“来来来，借一步说话”，让前端抓狂的可视化大屏界面。

day74

Mybatis

日志

简介

实现

1. pom.xml中添加log4j的依赖

   <dependency>
     <groupId>log4j</groupId>
     <artifactId>log4j</artifactId>
     <version>1.2.17</version>
   </dependency>

2. 在classpath中添加log4j.properties文件

3. 配置log4j的配置文件内容

   log4j.rootLogger = debug,stdout,D,E
   ​
   ### ???????? ###
   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
   ​
   ### ??DEBUG ????????=DEBUG.log ###
   log4j.appender.D = org.apache.log4j.DailyRollingFileAppender
   log4j.appender.D.File = DEBUG.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
   ​
   ### ??ERROR ????????=error.log ###
   log4j.appender.E = org.apache.log4j.DailyRollingFileAppender
   log4j.appender.E.File =error.log 
   log4j.appender.E.Append = true
   log4j.appender.E.Threshold = ERROR 
   log4j.appender.E.layout = org.apache.log4j.PatternLayout

4. 运行项目之后，同时会在控制台和对应的日志文件中有日志信息的打印

特点