log4j学习

1 debug info warn error fatal

2 loger  appender  layout

3 可以指定每个包的log 但好像不能指定每个类的

 

4 实例

 

log4j.logger.net.sx.log4j.debug = debug,appender1
log4j.logger.net.sx.log4j.warn = warn,appender2

log4j.appender.appender1 = org.apache.log4j.ConsoleAppender
log4j.appender.appender1.layout =org.apache.log4j.SimpleLayout

log4j.appender.appender2 = org.apache.log4j.ConsoleAppender
log4j.appender.appender2.layout = org.apache.log4j.PatternLayout
log4j.appender.appender2.layout.ConversionPattern = [%d{yy/MM/dd}]%m(%c)%n

log4j.appender.appender3 = org.apache.log4j.FileAppender
log4j.appender.appender3.File = log.log
log4j.appender.appender3.layout = org.apache.log4j.TTCCLayout

log4j.appender.appender4 = org.apache.log4j.FileAppender
log4j.appender.appender4.File = log.html
log4j.appender.appender4.layout =org.apache.log4j.HTMLLayout

 

5 与common-logging连用，一个接口，一个实现类

6 common-logging查找顺序

7

实例

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

public class Log4jDemo {
	private static Log logger = LogFactory.getLog(Log4jDemo.class);
	
	public static void main(String[] args) {
		logger.debug("test debug");
	}
}