Log4j with spring configuration loading mechanism

Recently used Org.slf4j.Logger, and suddenly found log also have a lot of wins to consider. This is a simple introduction to the configuration bar.

WEB Project under the words, first located in Web-app/web-inf/web.xml this everyone is very familiar with the bar ~ inside the configuration as follows

    <context-param>
        <param-name><span style= "color: #3366ff; Background-color:rgb (204, 204, 204);" >log4jConfigLocation</span></param-name>
        <param-value>/web-inf/conf/log4j.xml</ Param-value>
    </context-param>

<listener>
        <listener-class>org.springframework.web.util.log4jconfiglistener</listener-class >
    </listener>

See above, must be through this loaded, first set the environment variable log4jconfiglocation=/web-inf/conf/log4j.xml then log4jconfiglistener to read load this configuration.

The Log4jconfiglistener code is as follows:

public class Log4jconfiglistener implements Servletcontextlistener {

	@Override public
	void contextinitialized (Servletcontextevent event) {
		log4jwebconfigurer.initlogging (Event.getservletcontext ());
	}

	@Override public
	void contextdestroyed (Servletcontextevent event) {
		log4jwebconfigurer.shutdownlogging ( Event.getservletcontext ());
	}

Then it must be log4jwebconfigurer.initlogging (Event.getservletcontext ()); This one reads.

After following this method, we found that the method passed through a series of read configuration file addresses and finally executed the following method

Log4jconfigurer.initlogging (location);

To understand the following context, you must first get the environment variable log4jconfiglocation=/web-inf/conf/log4j.xml and then read the configuration file.  So the most core method is log4jconfigurer.initlogging (location); So even if it's not a Web project (for example, thrift) directly use the following spring configuration to directly add log4j configuration

<bean id= "Log4jinitializer" class= "Org.springframework.beans.factory.config.MethodInvokingFactoryBean" >
        <property name= "Targetclass"
                  value= "Org.springframework.util.Log4jConfigurer"/>
        <property Name= "Targetmethod" value= "initlogging"/> <property name=
        "Arguments" >
            <list>
                < value>classpath:conf/log4j.xml</value>
            </list>
        </property>
    </bean>

OK, the above is a simple configuration file.