依据DailyRollingFileAppender和RollingFileAppender改编,支持按日期和文件大小切割日志。
源文件:
- package com.bao.logging;
- import java.io.File;
- import java.io.IOException;
- import java.io.Writer;
- import java.text.SimpleDateFormat;
- import java.util.Calendar;
- import java.util.Date;
- import java.util.GregorianCalendar;
- import java.util.Locale;
- import java.util.TimeZone;
- import org.apache.log4j.FileAppender;
- import org.apache.log4j.Layout;
- import org.apache.log4j.helpers.CountingQuietWriter;
- import org.apache.log4j.helpers.LogLog;
- import org.apache.log4j.helpers.OptionConverter;
- import org.apache.log4j.spi.LoggingEvent;
- /**
- * MyDailyRollingFileAppender extends {@link FileAppender} so that the underlying
- * file is rolled over at a user chosen frequency.
- *
- * <p>
- * The rolling schedule is specified by the <b>DatePattern</b> option. This
- * pattern should follow the {@link SimpleDateFormat} conventions. In
- * particular, you <em>must</em> escape literal text within a pair of single
- * quotes. A formatted version of the date pattern is used as the suffix for the
- * rolled file name.
- *
- * <p>
- * For example, if the <b>File</b> option is set to <code>/foo/bar.log</code>
- * and the <b>DatePattern</b> set to <code>'.'yyyy-MM-dd</code>, on 2001-02-16
- * at midnight, the logging file <code>/foo/bar.log</code> will be copied to
- * <code>/foo/bar.log.2001-02-16</code> and logging for 2001-02-17 will continue
- * in <code>/foo/bar.log</code> until it rolls over the next day.
- *
- * <p>
- * Is is possible to specify monthly, weekly, half-daily, daily, hourly, or
- * minutely rollover schedules.
- *
- * <p>
- * <table border="1" cellpadding="2">
- * <tr>
- * <th>DatePattern</th>
- * <th>Rollover schedule</th>
- * <th>Example</th>
- *
- * <tr>
- * <td><code>'.'yyyy-MM</code>
- * <td>Rollover at the beginning of each month</td>
- *
- * <td>At midnight of May 31st, 2002 <code>/foo/bar.log</code> will be copied to
- * <code>/foo/bar.log.2002-05</code>. Logging for the month of June will be
- * output to <code>/foo/bar.log</code> until it is also rolled over the next
- * month.
- *
- * <tr>
- * <td><code>'.'yyyy-ww</code>
- *
- * <td>Rollover at the first day of each week. The first day of the week depends
- * on the locale.</td>
- *
- * <td>Assuming the first day of the week is Sunday, on Saturday midnight, June
- * 9th 2002, the file <i>/foo/bar.log</i> will be copied to
- * <i>/foo/bar.log.2002-23</i>. Logging for the 24th week of 2002 will be output
- * to <code>/foo/bar.log</code> until it is rolled over the next week.
- *
- * <tr>
- * <td><code>'.'yyyy-MM-dd</code>
- *
- * <td>Rollover at midnight each day.</td>
- *
- * <td>At midnight, on March 8th, 2002, <code>/foo/bar.log</code> will be copied
- * to <code>/foo/bar.log.2002-03-08</code>. Logging for the 9th day of March
- * will be output to <code>/foo/bar.log</code> until it is rolled over the next
- * day.
- *
- * <tr>
- * <td><code>'.'yyyy-MM-dd-a</code>
- *
- * <td>Rollover at midnight and midday of each day.</td>
- *
- * <td>At noon, on March 9th, 2002, <code>/foo/bar.log</code> will be copied to
- * <code>/foo/bar.log.2002-03-09-AM</code>. Logging for the afternoon of the 9th
- * will be output to <code>/foo/bar.log</code> until it is rolled over at
- * midnight.
