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copied!<p>I have created an appender that will do that. <a href="http://stauffer.james.googlepages.com/DateFormatFileAppender.java" rel="noreferrer">http://stauffer.james.googlepages.com/DateFormatFileAppender.java</a></p> <pre><code>/* * Copyright (C) The Apache Software Foundation. All rights reserved. * * This software is published under the terms of the Apache Software * License version 1.1, a copy of which has been included with this * distribution in the LICENSE.txt file. */ package sps.log.log4j; import java.io.IOException; import java.io.File; import java.text.SimpleDateFormat; import java.util.Date; import org.apache.log4j.*; import org.apache.log4j.helpers.LogLog; import org.apache.log4j.spi.LoggingEvent; /** * DateFormatFileAppender is a log4j Appender and extends * {@link FileAppender} so each log is * named based on a date format defined in the File property. * * Sample File: 'logs/'yyyy/MM-MMM/dd-EEE/HH-mm-ss-S'.log' * Makes a file like: logs/2004/04-Apr/13-Tue/09-45-15-937.log * @author James Stauffer */ public class DateFormatFileAppender extends FileAppender { /** * The default constructor does nothing. */ public DateFormatFileAppender() { } /** * Instantiate a <code>DailyRollingFileAppender</code> and open the * file designated by <code>filename</code>. The opened filename will * become the ouput destination for this appender. */ public DateFormatFileAppender (Layout layout, String filename) throws IOException { super(layout, filename, true); } private String fileBackup;//Saves the file pattern private boolean separate = false; public void setFile(String file) { super.setFile(file); this.fileBackup = getFile(); } /** * If true each LoggingEvent causes that file to close and open. * This is useful when the file is a pattern that would often * produce a different filename. */ public void setSeparate(boolean separate) { this.separate = separate; } protected void subAppend(LoggingEvent event) { if(separate) { try {//First reset the file so each new log gets a new file. setFile(getFile(), getAppend(), getBufferedIO(), getBufferSize()); } catch(IOException e) { LogLog.error("Unable to reset fileName."); } } super.subAppend(event); } public synchronized void setFile(String fileName, boolean append, boolean bufferedIO, int bufferSize) throws IOException { SimpleDateFormat sdf = new SimpleDateFormat(fileBackup); String actualFileName = sdf.format(new Date()); makeDirs(actualFileName); super.setFile(actualFileName, append, bufferedIO, bufferSize); } /** * Ensures that all of the directories for the given path exist. * Anything after the last / or \ is assumed to be a filename. */ private void makeDirs (String path) { int indexSlash = path.lastIndexOf("/"); int indexBackSlash = path.lastIndexOf("\\"); int index = Math.max(indexSlash, indexBackSlash); if(index > 0) { String dirs = path.substring(0, index); // LogLog.debug("Making " + dirs); File dir = new File(dirs); if(!dir.exists()) { boolean success = dir.mkdirs(); if(!success) { LogLog.error("Unable to create directories for " + dirs); } } } } } </code></pre>

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