Ant build script for a simple Java Web App

<?xml version="1.0"?> 

<project name="MyWebApp" default="dist" basedir=".">

 <property name="build" location="bin" />

 <property name="src" location="src" />

 <property name="dist" location="dist" />

 <property name="web" location="web" />

 <!-- Set up the 'env' prefix for environment variables -->

 <property environment="env" />

 <property name="lib" location="lib" />

 <property name="version.num" value="1.0" />

 <path id="classpath">

  <fileset dir="${lib}">

   <include name="**/*.jar" />

  </fileset>

  <fileset dir="${env.TOMCAT_HOME}/lib">

   <include name="**/*.jar" />

  </fileset>

 </path>

 <!-- get the source compile classpath in a printable forms -->

 <pathconvert pathsep="${line.separator}|   |-- " property="echo.path.compile" refid="classpath">

 </pathconvert>

 <!-- 0. Abort the build if TOMCAT_HOME is not set -->

 <target name="checkTomcatHome" unless="env.TOMCAT_HOME">

  <fail message="TOMCAT_HOME must be set!" />

 </target>

 <!-- 0. PRINT DEFAULTS. -->

 <target name="print_default_properties">

  <echo message="os.name:          ${os.name}" />

  <echo message="basdir:           ${basedir}" />

  <echo message="ant.file:         ${ant.file}" />

  <echo message="ant.project.name: ${ant.project.name}" />

  <echo message="ant.java.version: ${ant.java.version}" />

  <echo message="tomcat_base:      ${env.TOMCAT_HOME}" />

  <echo message="|-- compile classpath" />

  <echo message="|   |" />

  <echo message="|   |-- ${echo.path.compile}" />

 </target>

 <!-- 1. CLEAN the build generated artifacts. -->

 <target name="clean">

  <delete dir="${build}" />

  <delete dir="${dist}" />

 </target>

 <!-- 2. INITIALIZE the build. -->

 <target name="init" depends="print_default_properties, checkTomcatHome">

  <mkdir dir="${build}" />

 </target>

 <!-- 3. COMPILE the source files. -->

 <target name="compile" depends="init">

  <!-- Compile the java code -->

  <javac srcdir="${src}" destdir="${build}" classpathref="classpath" debug="on" />

 </target>

 <!-- 4. Create the DISTRIBUTION. -->

 <target name="dist" depends="compile">

  <mkdir dir="${dist}" />

  <copy todir="${build}">

   <fileset dir="${basedir}">

    <include name="*.properties" />

    <include name="*.xml" />

    <include name="*.xsd" />

   </fileset>

  </copy>

  <war destfile="${dist}/${ant.project.name}.war" webxml="${web}/WEB-INF/web.xml">

   <manifest>

    <attribute name="Built-By" value="${user.name}" />

    <attribute name="Implementation-Version" value="${version.num}" />

    <attribute name="Built-Date" value="${TODAY}" />

   </manifest>

   <fileset dir="${web}" />

   <lib dir="${lib}">

    <include name="**/*.jar"/>

   </lib>

   <classes dir="${build}" />

  </war>

 </target>

 <!-- 5. DEPLOY the generated WAR to tomcat. -->

 <target name="deploy" depends="dist">

  <echo>Deploying to ${env.TOMCAT_HOME}</echo>

  <copy todir="${env.TOMCAT_HOME}/webapps">

   <fileset dir="${dist}">

    <include name="${ant.project.name}.war" />

   </fileset>

  </copy>

 </target>

 <!-- HELP -->

 <target name="help">

  <echo message="help         - Displays help menu">

  </echo>

  <echo message="compile      - (default) Builds Java classes">

  </echo>

  <echo message="dist         - Creates web applicaiton .war ">

  </echo>

  <echo message="clean        - Delete built .class and .war files, leave directories">

  </echo>

  <echo message="deploy       - Deploy to local tomcat installation">

  </echo>

 </target>

</project>

</pre>