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[idea] use of log

2022-04-22 21:58:00 【Li ear】

In the use of MyBatis When , Actually MyBatis The framework will print some necessary log information , During the development phase, this log information is useful for

We analyze the problem , Understanding the execution of code is particularly helpful ;

Including after the project goes online , We can also collect the error log of the project into the file ;

So we use a special log system to deal with .

The logging system is a tool

Copy coordinates

<!-- log start -->
<!--  The specific implementation of log   -->
<dependency>
    <groupId>log4j</groupId>
    <artifactId>log4j</artifactId>
    <version>1.2.12</version>
</dependency>

<!--   Interface   -->
<dependency>
    <groupId>org.slf4j</groupId>
    <artifactId>slf4j-api</artifactId>
    <version>1.6.6</version>
</dependency>

<!--  Intermediate transformation jar package  -->
<dependency>
    <groupId>org.slf4j</groupId>
    <artifactId>slf4j-log4j12</artifactId>
    <version>1.6.6</version>
</dependency>

Copy log4j.properties To project

## Set the way of logging to the console 
log4j.appender.std=org.apache.log4j.ConsoleAppender
log4j.appender.std.Target=System.err
log4j.appender.std.layout=org.apache.log4j.PatternLayout
log4j.appender.std.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss} %5p %c{1}:%L - %m%n

## Set the way of logging to file 
log4j.appender.file=org.apache.log4j.FileAppender
log4j.appender.file.File=mylog.txt
log4j.appender.file.layout=org.apache.log4j.PatternLayout
log4j.appender.file.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L - %m%n

## The level of log output , And configuration record scheme 
log4j.rootLogger= debug,std,file