Log4j use

Configuration and use log4j

（1）mybatis Core profile import dependency

<!-- https://mvnrepository.com/artifact/log4j/log4j -->
<dependency>
    <groupId>log4j</groupId>
    <artifactId>log4j</artifactId>
    <version>1.2.17</version>
</dependency>

（2） To configure log4j.properties

###  Set up ###
# Rank as debug Log file output to console console、stdout   file file
log4j.rootLogger = DEBUG,stdout,file

###  Output information to console  ###
log4j.appender.stdout = org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Target = System.out
log4j.appender.stdout.Threshold = DEBUG
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

# File output related settings 
log4j.appender.file = org.apache.log4j.DailyRollingFileAppender
log4j.appender.file.File = ./log/lin.log
log4j.appender.file.Append = true
log4j.appender.file.MaxFileSize = 10mb
log4j.appender.file.Threshold = DEBUG 
log4j.appender.file.layout = org.apache.log4j.PatternLayout
log4j.appender.file.layout.ConversionPattern = %-d{yyyy-MM-dd HH:mm:ss}  [ %t:%r ] - [ %p ]  %m%n

# Log output level 
log4j.logger.org.mybatis=DEBUG
log4j.logger.java.sql=DEBUG
log4j.logger.java.sql.Statement=DEBUG
log4j.logger.java.sql.ResultSet=DEBUG
log4j.logger.java.sql.PreparedStatement=DEBUG

（3）mapper To configure log4j For the implementation of log

    <settings>
        <setting name="logImpl" value="LOG4J"/>
    </settings>

（4） Use

Easy to use

1. In use log4j Import package in class

import org.apache.log4j.Logger;

2. Log object , The parameter is of the current class class

    static Logger logger=Logger.getLogger(UserMapperTest.class);

3. The level of logging

    @Test
    public void testLog4j(){
    
        logger.debug("debug: Into the testLog4j");
        logger.error("error: Into the testLog4j");
        logger.info("info: Into the testLog4j");
    }