apache-commons-net

I'm using Apache Commons FTP to upload a file. Before uploading I want to check if the file already exists on the server and make a backup from it to a backup directory on the same server. Does anyone know how to copy a file from a FTP server to a backup directory on the same server? public static void uploadWithCommonsFTP(File fileToBeUpload){ FTPClient f = new FTPClient(); FTPFile backupDirectory; try { f.connect(server.getServer()); f.login(server.getUsername(), server.getPassword()); FTPFile[] directories = f.listDirectories(); FTPFile[] files = f.listFiles(); for(FTPFile file:directories)

Is there an efficient way to check the existence of a file on a FTP server? I'm using Apache Commons Net. I know that I can use the listNames method of FTPClient to get all the files in a specific directory and then I can go over this list to check if a given file exists, but I don't think it's efficient especially when the server contains a lot of files. listFiles(String pathName) should work just fine for a single file. Using a full path to a file in listFiles (or mlistDir ) call, as the accepted answer shows, should indeed work: String remotePath = "/remote/path/file.txt"; FTPFile[]

Environment: I'm using Sun Java JDK 1.8.0_60 on 64-bit Windows 7, using Spring Integration 4.1.6 (which internally appears to use Apache Commons Net 3.3 for FTPS access). I'm attempting to integrate with our application an automatic download from our client's FTPS server. I've done so successfully with SFTP servers using Spring Integration without any trouble for other clients without issues, but this is the first time a client has required us to use FTPS, and getting it to connect has been very puzzling. While in my real application I'm configuring Spring Integration using XML beans, to try