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  • 删除N天前的log4j日志的方法

    这个方式是采用的RollingFileAppender, 然后通过设置maxBackupIndex属性来指定要保留的日志的最大值(这里采用一天一个日志).但是我们一直采用的是 DailyRollingFileAppender. 可是该appender没有maxBackupIndex这个属性, 于是又google了一把, 发现老外也想到的解决办法, 而且这里有两个解决方法, 即在RollingFileAppender的基础上, 加入了maxBackupIndex属性.

    /**************************
    * Zybocodes *******************************
    * Code For :
    * log4j custom DailyRollingFileAppender - manage your
    * logs:maxBackupIndex zip roll archive logging log management
    * logs
    * Contributor : Ed Sarrazin
    * Ref link : http://jconvert.sourceforge.net
    * For this and other codes/logic under any technology visit:
    * http://www.zybonics.com/zybocodes/
    ********************************************************************/

    /*
    * Licensed to the Apache Software Foundation (ASF) under one or more
    * contributor license agreements. See the NOTICE file distributed with
    * this work for additional information regarding copyright ownership.
    * The ASF licenses this file to You under the Apache License, Version 2.0
    * (the "License"); you may not use this file except in compliance with
    * the License. You may obtain a copy of the License at
    * http://www.apache.org/licenses/LICENSE-2.0
    * Unless required by applicable law or agreed to in writing, software
    * distributed under the License is distributed on an "AS IS" BASIS,
    * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    * See the License for the specific language governing permissions and
    * limitations under the License.
    */
    package logger;

    import java.io.File;
    import java.io.FileFilter;
    import java.io.FileInputStream;
    import java.io.FileOutputStream;
    import java.io.IOException;
    import java.io.InputStream;
    import java.io.InterruptedIOException;
    import java.text.ParseException;
    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 java.util.zip.ZipEntry;
    import java.util.zip.ZipInputStream;
    import java.util.zip.ZipOutputStream;

    import org.apache.log4j.FileAppender;
    import org.apache.log4j.Layout;
    import org.apache.log4j.helpers.LogLog;
    import org.apache.log4j.spi.LoggingEvent;

    /**
    * @author Ed Sarrazin
    *  <pre>
    *  AdvancedDailyRollingFileAppender is a copy of apaches DailyRollingFileAppender.  This copy was made because it could not be extended due to package level access.  This new version will allow two new properties to be set:
    *  MaxNumberOfDays:            Max number of log files to keep, denoted in days.  If using compression, this days should be longer than
    *  -                           CompressBackupsAfterDays and will become irrelevant as files will be moved to archive before this time.
    *  CompressBackups:            Indicating if older log files should be backed up to a compressed format.
    *  RollCompressedBackups:      TURE/FALSE indicating that compressed backups should be rolled out (deleted after certain age)
    *  CompressBackupsAfterDays:   Number of days to wait until adding files to compressed backup. (Files that are compressed are deleted)
    *  CompressBackupsDatePattern: example - "'.'yyyy-MM" - this will create compressed backups grouped by pattern.  In this example, every month
    *  CompressMaxNumberDays:      Number of days to keep compressed backups.  RollCompressedBackups must be true.
    *
    *  Here is a listing of the log4j.properties file you would use:
    *
    *  log4j.appender.RootAppender=com.edsdev.log4j.AdvancedDailyRollingFileAppender
    *  log4j.appender.RootAppender.DatePattern='.'yyyyMMdd
    *  log4j.appender.RootAppender.MaxNumberOfDays=60
    *  log4j.appender.RootAppender.CompressBackups=true
    *  log4j.appender.RootAppender.CompressBackupsAfterDays=31
    *  log4j.appender.RootAppender.CompressBackupsDatePattern='.'yyyyMM
    *  log4j.appender.RootAppender.RollCompressedBackups=true
    *  log4j.appender.RootAppender.CompressMaxNumberDays=365
    *
    *  </pre>
    * AdvancedDailyRollingFileAppender extends {@link FileAppender} so that the underlying file is rolled over at a user
    * chosen frequency. AdvancedDailyRollingFileAppender has been observed to exhibit synchronization issues and data loss.
    * The log4j extras companion includes alternatives which should be considered for new deployments and which are
    * discussed in the documentation for org.apache.log4j.rolling.RollingFileAppender.
    * <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.
    * @author Eirik Lygre
    * @author Ceki Gülcü
    */
    public class AdvancedDailyRollingFileAppender extends FileAppender {

        // The code assumes that the following constants are in a increasing
        // sequence.
        static final int TOP_OF_TROUBLE = -1;
        static final int TOP_OF_MINUTE = 0;
        static final int TOP_OF_HOUR = 1;
        static final int HALF_DAY = 2;
        static final int TOP_OF_DAY = 3;
        static final int TOP_OF_WEEK = 4;
        static final int TOP_OF_MONTH = 5;

