset dir="src" >
        <include name="**/*.xml" />
        <include name="**/*.properties" />
        <include name="conf/**" />
      </fileset>
    </jar>

I have seen the export in the file menu of eclipse, but I was doubtful. To make sure I am right, I would like you to guide me
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