日志log4j按日期生成文件夹

朱雀 2023-10-11 12:04 19阅读 0赞

按日期生成文件夹，自动清理N天前的日志。并且可以设置每个文件最大内存为多少，以及当天允许生成的最大文件个数

![905646-20190917155117084-1593814581.png][]

API：log4j

主要步骤：继承log4j的org.apache.log4j.RollingFileAppender类，重写setFile、subAppend方法

配置文件：修改log4j的配置文件，将使用的类指向自己写的继承的类，改写日志文件目录格式

**JAVA代码**

1 package com.montnets.ljbank.util;
      2 
      3 
      4 import java.io.File;
      5 import java.io.IOException;
      6 import java.text.ParseException;
      7 import java.text.SimpleDateFormat;
      8 import java.util.Date;
      9 import java.util.HashMap;
     10 import java.util.Map;
     11 import java.util.regex.Matcher;
     12 import java.util.regex.Pattern;
     13 
     14 import org.apache.log4j.RollingFileAppender;
     15 import org.apache.log4j.helpers.CountingQuietWriter;
     16 import org.apache.log4j.helpers.LogLog;
     17 import org.apache.log4j.spi.LoggingEvent;
     18 
     19 import com.montnets.ljbank.constant.ConfigConstant;
     20 
     21 //继承log4j的RollingFileAppender类  
     22 public class MyRollingFileAppender extends RollingFileAppender {
     23 
     24     private long nextRollover = 0;
     25     private static Map<String, BeginFileData> fileMaps = new HashMap<String, BeginFileData>();
     26     private static final SimpleDateFormat sdf = new SimpleDateFormat("yyyy/MM/dd");
     27     private static final SimpleDateFormat sdf1 = new SimpleDateFormat("yyyy-MM-dd");
     28 
     29     public void rollOver () {
     30 
     31         File target;
     32         File file;
     33         int maxBackupIndexLeng = String.valueOf(maxBackupIndex).length();
     34         if (qw != null) {
     35             long size = ((CountingQuietWriter) qw).getCount();
     36             LogLog.debug("rolling over count=" + size);
     37             nextRollover = size + maxFileSize;
     38         }
     39         //1
     40         LogLog.debug("maxBackupIndex=" + maxBackupIndex);
     41         String nowDateString = sdf.format(new Date());
     42         String newFileName = (fileName.indexOf(".") != -1 ? fileName.substring(0,
     43                 fileName.lastIndexOf(".")) : fileName);
     44 
     45         boolean renameSucceeded = true;
     46         String nowDateStr = sdf1.format(new Date());
     47         if (maxBackupIndex > 0) {
     48 
     49             
     50 //            file = new File(newFileName + '.' + nowDateString + '.'
     51 //                    + getIndex(maxBackupIndex, maxBackupIndexLeng));
     52             
     53             file = new File(newFileName + '.' + nowDateStr + '.'
     54                     + getIndex(maxBackupIndex, maxBackupIndexLeng));
     55 
     56             if (file.exists()) {
     57                 renameSucceeded = file.delete();
     58             }
     59             /**
     60              * 删除最后一个文件，文件名+1
     61              * */        
     62             for (int i = maxBackupIndex - 1; (i >= 1 && renameSucceeded); i--) {
     63 //                file = new File(newFileName + '.' + nowDateString + '.'
     64 //                        + getIndex(i, maxBackupIndexLeng));
     65                 file = new File(newFileName + '.' + nowDateStr + '.'
     66                         + getIndex(i, maxBackupIndexLeng));
     67                 if (file.exists()) {
     68                     //行动文件名
     69 //                    target = new File(newFileName + '.' + nowDateString + '.'
     70 //                            + getIndex(i + 1, maxBackupIndexLeng));
     71                     target = new File(newFileName + '.' + nowDateStr + '.'
     72                             + getIndex(i + 1, maxBackupIndexLeng));
     73                     LogLog.debug("Renaming file " + file + " to " + target);
     74                     renameSucceeded = file.renameTo(target);
     75                 }
     76             }
     77 
     78             if (renameSucceeded) {
     79                 BeginFileData beginFileData = fileMaps.get(fileName);
     80                 // 在每天一个日志目录的方式下，检测日期是否变更了，如果变更了就要把变更后的日志文件拷贝到变更后的日期目录下。
     81                 String pattern = "yyyy/MM/dd";
     82                 if (newFileName.indexOf(nowDateString) == -1
     83                         && beginFileData.getFileName().indexOf(pattern) != -1) {
     84                     newFileName = beginFileData.getFileName().replace(pattern,
     85                             nowDateString);
     86                     newFileName = (newFileName.indexOf(".") != -1 ? newFileName
     87                             .substring(0, newFileName.lastIndexOf(".")) : newFileName);
     88                 }
     89 //                target = new File(newFileName + '.' + nowDateString + '.'
     90 //                        + getIndex(1, maxBackupIndexLeng));
     91                 target = new File(newFileName + '.' + nowDateStr + '.'
     92                         + getIndex(1, maxBackupIndexLeng));
     93                 this.closeFile();
     94                 file = new File(fileName);
     95                 LogLog.debug("Renaming file " + file + " to " + target);
     96 
     97                 renameSucceeded = file.renameTo(target);
     98                 if (!renameSucceeded) {
     99                     try {
    100                         this.setFile(fileName, true, bufferedIO, bufferSize);
    101                     } catch (IOException e) {
    102                         LogLog.error("setFile(" + fileName + ", true) call failed.", e);
    103                     }
    104                 }
    105             }
    106         }
    107         if (renameSucceeded) {
    108 
    109             try {
    110 
    111                 this.setFile(fileName, false, bufferedIO, bufferSize);
    112                 nextRollover = 0;
    113             } catch (IOException e) {
    114                 LogLog.error("setFile(" + fileName + ", false) call failed.", e);
    115             }
    116         }
    117         //删除指定日期前文件
    118         //清理指定日期前的日志
    119         String rootDir = (fileName.indexOf("/") != -1 ? fileName.substring(0,
    120                 fileName.indexOf("/")) : fileName);
    121         long expireTime = ConfigConstant.MAXDAYS*24*60*60*1000L; //ConfigConstant.MAXDAYS是从配置文件中读取的一个常量，表示日志保留天数 122         cleanExpireFiles(rootDir,expireTime);
    123     }
    124 
    125     /**
    126      * 文件个数的长度补零，如果文件个数为10那么文件的个数长度就是2位，第一个文件就是01，02，03....
    127      * 
    128      * @param i
    129      * @param maxBackupIndexLeng
    130      * @return
    131      */
    132     private String getIndex (int i, int maxBackupIndexLeng) {