        /** Indicates if log files should be moved to archive file */
        private String compressBackups = "false";
        /** Indicates if archive file that may be created will be rolled off as it ages */
        private String rollCompressedBackups = "false";
        /** Maximum number of days to keep log files */
        private int maxNumberOfDays = 31;
        /** Number of days to wait before moving a log file to an archive */
        private int compressBackupsAfterDays = 31;
        /** Pattern used to name archive file (also controls what log files are grouped together */
        private String compressBackupsDatePattern = "'.'yyyy-MM";
        /** Maximum number of days to keep archive file before deleting */
        private int compressMaxNumberDays = 365;

        /**
         * 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.
         */
        private long nextCheck = System.currentTimeMillis() - 1;

        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 AdvancedDailyRollingFileAppender() {
        }

        /**
         * Instantiate a <code>AdvancedDailyRollingFileAppender</code> and open the file designated by
         * <code>filename</code>. The opened filename will become the ouput destination for this appender.
         */
        public AdvancedDailyRollingFileAppender(Layout layout, String filename, String datePattern) throws IOException {
            super(layout, filename, true);
            this.datePattern = datePattern;
            activateOptions();
        }

        /**
         * 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 String getCompressBackups() {
            return compressBackups;
        }

        public void setCompressBackups(String compressBackups) {
            this.compressBackups = compressBackups;
        }

        public String getMaxNumberOfDays() {
            return "" + maxNumberOfDays;
        }

        public void setMaxNumberOfDays(String days) {
            try {
                this.maxNumberOfDays = Integer.parseInt(days);
            } catch (Exception e) {
                // just leave it at default
            }

        }

        @Override
        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.getDefault());
            // set sate to 1970-01-01 00:00:00 GMT
            Date epoch = new Date(0);
            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...
        }

        /**
         * Rollover the current file to a new file.
         */
        void rollOver() 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.
                this.setFile(fileName, true, this.bufferedIO, this.bufferSize);
            } catch (IOException e) {
                errorHandler.error("setFile(" + fileName + ", true) call failed.");
            }
            scheduledFilename = datedFilename;
        }

        /**
         * This method differentiates AdvancedDailyRollingFileAppender 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.
         */
        @Override
        protected void subAppend(LoggingEvent event) {
            long n = System.currentTimeMillis();
            if (n >= nextCheck) {
                now.setTime(n);
                nextCheck = rc.getNextCheckMillis(now);
                try {
                    cleanupAndRollOver();
                } catch (IOException ioe) {
                    if (ioe instanceof InterruptedIOException) {
                        Thread.currentThread().interrupt();
                    }
                    LogLog.error("cleanupAndRollover() failed.", ioe);
                }
            }
            super.subAppend(event);
        }

        /*
         * This method checks to see if we're exceeding the number of log backups
         * that we are supposed to keep, and if so,
         * deletes the offending files. It then delegates to the rollover method to
         * rollover to a new file if required.
         */
        protected void cleanupAndRollOver() throws IOException {
            File file = new File(fileName);
            Calendar cal = Calendar.getInstance();

            cal.add(Calendar.DATE, -maxNumberOfDays);
            Date cutoffDate = cal.getTime();

            cal = Calendar.getInstance();
            cal.add(Calendar.DATE, -compressBackupsAfterDays);
            Date cutoffZip = cal.getTime();

            cal = Calendar.getInstance();
            cal.add(Calendar.DATE, -compressMaxNumberDays);
            Date cutoffDelZip = cal.getTime();

            if (file.getParentFile().exists()) {
                File[] files = file.getParentFile().listFiles(new StartsWithFileFilter(file.getName(), false));
                int nameLength = file.getName().length();
                for (int i = 0; i < files.length; i++) {
                    String datePart = null;
                    try {
                        datePart = files[i].getName().substring(nameLength);
                        Date date = sdf.parse(datePart);
                        // cutoffDate for deletion should be further back than
                        // cutoff for backup
                        if (date.before(cutoffDate)) {
                            files[i].delete();
                        } else if (getCompressBackups().equalsIgnoreCase("YES")
                                || getCompressBackups().equalsIgnoreCase("TRUE")) {
                            if (date.before(cutoffZip)) {
                                zipAndDelete(files[i], cutoffZip);
                            }
                        }
                    } catch (ParseException pe) {
                        // Ignore - bad parse format, not a log file, current log
                        // file, or bad format on log file
                    } catch (Exception e) {
                        LogLog.warn("Failed to process file " + files[i].getName(), e);
                    }
                    try {
                        if ((getRollCompressedBackups().equalsIgnoreCase("YES") || getRollCompressedBackups()
                                .equalsIgnoreCase("TRUE"))
                                && files[i].getName().endsWith(".zip")) {
                            datePart = files[i].getName().substring(nameLength, files[i].getName().length() - 4);
                            Date date = new SimpleDateFormat(compressBackupsDatePattern).parse(datePart);
                            if (date.before(cutoffDelZip)) {
                                files[i].delete();
                            }
                        }
                    } catch (ParseException e) {
                        // Ignore - parse exceptions mean that format is wrong or
                        // there are other files in this dir
                    } catch (Exception e) {
                        LogLog.warn("Evaluating archive file for rolling failed: " + files[i].getName(), e);
                    }
                }
            }
            rollOver();
        }

