官方文章：

logback.xml載入早於application.properties，所以如果你在logback.xml使用了變數時，而恰好這個變數是寫在application.properties時，那麼就會獲取不到，只要改成logback-spring.xml就可以解決。

pom檔案

只繼承了spring-boot-starter-parent原因請看下圖maven繼承樹

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
		 xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>2.1.5.RELEASE</version>
		<relativePath/> <!-- lookup parent from repository -->
	</parent>
	<groupId>com.test</groupId>
	<artifactId>Quartz</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<name>Quartz</name>
	<description>Quartz project for Spring Boot</description>

	<properties>
		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
		<maven.compiler.source>1.8</maven.compiler.source>
		<maven.compiler.target>1.8</maven.compiler.target>
		<java.version>1.8</java.version>
	</properties>


	<build>
		<plugins>
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
			</plugin>
		</plugins>
	</build>

</project>
 

resources下新增logback-spring.xml

以下是我的配置以供參考

<configuration>

	<contextName>spring-boot-demo</contextName>

	<!--各專案日誌儲存統一父目錄->路徑自己設定絕對路徑和相對路徑都可以-->
	<property name="LOG_DIR" value="C:/TEMP" />
	<!--最大儲存天數-->
	<property name="KEEP_MAX_DAY" value="180" />
	<!--總最大儲存檔案大小-->
	<property name="KEEP_TOTAL_MAX_SIZE" value="5GB" />
	<!--單檔案最大儲存檔案大小-->
	<property name="KEEP_FILE_MAX_SIZE" value="100MB" />

	<!--輸出到控制檯-->
	<appender name="console" class="ch.qos.logback.core.ConsoleAppender">
		<encoder>
			<pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger - %msg%n</pattern>
		</encoder>
	</appender>

	<!--輸出到ERROR事件記錄檔案-->
	<appender name="errorFile" class="ch.qos.logback.core.rolling.RollingFileAppender">

		<filter class="ch.qos.logback.classic.filter.LevelFilter">
			<level>ERROR</level>
			<onMatch>ACCEPT</onMatch>
			<onMismatch>DENY</onMismatch>
		</filter>

		<file>${LOG_DIR}/${CONTEXT_NAME}/error/${CONTEXT_NAME}-error.log</file>

		<rollingPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedRollingPolicy">
			<fileNamePattern>${LOG_DIR}/${CONTEXT_NAME}/error/${CONTEXT_NAME}-error-%d{yyyy-MM-dd}.%i.log.gz</fileNamePattern>
			<maxFileSize>${KEEP_FILE_MAX_SIZE}</maxFileSize>
			<maxHistory>${KEEP_MAX_DAY}</maxHistory>
			<totalSizeCap>${KEEP_TOTAL_MAX_SIZE}</totalSizeCap>
		</rollingPolicy>

		<encoder>
			<pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger - %msg%n</pattern>
		</encoder>

	</appender>

	<!--輸出到WARN事件記錄檔案-->
	<appender name="warnFile" class="ch.qos.logback.core.rolling.RollingFileAppender">

		<filter class="ch.qos.logback.classic.filter.LevelFilter">
			<level>WARN</level>
			<onMatch>ACCEPT</onMatch>
			<onMismatch>DENY</onMismatch>
		</filter>

		<file>${LOG_DIR}/${CONTEXT_NAME}/warn/${CONTEXT_NAME}-warn.log</file>

		<rollingPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedRollingPolicy">
			<fileNamePattern>${LOG_DIR}/${CONTEXT_NAME}/warn/${CONTEXT_NAME}-warn-%d{yyyy-MM-dd}.%i.log.gz</fileNamePattern>
			<maxFileSize>${KEEP_FILE_MAX_SIZE}</maxFileSize>
			<maxHistory>${KEEP_MAX_DAY}</maxHistory>
			<totalSizeCap>${KEEP_TOTAL_MAX_SIZE}</totalSizeCap>
		</rollingPolicy>

		<encoder>
			<pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger - %msg%n</pattern>
		</encoder>

	</appender>

	<!--輸出到INFO事件記錄檔案-->
	<appender name="infoFile" class="ch.qos.logback.core.rolling.RollingFileAppender">

		<filter class="ch.qos.logback.classic.filter.LevelFilter">
			<level>INFO</level>
			<onMatch>ACCEPT</onMatch>
			<onMismatch>DENY</onMismatch>
		</filter>

		<file>${LOG_DIR}/${CONTEXT_NAME}/info/${CONTEXT_NAME}-info.log</file>

		<rollingPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedRollingPolicy">
			<fileNamePattern>${LOG_DIR}/${CONTEXT_NAME}/info/${CONTEXT_NAME}-info-%d{yyyy-MM-dd}.%i.log.gz</fileNamePattern>
			<maxFileSize>${KEEP_FILE_MAX_SIZE}</maxFileSize>
			<maxHistory>${KEEP_MAX_DAY}</maxHistory>
			<totalSizeCap>${KEEP_TOTAL_MAX_SIZE}</totalSizeCap>
		</rollingPolicy>

		<encoder>
			<pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger - %msg%n</pattern>
		</encoder>

	</appender>

	<logger name="org.springframework.jdbc.core" level="debug" additivity="false">
		<appender-ref ref="console" />
	</logger>

	<logger name="com.springboot.web.dynamic_debug" level="debug" additivity="false">
		<appender-ref ref="console" />
	</logger>


	<root level="info">
		<appender-ref ref="console" />
		<appender-ref ref="errorFile" />
		<appender-ref ref="warnFile" />
		<appender-ref ref="infoFile" />
	</root>

</config