LOG4J PATH environment variable configuration and log4j load configuration

The 1.lo4j log path is read from the environment variable, and the Log4j.xml configuration is as follows:

The specific configuration is as follows: log4j.appender.r.encoding=utf-8log4j.appender.r= Org.apache.log4j.dailyrollingfileappenderlog4j.appender.r.append=true#log4j.appender.r.threshold= Infolog4j.appender.r.file=${log4j.home}/logs/log.loglog4j.appender.r.datepattern= '. ' yyyy-mm-ddlog4j.appender.r.layout=org.apache.log4j.patternlayoutlog4j.appender.r.layout.conversionpattern=%-d{ Yyyy-mm-dd HH\:MM\:SS} [%c]-[%p]%m%n

1.1 Monitoring configuration Web. xml

  < Listener >      < Listener-class >com.jumper.logview.servlet.Log4jlistener</listener-class>    </listener>  

1.2 Monitoring Code

 Public classLog4jlistenerImplementsServletcontextlistener {Final StaticString log4j_home = "Log4j.home"; Final StaticString env_home = "Log4j_home";  Public voidcontextdestroyed (servletcontextevent servletcontextevent) {system.getproperties (). Remove (Log4j_home); }         Public voidcontextinitialized (servletcontextevent servletcontextevent) {String logshome=system.getenv (env_home); if(Logshome = =NULL) {Logshome= System.getproperty ("catalina.home") + "/log4j"; }system.out.println ("*********log4j dir:" +logshome);    System.setproperty (Log4j_home, logshome); }}

Two ways to load 2.log4j

2.1 With Spring load configuration

     <Context-param>        <Param-name>Log4jconfiglocation</Param-name>        <Param-value>/web-inf/classes/config/log4j.properties</Param-value>    </Context-param>    <!--Spring Refreshes the interval of log4j configuration file changes in milliseconds -    <Context-param>        <Param-name>Log4jrefreshinterval</Param-name>        <Param-value>1000000</Param-value>    </Context-param>    <Listener>        <Listener-class>Org.springframework.web.util.Log4jConfigListener</Listener-class>    </Listener>

2.2 Loaded with Serlvet

Importjavax.servlet.ServletException;ImportJavax.servlet.http.HttpServlet;ImportOrg.apache.log4j.PropertyConfigurator; Public classLog4jinitextendsHttpServlet {Private Static Final LongSerialversionuid = 1L;  Public voiddestroy () {Super. Destroy (); }     PublicLog4jinit () {Super(); }    /*** Initialization of the servlet. <br> * *@throwsservletexception * If an error occurs*/     Public voidInit ()throwsservletexception {String file= This. Getinitparameter ("log4j");//read from the Web. XML configuration, the name must be consistent with the Web. XML Configuration        if(File! =NULL) {propertyconfigurator.configure ( This. Getservletcontext (). Getrealpath (file)); }}}web.xml Configuration:<servlet> <servlet-name>Log4jInit</servlet-name> <servlet-class>com.jumper.log4j.log4jinit</servlet-class> <init-param> <param-name>log4j</param-name>//the name is the identity of the bottom path configuration (like key)<param-value>/WEB-INF/classes/config/log4j.properties</param-value>//This is the path to load the log4j configuration file when the container initializes (this is like a value);</init-param> <load-on-startup>1</load-on-startup> </servlet>

LOG4J PATH environment variable configuration and log4j load configuration