        /**
         * Compresses the passed file to a .zip file, stores the .zip in the same directory as the passed file, and then
         * deletes the original, leaving only the .zipped archive.
         * @param file
         */
        private void zipAndDelete(File file, Date cutoffZip) throws IOException {
            if (!file.getName().endsWith(".zip")) {
                String rootLogFileName = new File(fileName).getName();
                String datePart = file.getName().substring(rootLogFileName.length());
                String fileRoot = file.getName().substring(0, file.getName().indexOf(datePart));
                SimpleDateFormat sdf = new SimpleDateFormat(getCompressBackupsDatePattern());
                String newFile = fileRoot + sdf.format(cutoffZip);
                File zipFile = new File(file.getParent(), newFile + ".zip");

                if (zipFile.exists()) {
                    addFilesToExistingZip(zipFile, new File[] { file });
                } else {

                    FileInputStream fis = new FileInputStream(file);
                    FileOutputStream fos = new FileOutputStream(zipFile);
                    ZipOutputStream zos = new ZipOutputStream(fos);
                    ZipEntry zipEntry = new ZipEntry(file.getName());
                    zos.putNextEntry(zipEntry);

                    byte[] buffer = new byte[4096];
                    while (true) {
                        int bytesRead = fis.read(buffer);
                        if (bytesRead == -1)
                            break;
                        else {
                            zos.write(buffer, 0, bytesRead);
                        }
                    }
                    zos.closeEntry();
                    fis.close();
                    zos.close();
                }
                file.delete();
            }
        }

        /**
         * This is used to add files to a zip that already exits.
         * @param zipFile
         * @param files
         * @throws IOException
         */
        public static void addFilesToExistingZip(File zipFile, File[] files) throws IOException {
            // get a temp file
            File tempFile = File.createTempFile(zipFile.getName(), null);
            // delete it, otherwise you cannot rename your existing zip to it.
            tempFile.delete();

            boolean renameOk = zipFile.renameTo(tempFile);
            if (!renameOk) {
                throw new RuntimeException("could not rename the file " + zipFile.getAbsolutePath() + " to "
                        + tempFile.getAbsolutePath());
            }
            byte[] buf = new byte[1024];

            ZipInputStream zin = new ZipInputStream(new FileInputStream(tempFile));
            ZipOutputStream out = new ZipOutputStream(new FileOutputStream(zipFile));

            ZipEntry entry = zin.getNextEntry();
            while (entry != null) {
                String name = entry.getName();
                boolean notInFiles = true;
                for (File f : files) {
                    if (f.getName().equals(name)) {
                        notInFiles = false;
                        break;
                    }
                }
                if (notInFiles) {
                    // Add ZIP entry to output stream.
                    out.putNextEntry(new ZipEntry(name));
                    // Transfer bytes from the ZIP file to the output file
                    int len;
                    while ((len = zin.read(buf)) > 0) {
                        out.write(buf, 0, len);
                    }
                }
                entry = zin.getNextEntry();
            }
            // Close the streams
            zin.close();
            // Compress the files
            for (int i = 0; i < files.length; i++) {
                InputStream in = new FileInputStream(files[i]);
                // Add ZIP entry to output stream.
                out.putNextEntry(new ZipEntry(files[i].getName()));
                // Transfer bytes from the file to the ZIP file
                int len;
                while ((len = in.read(buf)) > 0) {
                    out.write(buf, 0, len);
                }
                // Complete the entry
                out.closeEntry();
                in.close();
            }
            // Complete the ZIP file
            out.close();
            tempFile.delete();
        }

        public String getCompressBackupsAfterDays() {
            return "" + compressBackupsAfterDays;
        }

        public void setCompressBackupsAfterDays(String days) {
            try {
                compressBackupsAfterDays = Integer.parseInt(days);
            } catch (Exception e) {
                // ignore - just use default
            }
        }

        public String getCompressBackupsDatePattern() {
            return compressBackupsDatePattern;
        }

        public void setCompressBackupsDatePattern(String pattern) {
            compressBackupsDatePattern = pattern;
        }

        public String getCompressMaxNumberDays() {
            return compressMaxNumberDays + "";
        }

        public void setCompressMaxNumberDays(String days) {
            try {
                this.compressMaxNumberDays = Integer.parseInt(days);
            } catch (Exception e) {
                // ignore - just use default
            }
        }

        public String getRollCompressedBackups() {
            return rollCompressedBackups;
        }

        public void setRollCompressedBackups(String rollCompressedBackups) {
            this.rollCompressedBackups = rollCompressedBackups;
        }

