Log4j配置

1、log4j包导入

百度网盘：https://pan.baidu.com/s/1OEqbE1-2jzECbzBPpY1_lA

密码：f4w0

2、Src同级创建并设置log4j.properties

### 设置###
log4j.rootLogger = debug,stdout,D,E

### 输出信息到控制台 ###
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 = [%-5p] %d{yyyy-MM-dd HH:mm:ss,SSS} method:%l%n%m%n

### 输出DEBUG 级别以上的日志到=D://logs/error.log ###
log4j.appender.D = org.apache.log4j.DailyRollingFileAppender
log4j.appender.D.File = D://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

### 输出ERROR 级别以上的日志到=D://logs/error.log ###
log4j.appender.E = org.apache.log4j.DailyRollingFileAppender
log4j.appender.E.File =D://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

3、日志内容设置

private static Logger logger = Logger.getLogger(MyPerson.class);  
/** 
 * @param args 
 */  
public static void main(String[] args) {  
    // System.out.println("This is println message.");  

    // 记录debug级别的信息  
    logger.debug("This is debug message.");  
    // 记录info级别的信息  
    logger.info("This is info message.");  
    // 记录error级别的信息  
    logger.error("This is error message.");  
}  

4、输出结果和文件查看