将Log4j按不同级别输出到不同文件【是网上别的童鞋的一篇帖子，但我改了点东西，就属于翻译吧^_^】

 主要是靠org.apache.log4j.varia.LevelRangeFilter这个类

log4j.xml文件：

<?xml version="1.0" encoding="UTF-8"?> 

<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd"> 

<log4j:configuration xmlns:log4j='http://jakarta.apache.org/log4j/'> 

    

  <appender name="stdout" class="org.apache.log4j.ConsoleAppender"> 

      <layout class="org.apache.log4j.PatternLayout"> 

          <param name="ConversionPattern" 

              value="%d{yyyy/MM/dd HH:mm:ss.sss} [%-5p] %c - %m%n"/> 

      </layout> 

   </appender> 

     

   <appender name="traceLog4Debug" class="org.apache.log4j.RollingFileAppender"> 

       <param name="File" value="C:/traceLog4Debug.log"/> 

       <param name="maxFileSize" value="2000KB"/> 

       <param name="maxBackupIndex" value="20"/> 

       <layout class="org.apache.log4j.PatternLayout"> 

           <param name="ConversionPattern" 

               value="%d{yyyy/MM/dd HH:mm:ss.sss} [%-5p] %c - %m%n"/> 

       </layout> 

   </appender> 

     

   <appender name="debugLog" class="org.apache.log4j.RollingFileAppender"> 

       <param name="File" value="C:/debug.log"/> 

       <param name="maxFileSize" value="2000KB"/> 

       <param name="maxBackupIndex" value="10"/> 

       <layout class="org.apache.log4j.PatternLayout"> 

           <param name="ConversionPattern" 

               value="%d{yyyy/MM/dd HH:mm:ss.sss} [%-5p] %c - %m%n"/> 

       </layout> 

       <!-- <SPAN style="COLOR: #ff0000"> --><!-- filter作用？  配置LevelMax与LevelMin限定输出到文件的日志级别 --> 

       <filter class="org.apache.log4j.varia.LevelRangeFilter"> 

                       <param name="LevelMax" value="DEBUG" /> 

                       <param name="LevelMin" value="DEBUG" /> 

               </filter><!-- </SPAN>  -->

   </appender> 

     

   <appender name="infoLog" class="org.apache.log4j.RollingFileAppender"> 

       <param name="File" value="C:/info.log"/> 

       <param name="maxFileSize" value="2000KB"/> 

       <param name="maxBackupIndex" value="10"/> 

       <layout class="org.apache.log4j.PatternLayout"> 

           <param name="ConversionPattern" 

               value="%d{yyyy/MM/dd HH:mm:ss.sss} [%-5p] %c - %m%n"/> 

       </layout> 

       <filter class="org.apache.log4j.varia.LevelRangeFilter"> 

                   <param name="LevelMax" value="INFO" /> 

                   <param name="LevelMin" value="INFO" /> 

           </filter> 

   </appender>  

     <!--测试不同的包名路径，输出到不同的日志文件-->  

   <appender name="infotest" class="org.apache.log4j.RollingFileAppender"> 

       <param name="File" value="C:/info_test.log"/> 

       <param name="maxFileSize" value="2000KB"/> 

       <param name="maxBackupIndex" value="10"/> 

       <layout class="org.apache.log4j.PatternLayout"> 

           <param name="ConversionPattern" 

               value="%d{yyyy/MM/dd HH:mm:ss.sss} [%-5p] %c - %m%n"/> 

       </layout> 

       <filter class="org.apache.log4j.varia.LevelRangeFilter"> 

                   <param name="LevelMax" value="INFO" /> 

                   <param name="LevelMin" value="INFO" /> 

           </filter> 

   </appender>

     

   <appender name="warnLog" class="org.apache.log4j.RollingFileAppender"> 

       <param name="File" value="C:/warn.log"/> 

       <param name="maxFileSize" value="2000KB"/> 

       <param name="maxBackupIndex" value="10"/> 

       <layout class="org.apache.log4j.PatternLayout"> 

           <param name="ConversionPattern" 

               value="%d{yyyy/MM/dd HH:mm:ss.sss} [%-5p] %c - %m%n"/> 

       </layout> 

       <filter class="org.apache.log4j.varia.LevelRangeFilter"> 

                   <param name="LevelMax" value="WARN" /> 

                   <param name="LevelMin" value="WARN" /> 

           </filter> 

   </appender> 

     

   <appender name="errorLog" class="org.apache.log4j.RollingFileAppender"> 

       <param name="File" value="C:/error.log"/> 

       <param name="maxFileSize" value="2000KB"/> 

       <param name="maxBackupIndex" value="10"/> 

       <layout class="org.apache.log4j.PatternLayout"> 

           <param name="ConversionPattern" 

               value="%d{yyyy/MM/dd HH:mm:ss.sss} [%-5p] %c - %m%n"/> 

       </layout> 

       <filter class="org.apache.log4j.varia.LevelRangeFilter"> 

                   <param name="LevelMax" value="ERROR" /> 

                   <param name="LevelMin" value="ERROR" /> 

           </filter> 

   </appender> 

     

   <!-- 记录该包下所有日志，不同级别输出到不同日志文件 --> 

   <logger name="com.unlun.hfzc"> 

       <level value="ALL"/> 

       <appender-ref ref="stdout"/> 

       <appender-ref ref="traceLog4Debug"/> 

       <appender-ref ref="debugLog"/> 

       <appender-ref ref="infoLog"/> 

       <appender-ref ref="warnLog"/> 

       <appender-ref ref="errorLog"/> 

   </logger>  
  <!--测试不同的包名路径，输出到不同的日志文件-->  

   <logger name="com.hisunsray.commons.database"> 

       <level value="ALL"/> 

       <appender-ref ref="infotest"/>

   </logger>   

     

   <logger name="org.hibernate.SQL"> 

       <level value="DEBUG"/> 

       <appender-ref ref="traceLog4Debug"/> 

       <appender-ref ref="stdout"/> 

   </logger> 

     

   <logger name="org.hibernate"> 

       <level value="error"/> 

        <appender-ref ref="traceLog4Debug"/> 

        <appender-ref ref="stdout"/> 

    </logger> 

      

    <logger name="org.springframework"> 

        <level value="error"/> 

        <appender-ref ref="traceLog4Debug"/> 

        <appender-ref ref="stdout"/> 

    </logger> 

 

      

</log4j:configuration> 写一个测试类：

 

package com.unlun.hfzc;

import org.apache.log4j.Logger;

import junit.framework.TestCase;

public class Log4jTest extends TestCase {

 private Logger logger=Logger.getLogger(this.getClass());

 //private Logger logger2=Logger.getLogger("debug");

 

 public void testLog4j(){

  /*logger.info("Hello World!");

  logger.debug("Debug Test");*/

  

  logger.debug("debug...");  

  logger.info("info...");  

  logger.warn("warn...");  

  logger.error("error...");

 }

}