有这么复杂？？
Spring Boot 的默认日志是 SLF4j+Logback
所以只需要配置 logback 就可以了
* application.properties

>logging.config=classpath:logback.xml

* logback.xml

```xml
<?xml version="1.0" encoding="UTF-8"?>
<configuration debug="false">
<property name="LOG_HOME" value="${log.dir:-logs}/"/>
<property name="ENCODER_PATTERN"
value="%d{yyyy-MM-dd HH:mm:ss.SSS} %-5level [%10.10thread] %logger{20} - %msg%n"/>
<contextName>${APP_NAME}</contextName>

<appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
<encoder class="ch.qos.logback.classic.encoder.PatternLayoutEncoder">
<Pattern>${ENCODER_PATTERN}</Pattern>
</encoder>
</appender>

<appender name="INFO" class="ch.qos.logback.core.rolling.RollingFileAppender">
<rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
<fileNamePattern>${LOG_HOME}/info.%d{yyyy-MM-dd}.log</fileNamePattern>
<maxHistory>30</maxHistory>
</rollingPolicy>
<encoder class="ch.qos.logback.classic.encoder.PatternLayoutEncoder">
<pattern>${ENCODER_PATTERN}</pattern>
</encoder>
</appender>

<root>
<level value="INFO"/>
<!--<appender-ref ref="STDOUT"/>-->
<appender-ref ref="INFO"/>
</root>
</configuration>
```