网址：http://antelope.tigris.org/

我用到过一个控制时间的标签

2。ant-contrib

网址：ant-contrib.sourceforge.net

我用到过<if><else><then>等逻辑标签。

下面是我写的一个ant片断，用来copy不存在的文件，如果存在，则询问是否覆盖。
 <!--  tasks for copy required system files -->

 <taskdef resource="net/sf/antcontrib/antcontrib.properties" classpath="../WEB-INF/lib/ant-contrib-1.0b2.jar" />

 <target name="deploySysFiles">
  <var name="targetFile" unset="true" />
  <property name="targetFile" value="${JavaStatusSchemePath}" />
  <var name="originalFile" unset="true"/>
  <property name="originalFile" value="${JavaStatusSchemePath-Original}"/>
  <antcall target="deploySysFile" />
 </target>

 <target name="deploySysFile">
  <echo>check file : ${targetFile} exist or not</echo>
  <available file="${targetFile}" property="targetFileExisting" />
  <if>
   <not>
    <isset property="targetFileExisting" />
   </not>
   <then>
    <antcall target="copyTargetFile" />
   </then>
   <elseif>
    <isset property="targetFileExisting" />
    <then>
     <antcall target="overrideTargetFile" />
    </then>
   </elseif>
  </if>
  <echo>deploy system files over</echo>
 </target>

 <target name="overrideTargetFile">
  <limit seconds="${timeoutSecond}">
   <input validargs="y,n" addproperty="answer" defaultvalue="n" message="file '${targetFile}' already existed,do you want to override?" />
  </limit>
  <condition property="override">
   <equals arg1="y" arg2="${answer}" />
  </condition>
  <if>
   <isset property="override" />
   <then>
    <echo>override the file...</echo>
    <copy tofile="${targetFile}" file="${originalFile}" overwrite="true" encoding="ms932" />
   </then>
  </if>
 </target>
 <target name="copyTargetFile">
  <echo>file ${targetFile} dose not existed,deploying this file</echo>
  <copy file="${originalFile}" tofile="${targetFile}" encoding="ms932" />
 </target>
 <!-- end copy system files. -->