// Example code for enabling authentication and authorization FtpServerFactory serverFactory = new FtpServerFactory(); ListenerFactory listenerFactory = new ListenerFactory(); listenerFactory.setPort(21); serverFactory.addListener("default", listenerFactory.createListener()); UserFactory userFactory = new UserFactory(); userFactory.setName("admin"); userFactory.setPassword("password"); userFactory.setHomeDirectory("/path/to/home"); UserManagerFactory userManagerFactory = new UserManagerFactory(); userManagerFactory.setFile(new File("/path/to/ftp-users.properties")); serverFactory.setUserManager(userManagerFactory.createUserManager()); FtpServer server = serverFactory.createServer(); server.start(); // Example code for enabling SSL/TLS encryption listenerFactory.setImplicitSsl(true); listenerFactory.setSslConfiguration(createSslConfiguration()); // Example code for enabling security logging Properties securityLoggingProperties = new Properties(); securityLoggingProperties.setProperty("log.event.enable", "true"); securityLoggingProperties.setProperty("log.command.enable", "true"); serverFactory.setProperties(securityLoggingProperties); // Example code for limiting connections and transfer rates userFactory.setMaxIdleTime(300); userFactory.setMaxLoginFailures(5); userFactory.setMaxUploadRate(1024); userFactory.setMaxDownloadRate(1024); // Example code for disabling certain FTP commands VirtualFileSystem virtualFileSystem = new VirtualFileSystem(); virtualFileSystem.setDenyCmds("STOR,DELE"); serverFactory.setFileSystem(virtualFileSystem);