最近开始接手java，服务端是用spring bootd，然后写了日志，每天用户量多，日志一天将近300MB，有时候要打开也很慢，然后一天天累积，刚开始都存放在debug的时候，甚至一天都有500MB，2天就1G，没几天内存就炸了。后面吧日志分开，放到Debug、info、error，但是时间一长，日志还是占很大内容，刚开始，还是都是我自己手动去删除的。最近发现有一个自动删除的，参考了
非常感谢，终于搞定自动删除，不然过个10天，就得手动去删除一次，很麻烦。
log4j.properties文件代码
log4j.rootLogger = debug,D,I,E
# --------------------------------------- 默认 -------------------------------------------
### 输出DEBUG 级别以上的日志
log4j.appender.D = com.zoe.optimus.mobile.service.properties.MyDailyRollingFileAppender
log4j.appender.D.File = ../jettyNurseLog/debug.log
log4j.appender.D.DatePattern=_yyyy-MM-dd'.log'
log4j.appender.D.Threshold = DEBUG
log4j.appender.D.layout = org.apache.log4j.PatternLayout
log4j.appender.D.layout.ConversionPattern = %-d{yyyy-MM-dd HH:mm:ss} [ %t:%r ] - [ %p ] %m%n
log4j.appender.D.Encoding=UTF-8
### 输出INFO 级别以上的日志
log4j.appender.I = com.zoe.optimus.mobile.service.properties.MyDailyRollingFileAppender
log4j.appender.I.File =../jettyNurseLog/info.log
log4j.appender.I.DatePattern=_yyyy-MM-dd'.log'
log4j.appender.I.Threshold = INFO
log4j.appender.I.layout = org.apache.log4j.PatternLayout
log4j.appender.I.layout.ConversionPattern = %-d{yyyy-MM-dd HH:mm:ss} [ %t:%r ] - [ %p ] %m%n
log4j.appender.I.Encoding=UTF-8
### 输出ERROR 级别以上的日志
log4j.appender.E = com.zoe.optimus.mobile.service.properties.MyDailyRollingFileAppender
log4j.appender.E.File =../jettyNurseLog/error.log
log4j.appender.E.DatePattern=_yyyy-MM-dd'.log'
log4j.appender.E.Threshold = ERROR
log4j.appender.E.layout = org.apache.log4j.PatternLayout
log4j.appender.E.layout.ConversionPattern = %-d{yyyy-MM-dd HH:mm:ss} [ %t:%r ] - [ %p ] %m%n
log4j.appender.E.Encoding=UTF-8
主要是引用com.zoe.optimus.mobile.service.properties.MyDailyRollingFileAppender，在日志文件配置这边，我没有配置 maxBackupIndex（保留日志天数）、maxFileSize（最大文件大小），是默认写在MyDailyRollingFileAppender里面。
maxBackupIndex=8（保留8天日志，包含当天）
maxFileSize = 150 * 1024 * 1024（当天文件大于150MB,拆分）
MyDailyRollingFileAppender.class
import com.zoe.optimus.mobile.service.service.transfusion.TransService;
import java.io.File;
import java.io.FileFilter;
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.Level;
import org.apache.log4j.Logger;
import org.apache.log4j.PatternLayout;
import org.apache.log4j.helpers.CountingQuietWriter;
import org.apache.log4j.spi.LoggingEvent;
/**
* <p>标题: log4j appender扩展<br>
* * （1）按天并且只保留最近n天的 maxBackupIndex 默认8天<br>
* * （2）如果一天的文件过大，可以按配置的大小将一天的文件进行切分 maxFileSize </p>
* <p>描述: </p>
* @version: 1.0
* @date：2022/1/20
**/
public class MyDailyRollingFileAppender extends FileAppender {
private static Logger log=Logger.getLogger(MyDailyRollingFileAppender.class);
// 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;
/**
* The gmtTimeZone is used only in computeCheckPeriod() method.
*/
public static final TimeZone gmtTimeZone = TimeZone.getTimeZone("GMT");
/**
* The default maximum file size is 10MB. , 10K for test
* 150MB拆分
*/
protected long maxFileSize = 150 * 1024 * 1024;
/**
* The date pattern. By default, the pattern is set to "'.'yyyy-MM-dd" meaning daily
* rollover.
*/
private String datePattern = "'.'yyyy-MM-dd";
/**
* There is one backup file by default.
* 保留8天的数据，包含当天
*/
private int maxBackupIndex = 8;
/**
* 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;
private Date now = new Date();
private SimpleDateFormat sdf;
private MyRollingCalendar rollingCalendar = new MyRollingCalendar();
public int checkPeriod = TOP_OF_TROUBLE;
/**
* The default constructor does nothing.
