Prova a prendere spunto da questo file...spero ti basti cambiare solo i nomi delle directory!
<project name="BuildServlet" default="compile" basedir="..">
<property name="lib.dir" value="${basedir}/lib"/>
<property name="name" value="myServlet"/>
<!--
<property name="servletdir" value="C:/Programmi/Apache Software Foundation/Tomcat 5.0/webapps"/> -->
<property name="servletdir" value="C:/Programmi/Apache Software Foundation/Tomcat 5.0/webapps"/>
<path id="class.path">
<fileset dir="${lib.dir}">
<include name="*.jar"/>
</fileset>
</path>
<target name="compile">
<delete file="${name}.war"/>
<javac srcdir="${basedir}" destdir="${basedir}">
<classpath refid="class.path"/>
</javac>
<war destfile="${name}.war" webxml="web.xml">
<fileset dir="${basedir}" includes="**/*.jsp **/*.html"/>
<classes dir="." includes="**/*.class"/>
<lib dir="${basedir}/lib"/>
</war>

<copy file="${name}.war" todir="${servletdir}"/>

</target>

</project>