ClosureCompilerAnt.xml

<?xml version="1.0"?>
<project basedir="." default="build">

	<taskdef name="jscomp" classname="com.google.javascript.jscomp.ant.CompileTask" classpath="lib/compiler.jar"/>
	
	<target name="build" depends="combineJs">
	</target>
	
	<target name="combineJs">
	  
	  	<!-- combine the javascript into a single uncompressed file -->
		<concat destfile="../js/all.js">
			<filelist dir="../js">
				<file name="file1.js"/>
				<file name="file2.js"/>
				<file name="file3.js"/>
			</filelist>
		</concat>
		
		<echo message="concatenated js > all.js."/>
		
		<!-- compile/compress using Google Closure -->
		<jscomp compilationLevel="simple" warning="quiet" debug="false" output="../js/all.min.js">
			<sources dir="../js">
				<file name="all.js" />
			</sources>
		</jscomp>
		
		<echo message="minified js > all.min.js."/>
		
		<copy file="../index.dev.html" tofile="../index.html" overwrite="true" />
		<replaceregexp file="../index.html" match="&lt;\!-- \[start combine\].*\[end combine\] --&gt;" replace="&lt;script type=&quot;text/javascript&quot; src=&quot;js/all.min.js&quot;&gt;&lt;/script&gt;" flags="s" />
	  	
	  	<echo message="created index.html using minified js."/>
	  	
	</target>

</project>