Java tutorial
/******************************************************************************* * Copyright (c) 2015 Open Software Solutions GmbH. * All rights reserved. This program and the accompanying materials * are made available under the terms of the Apache License v2.0 * which accompanies this distribution, and is available at * * Contributors: * Open Software Solutions GmbH ******************************************************************************/ package org.oss.bonita.utils.ftp; import java.io.ByteArrayInputStream; import java.io.File; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.PrintWriter; import java.util.logging.Logger; import org.apache.commons.net.PrintCommandListener; import org.apache.commons.net.ftp.FTP; import org.apache.commons.net.ftp.FTPClient; import org.apache.commons.net.ftp.FTPFile; import org.apache.commons.net.ftp.FTPReply; public class FtpTransfer { private Logger LOGGER = Logger.getLogger(this.getClass().getName()); private final FTPClient ftp; public FtpTransfer(String host, String user, String pwd) throws IOException { this(host, user, pwd, false); } public FtpTransfer(String host, String user, String pwd, boolean debug) throws IOException { ftp = new FTPClient(); if (debug) { ftp.addProtocolCommandListener(new PrintCommandListener(new PrintWriter(System.out))); } int reply; ftp.connect(host); reply = ftp.getReplyCode(); if (!FTPReply.isPositiveCompletion(reply)) { ftp.disconnect(); throw new IOException("Connection refused: " + ftp.getReplyString()); } if (!ftp.login(user, pwd)) { throw new IOException("Login failed"); } ftp.setFileType(FTP.BINARY_FILE_TYPE); ftp.enterLocalPassiveMode(); LOGGER.finest("FTP Connected to " + host); } public void uploadFile(byte[] fileContent, String fileName, String hostDir) throws IOException { LOGGER.finest("Start uploading " + fileName + " Size: " + fileContent.length + " bytes"); InputStream input = new ByteArrayInputStream(fileContent); ftp.storeFile(hostDir + File.separator + fileName, input); LOGGER.finest("Done uploading " + fileName); } public void uploadFile(File file, String fileName, String hostDir) throws IOException { LOGGER.finest("Start uploading " + fileName); InputStream input = new FileInputStream(file); ftp.storeFile(hostDir + File.separator + fileName, input); LOGGER.finest("Done uploading " + fileName); } public void uploadFile(InputStream input, String fileName, String hostDir) throws IOException { LOGGER.finest("Start uploading " + fileName); ftp.storeFile(hostDir + File.separator + fileName, input); LOGGER.finest("Done uploading " + fileName); } public FTPFile[] listDirectory(String hostDir) throws IOException { ftp.changeWorkingDirectory(hostDir); if (FTPReply.isPositiveCompletion(ftp.getReplyCode())) { return ftp.listFiles(); } throw new IOException("Directory does not exist: " + ftp.getReplyString()); } public void createFolder(String folderName) throws IOException { ftp.makeDirectory(folderName); } public boolean fileExists(FTPFile[] ftpFiles, String fileName) { if (ftpFiles != null && ftpFiles.length > 0) { for (FTPFile file : ftpFiles) { if (file.isFile()) { if (fileName.equals(file.getName())) { return true; } } } } return false; } public boolean folderExists(FTPFile[] ftpFiles, String FolderName) { if (ftpFiles != null && ftpFiles.length > 0) { for (FTPFile file : ftpFiles) { if (!file.isFile()) { if (FolderName.equals(file.getName())) { return true; } } } } return false; } public File downloadToTempFile(String hostDir, String fileName) throws IOException { ftp.changeWorkingDirectory(hostDir); if (FTPReply.isPositiveCompletion(ftp.getReplyCode())) { boolean removeFile = true; File temp = File.createTempFile("ftp", ".data"); FileOutputStream output = new FileOutputStream(temp); try { ftp.retrieveFile(fileName, output); if (FTPReply.isPositiveCompletion(ftp.getReplyCode())) { removeFile = false; return temp; } else { throw new IOException("Unable to download file: " + ftp.getReplyString()); } } finally { output.close(); if (removeFile) { temp.delete(); } } } else { throw new IOException("Directory does not exist: " + ftp.getReplyString()); } } public void deleteFile(String hostDir, String fileName) throws IOException { ftp.changeWorkingDirectory(hostDir); if (FTPReply.isPositiveCompletion(ftp.getReplyCode())) { ftp.deleteFile(fileName); if (!FTPReply.isPositiveCompletion(ftp.getReplyCode())) { throw new IOException("Unable to delete file: " + ftp.getReplyString()); } return; } throw new IOException("Directory does not exist: " + ftp.getReplyString()); } public void disconnect() { if (this.ftp.isConnected()) { try { this.ftp.logout(); this.ftp.disconnect(); LOGGER.finest("FTP Disconnect"); } catch (IOException f) { // do nothing as file is already saved to server } } } }