The attached patch is a quick hack to implement sftp task, which
is based on ftp task and using jsch for sftp functionality.
It accepts attributes for ftp and scp tasks except for 'binary',
'passive', 'separator' and 'umask'.

It seems following tasks are working on my testing, however, frankly to say,
I'm not familiar with ftp task and have never used and run it, so I may
mis-understand its operational semantics.  Comments, suggestions and feedbacks
are welcome.

PS 1. that patch is for ant_20060509104815.tar.gz
PS 2. jsch-0.1.28 is required.

 <taskdef name="sftp" 
classname="org.apache.tools.ant.taskdefs.optional.ssh.SFTP"/>

 <sftp action="send"
      server="${server}"
      userid="${userid}"
      password="${password}"
      remotedir="incoming"
      depends="yes">
    <fileset dir="htdocs/manual"/>
 </sftp>

 <sftp action="get"
      server="${server}"
      userid="${userid}"
      password="${password}">
   <fileset dir="htdocs/manual" >
     <include name="**/*.html"/>
   </fileset>
 </sftp>

 <sftp action="del"
      server="${server}"
      userid="${userid}"
      password="${password}" >
   <fileset>
     <include name="**/*.tmp"/>
   </fileset>
 </sftp>

 <sftp action="list"
      server="${server}"
      userid="${userid}"
      password="${password}"
      listing="data/sftp.listing" >
   <fileset>
     <include name="**"/>
   </fileset>
 </sftp>

 <sftp action="mkdir"
      server="${server}"
      userid="${userid}"
      password="${password}"
      remotedir="test" />

 <sftp action="chmod"
      server="${server}"
      userid="${userid}"
      password="${password}"
      chmod="0700" >
   <fileset>
     <include name="*.log"/>
   </fileset>
 </sftp>