src目录下新建log4j.properties，并设置编码格式为utf-8

log4j.properties配置文件内容

### 设置级别和目的地(这里多个目的地) ###
log4j.rootLogger = CONSOLE,InfoLog,ErrorLog

### 输出到控制台 ###
log4j.appender.CONSOLE = org.apache.log4j.ConsoleAppender
log4j.appender.CONSOLE.Target = System.out
log4j.appender.CONSOLE.layout = org.apache.log4j.PatternLayout
log4j.appender.CONSOLE.layout.ConversionPattern =  %d{ABSOLUTE} %5p %c{1}:%L [%t:%r]- %m%n

 ### 输出文件info ###
 log4j.logger.infolog = InfoLog
 log4j.appender.InfoLog = org.apache.log4j.DailyRollingFileAppender
 log4j.appender.InfoLog.File = logs/info.log
 log4j.appender.InfoLog.Append = true
 log4j.appender.InfoLog.Threshold = INFO
 log4j.appender.InfoLog.DatePattern = '.'yyyy-MM
 log4j.appender.InfoLog.layout = org.apache.log4j.PatternLayout
 log4j.appender.InfoLog.layout.ConversionPattern = %-d{yyyy-MM-dd HH:mm:ss}  [ %t:%r ] - [ %p ]  %m%n

 ### 输出文件error ###
 
 log4j.logger.errorlog = ErrorLog
 log4j.appender.ErrorLog = org.apache.log4j.DailyRollingFileAppender
 log4j.appender.ErrorLog.File = logs/error.log
 log4j.appender.ErrorLog.Append = true
 log4j.appender.ErrorLog.Threshold = ERROR
 log4j.appender.ErrorLog.DatePattern = '.'yyyy-MM
 log4j.appender.ErrorLog.layout = org.apache.log4j.PatternLayout
 log4j.appender.ErrorLog.layout.ConversionPattern =%-d{yyyy-MM-dd HH\:mm\:ss}  [ %t\:%r ] - [ %p ]  %m%n

注意：日志文件路径

调用MainTest.java

import org.apache.log4j.LogManager;
import org.apache.log4j.Logger;

public class MainTest {

	public static void main(String[] args) {
		Logger logger = LogManager.getLogger(MainTest.class.getName());
		logger.info("我是info信息");
		logger.error("我是error信息");
	}

}

注意：日志等级 

info等级会记录info及以上的内容

erro等级最高，所以只记录error内容

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