- *
- * <tr>
- * <td><code>'.'yyyy-MM-dd-HH</code>
- *
- * <td>Rollover at the top of every hour.</td>
- *
- * <td>At approximately 11:00.000 o'clock on March 9th, 2002,
- * <code>/foo/bar.log</code> will be copied to
- * <code>/foo/bar.log.2002-03-09-10</code>. Logging for the 11th hour of the 9th
- * of March will be output to <code>/foo/bar.log</code> until it is rolled over
- * at the beginning of the next hour.
- *
- *
- * <tr>
- * <td><code>'.'yyyy-MM-dd-HH-mm</code>
- *
- * <td>Rollover at the beginning of every minute.</td>
- *
- * <td>At approximately 11:23,000, on March 9th, 2001, <code>/foo/bar.log</code>
- * will be copied to <code>/foo/bar.log.2001-03-09-10-22</code>. Logging for the
- * minute of 11:23 (9th of March) will be output to <code>/foo/bar.log</code>
- * until it is rolled over the next minute.
- *
- * </table>
- *
- * <p>
- * Do not use the colon ":" character in anywhere in the <b>DatePattern</b>
- * option. The text before the colon is interpeted as the protocol specificaion
- * of a URL which is probably not what you want.
- */
- public class MyDailyRollingFileAppender extends FileAppender {
- // The code assumes that the following constants are in a increasing
- // sequence.
- ;
- ;
- ;
- ;
- ;
- ;
- ;
- /**
- * The default maximum file size is 10MB.
- */
- * 1024 * 1024;
- /**
- * There is one backup file by default.
- */
- ;
- /**
- * The date pattern. By default, the pattern is set to "'.'yyyy-MM-dd"
- * meaning daily rollover.
- */
- private String datePattern = "'.'yyyy-MM-dd";
- /**
- * The log file will be renamed to the value of the scheduledFilename
- * variable when the next interval is entered. For example, if the rollover
- * period is one hour, the log file will be renamed to the value of
- * "scheduledFilename" at the beginning of the next hour.
- *
- * The precise time when a rollover occurs depends on logging activity.
- */
- private String scheduledFilename;
- /**
- * The next time we estimate a rollover should occur.
- */
- ;
- Date now = new Date();
- SimpleDateFormat sdf;
- RollingCalendar rc = new RollingCalendar();
- int checkPeriod = TOP_OF_TROUBLE;
- // The gmtTimeZone is used only in computeCheckPeriod() method.
- static final TimeZone gmtTimeZone = TimeZone.getTimeZone("GMT");
- /**
- * The default constructor does nothing.
- */
- public MyDailyRollingFileAppender() {
- }
- /**
- * Instantiate a <code>MyDailyRollingFileAppender</code> and open the file
- * designated by <code>filename</code>. The opened filename will become the
- * ouput destination for this appender.
- */
- public MyDailyRollingFileAppender(Layout layout, String filename,
- String datePattern) throws IOException {
- super(layout, filename, true);
- this.datePattern = datePattern;
- activateOptions();
- }
- /**
- * Get the maximum size that the output file is allowed to reach before
- * being rolled over to backup files.
- *
- * @since 1.1
- */
- public long getMaximumFileSize() {
- return maxFileSize;
- }
- /**
- * Set the maximum size that the output file is allowed to reach before
- * being rolled over to backup files.
- *
- * <p>
- * This method is equivalent to {@link #setMaxFileSize} except that it is
- * required for differentiating the setter taking a <code>long</code>
- * argument from the setter taking a <code>String</code> argument by the
- * JavaBeans {@link java.beans.Introspector Introspector}.
- *
- * @see #setMaxFileSize(String)
- */
- public void setMaximumFileSize(long maxFileSize) {
- this.maxFileSize = maxFileSize;
- }
- /**
- * Set the maximum size that the output file is allowed to reach before
- * being rolled over to backup files.
