01.使用log4j

1.pom文件导入

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

2.resource下增加log4j配置文件

### set log levels ###
log4j.rootLogger = INFO,stdout,E

### out console ###
log4j.appender.stdout = org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Target = System.out
log4j.appender.stdout.Threshold = INFO
log4j.appender.stdout.layout = org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern =%d{yyyy-M-d HH\:mm\:ss}%x[%5p](%F\:%L) %m%n

3.代码中使用

public class CommandUtils {

    private final static Logger log =Logger.getLogger(CommandUtils.class);
  
    public static void main(String[] args) throws Exception {
        log.debug("dddd");
    }