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<project name="MyProject" default="dist" basedir=".">
    <description>
        simple example build file
    </description>
  <!-- set global properties for this build -->
  <property name="src" location="src"/>
  <property name="build" location="build"/>
  <property name="dist"  location="dist"/>

  <target name="init">
    <!-- Create the time stamp -->
    <tstamp/>
    <!-- Create the build directory structure used by compile -->
    <mkdir dir="${build}"/>
  </target>

  <target name="compile" depends="init"
        description="compile the source " >
    <!-- Compile the java code from ${src} into ${build} -->
    <javac srcdir="${src}" destdir="${build}"/>
  </target>

  <target name="dist" depends="compile"
        description="generate the distribution" >
    <!-- Create the distribution directory -->
    <mkdir dir="${dist}/lib"/>

    <!-- Put everything in ${build} into the MyProject-${DSTAMP}.jar file -->
    <jar jarfile="${dist}/lib/MyProject-${DSTAMP}.jar" basedir="${build}"/>
  </target>

  <target name="clean"
        description="clean up" >
    <!-- Delete the ${build} and ${dist} directory trees -->
    <delete dir="${build}"/>
    <delete dir="${dist}"/>
  </target>
</project>

Buildfile: E:\project\ztest\WebContent\build.xml
prepare:
     [echo] Build Start!! ======> 2009.03.04-10:41
clean:
   [delete] Deleting directory E:\project\ztest\WebContent\dist
compile:
    [mkdir] Created dir: E:\project\ztest\WebContent\build
mkjar:
    [mkdir] Created dir: E:\project\ztest\WebContent\dist
      [jar] Warning: skipping jar archive E:\project\ztest\WebContent\dist\1.0_helloprint.jar because no files were included.
      [jar] Building MANIFEST-only jar: E:\project\ztest\WebContent\dist\1.0_helloprint.jar
dist:
     [copy] Copied 1 empty directory to 1 empty directory under E:\project\ztest\WebContent\dist\lib
     [copy] Copied 1 empty directory to 1 empty directory under E:\project\ztest\WebContent\dist\src
      [zip] Building zip: E:\project\ztest\WebContent\2009.03.04_1.0_helloprint.zip
BUILD SUCCESSFUL
Total time: 203 milliseconds