Description of rollingfileappender attribute in logback

from :

logback in RollingFileAppender Description of property introduction

The following is about logback in RollingFileAppender Property setting method sharing , As shown below :

logback in RollingFileAppender For scrolling record files   First log to the specified file   When a condition is met , Log to other files  

RollingFileAppender attribute

<file>: The name of the file being written , It can be a relative Directory , It can also be an absolute catalog 
    If the parent directory does not exist, it will be created automatically , No default 

<append>: When set to true, The log is appended to the end of the file 
                When set to false, Empty existing files , The default is true

<rollingPolicy>: When rolling happens , decision RollingFileAppender act , It involves moving and renaming files 
        attribute class Define specific rolling strategy classes ,"ch.qos.logback.core.rolling.TimeBasedRollingPolicy" Is the most commonly used scrolling strategy 
	       It makes rolling strategies based on time , Responsible for rolling as well as starting rolling .

<fileNamePattern>： Necessary nodes , Contains the file name and “%d” Conversion character ,“%d” It can contain a java.text.SimpleDateFormat Specified time format , Such as ：%d{yyyy-MM}
     When used directly  %d, The default format is  yyyy-MM-dd
    RollingFileAppender Of file Byte points are optional , By setting file
      You can specify different locations for active and archived files , The current log always records file Specified file （ Activity file ）
     The name of the active file will not change 
     If not file, The name of the activity file will be based on fileNamePattern  Value 
    Change every once in a while 
   “/” perhaps “\” Will be used as a directory separator 
  
<maxHistory>: Optional nodes , Control the maximum number of archive files that are retained , Delete old files if the number exceeds 
     Suppose you set the scroll every month , And <maxHistory> yes 6, Save only recent 6 Months of documents , Delete old files before 
	  Be careful , Deleting old files is , Directories created for archiving will also be deleted ."ch.qos.logback.core.rolling.SizeBasedTriggeringPolicy" Is to view the size of the currently active file ,
	  If it exceeds the specified size, it will inform RollingFileAppender  Triggers the scrolling of the currently active file . Only one node :

<maxFileSize>: This is the size of the active file , The default value is 10MB.

<prudent>： When it comes to true when , I won't support it FixedWindowRollingPolicy
    Support TimeBasedRollingPolicy, But there are two limitations ,1 File compression is not supported or allowed ,2 Cannot set file attribute , Must be left blank .

<triggeringPolicy >:  inform  RollingFileAppender  Appropriate to activate scrolling ."ch.qos.logback.core.rolling.FixedWindowRollingPolicy" 
       According to the fixed window algorithm rename the file rolling strategy .

<minIndex>: Minimum window index 

<maxIndex>: Maximum window index , When the window specified by the user is too large , Will automatically set the window to 12.

<fileNamePattern>: Must contain “%i” for example , Suppose that the minimum and maximum values are respectively 1 and 2, The naming pattern is  mylog%i.log,
      There will be an archive mylog1.log and mylog2.log. You can also specify file compression options , for example ,mylog%i.log.gz  Or not log%i.log.zip

<encoder>： Format the recorded events . Responsible for two things ,
       One is to convert log information into byte array 
	   The second is to write the byte array to the output stream 
	  PatternLayoutEncoder  Is the only useful and default encoder
	    There is one <pattern> node , Used to set the input format of the log 
	    Use “%” Add “ Conversion character ” The way , If you want to output “%”, You have to use “\” Yes “\%” Transference 

example

// Generate a log file every day , preservation 20 Days of log files  
<configuration> 
　　<appender name="FILE" class="ch.qos.logback.core.rolling.RollingFileAppender"> 
　　　　<rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy"> 
　　　　　　<fileNamePattern>logFile.%d{yyyy-MM-dd}.log</fileNamePattern> 
　　　　　　<maxHistory>20</maxHistory> 
　　　　</rollingPolicy> 
　　　　<encoder> 
　　　　　　<pattern>%-4relative [%thread] %-5level %logger{35} - %msg%n</pattern> 
　　　　</encoder> 
　　</appender> 
 
　　<root level="DEBUG"> 
　　　　<appender-ref ref="FILE" /> 
　　</root> 
</configuration>