log4j 简单配置

1.将log4j 的jar 置于 lib 下

2.log4j.properties置于 classes 下

3.log4j.properties

log4j.rootCategory=ERROR, file,console

log4j.appender.console=org.apache.log4j.ConsoleAppender
log4j.appender.console.layout=org.apache.log4j.PatternLayout

#log4j.appender.console.layout.ConversionPattern= %t %p - %m %n

log4j.appender.file=org.apache.log4j.RollingFileAppender

log4j.appender.file.File=./example.log // D:\Program Files\netbeans-5.0\enterprise2\jakarta-tomcat-5.5.9\bin

log4j.appender.file.layout=org.apache.log4j.PatternLayout
log4j.appender.file.layout.ConversionPattern= %d{yyyy-MM-dd HH:mm:ss} : %t %p - %m %n
4. import=org.apache.commons.logging.Log;
% 3B import=org.apache.commons.logging.LogFactory;


5.Log logger = LogFactory.getLog(this.getClass());
logger.error("xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx");