springboot會自動幫我們讀取logback的配置檔案，我們實現只需要新增即可

在application中配置日誌檔案的位置

logging:
  config: classpath:conf/logback-dev.xml

配置檔案的內容如下：

<?xml version="1.0" encoding="UTF-8" ?>
<configuration>
    <appender name="consoleLog" class="ch.qos.logback.core.ConsoleAppender">
        <layout class="ch.qos.logback.classic.PatternLayout"
 
>
            <pattern>
%d - %msg%n
            </pattern>
        </layout>
    </appender>
<!--每天生成日誌的類-->
<appender name="fileInfoLog" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <filter class="ch.qos.logback.classic.filter.LevelFilter">
 
            <level>ERROR</level>   <!--過濾掉error的級別-->
<onMatch>DENY</onMatch>
            <onMismatch>ACCEPT</onMismatch>
        </filter>
        <encoder>
            <pattern>
%msg%n
            </pattern>
        </encoder>
<!--
 
滾動策略-->
<rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
<!--路徑-->
<fileNamePattern>H:\ele-web\log/info.%d.log</fileNamePattern>
        </rollingPolicy>
    </appender>
    <appender name="fileErrorLog" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <filter class="ch.qos.logback.classic.filter.ThresholdFilter">
            <level>ERROR</level>  <!--//列印error-->
</filter>
        <encoder>
            <pattern>
%msg%n
            </pattern>
        </encoder>
<!--滾動策略-->
<rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
<!--路徑-->
<fileNamePattern>H:\ele-web\log/error.%d.log</fileNamePattern>
        </rollingPolicy>
    </appender>
    <root level="info">
        <appender-ref ref="consoleLog" />
        <appender-ref ref="fileInfoLog" />
        <appender-ref ref="fileErrorLog" />
    </root>
</configuration>