Java: What is the best way to SFTP a file from a server?

Another option is to consider looking at the JSch library. JSch seems to be the preferred library for a few large open source projects, including Eclipse, Ant and Apache Commons HttpClient, amongst others. It supports both user/pass and certificate-based logins nicely, as well as all a whole host of other yummy SSH2 features.

Here's a simple remote file retrieve over SFTP. Error handling is left as an exercise for the reader :-) JSch jsch = new JSch(); String knownHostsFilename = "/home/username/. Ssh/known_hosts"; jsch.

SetKnownHosts( knownHostsFilename ); Session session = jsch. GetSession( "remote-username", "remote-host" ); { // "interactive" version // can selectively update specified known_hosts file // need to implement UserInfo interface // MyUserInfo is a swing implementation provided in // examples/Sftp. Java in the JSch dist UserInfo ui = new MyUserInfo(); session.

SetUserInfo(ui); // OR non-interactive version. Relies in host key being in known-hosts file session. SetPassword( "remote-password" ); } session.connect(); Channel channel = session.

OpenChannel( "sftp" ); channel.connect(); ChannelSftp sftpChannel = (ChannelSftp) channel; sftpChannel. Get("remote-file", "local-file" ); // OR InputStream in = sftpChannel. Get( "remote-file" ); // process inputstream as needed sftpChannel.exit(); session.disconnect().

1 Cheekysoft, I noticed - while using Jsch - removing files on the sftp-server does not work. Also renaming files does not work too. Any ideas please?

Andy – andy Jan 31 at 1:24 1 Sorry, it is not something I work with at the moment. (Please try and leave these sort of responses as comments -- like this message -- and not as a new answer to the original question) – Cheekysoft Jan 31 at 1:24.

This was the solution I came up with sourceforge.net/projects/sshtools/ (most error handling omitted for clarity). This is an excerpt from my blog SshClient ssh = new SshClient(); ssh. Connect(host, port); //Authenticate PasswordAuthenticationClient passwordAuthenticationClient = new PasswordAuthenticationClient(); passwordAuthenticationClient.

SetUsername(userName); passwordAuthenticationClient. SetPassword(password); int result = ssh. Authenticate(passwordAuthenticationClient); if(result!

= AuthenticationProtocolState. COMPLETE){ throw new SFTPException("Login to " + host + ":" + port + " " + userName + "/" + password + " failed"); } //Open the SFTP channel SftpClient client = ssh.openSftpClient(); //Send the file client. Put(filePath); //disconnect client.quit(); ssh.disconnect().

J2ssh is pretty buggy – Bruce Blackshaw Feb 13 '10 at 5:13 1 I agree (belatedly), it worked fine for the original site/download I required but it refuesed to work for the new one. I'm in the process of switching to JSch – David Hayes Jan 27 at 14:09.

A nice abstraction on top of Jsch is Apache commons-vfs which offers a virtual filesystem API that makes accessing and writing SFTP files almost transparent. Worked well for us.

– bene May 15 '09 at 13:46 Yes it is. If you need non-standard identities you can call SftpFileSystemConfigBuilder.getInstance(). SetIdentities(...).

– Russ Hayward Jan 27 at 11:05.

Here is the complete source code of an example using JSch without having to worry about the ssh key checking. Import com.jcraft.jsch. *; public class TestJSch { public static void main(String args) { JSch jsch = new JSch(); Session session = null; try { session = jsch.

GetSession("username", "127.0.0.1", 22); session. SetConfig("StrictHostKeyChecking", "no"); session. SetPassword("password"); session.connect(); Channel channel = session.

OpenChannel("sftp"); channel.connect(); ChannelSftp sftpChannel = (ChannelSftp) channel; sftpChannel. Get("remotefile. Txt", "localfile.

Txt"); sftpChannel.exit(); session.disconnect(); } catch (JSchException e) { e.printStackTrace(); //To change body of catch statement use File | Settings | File Templates. } catch (SftpException e) { e.printStackTrace(); } } }.

Below is an example using Apache Common VFS: FileSystemOptions fsOptions = new FileSystemOptions(); SftpFileSystemConfigBuilder.getInstance(). SetStrictHostKeyChecking(fsOptions, "no"); FileSystemManager fsManager = VFS.getManager(); String uri = "sftp://user:password@host:port/absolute-path"; FileObject fo = fsManager. ResolveFile(uri, fsOptions).

I use this SFTP API called Zehon, it's great, so easy to use with a lot of sample code. Here is the site zehon.com.

I found complete working example for SFTP in java using JSCH API vigilance.co.in/java-program-for-uploadi....

Andy , to delete file on remote system,you need to use (channelExec) of JSch and pass unix/linux commands to delete it.

The best solution I've found is Paramiko. There's a Java version.

You also have JFileUpload with SFTP add-on (Java too): jfileupload.com/products/sftp/index.html.

Try edtFTPj/PRO, a mature, robust SFTP client library that supports connection pools and asynchronous operations. Also supports FTP and FTPS so all bases for secure file transfer are covered.

Sshj has a complete implementation of SFTP version 3 (what OpenSSH implements).

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