He creado una appender que va a hacer eso. http://stauffer.james.googlepages.com/DateFormatFileAppender.java
/*
* 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);
}
}
}
}
}
¿Esto no basta con crear un archivo de registro denominado "application.log" y sólo colocar el DatePattern en los archivos de registro laminados? – Tim
Como resultado, obtendrá un archivo de registro por separado para cada día. Pero el archivo de registro de hoy se llamará application.log, sin fecha. Y está bien en la mayoría de los casos. – gedevan
Dos comentarios sobre "DatePattern": - Uso ".yyyy-MM-dd.Lo \ g" para conseguir la misma extensión para todos los archivos de registro -. Se necesita la barra invertida antes de g (al menos para log4net) para evitar la aplicación de la .Net predefinido 'formato g' – gyrolf