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SFTP in Java

Thursday, November 27th, 2008

Introduction

This demonstrates how Java clients can connect to SFTP servers to transfer files, using  edtFTPj/PRO.

Detail

SFTP is a protocol for transferring files securely via the SSH protocol. File transfer commands are implemented on top of SSH. For Java clients to communicate to SFTP servers, the client side of the SFTP protocol and SSH must be implemented in Java.

It is not realistic for most applications to directly implement the SFTP protocol. Instead, it is best to acquire an implementation that is well tested and feature rich - for example, edtFTPj/PRO. The following example demonstrates how a client using edtFTPj/PRO can connect to an SFTP server and list the current directory on the server. It downloads every file in the directory:

import com.enterprisedt.net.ftp.*;
 
SecureFileTransferClient client = new SecureFileTransferClient();
 
// set params
client.setRemoteHost(host);
client.setUserName(username);
client.setPassword(password);
client.setProtocol(Protocol.SFTP);
 
client.connect();
 
// get a directory listing
FTPFile[] files = client.directoryList();
for (int i = 0; i < files.length; i++) {
   System.out.println(files[i].toString());
   client.downloadFile(files[i].getName(), files[i].getName());
}
 
client.disconnect();

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FTPS in Java

Thursday, November 27th, 2008

Introduction

This demonstrates how Java clients can connect to FTPS servers to transfer files, using  edtFTPj/PRO.

Detail

FTPS is a protocol for transferring files securely via FTP. Basically, the standard FTP protocol is encrypted via secure sockets, or SSL. For Java clients to communicate to FTPS servers, the client side of the FTP protocol and SSL must be implemented in Java.

It is not realistic for most applications to directly implement the FTPS protocol. Instead, it is best to acquire an implementation that is well tested and feature rich - for example, edtFTPj/PRO. The following example demonstrates how a client using edtFTPj/PRO can connect to an FTPS server and list the current directory on the server. It downloads every file in the directory:

import com.enterprisedt.net.ftp.*;
 
SecureFileTransferClient client = new SecureFileTransferClient();
 
// set params
client.setRemoteHost(host);
client.setUserName(username);
client.setPassword(password);
client.setProtocol(Protocol.FTPS_EXPLICIT);
 
client.connect();
 
// get a directory listing
FTPFile[] files = client.directoryList();
for (int i = 0; i < files.length; i++) {
   System.out.println(files[i].toString());
   client.downloadFile(files[i].getName(), files[i].getName());
}
 
client.disconnect();

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Posted in Tutorials | No Comments »