    }

    class StartsWithFileFilter implements FileFilter {
        private String startsWith;
        private boolean inclDirs = false;

        /**
         *
         */
        public StartsWithFileFilter(String startsWith, boolean includeDirectories) {
            super();
            this.startsWith = startsWith.toUpperCase();
            inclDirs = includeDirectories;
        }

        /*
         * (non-Javadoc)
         * @see java.io.FileFilter#accept(java.io.File)
         */
        @Override
        public boolean accept(File pathname) {
            if (!inclDirs && pathname.isDirectory()) {
                return false;
            } else
                return pathname.getName().toUpperCase().startsWith(startsWith);
        }
    }

    /**
    * RollingCalendar is a helper class to AdvancedDailyRollingFileAppender. Given a periodicity type and the current time,
    * it computes the start of the next interval.
    */
    class RollingCalendar extends GregorianCalendar {
        private static final long serialVersionUID = -3560331770601814177L;

        int type = AdvancedDailyRollingFileAppender.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 AdvancedDailyRollingFileAppender.TOP_OF_MINUTE:
                    this.set(Calendar.SECOND, 0);
                    this.set(Calendar.MILLISECOND, 0);
                    this.add(Calendar.MINUTE, 1);
                    break;
                case AdvancedDailyRollingFileAppender.TOP_OF_HOUR:
                    this.set(Calendar.MINUTE, 0);
                    this.set(Calendar.SECOND, 0);
                    this.set(Calendar.MILLISECOND, 0);
                    this.add(Calendar.HOUR_OF_DAY, 1);
                    break;
                case AdvancedDailyRollingFileAppender.HALF_DAY:
                    this.set(Calendar.MINUTE, 0);
                    this.set(Calendar.SECOND, 0);
                    this.set(Calendar.MILLISECOND, 0);
                    int hour = get(Calendar.HOUR_OF_DAY);
                    if (hour < 12) {
                        this.set(Calendar.HOUR_OF_DAY, 12);
                    } else {
                        this.set(Calendar.HOUR_OF_DAY, 0);
                        this.add(Calendar.DAY_OF_MONTH, 1);
                    }
                    break;
                case AdvancedDailyRollingFileAppender.TOP_OF_DAY:
                    this.set(Calendar.HOUR_OF_DAY, 0);
                    this.set(Calendar.MINUTE, 0);
                    this.set(Calendar.SECOND, 0);
                    this.set(Calendar.MILLISECOND, 0);
                    this.add(Calendar.DATE, 1);
                    break;
                case AdvancedDailyRollingFileAppender.TOP_OF_WEEK:
                    this.set(Calendar.DAY_OF_WEEK, getFirstDayOfWeek());
                    this.set(Calendar.HOUR_OF_DAY, 0);
                    this.set(Calendar.MINUTE, 0);
                    this.set(Calendar.SECOND, 0);
                    this.set(Calendar.MILLISECOND, 0);
                    this.add(Calendar.WEEK_OF_YEAR, 1);
                    break;
                case AdvancedDailyRollingFileAppender.TOP_OF_MONTH:
                    this.set(Calendar.DATE, 1);
                    this.set(Calendar.HOUR_OF_DAY, 0);
                    this.set(Calendar.MINUTE, 0);
                    this.set(Calendar.SECOND, 0);
                    this.set(Calendar.MILLISECOND, 0);
                    this.add(Calendar.MONTH, 1);
                    break;
                default:
                    throw new IllegalStateException("Unknown periodicity type.");
            }
            return getTime();
        }
    }

    注:原作者的实现代码有两个bug: 如果设置7天, 结果只留下了6天的日志;另外一个就是在我的应用中发现删除文件的目录指定不对.另外一个就是删除只跟文件的名(比如这里的default.log)相 关, 而跟生成的具体rotate log文件的格式(比如default.log.2012-01-12)是无关. 比如default.log.bak这样的文件也认为是7天文件中的一个.java-javascript 风之境地

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  • 原文地址:https://www.cnblogs.com/sky7034/p/2323268.html
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