log4j.properties 配置(实例讲解)

1、需要的jar如下:

!-- log4j -->
<dependency>
 <groupId>log4j</groupId>
 <artifactId>log4j</artifactId>
 <version>1.2.17</version>
</dependency>
<dependency>
 <groupId>org.slf4j</groupId>
 <artifactId>slf4j-api</artifactId>
 <version>1.7.4</version>
</dependency>
<dependency>
 <groupId>org.slf4j</groupId>
 <artifactId>slf4j-log4j12</artifactId>
 <version>1.7.4</version>
 <scope>runtime</scope>
</dependency> 

2、将log4j.properties放入项目src路径下即可，虚拟机会自动加载日志配置文件，文件内容如下：

### set log levels ###
log4j.rootLogger = DEBUG , C , D , E 

### console ###
log4j.appender.C = org.apache.log4j.ConsoleAppender
log4j.appender.C.Target = System.out
log4j.appender.C.layout = org.apache.log4j.PatternLayout
log4j.appender.C.layout.ConversionPattern = [mybatis_study][%p] [%-d{yyyy-MM-dd HH\:mm\:ss}] %C.%M(%L) | %m%n

### log file ###
log4j.appender.D = org.apache.log4j.DailyRollingFileAppender
log4j.appender.D.File = ../logs/mybatis_study.log
log4j.appender.D.Append = true
log4j.appender.D.Threshold = INFO
log4j.appender.D.layout = org.apache.log4j.PatternLayout
log4j.appender.D.layout.ConversionPattern = [mybatis_study][%p] [%-d{yyyy-MM-dd HH\:mm\:ss}] %C.%M(%L) | %m%n

### exception ###
log4j.appender.E = org.apache.log4j.DailyRollingFileAppender
log4j.appender.E.File = ../logs/mybatis_study_error.log
log4j.appender.E.Append = true
log4j.appender.E.Threshold = ERROR
log4j.appender.E.layout = org.apache.log4j.PatternLayout
log4j.appender.E.layout.ConversionPattern = [mybatis_study][%p] [%-d{yyyy-MM-dd HH\:mm\:ss}] %C.%M(%L) | %m%n

###mybatis show sql###
log4j.logger.com.ibatis=debug
log4j.logger.com.ibatis.common.jdbc.SimpleDataSource=debug
log4j.logger.com.ibatis.common.jdbc.ScriptRunner=debug
log4j.logger.com.ibatis.sqlmap.engine.impl.SqlMapClientDelegate=debug

log4j.logger.java.sql.Connection=debug
log4j.logger.java.sql.Statement=debug
log4j.logger.java.sql.PreparedStatement=debug

3、也可以配置log4j.xml,如下：

<?xml version="1.0" encoding="UTF-8"?>
 <!DOCTYPE log4j:configuration PUBLIC "-//APACHE//DTD LOG4J 1.2//EN" "log4j.dtd">
 <log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/"> 

  <!-- [控制台STDOUT] -->
  <appender name="console" class="org.apache.log4j.ConsoleAppender">
   <param name="encoding" value="GBK" />
   <param name="target" value="System.out" />
   <layout class="org.apache.log4j.PatternLayout">
   <param name="ConversionPattern" value="%-5p %c{2} - %m%n" />
   </layout>
  </appender> 

  <!-- [公共Appender] -->
  <appender name="DEFAULT-APPENDER" class="org.apache.log4j.DailyRollingFileAppender">
   <param name="File" value="${webapp.root}/logs/rms-default.log" />
   <param name="Append" value="true" />
   <param name="encoding" value="GBK" />
   <param name="DatePattern" value="'.'yyyy-MM-dd'.log'" />
   <layout class="org.apache.log4j.PatternLayout">
  <param name="ConversionPattern" value="%d %-5p %c{2} - %m%n" />
   </layout>
  </appender> 

  <!-- [错误日志APPENDER] -->
  <appender name="ERROR-APPENDER" class="org.apache.log4j.DailyRollingFileAppender">
   <param name="File" value="${webapp.root}/logs/rms-error.log" />
   <param name="Append" value="true" />
   <param name="encoding" value="GBK" />
   <param name="threshold" value="error" />
   <param name="DatePattern" value="'.'yyyy-MM-dd'.log'" />
   <layout class="org.apache.log4j.PatternLayout">
   <param name="ConversionPattern" value="%d %-5p %c{2} - %m%n" />
   </layout>
  </appender> 

  <!-- Root Logger -->
  <root>
   <level value="${rootLevel}"></level>
   <appender-ref ref="DEFAULT-APPENDER" />
   <appender-ref ref="ERROR-APPENDER" />
   <appender-ref ref="console" />
  </root>
 </log4j:configuration>

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