ant 生成javadoc

<target name="create_doc">
	  <!-- destdirjavadoc -->
	  <javadoc destdir="bin/api" encoding="UTF-8" docencoding="UTF-8">
	   <!-- dirjavaclass -->
	   <packageset dir="src">
	    <!-- excludejavadoc 
	    <exclude name="${excludeClasses}" />
	    -->
	   </packageset>
	  </javadoc>
	 </target>