    133         String index = String.valueOf(i);
    134         int len = index.length();
    135         for (int j = len; j < maxBackupIndexLeng; j++) {
    136             index = "0" + index;
    137         }
    138         return index + ".log";
    139     }
    140 
    141     /**
    142      * This method differentiates RollingFileAppender from its super class.
    143      * 
    144      * @since 0.9.0
    145      */
    146     protected void subAppend (LoggingEvent event) {
    147         super.subAppend(event);
    148         if (fileName != null && qw != null) {
    149 
    150             String nowDate = sdf.format(new Date());
    151             // 检测日期是否已经变更了，如果变更了就要重创建日期目录
    152             if (!fileMaps.get(fileName).getDate().equals(nowDate)) {
    153                 rollOver();
    154                 return;
    155             }
    156 
    157             long size = ((CountingQuietWriter) qw).getCount();
    158             if (size >= maxFileSize && size >= nextRollover) {
    159                 rollOver();
    160             }
    161         }
    162     }
    163 
    164     private void cleanExpireFiles(String savePath,long expireTime) {
    165         //日志根目录
    166         File fileRootDir= new File(savePath);
    167         if(!fileRootDir.exists()){
    168             return;
    169         }
    170         //遍历根目录下的文件夹
    171         //如果文件是n天前的就删除
    172         //当前时间
    173         long currentTime =System.currentTimeMillis();
    174         File file = null;
    175         try{
    176             
    177             File[] files = fileRootDir.listFiles();
    178             if(files != null && files.length > 0){
    179                 for(int i = 0; i< files.length; i++){
    180                     file = files[i];
    181                     long fileTime = file.lastModified();
    182                     if(file.isDirectory()){
    183                         cleanExpireFiles(file.getAbsolutePath(),expireTime);
    184                         //文件夹内文件为空，则删除成功
    185                         file.delete();
    186                     }else{
    187                         //获取文件中的日期
    188                         String fileTimeStr = getRqStr(file.getName());
    189                         Date fileDate = null;
    190                         try {
    191                             if(fileTimeStr !=null){
    192                                 fileDate =sdf1.parse(fileTimeStr);
    193                                 fileTime = fileDate.getTime();
    194                             }
    195                         } catch (ParseException e) {
    196                             fileTime = currentTime;
    197 //                            fileTime = file.lastModified();
    198                         }
    199                         //如果文件最后更新时间是N天前就删除
    200                         if(currentTime - fileTime > expireTime){
    201                             file.delete();
    202                         }
    203                     }
    204             }
    205           }    
    206         }catch (Exception e) {
    207             LogLog.error("删除过期日志失败!", e);
    208         }
    209     }
    210 
    211     @Override
    212     public synchronized void setFile (String fileName, boolean append,
    213             boolean bufferedIO, int bufferSize) throws IOException {
    214 
    215         String pattern = "yyyy/MM/dd";
    216         String nowDate = sdf.format(new Date());
    217         // 如果文件路径包含了“yyyy-MM-dd”就是每天一个日志目录的方式记录日志(第一次的时候)
    218         if (fileName.indexOf(pattern) != -1) {
    219             String beginFileName = fileName;
    220             fileName = fileName.replace(pattern, nowDate);
    221             fileMaps.put(fileName, new BeginFileData(beginFileName, nowDate));
    222         }
    223         BeginFileData beginFileData = fileMaps.get(fileName);
    224         // 检测日期是否已经变更了，如果变更了就要把原始的字符串给fileName变量，把变更后的日期做为开始日期
    225         if (!beginFileData.getDate().equals(nowDate)) {
    226             // 获取出第一次的文件名
    227             beginFileData.setDate(nowDate);
    228             fileName = beginFileData.getFileName().replace(pattern, nowDate);
    229             fileMaps.put(fileName, beginFileData);
    230         }
    231 
    232         // D:/data/test/yyyy-MM-dd/test.log 替换yyyy-MM-dd为当前日期。
    233         File file = new File(fileName);
    234         File parentFile = file.getParentFile();
    235         if (!parentFile.exists()) {
    236             parentFile.mkdirs();
    237         }
    238 
    239         super.setFile(fileName, append, this.bufferedIO, this.bufferSize);
    240     }
    241     
    242     /**
    243      * 获取文件中的日期
    244      * @param mes
    245      * @return
    246      */
    247     public static String getRqStr(String mes){
    248         String format = ".*([0-9]{4})-(0[1-9]|1[012])-(0[1-9]|[12][0-9]|3[01]).*";
    249         String yms = null;
    250         Pattern pattern = Pattern.compile(format);
    251         Matcher matcher = pattern.matcher(mes);
    252         if (matcher.matches()) {
    253             pattern = Pattern.compile(".*(\\d{4}-\\d{2}-\\d{2}).*");
    254             matcher = pattern.matcher(mes);
    255             if (matcher.matches()) {
    256                 yms = matcher.group(1);
    257             }
    258             return yms;
    259         }
    260         return yms;
    261     
    262     }
    263     public static void main(String[] args) {
    264         String rootDir = "E:\\dell\\workspaces\\MyEclipse 10\\ljBank\\logger";
    265         long expireTime = 1*24*60*60*1000L;
    266         new MyRollingFileAppender().cleanExpireFiles(rootDir,expireTime);
    267     }
    268 
    269     private class BeginFileData {
    270 
    271         public BeginFileData (String fileName, String date) {
    272             super();
    273             this.fileName = fileName;
    274             this.date = date;
    275         }
    276 
    277         private String fileName;
    278         private String date;
    279 
    280         public String getFileName () {
    281             return fileName;
    282         }
    283         public void setFileName (String fileName) {
    284             this.fileName = fileName;
    285         }
    286         public String getDate () {
    287             return date;
    288         }
    289         public void setDate (String date) {
    290             this.date = date;
    291         }
    292     }
    293 }

