Configure the following entry in properties file: -
log4j.appender.R=org.apache.log4j.MyDateRollingFileAppender
Compile the following program in log4j.jar folder and add the same class file to classpath: -
// Compatible with log4j.jar 1.0.4
package org.apache.log4j;
import java.io.File;
import java.io.FilenameFilter;
import java.io.OutputStream;
import java.io.IOException;
import java.io.Writer;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Comparator;
import java.util.Date;
import java.text.SimpleDateFormat;
/**
* Referenced classes of package org.apache.log4j:
*/
/**
* RollingFileAppender, Layout
*/
public class MyDateRollingFileAppender extends RollingFileAppender {
public MyDateRollingFileAppender() {
}
/**
* @deprecated Method MyDateRollingFileAppender is deprecated
*/
public MyDateRollingFileAppender(Layout layout, OutputStream outputstream) {
super(layout, outputstream);
}
/**
* @deprecated Method MyDateRollingFileAppender is deprecated
*/
public MyDateRollingFileAppender(Layout layout, Writer writer) {
super(layout, writer);
}
public MyDateRollingFileAppender(Layout layout, String s, boolean flag)
throws IOException {
super(layout, s, flag);
}
public MyDateRollingFileAppender(Layout layout, String s)
throws IOException {
super(layout, s);
}
/**
* It rollsOver each time after exceeding the MaxFileSize limit by appending
* the current time stamp to the new Log file
*
* @return void
*/
public synchronized void rollOver() { // rollOver() method has been
// overridden for customized
// functionality
try {
if (maxBackupIndex > 0) {
File[] listOfFiles = locateFile(super.fileName);
/**
* checking the condition to delete the oldest/last log file
*/
if ((listOfFiles != null) && (listOfFiles.length > 0)
&& (listOfFiles.length == (maxBackupIndex + 1))) {
File fileToBeDeleted = listOfFiles[listOfFiles.length - 1];
if (fileToBeDeleted.exists()) { // Deletes the Oldest LOG file.
fileToBeDeleted.delete();
}
}
SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy_MM_dd_HH_mm_ss_SSS");
String timeNow = dateFormat.format(new Date());
File oldFile = new File(super.fileName);
File newFile = new File(super.fileName + "." + timeNow);
closeWriterIfOurs();
/**
* checking the condition for renaming the older file prior to
* the new file
*/
if (oldFile.exists()) { // Renames the Current working file from
// store_ext.log to store_ext.log.<TimeStamp>.
oldFile.renameTo(newFile);
}
setFile(super.fileName, false); // Creates the new working file
// for logging purpose.
}
} catch (Exception ex) {
System.out.println(ex.toString());
ex.printStackTrace();
}
}
/**
* locateFile groups the log file and sort based on the descending order of
* timeStamp
*
* @param strFileNameWithPath
* @return fileNames
*/
public File[] locateFile(String strFileNameWithPath) throws Exception {
File extractFile = new File(strFileNameWithPath); // Actual File
final String FILE_NAME = extractFile.getName();
/**
* create a FilenameFilter and override its accept-method
*/
FilenameFilter filefilter = new FilenameFilter() {
public boolean accept(File dirName, String fileName) {
/**
* if the file starts with file name return true, else false
*
*/
return fileName.startsWith(FILE_NAME); // To get list of files
// starts with specific FILE_NAME
}
};
File fileNameWithPath = new File(strFileNameWithPath);
File dirName = fileNameWithPath.getParentFile();
File[] fileNames = null;
if (dirName.isDirectory()) {
/**
* Get the list of files in the directory.
*/
fileNames = dirName.listFiles(filefilter);
/**
* Sort the files in the array, based on filter.
