?? j2ssh-sftp.htm
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<h2><font face="Verdana, Arial, Helvetica, sans-serif"><a name="top"></a>J2SSH - SFTP Client Connectivity </font></h2>
<p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><a href="#makeconnection">Making
the connection</a><br>
<a href="#readfile">Reading a file</a><br>
<a href="#sendfile">Sending Files</a><br>
<a href="#delfile">Deleting Files or Directories</a><br>
<a href="#createdir">Creating a Directory</a><br>
<a href="#createnesteddir">Creating Nested Directories</a><br>
<a href="#renamefiles">Renaming Files</a><br>
<a href="#chmodfiles">Changing permissions on files</a></font></p>
<p><br>
<strong><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> Introduction</font></strong></p>
<p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">SFTP is an interactive
file transfer protocol which performs all operations over the SSH transport,
it is a replacement for the original SCP (Secure Copy) protocol that existed
in SSH1. It is highly recommended that SFTP be used to perform file transfers
in preference to the legacy FTP protocol as authentication details are transmitted
in plain-text format with the latter, and as such may be compromised through
"password sniffing" attacks.</font></p>
<p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> The following
J2SSH namespace must be imported into a class wishing to incorporate SFTP functionality:<br>
</font>
<blockquote>
<pre><font size="2">import com.sshtools.j2ssh.SftpClient;</font></pre>
</blockquote>
<p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><strong><a name="makeconnection"></a>Making
the connection</strong><br>
In order to transfer files through SFTP, you must first open an SftpClient connection
from a connected and authenticated SshClient object. This will initialise the
SFTP subsystem for usage.</font> </p>
<blockquote><pre>SftpClient sftp = ssh.openSftpClient();</pre></blockquote>
<p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> </font><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><strong>Reading
a file</strong><a name="readfile"></a><br>
In order to read a file you should use the get method of the SftpClient.</font>
</p>
<blockquote>
<pre><font size="2">// Copy the file to the local computer<br>sftp.get("temp.exe", "c:/temp.exe");</font><font size="2" face="Verdana, Arial, Helvetica, sans-serif"></font></pre>
</blockquote>
<font size="2" face="Verdana, Arial, Helvetica, sans-serif">
<p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><strong> Sending
Files<a name="sendfile"></a></strong></font></p>
<p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Use the put command
to send files to the server.</font></p>
</font>
<blockquote>
<pre><font size="2">// Sends a file to the remote server
sftp.put("c:/temp.exe", "/root/temp.exe");</font></pre>
</blockquote>
<font size="2" face="Verdana, Arial, Helvetica, sans-serif">
<p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"></font><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><strong>Deleting
Files or Directories<a name="delfile"></a></strong></font></p>
<p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Use the rm command
to delete files or empty directories.</font></p>
</font>
<blockquote>
<pre><font size="2">sftp.rm(authorizationFile + ".bak");</font><font size="2" face="Verdana, Arial, Helvetica, sans-serif"></font></pre>
</blockquote>
<font size="2" face="Verdana, Arial, Helvetica, sans-serif">
<p><font size="2" face="Courier New, Courier, mono"><strong></strong></font><font size="2" face="Courier New, Courier, mono"><strong><font face="Verdana, Arial, Helvetica, sans-serif">Creating
a Directory<a name="createdir"></a></font></strong></font></p>
<p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Use the mkdir command
to create a new directory, the new directory will be placed in the current SFTP
directory.</font></p>
</font>
<blockquote>
<pre><font size="2">sftp.mkdir("newdir");</font></pre>
</blockquote>
<font size="2" face="Verdana, Arial, Helvetica, sans-serif">
<p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><strong> <a name="createnesteddir"></a>Creating
Nested Directories</strong></font></p>
<p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">You can use the
mkdirs command to create nested directory structure quickly. This method will
create any directories that are not present in the directory path parameter.</font></p>
</font>
<blockquote>
<pre><font size="2">// Creates four new nested directories in one go
sftp.mkdirs("/root/new/new2/new3/new4");</font></pre>
</blockquote>
<font size="2" face="Verdana, Arial, Helvetica, sans-serif">
<p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><strong> <a name="renamefiles" id="renamefiles"></a>Renaming
Files</strong></font></p>
<p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">To rename a file
or directory use the rename command on the SftpClient object.</font></p>
</font>
<blockquote>
<pre><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> </font><font size="2">sftp.rename("FromName.txt", "ToName.txt");</font></pre>
</blockquote>
<p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><strong><a name="chmodfiles"></a>Changing
Permissions on Files</strong></font></p>
<p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">In order to change
permissions associated with files, we use the chmod method of the SftpClient
class to specify permissions in an octal format. The relevant octal values are
listed below.</font></p>
<blockquote>
<pre>sftp.chmod(666, "/root/temp.exe");</pre>
</blockquote>
<p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Absolute modes
are octal numbers specifying the complete list of attributes for the files.
You specify attributes by OR'ing together these bits:</font></p>
<blockquote>
<p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">01000000 temporary
file <br>
02000000 compressed file <br>
4000 Hidden file (setuid bit) <br>
2000 System file (setgid bit) <br>
1000 Archive bit (sticky bit) <br>
0400 Individual read <br>
0200 Individual write <br>
0100 Individual execute (or list directory) <br>
0040 Group read <br>
0020 Group write <br>
0010 Group execute <br>
0004 Other read <br>
0002 Other write <br>
0001 Other execute</font></p>
</blockquote>
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