Introduction and introduction of logback

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logback Introduction to relevant tutorials

The author will talk about it below logback Related introduction and description of the log component , As shown below :

logback brief introduction

 logback Is an open source logging component   It is from log4j Designed by the author of , Have better features , Used in place of log4j A log framework for 

logback Module

logback-core: yes logback-access,logback-classic The foundation of the two modules 
logback-classic: It is log4j An improved version of , At the same time, it completely realizes slf4j API, So that we can log in other systems , Such as log4j and JDK14 Logging Conversion in 
logback-access: Access modules and Servlet Container Integration , by tomcat And so on Http To access the function of the log 

logback Main classes

Logger:logback-classic Module , As a log recorder , Relate it to the application's corresponding context after , It is mainly used to store log objects , You can also define the log type 、 Level . Same as log4j logger Function the same 
Appender: be located logback-core in , It is mainly used to specify the destination of log output , The destination can be the console 、 file 、 Remote socket server 、MySQL、PostreSQL、Oracle And other databases 、JMS And remote UNIX Syslog Daemons, etc .
Layout: be located logback-core in , Responsible for converting events to strings , Format the output of log information , For details, see log4j Of layout Detailed explanation 
Appender and Layout  Not care Logger The existence of , Don't depend on Logger, At the same time, we can see ,Logger  Will depend on Appender  and  Layout  With the help of , Log information can be printed normally 
filter:Filter Mainly used in appeder On , Only in appender Level works , Play a role in filtering logs .

The level of logging

logback Yes 5 Class

TRACE < DEBUG < INFO < WARN < ERROR, Defined in ch.qos.logback.classic.Level Class .

The configuration file

logback You can use logback.xml To configure 

logback Configure the reading steps :
  1. Try to classpath Look for the file logback-test.xml
  2. When the file doesn't exist , Find the file logback.xml
  3. When both files do not exist , Then use BasicConfigurator Automatically configure yourself , Output the record to the console 

maven rely on

<dependency>
  <groupId>org.slf4j</groupId>
  <artifactId>slf4j-api</artifactId>
  <version>1.7.21</version>
</dependency>

<dependency>
  <groupId>ch.qos.logback</groupId>
  <artifactId>logback-core</artifactId>
  <version>1.1.7</version>
</dependency>
<dependency>
  <groupId>ch.qos.logback</groupId>
  <artifactId>logback-classic</artifactId>
  <version>1.1.7</version>
</dependency>