LOG4J Configuration Practices

When using log4j to print the application log, a colleague asked me if the different level of the same logger log could be output to a different file? This one... I told him. Of course, in our production environment using log4j has always been all logger error above level log input to the error log file, convenient system monitoring.

In fact, this is easy to achieve, we are to add 2 appender,appender in logger to set different min and Max level, as follows:

<logger name= "com ..." additivity= "false" >   <appender-ref ref= "normal"/>   <appender-ref ref= " Error "/></logger>

<pre class= "Prettyprint prettyprinted" style= "margin-top:0px"; margin-bottom:10px; padding:5px; BORDER:1PX solid RGB (214, 214, 214); width:549.765625px; border-radius:0px; font-size:12px; Overflow:auto; Background-color:rgb (238, 238, 238); " ><appender name= "Normal" class= "Org.apache.log4j.FileAppender" >   <param name= "file" value= "$ {log}/normal.log "/>   <param name=" append "value=" true "/>   <layout class=" Org.apache.log4j.PatternLayout ">      <param name=" Conversionpattern "value="%m%n "/>   </layout>   <filter>       <param name= "Levelmax" value= "warn"/ >   </filter></appender><appender name= "error" class= "Org.apache.log4j.FileAppender" >   <param name= "file" value= "${log}/error.log"/>   <param name= "append" value= "true "/>   <layout class=" Org.apache.log4j.PatternLayout ">      <param name= "Conversionpattern" value= "%m%n"/>   </layout>    <filter>       <param name= "levelmin" value= "error"/>   </filter> </appender>

Note: In a Web application test environment that uses log4j, we often combine the log4jconfiglistener of spring to implement dynamic update of log. The following example shows a web-fin/log4j.xml change every 6 seconds.

<context-param>         <param-name>log4jConfigLocation</param-name>         <param-value> web-inf/log4j.xml</param-value>     </context-param>       <context-param>         <param-name >log4jRefreshInterval</param-name>         <param-value>6000</param-value>     </ context-param>       <listener>         <listener-class> Org.springframework.web.util.log4jconfiglistener</listener-class>     </listener>  

LOG4J Configuration Practices