J2EE工程+Log4j日志_j2ee添加日志-优快云博客

本文链接：https://blog.youkuaiyun.com/xiaxiaorui2003/article/details/6481426

本文介绍如何在Web应用中配置Log4j进行日志记录。包括在WEB.XML中注册Log4j初始化Servlet，创建log4j.properties配置文件，加载必要的jar包，以及在业务代码中使用Log4j记录日志。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

1.首先在WEB.XML中加上

view plaincopy to clipboardprint?

<servlet>
    　　<servlet-name>log4j-init</servlet-name>
    　　<servlet-class>com.koal.ceshi.Log4jInit</servlet-class>
    　　<init-param>
        　　<param-name>log4j-init-file</param-name>
        　　<param-value>/WEB-INF/log4j.properties</param-value>
    　　</init-param>
    　　<load-on-startup>1</load-on-startup>
　       </servlet>


   <servlet>
  　　<servlet-name>log4j-init</servlet-name>
  　　<servlet-class>com.koal.ceshi.Log4jInit</servlet-class>
  　　<init-param>
   　　<param-name>log4j-init-file</param-name>
   　　<param-value>/WEB-INF/log4j.properties</param-value>
  　　</init-param>
  　　<load-on-startup>1</load-on-startup>
　　  </servlet>

2. 在/WEB-INF/log4j.properties目录下创建log4j.properties，内容为

view plaincopy to clipboardprint?

log4j.rootLogger = DEBUG, stdout, R
log4j.rootCategory=INFO, stdout , R

log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=[QC] %p [%t] %C.%M(%L) | %m%n

log4j.appender.R=org.apache.log4j.DailyRollingFileAppender
log4j.appender.R.File=./log4j.log
log4j.appender.R.layout=org.apache.log4j.PatternLayout
log4j.appender.R.layout.ConversionPattern=%d-[TS] %p %t %c - %m%n

log4j.logger.com.neusoft=DEBUG
log4j.logger.com.opensymphony.oscache=ERROR
log4j.logger.net.sf.navigator=ERROR
log4j.logger.org.apache.commons=ERROR
log4j.logger.org.apache.struts=WARN
log4j.logger.org.displaytag=ERROR
log4j.logger.org.springframework=DEBUG
log4j.logger.com.ibatis.db=WARN
log4j.logger.org.apache.velocity=FATAL

log4j.logger.com.canoo.webtest=WARN

log4j.logger.org.hibernate.ps.PreparedStatementCache=WARN
log4j.logger.org.hibernate=DEBUG
log4j.logger.org.logicalcobwebs=WARN

log4j.rootLogger = DEBUG, stdout, R
log4j.rootCategory=INFO, stdout , R

log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=[QC] %p [%t] %C.%M(%L) | %m%n

log4j.appender.R=org.apache.log4j.DailyRollingFileAppender
log4j.appender.R.File=./log4j.log
log4j.appender.R.layout=org.apache.log4j.PatternLayout
log4j.appender.R.layout.ConversionPattern=%d-[TS] %p %t %c - %m%n

log4j.logger.com.neusoft=DEBUG
log4j.logger.com.opensymphony.oscache=ERROR
log4j.logger.net.sf.navigator=ERROR
log4j.logger.org.apache.commons=ERROR
log4j.logger.org.apache.struts=WARN
log4j.logger.org.displaytag=ERROR
log4j.logger.org.springframework=DEBUG
log4j.logger.com.ibatis.db=WARN
log4j.logger.org.apache.velocity=FATAL

log4j.logger.com.canoo.webtest=WARN

log4j.logger.org.hibernate.ps.PreparedStatementCache=WARN
log4j.logger.org.hibernate=DEBUG
log4j.logger.org.logicalcobwebs=WARN

3. 在lib目录下加载

log4j-1.2.8.jar 和 commons-logging.jar

4. 在servlet或者action中加上

view plaincopy to clipboardprint?
private static Log log =
    LogFactory.getLog(SRTHPrepareData.class.getName());
private static Log log =
  LogFactory.getLog(SRTHPrepareData.class.getName());

然后在需要记录日志的地方加上类似

view plaincopy to clipboardprint?
log.error("数据为空");
log.error("数据为空");

5 然后运行之后到log4j.log文件中去查看日志

本文来自优快云博客，转载请标明出处：http://blog.youkuaiyun.com/xiaxiaorui2003/archive/2009/08/20/4466536.aspx