*/
Arrays.sort(fileNames, new Comparator() {
public int compare(final Object o1, final Object o2) {
return new Long(((File) o2).lastModified())
.compareTo(new Long(((File) o1).lastModified()));
}
});
}
return (fileNames);
}
}
log4j.appender.R=org.apache.log4j.MyDateRollingFileAppender
Compile the following program in log4j.jar folder and add the same class file to classpath: -
// Compatible with log4j.jar 1.0.4
package org.apache.log4j;
import java.io.File;
import java.io.FilenameFilter;
import java.io.OutputStream;
import java.io.IOException;
import java.io.Writer;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Comparator;
import java.util.Date;
import java.text.SimpleDateFormat;
/**
* Referenced classes of package org.apache.log4j:
*/
/**
* RollingFileAppender, Layout
*/
public class MyDateRollingFileAppender extends RollingFileAppender {
public MyDateRollingFileAppender() {
}
/**
* @deprecated Method MyDateRollingFileAppender is deprecated
*/
public MyDateRollingFileAppender(Layout layout, OutputStream outputstream) {
super(layout, outputstream);
}
/**
* @deprecated Method MyDateRollingFileAppender is deprecated
*/
public MyDateRollingFileAppender(Layout layout, Writer writer) {
super(layout, writer);
}
public MyDateRollingFileAppender(Layout layout, String s, boolean flag)
throws IOException {
super(layout, s, flag);
}
public MyDateRollingFileAppender(Layout layout, String s)
throws IOException {
super(layout, s);
}
/**
* It rollsOver each time after exceeding the MaxFileSize limit by appending
* the current time stamp to the new Log file
*
* @return void
*/
public synchronized void rollOver() { // rollOver() method has been
// overridden for customized
// functionality
try {
if (maxBackupIndex > 0) {
File[] listOfFiles = locateFile(super.fileName);
/**
* checking the condition to delete the oldest/last log file
*/
if ((listOfFiles != null) && (listOfFiles.length > 0)
&& (listOfFiles.length == (maxBackupIndex + 1))) {
File fileToBeDeleted = listOfFiles[listOfFiles.length - 1];
if (fileToBeDeleted.exists()) { // Deletes the Oldest LOG file.
fileToBeDeleted.delete();
}
}
SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy_MM_dd_HH_mm_ss_SSS");
String timeNow = dateFormat.format(new Date());
File oldFile = new File(super.fileName);
File newFile = new File(super.fileName + "." + timeNow);
closeWriterIfOurs();
/**
* checking the condition for renaming the older file prior to
* the new file
*/
if (oldFile.exists()) { // Renames the Current working file from
// store_ext.log to store_ext.log.<TimeStamp>.
oldFile.renameTo(newFile);
}
setFile(super.fileName, false); // Creates the new working file
// for logging purpose.
}
} catch (Exception ex) {
System.out.println(ex.toString());
ex.printStackTrace();
}
}
/**
* locateFile groups the log file and sort based on the descending order of
* timeStamp
*
* @param strFileNameWithPath
* @return fileNames
*/
public File[] locateFile(String strFileNameWithPath) throws Exception {
File extractFile = new File(strFileNameWithPath); // Actual File
final String FILE_NAME = extractFile.getName();
/**
* create a FilenameFilter and override its accept-method
*/
FilenameFilter filefilter = new FilenameFilter() {
public boolean accept(File dirName, String fileName) {
/**
* if the file starts with file name return true, else false
*
*/
return fileName.startsWith(FILE_NAME); // To get list of files
// starts with specific FILE_NAME
}
};
File fileNameWithPath = new File(strFileNameWithPath);
File dirName = fileNameWithPath.getParentFile();
File[] fileNames = null;
if (dirName.isDirectory()) {
/**
* Get the list of files in the directory.
*/
fileNames = dirName.listFiles(filefilter);
/**
* Sort the files in the array, based on filter.
*/
Arrays.sort(fileNames, new Comparator() {
public int compare(final Object o1, final Object o2) {
return new Long(((File) o2).lastModified())
.compareTo(new Long(((File) o1).lastModified()));
}
});
}
return (fileNames);
}
}