- *
- * <p>
- * In configuration files, the <b>MaxFileSize</b> option takes an long
- * integer in the range 0 - 2^63. You can specify the value with the
- * suffixes "KB", "MB" or "GB" so that the integer is interpreted being
- * expressed respectively in kilobytes, megabytes or gigabytes. For example,
- * the value "10KB" will be interpreted as 10240.
- */
- public void setMaxFileSize(String value) {
- );
- }
- /**
- * Returns the value of the <b>MaxBackupIndex</b> option.
- */
- public int getMaxBackupIndex() {
- return maxBackupIndex;
- }
- /**
- * Set the maximum number of backup files to keep around.
- *
- * <p>
- * The <b>MaxBackupIndex</b> option determines how many backup files are
- * kept before the oldest is erased. This option takes a positive integer
- * value. If set to zero, then there will be no backup files and the log
- * file will be truncated when it reaches <code>MaxFileSize</code>.
- */
- public void setMaxBackupIndex(int maxBackups) {
- this.maxBackupIndex = maxBackups;
- }
- /**
- * The <b>DatePattern</b> takes a string in the same format as expected by
- * {@link SimpleDateFormat}. This options determines the rollover schedule.
- */
- public void setDatePattern(String pattern) {
- datePattern = pattern;
- }
- /** Returns the value of the <b>DatePattern</b> option. */
- public String getDatePattern() {
- return datePattern;
- }
- public void activateOptions() {
- super.activateOptions();
- if (datePattern != null && fileName != null) {
- now.setTime(System.currentTimeMillis());
- sdf = new SimpleDateFormat(datePattern);
- int type = computeCheckPeriod();
- printPeriodicity(type);
- rc.setType(type);
- File file = new File(fileName);
- scheduledFilename = fileName
- + sdf.format(new Date(file.lastModified()));
- } else {
- LogLog.error("Either File or DatePattern options are not set for appender ["
- + name + "].");
- }
- }
- void printPeriodicity(int type) {
- switch (type) {
- case TOP_OF_MINUTE:
- LogLog.debug("Appender [" + name + "] to be rolled every minute.");
- break;
- case TOP_OF_HOUR:
- LogLog.debug("Appender [" + name
- + "] to be rolled on top of every hour.");
- break;
- case HALF_DAY:
- LogLog.debug("Appender [" + name
- + "] to be rolled at midday and midnight.");
- break;
- case TOP_OF_DAY:
- LogLog.debug("Appender [" + name + "] to be rolled at midnight.");
- break;
- case TOP_OF_WEEK:
- LogLog.debug("Appender [" + name
- + "] to be rolled at start of week.");
- break;
- case TOP_OF_MONTH:
- LogLog.debug("Appender [" + name
- + "] to be rolled at start of every month.");
- break;
- default:
- LogLog.warn("Unknown periodicity for appender [" + name + "].");
- }
- }
- // This method computes the roll over period by looping over the
- // periods, starting with the shortest, and stopping when the r0 is
- // different from from r1, where r0 is the epoch formatted according
- // the datePattern (supplied by the user) and r1 is the
- // epoch+nextMillis(i) formatted according to datePattern. All date
- // formatting is done in GMT and not local format because the test
- // logic is based on comparisons relative to 1970-01-01 00:00:00
- // GMT (the epoch).
- int computeCheckPeriod() {
- RollingCalendar rollingCalendar = new RollingCalendar(gmtTimeZone,
- Locale.ENGLISH);
- // set sate to 1970-01-01 00:00:00 GMT
- );
- if (datePattern != null) {
- for (int i = TOP_OF_MINUTE; i <= TOP_OF_MONTH; i++) {
- SimpleDateFormat simpleDateFormat = new SimpleDateFormat(
- datePattern);
- simpleDateFormat.setTimeZone(gmtTimeZone); // do all date
- // formatting in GMT
- String r0 = simpleDateFormat.format(epoch);
- rollingCalendar.setType(i);
- Date next = new Date(rollingCalendar.getNextCheckMillis(epoch));
- String r1 = simpleDateFormat.format(next);
- // System.out.println("Type = "+i+", r0 = "+r0+", r1 = "+r1);
- if (r0 != null && r1 != null && !r0.equals(r1)) {
- return i;
- }
- }
- }
- return TOP_OF_TROUBLE; // Deliberately head for trouble...
