據說是最完整的ANT的build.xml

<?xml version="1.0" encoding="GB2312" ?>
<!--
=======================================================================
hello-ant 項目 ,學習ant工具的build file.

參照ant的jakarta-ant-1.6alpha的build.xml

Copyright (c) 2002 The Neusoft Software Foundation. All rights
reserved.

=======================================================================
-->
<!--
文檔結構爲:
<project>
<property/> 全局變量的定義
<property/>...

<target name="1"> 任務組(tasks)
<javac></javac> 一項javac任務
...
<oneTask></ontTask> 一項其它任務
</target>

<target name="2">
<javac></javac>
...
<oneTask></ontTask>
</target>
</project>

project代表一個項目，
default:運行到名稱爲"dist"的target(任務組)
basedir:基準路徑。
-->
<project default="dist" basedir=".">

<!--
===================================================================
定義屬性（property tasks）
最好把用到的路徑呀，名稱呀都在這裏定義成全局變量
例：定義
<property name="a" value="hello"/>
以後就可以這樣用它：
<property name="b" value="${a}/b"/>
現在:b=="hello/b"
===================================================================
-->

<!--主要的系統環境屬性-->
<property environment="env"/><!--取window,unix...的環境變量-->
<property name="java.home" value="${env.JAVA_HOME}"/>
<property name="ant.home" value="${env.ANT_HOME}"/>

<!--主要的app環境屬性-->
<property name="app.name" value="hello-ant"/>
<property name="app.jar" value="${app.name}.jar"/>
<property name="app.copyright" value=" Copyright (c) 2002 The Neusoft Software Foundation. All rights reserved."/>

<!--app中src的屬性-->
<property name="src.dir" value="src" />
<property name="src.main" value="${src.dir}/main"/>
<property name="src.script" value="${src.dir}/script"/>

<!--app用到的lib-->
<property name="lib.dir" value="lib"/>

<!--app的build目錄中-->
<property name="build.dir" value="build" />
<property name="build.classes" value="${build.dir}/classes"/>
<property name="build.docs" value="${build.dir}/docs"/>
<property name="build.docs.api" value="${build.docs}/api"/>
<property name="build.lib" value="${build.dir}/lib"/>

<!--app的dist (distribution) 目錄中-->
<property name="dist.dir" value="dist"/>
<property name="dist.bin" value="${dist.dir}/bin"/>
<property name="dist.docs" value="${dist.dir}/docs"/>
<property name="dist.lib" value="${dist.dir}/lib"/>

<!--app的docs目錄中-->
<property name="docs.dir" value="docs"/>

<!--
定義一組路徑以後可以通過id重用這組路徑 ，例：
<javac srcdir="src/main" destdir="build/classes">
<classpath refid="classpath"/>
</javac>
-->
<path id="classpath">
<!--本項目只有一個java，用不上classpath，這裏只是做個例子-->
<pathelement location="${build.classes}"/>
<pathelement path="${java.home}/lib/tools.jar"/>
</path>

<!--
===================================================================
init 準備目錄(File Tasks)
主要的目錄結構通常是不會變的，一起生成他們
===================================================================
-->
<target name="init">
<!--清除以前目錄-->
<delete dir="${build.dir}" failonerror="false" />
<delete dir="${dist.dir}" failonerror="false"/>

<!--準備目錄-->
<mkdir dir="${build.dir}"/>
<mkdir dir="${build.classes}"/>
<mkdir dir="${build.docs}"/>
<mkdir dir="${build.docs.api}"/>
<mkdir dir="${build.lib}"/>

<mkdir dir="${dist.dir}"/>
<mkdir dir="${dist.bin}"/>
<mkdir dir="${dist.lib}"/>

</target>

<!--
===================================================================
Build the code (Compile Tasks,File Tasks)
===================================================================
-->
<target name="build" depends="init">
<!--編譯-->
<javac srcdir="${src.main}" destdir="${build.classes}">
<classpath refid="classpath"/>
</javac>
</target>

<!--
===================================================================
打包文檔(Archive Tasks)
Create the project jars: xxx1.jar and xxx2.jar
===================================================================
-->
<target name="jars" depends="build">
<jar basedir="${build.classes}" jarfile="${build.lib}/${app.jar}"/>
</target>

<!--
===================================================================
Creates the API documentation
===================================================================
-->
<target name="javadocs"
depends="jars"
description="--> creates the API documentation">
<!--copy docs 手冊... -->
<copy todir="${build.docs}">
<fileset dir="${docs.dir}"/>
</copy>

<javadoc packagenames="hello.ant.*"
sourcepath="${src.main}"
defaultexcludes="yes"
destdir="${build.docs.api}"
author="true"
version="true"
use="true"
windowtitle="Docs API">
<doctitle><![CDATA[<h1>hello ant Docs API</h1>]]></doctitle>
<bottom><![CDATA[<i>${app.copyright}</i>]]></bottom>
<tag name="todo" scope="all" description="To do:" />
</javadoc>
</target>

<!--
===================================================================
Create the distribution that can run (Archive Tasks)
主要是從各目錄中把該copy的copy上
===================================================================
-->
<target name="dist" depends="javadocs">
<!--copy bin 執行文件 -->
<copy todir="${dist.bin}">
<fileset dir="${src.script}/"/>
</copy>
<copy todir="${dist.docs}">
<fileset dir="${build.docs}/"/>
</copy>
<!-- copy lib 文件 -->
<copy todir="${dist.lib}">
<fileset dir="${build.lib}/"/>
</copy>

</target>
<!--
===================================================================
Cleans everything(File Tasks)
例如可以刪除build中的文件
===================================================================
-->
</project>