log4j配置实例

log4j.rootLogger=debug,console,dailyFile
log4j.logger.debuglog=debug,debuglog
log4j.logger.infolog=debug,infolog
log4j.logger.errorlog=debug,errorlog
log4j.additivity.org.apache=true

# console
log4j.appender.console=org.apache.log4j.ConsoleAppender
log4j.appender.console.Threshold=debug
log4j.appender.console.ImmediateFlush=true
log4j.appender.console.Target=System.err
log4j.appender.console.layout=org.apache.log4j.PatternLayout
log4j.appender.console.layout.ConversionPattern=[%-5p] %d(%r) --> [%t] %l: %m %x %n


# logFile
log4j.appender.dailyFile=org.apache.log4j.DailyRollingFileAppender
log4j.appender.dailyFile.Threshold=DEBUG
log4j.appender.dailyFile.ImmediateFlush=true
log4j.appender.dailyFile.Append=true
log4j.appender.dailyFile.File=D\:\\work\\struts2\\WebRoot\\log\\root.log
log4j.appender.dailyFile.DatePattern='.'yyyy-MM-dd-a
log4j.appender.dailyFile.layout=org.apache.log4j.PatternLayout
log4j.appender.dailyFile.layout.ConversionPattern=[%-5p] %d(%r) --> [%t] %l\: %m %x %n

# debuglog
log4j.appender.debuglog=org.apache.log4j.DailyRollingFileAppender
log4j.appender.debuglog.Threshold=DEBUG
log4j.appender.debuglog.ImmediateFlush=true
log4j.appender.debuglog.Append=true
log4j.appender.debuglog.File=D\:\\work\\struts2\\WebRoot\\log\\debug.log
log4j.appender.debuglog.DatePattern='.'yyyy-MM-dd-a
log4j.appender.debuglog.layout=org.apache.log4j.PatternLayout
log4j.appender.debuglog.layout.ConversionPattern=[%-5p] %d(%r) --> [%t] %l\: %m %x %n

# infolog
log4j.appender.infolog=org.apache.log4j.DailyRollingFileAppender
log4j.appender.infolog.Threshold=INFO
log4j.appender.infolog.ImmediateFlush=true
log4j.appender.infolog.Append=true
log4j.appender.infolog.File=D\:\\work\\struts2\\WebRoot\\log\\info.log
log4j.appender.infolog.DatePattern='.'yyyy-MM-dd-a
log4j.appender.infolog.layout=org.apache.log4j.PatternLayout
log4j.appender.infolog.layout.ConversionPattern=[%-5p] %d(%r) --> [%t] %l\: %m %x %n

# errorlog
log4j.appender.errorlog=org.apache.log4j.DailyRollingFileAppender
log4j.appender.errorlog.Threshold=ERROR
log4j.appender.errorlog.ImmediateFlush=true
log4j.appender.errorlog.Append=true
log4j.appender.errorlog.File=D\:\\work\\struts2\\WebRoot\\log\\error.log
log4j.appender.errorlog.DatePattern='.'yyyy-MM-dd-a
log4j.appender.errorlog.layout=org.apache.log4j.PatternLayout
log4j.appender.errorlog.layout.ConversionPattern=[%-5p] %d(%r) --> [%t] %l\: %m %x %n

工具类：

package util;

import org.apache.log4j.Logger;

public class Slog {
	
	private static Logger rootLogger;
	
	private static Logger myLogger;

	
	static{
		loadLogger();
	}
	
	private static void loadLogger(){
		rootLogger=Logger.getRootLogger();
	}
	
	public static void debug(Object message){
		if(rootLogger.isDebugEnabled()){
			rootLogger.debug(message);
		}else{
			rootLogger.error("日志级别设置错误");
		}
	}
	
	public static void info(Object message){
		if(rootLogger.isInfoEnabled()){
			rootLogger.info(message);
		}else{
			rootLogger.error("日志级别设置错误");
		}
	}
	
	public static void error(Object message){
		rootLogger.error(message);
	}
	
	public static void error(Object message,Exception ex){
		rootLogger.error(message,ex);
	}
	
	/**后面是myLog*/
	
	public static void debug(Object message,String logName){
		myLogger=Logger.getLogger(logName);
		if(myLogger.isDebugEnabled()){
			myLogger.debug(message);
		}else{
			myLogger.error("日志界别设置错误");
		}
	}
	
	public static void info(Object message,String logName){
		myLogger=Logger.getLogger(logName);
		if(myLogger.isInfoEnabled()){
			myLogger.info(message);
		}else{
			myLogger.error("日志级别设置错误");
		}
	}
	
	public static void error(Object message,String logName){
		myLogger=Logger.getLogger(logName);
		myLogger.error(message);
	}
	
	public static void error(Object message,String logName,Exception ex){
		myLogger=Logger.getLogger(logName);
		myLogger.error(message,ex);
	}
	
	
	/**
		测试方法
	 */
	public static void main(String[] args) {
		Slog.debug("你好debug","debuglog");
		Slog.info("你好info","infolog");
		Slog.error("你好error","errorlog");
		
		Slog.debug("rootdebug");
		Slog.info("rootinfo");
		Slog.error("rooterror");
	}
}