- }
- /**
- * Implements the usual roll over behaviour.
- *
- * <p>
- * If <code>MaxBackupIndex</code> is positive, then files {
- * <code>File.1</code>, ..., <code>File.MaxBackupIndex -1</code> are renamed
- * to {<code>File.2</code>, ..., <code>File.MaxBackupIndex</code> .
- * Moreover, <code>File</code> is renamed <code>File.1</code> and closed. A
- * new <code>File</code> is created to receive further log output.
- *
- * <p>
- * If <code>MaxBackupIndex</code> is equal to zero, then the
- * <code>File</code> is truncated with no backup files created.
- */
- public// synchronization not necessary since doAppend is alreasy synched
- void sizeRollOver() {
- File target;
- File file;
- LogLog.debug("rolling over count="
- + ((CountingQuietWriter) qw).getCount());
- LogLog.debug("maxBackupIndex=" + maxBackupIndex);
- String datedFilename = fileName + sdf.format(now);
- ) {
- // Delete the oldest file, to keep Windows happy.
- file = new File(datedFilename + '.' + maxBackupIndex);
- if (file.exists())
- file.delete();
- // Map {(maxBackupIndex - 1), ..., 2, 1} to {maxBackupIndex, ..., 3,
- // 2}
- ; i >= 1; i--) {
- file = new File(datedFilename + "." + i);
- if (file.exists()) {
- ));
- LogLog.debug("Renaming file " + file + " to " + target);
- file.renameTo(target);
- }
- }
- // Rename fileName to datedFilename.1
- );
- this.closeFile(); // keep windows happy.
- file = new File(fileName);
- LogLog.debug("Renaming file " + file + " to " + target);
- file.renameTo(target);
- ){//infinite number of files
- //find the max backup index
- ; i < Integer.MAX_VALUE; i++) {
- target = new File(datedFilename + "." + i);
- if (! target.exists()) {//Rename fileName to datedFilename.i
- this.closeFile();
- file = new File(fileName);
- file.renameTo(target);
- LogLog.debug("Renaming file " + file + " to " + target);
- break;
- }
- }
- }
- try {
- // This will also close the file. This is OK since multiple
- // close operations are safe.
- this.setFile(fileName, false, bufferedIO, bufferSize);
- } catch (IOException e) {
- LogLog.error("setFile(" + fileName + ", false) call failed.", e);
- }
- scheduledFilename = datedFilename;
- }
- public synchronized void setFile(String fileName, boolean append,
- boolean bufferedIO, int bufferSize) throws IOException {
- super.setFile(fileName, append, this.bufferedIO, this.bufferSize);
- if (append) {
- File f = new File(fileName);
- ((CountingQuietWriter) qw).setCount(f.length());
- }
- }
- protected void setQWForFiles(Writer writer) {
- this.qw = new CountingQuietWriter(writer, errorHandler);
- }
- /**
- * Rollover the current file to a new file.
- */
- void timeRollOver() throws IOException {
- /* Compute filename, but only if datePattern is specified */
- if (datePattern == null) {
- errorHandler.error("Missing DatePattern option in rollOver().");
- return;
- }
- String datedFilename = fileName + sdf.format(now);
- // It is too early to roll over because we are still within the
- // bounds of the current interval. Rollover will occur once the
- // next interval is reached.