*/
public MyDailyRollingFileAppender() {
}
/**
* 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 MyDailyRollingFileAppender(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;
}
/**
* 设置日志文件最大备份数
* <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 renamed to the value of
* the scheduledFilename variable when the next interval is entered.
*/
public void setMaxBackupIndex(int maxBackups) {
this.maxBackupIndex = maxBackups;
}
/**
* 返回日志文件最大备份数
*/
public int getMaxBackupIndex() {
return maxBackupIndex;
}
/**
* activateOptions译名为激活操作
* 意思是按照配置的参数进行初始化
* scheduledFilename为log的最后一次修改时间
*/
public void activateOptions() {
super.activateOptions();
if (datePattern != null && fileName != null) {
now.setTime(System.currentTimeMillis());
sdf = new SimpleDateFormat(datePattern);
int type = computeCheckPeriod();
printPeriodicity(type);
rollingCalendar.setType(type);
File file = new File(fileName);
scheduledFilename = fileName + sdf.format(new Date(file.lastModified()));
} else {
log.error("删除日志 Either File or DatePattern options are not set for appender [" + name + "].");
}
}
/**
* 根据type打印做出日志打印
* @param type
*/
void printPeriodicity(int type) {
switch (type) {
case TOP_OF_MINUTE:
log.debug("删除日志 Appender [[+name+]] to be rolled every minute.");
break;
case TOP_OF_HOUR:
log.debug("删除日志 Appender [" + name + "] to be rolled on top of every hour.");
break;
case HALF_DAY:
log.debug("删除日志 Appender [" + name + "] to be rolled at midday and midnight.");
break;
case TOP_OF_DAY:
log.debug("删除日志 Appender [" + name + "] to be rolled at midnight.");
break;
case TOP_OF_WEEK:
log.debug("删除日志 Appender [" + name + "] to be rolled at start of week.");
break;
case TOP_OF_MONTH:
log.debug("删除日志 Appender [" + name + "] to be rolled at start of every month.");
break;
default:
log.warn("删除日志 Unknown periodicity for appender [[+name+]].");
}
}
int computeCheckPeriod() {
MyRollingCalendar rollingPastCalendar = new MyRollingCalendar(gmtTimeZone, Locale.ENGLISH);
// set sate to 1970-01-01 00:00:00 GMT
Date epoch = new Date(0);
if (datePattern == null) {
return TOP_OF_TROUBLE;
}
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);
rollingPastCalendar.setType(i);
Date next = new Date(rollingPastCalendar.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.
* 按照周期将当前日志文件转存为日期文件
*/
void rollOver() throws IOException {
log.debug("删除日志 rollOver");
/* 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);
log.debug("删除日志 ------fileName:"+fileName);
log.debug("删除日志 ------datedFilename:"+datedFilename);
log.debug("删除日志 ------scheduledFilename:"+scheduledFilename);
// 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.
//如果最后一次的修改时间为当前时间 ，则不做任何任何操作
if (scheduledFilename.equals(datedFilename)) {
return;
}
// close current file, and rename it to datedFilename 关闭当前文件，重命名为日期文件
this.closeFile();
File target = new File(scheduledFilename);
if (target.exists()) {
target.delete();
}
File file = new File(fileName);
boolean result = file.renameTo(target);
log.debug("删除日志 -----result:"+result);
if (result) {
log.debug("删除日志 "+fileName + " -> " + scheduledFilename);
// If maxBackups <= 0, then there is no file renaming to be done.
if (maxBackupIndex > 0) {
// Delete the oldest file, to keep system happy.
file = new File(fileName + dateBefore());
// 删除很久以前的历史log文件
deleteAncientFilesIfExists(file);
if (file.exists()) {
file.delete();
}
}
} else {
log.error("删除日志 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, false, this.bufferedIO, this.bufferSize);
} catch (IOException e) {
errorHandler.error("setFile(" + fileName + ", false) call failed.");
}
scheduledFilename = datedFilename;
}
/**
* 删除很久以前没有删除的日志文件（如果存在的话）
*
* @param oldestFile
*/
private void deleteAncientFilesIfExists(final File oldestFile) {
// 找出久远日志文件列表
File[] ancientfiles = oldestFile.getParentFile().listFiles(new FileFilter() {
@Override
public boolean accept(File pathname) {
if (pathname.getPath().replaceAll("\\\\", "/").startsWith(fileName.replaceAll("\\\\", "/"))
&& pathname.getName().compareTo(oldestFile.getName()) < 0) {
return true;
} else {
return false;
}
}
});
// 删除久远日志文件列表
for (File ancientfile : ancientfiles) {
// 如果文件比配置的最老日期还老的话，删掉
ancientfile.delete();
}
}
private String dateBefore() {
String dataAnte = "";
if (datePattern != null) {
SimpleDateFormat simpleDateFormat = new SimpleDateFormat(datePattern);
dataAnte = simpleDateFormat
.format(new Date(rollingCalendar.getPastCheckMillis(new Date(), maxBackupIndex)));
}
return dataAnte;
}
/**
* This method differentiates DailyRollingFileAppender 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) {
// 根据文件大小roll over
rollOverBySize();
// 根据时间roll over
rollOverByTime();
super.subAppend(event);
}
/**
* 根据文件大小roll over
*/
private void rollOverBySize() {
long currentTimeMillis = System.currentTimeMillis();
now.setTime(currentTimeMillis);
if (fileName != null && qw != null) {
long size = ((CountingQuietWriter) qw).getCount();
if (size >= maxFileSize) {
// close current file, and rename it
this.closeFile();
String rollingFileName = fileName + sdf.format(now) + '.' + currentTimeMillis;
new File(fileName).renameTo(new File(rollingFileName));
try {
// This will also close the file. This is OK since multiple close
// operations
// are safe.
