Java

<target name="create">

   <loadfile srcfile="new.txt" property="fisier" />
   <scriptdef name="substring" language="javascript">
     <attribute name="text" />
     <attribute name="start" />
     <attribute name="end" />
     <attribute name="property" />
     <![CDATA[
       var text = attributes.get("text");
       var end = text.length();
       var start = attributes.get("start")||text.lastIndexOf("=")+2;
       project.setProperty(attributes.get("property"), text.substring(start, end));
     ]]>
  </scriptdef>


      <var name="concat.var" value="" />

       <for param="line" list="${fisier}" delimiter="${line.separator}">
         <sequential>
            <substring text="@{line}" property="subtext" />
            <echo>${subtext}</echo>
            <var name="concat.var" value="${concat.var}_${subtext}"/>
         </sequential>
       </for>
       <property name="concat" value="${concat.var}"/>

       <echo>${concat}</echo>


   </target>