log4j.xml示例

<?xml version="1.0" encoding="UTF-8"?>  
<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd">  
<log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/" debug="false">  

  <appender name="ROLLING" class="org.apache.log4j.RollingFileAppender">  
      <layout class="org.apache.log4j.PatternLayout">  
          <param name="ConversionPattern" value="%d %5p %c %x - %m%n" />  
      </layout>  
      <param name="File" value="example.log" />
      <param name="MaxFileSize" value="50MB" />
      <param name="MaxBackupIndex" value="9" />
  </appender>
      
  <appender name="CONSOLE" class="org.apache.log4j.ConsoleAppender">  
      <layout class="org.apache.log4j.PatternLayout">  
          <param name="ConversionPattern" value="%d %5p %c %x - %m%n" />  
      </layout>  
      <param name="Threshold" value="info" />
  </appender>

  <appender name="ASYNC" class="org.apache.log4j.AsyncAppender">  
      <param name="BufferSize" value="10000" />  
      <param name="Blocking" value="false" />
      <appender-ref ref="ROLLING" />  
      <appender-ref ref="CONSOLE" />
  </appender>  
       
  <root>  
      <level value="info" />  
      <appender-ref ref="ASYNC" />  
  </root>  
      
  <logger name="MyName">  
      <level value="debug"/>  
  </logger>  
      
</log4j:configuration>