Java tutorial
//package com.java2s; /* * ################################################################ * * ProActive Parallel Suite(TM): The Java(TM) library for * Parallel, Distributed, Multi-Core Computing for * Enterprise Grids & Clouds * * Copyright (C) 1997-2012 INRIA/University of * Nice-Sophia Antipolis/ActiveEon * Contact: proactive@ow2.org or contact@activeeon.com * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Affero General Public License * as published by the Free Software Foundation; version 3 of * the License. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Affero General Public License for more details. * * You should have received a copy of the GNU Affero General Public License * along with this library; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 * USA * * If needed, contact us to obtain a release under GPL Version 2 or 3 * or a different license than the AGPL. * * Initial developer(s): The ProActive Team * http://proactive.inria.fr/team_members.htm * Contributor(s): * * ################################################################ * $$PROACTIVE_INITIAL_DEV$$ */ import java.io.File; import java.io.FileOutputStream; public class Main { /** * This method allow to append a message to an error file * * @param filename * the error file to write * @param message * the message to append to file */ public static void errorLog(String filename, String message) { try { File file = new File(filename); String path = file.getParent(); if (path != null) { new File(path).mkdirs(); } FileOutputStream fos = new FileOutputStream(file, true); // true->append String time = "" + (new java.sql.Timestamp(System.currentTimeMillis())); message = time + " " + message + "\n"; fos.write(message.getBytes()); fos.close(); } catch (Exception e) { System.err.println("Unable to write file: " + filename); e.printStackTrace(); } } }