this.setFile(fileName, false, this.bufferedIO, this.bufferSize);
} catch (IOException e) {
errorHandler.error("setFile(" + fileName + ", false) call failed.");
}
}
}
}
/**
* 根据时间roll over
*/
private void rollOverByTime() {
long currentTime = System.currentTimeMillis();
if (currentTime < nextCheck) {
return;
}
now.setTime(currentTime);
nextCheck = rollingCalendar.getNextCheckMillis(now);
try {
rollOver();
} catch (IOException ioe) {
log.error("删除日志 rollOver() failed.", ioe);
}
}
@Override
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());
}
}
@Override
protected void setQWForFiles(Writer writer) {
this.qw = new CountingQuietWriter(writer, errorHandler);
}
}
/**
* * MyRollingCalendar is a helper class to DailyMaxRollingFileAppender. Given a periodicity
* * * type and the current time, it computes the past maxBackupIndex date.</p>
* MyDailyRollingFileAppender的内部类
* 提供周期类型和当前时间 ，计算并返回下一个周期的开始时间
*/
class MyRollingCalendar extends GregorianCalendar {
private static final long serialVersionUID = 1L;
public static final int TOP_OF_TROUBLE = -1;
public static final int TOP_OF_MINUTE = 0;
public static final int TOP_OF_HOUR = 1;
public static final int HALF_DAY = 2;
public static final int TOP_OF_DAY = 3;
public static final int TOP_OF_WEEK = 4;
public static final int TOP_OF_MONTH = 5;
int type = TOP_OF_TROUBLE;
MyRollingCalendar() {
super();
}
MyRollingCalendar(TimeZone tz, Locale locale) {
super(tz, locale);
}
public long getPastCheckMillis(Date now, int maxBackupIndex) {
return getPastDate(now, maxBackupIndex).getTime();
}
public Date getPastDate(Date now, int maxBackupIndex) {
this.setTime(now);
switch (type) {
case TOP_OF_MINUTE:
this.set(Calendar.MINUTE, this.get(Calendar.MINUTE) - maxBackupIndex);
break;
case TOP_OF_HOUR:
this.set(Calendar.HOUR_OF_DAY, this.get(Calendar.HOUR_OF_DAY) - maxBackupIndex);
break;
case HALF_DAY:
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.set(Calendar.DAY_OF_MONTH, this.get(Calendar.DAY_OF_MONTH) - maxBackupIndex);
break;
case TOP_OF_DAY:
this.set(Calendar.DATE, this.get(Calendar.DATE) - maxBackupIndex);
break;
case TOP_OF_WEEK:
this.set(Calendar.DAY_OF_WEEK, getFirstDayOfWeek());
this.set(Calendar.WEEK_OF_YEAR, this.get(Calendar.WEEK_OF_YEAR) - maxBackupIndex);
break;
case TOP_OF_MONTH:
this.set(Calendar.MONTH, this.get(Calendar.MONTH) - maxBackupIndex);
break;
default:
throw new IllegalStateException("Unknown periodicity type.");
}
return this.getTime();
}
public long getNextCheckMillis(Date now) {
return getNextCheckDate(now).getTime();
}
/**
* 根据所传入的时间以及时间类型获取下一个时间
* @param now
* @return
*/
public Date getNextCheckDate(Date now) {
this.setTime(now);
switch (type) {
case TOP_OF_MINUTE:
this.set(Calendar.SECOND, 0);
this.set(Calendar.MILLISECOND, 0);
this.add(Calendar.MINUTE, 1);
break;
case 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 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 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 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 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();
}
void setType(int type) {
this.type = type;
}
}
当天超出150MB的文件，备份的文件夹名称是debug.log_当天日期.log.当前时间戳
是这位大神
帮我解决了，谢谢，写这篇文章是为了记录。