log4j基础

log4jTest.java：

package com.wm.mad.test.log4j;import org.apache.log4j.Level;import org.apache.log4j.Logger;import org.apache.log4j.PropertyConfigurator;public class Log4jTest {public static void main(String[] args) {Logger logger = Logger.getLogger(Log4jTest.class);//DOMConfigurator.configure(Log4jTest.class.getResource("log4j.xml"));PropertyConfigurator.configure("log4j.properties");logger.setLevel(Level.INFO);logger.debug("This is debug.");logger.info("This is an info.");logger.warn("This is a warning.");logger.error("This is an error.");logger.fatal("This is a fatal error.");return ;}}

 

log4j.properties:

 

log4j.rootLogger=INFO,logfilelog4j.appender.logfile=org.apache.log4j.RollingFileAppenderlog3j.appender.logfile.Threshold=INFOlog4j.appender.logfile.File=/backup/log/log4j.loglog4j.appender.logfile.Append=truelog4j.appender.logfile.MaxFileSize=1MBlog4j.appender.logfile.MaxBackupIndex=3log4j.appender.logfile.layout=org.apache.log4j.PatternLayoutlog4j.appender.logfile.layout.ConversionPattern =%d{yyyy-MM-dd HH:mm:ss,SSS} [%t] %-5l - %m %n