Java--应用场景--log4j

log4j.properties配置

### set log levels ###
log4j.rootLogger = debug,stdout,D,E

### 输出到控制台 ###
log4j.appender.stdout = org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Target = System.out
log4j.appender.stdout.layout = org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern = %-d{yyyy-MM-dd HH:mm:ss}  [ %t:%r ] - [ %p ]  %m%n

### 输出到日志文件 ###
log4j.appender.D = org.apache.log4j.DailyRollingFileAppender
log4j.appender.D.File = logs/log.log
log4j.appender.D.Append = true
log4j.appender.D.Threshold = DEBUG
log4j.appender.D.layout = org.apache.log4j.PatternLayout
log4j.appender.D.layout.ConversionPattern = %-d{yyyy-MM-dd HH:mm:ss}  [ %t:%r ] - [ %p ]  %m%n

### 保存异常信息到单独文件 ###
log4j.appender.E = org.apache.log4j.DailyRollingFileAppender
log4j.appender.E.File = logs/error.log
log4j.appender.E.Append = true
log4j.appender.E.Threshold = ERROR
log4j.appender.E.layout = org.apache.log4j.PatternLayout
log4j.appender.E.layout.ConversionPattern = %-d{yyyy-MM-dd HH:mm:ss}  [ %t:%r ] - [ %p ]  %m%n

Demo

package cn.xiaoxiang.log;

import org.apache.log4j.Logger;
import org.apache.log4j.PropertyConfigurator;

public class Log4jDemo {
	public static void main(String[] args) {
		
		//加载log4j.properties配置文件
		PropertyConfigurator.configure("D:\\workspace\\java\\se\\exercise\\log4j.properties");
		//获取打日志的对像
		Logger log = Logger.getLogger(Log4jDemo.class);
		
		log.debug("debug message");
		log.info("info message");
		log.warn("warn message");
		log.error("error message");
		log.fatal("fatal mesage");
	}

}

参考链接：https://www.cnblogs.com/ywlaker/p/6124067.html

转载于:https://my.oschina.net/u/3323607/blog/2413818