步骤1

resources文件夹下新增logback-spring.xml文件
logback-spring.xml内容如下

<?xml version="1.0" encoding="UTF-8"?>
<configuration  scan="true" scanPeriod="60 seconds" debug="false">
    <contextName>logback</contextName>
    <!--输出到控制台-->
    <appender name="console" class="ch.qos.logback.core.ConsoleAppender">
        <encoder>
            <!--<pattern>%d{HH:mm:ss} [%thread] %-5level %logger{36} - %msg%n</pattern>-->
            <pattern>%d{yyyy-MM-dd HH:mm:ss.SSS} [%thread] %-5level %logger - %msg%n</pattern>
            <!--            <pattern>%d{yyyy-MM-dd HH:mm:ss.SSS} -%5p ${PID:-} [%15.15t] %-30.30C{1.} : %m%n</pattern>-->
        </encoder>
    </appender>

    <!--按天生成日志-->
    <appender name="logFile"  class="ch.qos.logback.core.rolling.RollingFileAppender">
        <Prudent>true</Prudent>
        <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
            <FileNamePattern>
                log/%d{yyyy-MM-dd}/%d{yyyy-MM-dd}.log
            </FileNamePattern>
            <maxHistory>7</maxHistory>
        </rollingPolicy>
        <layout class="ch.qos.logback.classic.PatternLayout">
            <Pattern>
                %d{yyyy-MM-dd HH:mm:ss.SSS} [%thread] %-5level %logger - %msg%n
            </Pattern>
        </layout>
    </appender>

    <root level="INFO">
        <appender-ref ref="console" />
        <appender-ref ref="logFile" />
    </root>

</configuration>

步骤二

运行程序后会发先工程下新增log文件夹