SFTP file transfer using Java JSch

Question

Here is my code, which retrieves content of the file, on the remote server and display as output.

package sshexample;  import com.jcraft.jsch.*; import java.io.*;  public class SSHexample  { public static void main(String[] args)  {     String user = "user";     String password = "password";     String host = "192.168.100.103";     int port=22;      String remoteFile="sample.txt";      try     {         JSch jsch = new JSch();         Session session = jsch.getSession(user, host, port);         session.setPassword(password);         session.setConfig("StrictHostKeyChecking", "no");         System.out.println("Establishing Connection...");         session.connect();         System.out.println("Connection established.");         System.out.println("Creating SFTP Channel.");         ChannelSftp sftpChannel = (ChannelSftp) session.openChannel("sftp");         sftpChannel.connect();         System.out.println("SFTP Channel created.");         InputStream out= null;         out= sftpChannel.get(remoteFile);         BufferedReader br = new BufferedReader(new InputStreamReader(out));         String line;         while ((line = br.readLine()) != null)          {             System.out.println(line);         }         br.close();         sftpChannel.disconnect();         session.disconnect();     }     catch(JSchException | SftpException | IOException e)     {         System.out.println(e);     } } } 

Now how to implement this program that the file is copied in the localhost and how to copy a file from localhost to the server.

Here how to make work the transfer of files for any format of files.

Answer 1

The most trivial way to upload a file over SFTP with JSch is:

JSch jsch = new JSch(); Session session = jsch.getSession(user, host); session.setPassword(password); session.connect();  ChannelSftp sftpChannel = (ChannelSftp) session.openChannel("sftp"); sftpChannel.connect();  sftpChannel.put("C:/source/local/path/file.zip", "/target/remote/path/file.zip"); 

Similarly for a download:

sftpChannel.get("/source/remote/path/file.zip", "C:/target/local/path/file.zip"); 

---

You may need to deal with UnknownHostKey exception.