Java tutorial
/* ************************************************************************ ******************* CANADIAN ASTRONOMY DATA CENTRE ******************* ************** CENTRE CANADIEN DE DONNES ASTRONOMIQUES ************** * * (c) 2016. (c) 2016. * Government of Canada Gouvernement du Canada * National Research Council Conseil national de recherches * Ottawa, Canada, K1A 0R6 Ottawa, Canada, K1A 0R6 * All rights reserved Tous droits rservs * * NRC disclaims any warranties, Le CNRC dnie toute garantie * expressed, implied, or nonce, implicite ou lgale, * statutory, of any kind with de quelque nature que ce * respect to the software, soit, concernant le logiciel, * including without limitation y compris sans restriction * any warranty of merchantability toute garantie de valeur * or fitness for a particular marchande ou de pertinence * purpose. NRC shall not be pour un usage particulier. * liable in any event for any Le CNRC ne pourra en aucun cas * damages, whether direct or tre tenu responsable de tout * indirect, special or general, dommage, direct ou indirect, * consequential or incidental, particulier ou gnral, * arising from the use of the accessoire ou fortuit, rsultant * software. Neither the name de l'utilisation du logiciel. Ni * of the National Research le nom du Conseil National de * Council of Canada nor the Recherches du Canada ni les noms * names of its contributors may de ses participants ne peuvent * be used to endorse or promote tre utiliss pour approuver ou * products derived from this promouvoir les produits drivs * software without specific prior de ce logiciel sans autorisation * written permission. pralable et particulire * par crit. * * This file is part of the Ce fichier fait partie du projet * OpenCADC project. OpenCADC. * * OpenCADC is free software: OpenCADC est un logiciel libre ; * you can redistribute it and/or vous pouvez le redistribuer ou le * modify it under the terms of modifier suivant les termes de * the GNU Affero General Public la GNU Affero General Public * License as published by the License? telle que publie * Free Software Foundation, par la Free Software Foundation * either version 3 of the : soit la version 3 de cette * License, or (at your option) licence, soit ( votre gr) * any later version. toute version ultrieure. * * OpenCADC is distributed in the OpenCADC est distribu * hope that it will be useful, dans lespoir quil vous * but WITHOUT ANY WARRANTY; sera utile, mais SANS AUCUNE * without even the implied GARANTIE : sans mme la garantie * warranty of MERCHANTABILITY implicite de COMMERCIALISABILIT * or FITNESS FOR A PARTICULAR ni dADQUATION UN OBJECTIF * PURPOSE. See the GNU Affero PARTICULIER. Consultez la Licence * General Public License for Gnrale Publique GNU Affero * more details. pour plus de dtails. * * You should have received Vous devriez avoir reu une * a copy of the GNU Affero copie de la Licence Gnrale * General Public License along Publique GNU Affero avec * with OpenCADC. If not, see OpenCADC ; si ce nest * <http://www.gnu.org/licenses/>. pas le cas, consultez : * <http://www.gnu.org/licenses/>. * * ************************************************************************ */ package ca.nrc.cadc.web; import ca.nrc.cadc.net.OutputStreamWrapper; import org.apache.commons.net.ftp.FTP; import org.apache.commons.net.ftp.FTPClient; import org.apache.commons.net.ftp.FTPReply; import java.io.IOException; import java.io.OutputStream; import java.security.AccessControlException; public class ServerToServerFTPTransfer { // username and password. private static final String CREDENTIAL = "WEBTMP"; private final String hostname; private final int port; public ServerToServerFTPTransfer(final String host, final int port) { this.hostname = host; this.port = port; } public void send(final OutputStreamWrapper outputStreamWrapper, final String filename) throws IOException { final FTPClient ftpClient = connect(); ftpClient.setFileType(FTP.ASCII_FILE_TYPE); ftpClient.enterLocalPassiveMode(); try { final OutputStream outputStream = ftpClient.storeFileStream(filename); outputStreamWrapper.write(outputStream); outputStream.flush(); outputStream.close(); } finally { if (ftpClient.isConnected()) { try { ftpClient.disconnect(); } catch (IOException f) { // do nothing } } } } private FTPClient connect() throws IOException { final FTPClient ftpClient = createFTPClient(); ftpClient.connect(hostname, port); final int reply = ftpClient.getReplyCode(); if (!FTPReply.isPositiveCompletion(reply)) { ftpClient.disconnect(); throw new IOException(String.format("FTP Connection failed with error code %d.", reply)); } else { return login(ftpClient); } } /** * * @param ftpClient The Connected client. * @return The mutated client, now authenticated. * @throws AccessControlException If login fails. */ private FTPClient login(final FTPClient ftpClient) throws AccessControlException, IOException { if (!ftpClient.login(CREDENTIAL, CREDENTIAL)) { ftpClient.logout(); throw new AccessControlException(String.format("Login failed for %s", CREDENTIAL)); } else { return ftpClient; } } /** * Override me to for testing. * @return FTPClient instance. */ FTPClient createFTPClient() { return new FTPClient(); } }