**log4j.properties**

log4j.rootLogger=console,logfile
    log4j.additivity.org.apache=true
    log4j.logger.org.apache=off
    log4j.logger.com.mchange=off
    
    # 配置为继承RollingFileAppender类重写其方法的子类
    log4j.appender.logfile=com.montnets.ljbank.util.MyRollingFileAppender
    log4j.appender.logfile.File=logger/yyyy/MM/dd/ljBankLog.log
    log4j.appender.logfile.Threshold=INFO
    # 每个日志文件的最大内存
    log4j.appender.logfile.MaxFileSize=20MB
    # 一天内允许生成日志文件的最大个数
    log4j.appender.logfile.maxBackupIndex=30
    log4j.appender.logfile.layout=org.apache.log4j.PatternLayout
    log4j.appender.logfile.layout.ConversionPattern=[%p]%d{yy/MM/dd HH\:mm\:ss\:SSS} %m%n

参考地址 [https://blog.csdn.net/a15123837995/article/list/1?][https_blog.csdn.net_a15123837995_article_list_1]

转载于:https://www.cnblogs.com/kiko2014551511/p/11534418.html

[905646-20190917155117084-1593814581.png]: https://img2018.cnblogs.com/blog/905646/201909/905646-20190917155117084-1593814581.png
[https_blog.csdn.net_a15123837995_article_list_1]: https://blog.csdn.net/a15123837995/article/list/1?