log4j的配置全过程

1：在web.xml中配置 <context-param>log4j配置文件的路径</context-param>和log4j监听器<listener>

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
<display-name>SpringMVC</display-name>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.htm</welcome-file>
<welcome-file>index.jsp</welcome-file>
<welcome-file>default.html</welcome-file>
<welcome-file>default.htm</welcome-file>
<welcome-file>default.jsp</welcome-file>
</welcome-file-list>

<context-param>
<param-name>log4jConfigLocation</param-name>
<param-value>/WEB-INF/classes/log4j.properties</param-value>
</context-param>

<listener>
<listener-class>org.springframework.web.util.Log4jConfigListener</listener-class>
</listener>
</web-app>

2：创建log4j.properties文件，名字必须是：log4j.properties（默认的）

log4j.rootLogger=INFO,C,F

log4j.rootLogger=INFO,Console,File

ConsoleAppender

log4j.appender.Console=org.apache.log4j.ConsoleAppender

log4j.appender.Console.Threshold=INFO

log4j.appender.Console.layout=org.apache.log4j.PatternLayout

log4j.appender.Console.layout.ConversionPattern=%-d{yyyy-MM-dd HH:mm:ss,SSS} [%t] [%c] [%p] - %m%n

File

log4j.appender.File=org.apache.log4j.DailyRollingFileAppender

log4j.appender.File.Threshold=INFO

log4j.appender.File.File=catalina.home/logs/{BrokerCode}/2goportal.log

log4j.appender.File.layout=org.apache.log4j.PatternLayout

log4j.appender.File.layout.ConversionPattern=%-d{yyyy-MM-dd HH:mm:ss,SSS} [%t] [%c] [%p] - %m%n

3：在Java类中使用

@Controller

public class UploadAction {

@RequestMapping("log4jTest")
public void log4jTest(){
Logger logger = Logger.getLogger(this.getClass().getName());
logger.info("this is a test for log4j");
}

}