web project use log4j output log information

最新推荐文章于 2025-11-24 11:56:09 发布

最新推荐文章于 2025-11-24 11:56:09 发布 · 148 阅读

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#log4j #Web #Struts #iBATIS #Apache

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本文介绍如何在Java Web项目中配置Log4j进行日志记录，包括设置日志级别、输出格式及滚动文件策略，并展示了如何在web.xml中激活Log4j监听器以及在代码中使用Log4j记录日志。

1. set log4j properties file

# For JBoss: Avoid to setup Log4J outside $JBOSS_HOME/server/default/deploy/log4j.xml!
# For all other servers: Comment out the Log4J listener in web.xml to activate Log4J.
log4j.rootLogger=INFO, stdout ,logfile
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d{yyyy/MM/dd HH:mm:ss:SSS} %p [%c] - %m%n

log4j.appender.logfile=org.apache.log4j.RollingFileAppender
#log4j.appender.logfile.File=${TOMCAT_HOME}/webapps/jtosa/WebRoot/logs/jtosaLog.log
log4j.appender.logfile.File=${webapp.root}/WEB-INF/logs/jtosaLog.log
log4j.appender.logfile.MaxFileSize=512KB
# Keep five backup files.
log4j.appender.logfile.MaxBackupIndex=3
# Pattern to output: date priority [category] - message
log4j.appender.logfile.layout=org.apache.log4j.PatternLayout
log4j.appender.logfile.layout.ConversionPattern=%d{yyyy/MM/dd HH:mm:ss:SSS} %p [%c] - %m%n

log4j.category.org.apache.commons.dbcp=INFO
log4j.category.com.ibatis=INFO
log4j.category.org.springframework=INFO
log4j.category.com.jtosa=INFO

2. config project web.xml

<context-param>
        <param-name>log4jConfigLocation</param-name>
        <param-value>WEB-INF/log4j.properties</param-value>
    </context-param>
    <context-param>
        <param-name>log4jRefreshInterval</param-name>
        <param-value>60000</param-value>
    </context-param>
    <listener>
        <listener-class>
            org.springframework.web.util.Log4jConfigListener
        </listener-class>
    </listener>

3. test

private Logger logger = Logger.getLogger(EmployeeAction.class);

logger.info("[用户: " + emp.getEmpNumber() + " 退出系统]");

4. look log file info

2010/04/28 01:10:45:031 INFO [com.jtosa.struts.action.EmployeeAction] - [用户: test 使用密码: test进行登录]
2010/04/28 01:10:47:468 INFO [com.jtosa.struts.action.EmployeeAction] - [用户: test 密码: test 登录失败,原因: 用户或密码有误]
2010/04/28 01:10:53:140 INFO [com.jtosa.struts.action.EmployeeAction] - [用户: test 使用密码: 123 进行登录]
2010/04/28 01:10:53:156 INFO [com.jtosa.struts.action.EmployeeAction] - [用户: test 密码: 123登录成功]
2010/04/28 01:10:59:156 INFO [com.jtosa.struts.action.EmployeeAction] - [用户: test 退出系统]

remark : project use framework(spring + ibatis + struts2 + Extjs)