- if (scheduledFilename.equals(datedFilename)) {
- return;
- }
- // close current file, and rename it to datedFilename
- this.closeFile();
- File target = new File(scheduledFilename);
- if (target.exists()) {
- target.delete();
- }
- File file = new File(fileName);
- boolean result = file.renameTo(target);
- if (result) {
- LogLog.debug(fileName + " -> " + scheduledFilename);
- } else {
- LogLog.error("Failed to rename [" + fileName + "] to ["
- + scheduledFilename + "].");
- }
- try {
- // This will also close the file. This is OK since multiple
- // close operations are safe.
- super.setFile(fileName, false, this.bufferedIO, this.bufferSize);
- } catch (IOException e) {
- errorHandler.error("setFile(" + fileName + ", false) call failed.");
- }
- scheduledFilename = datedFilename;
- }
- /**
- * This method differentiates MyDailyRollingFileAppender from its super class.
- *
- * <p>
- * Before actually logging, this method will check whether it is time to do
- * a rollover. If it is, it will schedule the next rollover time and then
- * rollover.
- * */
- protected void subAppend(LoggingEvent event) {
- long n = System.currentTimeMillis();
- if (n >= nextCheck) {
- now.setTime(n);
- nextCheck = rc.getNextCheckMillis(now);
- try {
- timeRollOver();
- } catch (IOException ioe) {
- LogLog.error("rollOver() failed.", ioe);
- }
- } else if ((fileName != null)
- && ((CountingQuietWriter) qw).getCount() >= maxFileSize) {
- sizeRollOver();
- }
- super.subAppend(event);
- }
- }
- /**
- * RollingCalendar is a helper class to MyDailyRollingFileAppender. Given a
- * periodicity type and the current time, it computes the start of the next
- * interval.
- * */
- class RollingCalendar extends GregorianCalendar {
- int type = MyDailyRollingFileAppender.TOP_OF_TROUBLE;
- RollingCalendar() {
- super();
- }
- RollingCalendar(TimeZone tz, Locale locale) {
- super(tz, locale);
- }
- void setType(int type) {
- this.type = type;
- }
- public long getNextCheckMillis(Date now) {
- return getNextCheckDate(now).getTime();
- }
- public Date getNextCheckDate(Date now) {
- this.setTime(now);
- switch (type) {
- case MyDailyRollingFileAppender.TOP_OF_MINUTE:
- );
- );
- );
- break;
- case MyDailyRollingFileAppender.TOP_OF_HOUR:
- );
- );
- );
- );
- break;
- case MyDailyRollingFileAppender.HALF_DAY:
- );
- );
- );
- int hour = get(Calendar.HOUR_OF_DAY);
- ) {
- );
- } else {
- );
- );
- }
- break;
- case MyDailyRollingFileAppender.TOP_OF_DAY:
- );
- );
- );
- );
- );
- break;
- case MyDailyRollingFileAppender.TOP_OF_WEEK:
- this.set(Calendar.DAY_OF_WEEK, getFirstDayOfWeek());
- );
- );
- );
- );
- break;
- case MyDailyRollingFileAppender.TOP_OF_MONTH:
- );
- );
- );
- );
- );
- break;
- default:
- throw new IllegalStateException("Unknown periodicity type.");
- }
- return getTime();
- }
- }
使用方法:
- <appender name="PROJECT" class="com.bao.logging.MyDailyRollingFileAppender">
- <param name="file" value="e:/test.log"/>
- <param name="DatePattern" value="'.'yyyy-MM-dd'.log'" />
- <param name="append" value="true"/>
- <param name="MaxFileSize" value="500MB"/>
- <param name="MaxBackupIndex" value="20"/>
- <!-- <param name="MaxBackupIndex" value="-1"/> --><!-- 无限的文件数量,index顺序按时间顺序递增 -->
- <param name="encoding" value="UTF-8"/>
- <param name="threshold" value="info"/>
- <layout class="org.apache.log4j.PatternLayout">
- <param name="ConversionPattern" value="[%d{dd HH:mm:ss,SSS\} %-5p] [%t] %c{2\} - %m%n"/>
- </layout>
- </appender>