本人專案結構如下圖：特備註意logback.xml必須要改成logback-spring.xml，參看https://docs.spring.io/spring-boot/docs/current/reference/htmlsingle/#boot-features-custom-log-levels：

logback-spring.xml

<?xml version="1.0" encoding="UTF-8"?>
<configuration debug="false"><springProperty scope="context" name="LOG_HOME" source="log.path"/><appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
        <encoder class="ch.qos.logback.classic.encoder.PatternLayoutEncoder"
 
>
<!--格式化輸出：%d表示日期，%thread表示執行緒名，%-5level：級別從左顯示5個字元寬度%msg：日誌訊息，%n是換行符-->
<pattern>%d{yyyy-MM-dd HH:mm:ss.SSS} [%thread] %-5level %logger{50} - %msg%n</pattern>
        </encoder>
    </appender>
<!-- 按照每天生成日誌檔案 -->
<appender name="FILE"  class="ch.qos.logback.core.rolling.RollingFileAppender"
 
>
        <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
<!--日誌檔案輸出的檔名-->
<FileNamePattern>${LOG_HOME}/cloud-desktop.log.%d{yyyy-MM-dd}.log</FileNamePattern>
<!--日誌檔案保留天數-->
<MaxHistory>30</MaxHistory>
        </rollingPolicy>
        <encoder class="ch.qos.logback.classic.encoder.PatternLayoutEncoder">
<!--格式化輸出：%d表示日期，%thread表示執行緒名，%-5level：級別從左顯示5個字元寬度%msg：日誌訊息，%n是換行符-->
<pattern>%d{yyyy-MM-dd HH:mm:ss.SSS} [%thread] %-5level %logger{50} - %msg%n</pattern>
        </encoder>
<!--日誌檔案最大的大小-->
<triggeringPolicy class="ch.qos.logback.core.rolling.SizeBasedTriggeringPolicy">
            <MaxFileSize>30MB</MaxFileSize>
        </triggeringPolicy>
    </appender>
<!--myibatis log configure-->
<logger name="com.apache.ibatis" level="TRACE"/>
    <logger name="java.sql.Connection" level="DEBUG"/>
    <logger name="java.sql.Statement" level="DEBUG"/>
    <logger name="java.sql.PreparedStatement" level="DEBUG"/>
<!-- 日誌輸出級別 -->
<root level="INFO">
        <appender-ref ref="STDOUT" />
        <appender-ref ref="FILE" />
    </root>
</configuration>