How Can I Retrieve a File from an SFTP Server Using Java and JSch?

Retrieving a File from a Server via SFTP in Java

To retrieve a file from a remote server using SFTP, Java programmers have several options at their disposal. One popular choice is the JSch library.

Using JSch for SFTP File Retrieval

JSch is a widely-used library for SSH and SFTP operations in Java. It provides comprehensive support for both password-based and certificate-based authentication, along with a range of other SSH2 features.

For a simple SFTP file retrieval using JSch, you can follow these steps:

1. Create a new JSch instance.
2. Set the known host keys using setKnownHosts.
3. Establish an SSH session by creating a Session object using getSession.
4. Set user authentication information via setUserInfo or setPassword.
5. Connect the session using connect.
6. Open an SFTP channel using openChannel and connect it using connect.
7. Use the get method of the ChannelSftp object to retrieve the remote file and save it locally.

Here's a sample code snippet for SFTP file retrieval using JSch:

JSch jsch = new JSch();
jsch.setKnownHosts("/home/username/.ssh/known_hosts");

Session session = jsch.getSession("remote-username", "remote-host");
session.setPassword("remote-password");
session.connect();

Channel channel = session.openChannel("sftp");
channel.connect();

ChannelSftp sftpChannel = (ChannelSftp) channel;
sftpChannel.get("remote-file", "local-file");

sftpChannel.exit();
session.disconnect();

This code establishes an SSH session, authenticates using a password, opens an SFTP channel, and retrieves the remote file "remote-file" to the local file "local-file".

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