Use the simple idea of log4j

First, we need to create a maven project ( if you do not have maven configuration, see https://www.cnblogs.com/PerZhu/p/10714077.html configuration)

Then start to configure pom.xml

Add dependencies

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

    </dependencies>

Note To create a configuration file log4j.properties file in the resource directory

log4j.properties file contents:

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

### outputs the control information to the lift ###
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

Above ### outputs the log level to DEBUG = E: //logs/debug.log ###
log4j.appender.D = org.apache.log4j.DailyRollingFileAppender
E = log4j.appender.D.File: //JE_Project/logs/debug.log            // log output path Flexible
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

Above ### outputs ERROR logging level to a = E: //logs/error.log ###
log4j.appender.E = org.apache.log4j.DailyRollingFileAppender
log4j.appender.E.File =E://JE_Project/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

Used in the program:

Use the simple idea of log4j

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