Logback configuration file

You can see , Imported web After dependence , In fact, there is a log module embedded .

		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>

The solution is IDEA Inject DAO It's a mistake , edit Inspection Setting, take Severity from Error Change it to Warning

pattern Parameters

%c / class, Output the fully qualified name of the execution record request . Avoid using , Unless the execution speed does not cause any problems .
%F / file, The output executes the record request Java The source file name . Avoid using , Unless the execution speed does not cause any problems .
%L / line, Output the line number of the execution log request . Avoid using , Unless the execution speed does not cause any problems .
%m / msg / message, Output information provided by the application .
%M / method, Output the method name of the execution log request . Avoid using , Unless the execution speed does not cause any problems .
%r / relative, Output the time from program startup to log creation , In milliseconds .

The optional format modifier is located at "%" And the conversion character

Align left sign , The sign is a minus sign “-”; Then comes the optional minimum width , In decimal notation . If the character is less than the minimum width , Fill it .
Maximum width Modifier , The sign is a dot “.” Add decimal number after . If the character is greater than the maximum width , Cut from the front . Dot notation “.” Add a minus sign to the back “-” Adding numbers , To cut off from the tail .

%-20.40c			#  Minimum width 20,  Maximum width 40,  Cut off if it's not enough ,  Fill in the remaining space , -  yes   Align left 

Some of the parameters

Log information output destination
1.org.apache.log4j.ConsoleAppender（ Console ）
2.FileAppender（ file ）
3.DailyRollingFileAppender（ Generate a log file every day ）
4.RollingFileAppender（ A new file is generated when the file size reaches the specified size ）
5.WriterAppender（ Send log information in stream format to any specified place ）

Format of log information
1.org.apache.log4j.HTMLLayout（HTML Tabular layout ）
2.PatternLayout（ Specify layout mode ）
3.SimpleLayout（ The level of log information and information string ）
4.TTCCLayout（ Log generation time 、 Threads 、 Category and other information ）

My configuration

<?xml version="1.0" encoding="UTF-8"?>
<configuration>
<!--  Defining variables  -->
    <property name="LOG_PATH" value="logs" />
    <property name="LOG_PATTERN" value="%d{yyyy-MM-dd HH:mm:ss.SSS} [%-5level] %-40.40logger{39} : %msg%n" />
<!--  Output to console  -->
    <appender name="Console" class="ch.qos.logback.core.ConsoleAppender">
        <layout class="ch.qos.logback.classic.PatternLayout">
            <pattern>
                %d{yyyy-MM-dd HH:mm:ss} %blue([%thread]) %highlight(%-5level) %green([%-20.40c]).%M\(%F:%L\) >>> %cyan(%msg) %n
            </pattern>
        </layout>
    </appender>

<!--  Generate log files  -->
    <appender name="fileLog" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
            <!-- The file name and save path of the log file -->
            <FileNamePattern>${LOG_PATH}/logback.%d{yyyy-MM-dd}.[%i].log</FileNamePattern>
            <!-- Maximum log file size -->
            <timeBasedFileNamingAndTriggeringPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP">
                <maxFileSize>10MB</maxFileSize>
            </timeBasedFileNamingAndTriggeringPolicy>
            <!-- Log file retention days -->
            <MaxHistory>2</MaxHistory>
        </rollingPolicy>
        <encoder class="ch.qos.logback.classic.encoder.PatternLayoutEncoder">
            <pattern>${LOG_PATTERN}</pattern>
        </encoder>
    </appender>

<!--  Log output level  -->
<!--  At most one can be configured root -->
    <root level="info">
        <appender-ref ref="Console" />
        <appender-ref ref="fileLog" />
    </root>

</configuration>

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