1.在pom.xml中引入maven依赖
1 <dependency> 2 <groupId>log4jgroupId> 3 <artifactId>log4jartifactId> 4 <version>1.2.17version> 5 dependency>
2.在resources文件夹下编写log4j.properties配置文件
```
1 #将等级为DEBUG的日志信息输出到console和file这两个目的地,console和file的定义在下面的代码
2 log4j.rootLogger=DEBUG,console,file
3
4 #控制台输出的相关设置
5 log4j.appender.console = org.apache.log4j.ConsoleAppender
6 log4j.appender.console.Target = System.out
7 log4j.appender.console.Threshold=DEBUG
8 log4j.appender.console.layout = org.apache.log4j.PatternLayout
9 log4j.appender.console.layout.ConversionPattern=[%c]-%m%n
10