log4j 具體例子

log4j.property

log4j.rootCategory=INFO, stdout, R //只輸出info 級別上的信息
#File config
log4j.appender.R=org.apache.log4j.DailyRollingFileAppender
log4j.appender.R.File=${catalina.home}/PVS_MANAGER_logs/PVS_MANAGER.org tomcat根目錄下 這裏要注意分隔符 Linux 和Windows有區別 最好直接用/
#log4j.appender.R.File=WEB-INF\\logs\\PVS_MANAGER.log
#log4j.appender.R=org.apache.log4j.RollingFileAppender
#log4j.appender.R.File=C:\\logs\\PVS_MANAGER.log
log4j.appender.R.MaxFileSize=1000KB
log4j.appender.R.MaxBackupIndex=0
log4j.appender.R.layout=org.apache.log4j.PatternLayout
log4j.appender.R.layout.ConversionPattern=<%d> <%-5p> <%c> - %m(%F:%M:%L)%n
#Package config
log4j.logger.org.apple=DEBUG
log4j.logger.org.apache.commons=ERROR
log4j.logger.org.springframework=ERROR
log4j.logger.org.apache.struts=ERROR

應用
在要用LOG4J的class裏
static Logger log = Logger.getLogger(ShowChartAction（具體的class）.class.getName());
ShowChartAction sca = new ShowChartAction ();
sca.log.info(要寫入log的內容):