如何用ant来启动和停止tomcat以运行web项目

<project name= "BULLETIN_BOARD" default= "tomcat-start" basedir= "." >

<property name= "source.encoding" value= "Windows-31J" />

<property environment= "env" />

<property name= "source.dir" value= "./" />

<property name= "tomcat.home" value= "C://tomcat6.0" />

<property name= "target.dir" value= "${tomcat.home}/webapps/kotaiSystem" />

<property name= "class.dir" value= "${target.dir}/WEB-INF/classes" />

<target name= "prepare" >

<mkdir dir= "${target.dir}" />

<mkdir dir= "${target.dir}/css" />

<mkdir dir= "${target.dir}/js" />

<mkdir dir= "${target.dir}/jsp" />

<mkdir dir= "${target.dir}/WEB-INF" />

<mkdir dir= "${target.dir}/WEB-INF/lib" />

<mkdir dir= "${class.dir}" />

<copy todir= "${target.dir}" >

<fileset dir= "${source.dir}" includes= "index.jsp" />

</copy>

<copy todir= "${target.dir}/css" >

<fileset dir= "${source.dir}/css" />

</copy>

<copy todir= "${target.dir}/js" >

<fileset dir= "${source.dir}/js" />

</copy>

<copy todir= "${target.dir}/jsp" >

<fileset dir= "${source.dir}/jsp" />

</copy>

<copy todir= "${target.dir}/WEB-INF" >

<fileset dir= "${source.dir}/WEB-INF" />

</copy>

<copy todir= "${target.dir}/WEB-INF/lib" >

<fileset dir= "${source.dir}/WEB-INF/lib" />

</copy>

</target>

<target name= "clean" >

<delete dir= "${target.dir}" />

<delete dir= "${tomcat.home}/work" />

</target>

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

<javac encoding= "${source.encoding}" srcdir= "${source.dir}/WEB-INF/src"

destdir= "${class.dir}"

debug= "on" optimize= "off" deprecation= "off" >

<classpath>

<pathelement path= "${class.dir}" />

<fileset dir= "${source.dir}/WEB-INF/lib" includes= "*.jar" />

</classpath>

</javac>

</target>

</project>