第一步：修改pom文件

      <!-- Spring Boot Starter WebFlux (排除默認日志) --><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-webflux</artifactId><version>${spring-boot.version}</version><exclusions><exclusion><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-logging</artifactId></exclusion></exclusions></dependency><!-- 添加Log4j2 Starter --><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-log4j2</artifactId><version>${spring-boot.version}</version></dependency>

第二不：pom添加關鍵依賴

<!-- 添加Log4j2核心依賴 --><dependency><groupId>org.apache.logging.log4j</groupId><artifactId>log4j-api</artifactId><version>${log4j2.version}</version></dependency><dependency><groupId>org.apache.logging.log4j</groupId><artifactId>log4j-core</artifactId><version>${log4j2.version}</version></dependency><dependency><groupId>org.apache.logging.log4j</groupId><artifactId>log4j-slf4j-impl</artifactId><version>${log4j2.version}</version></dependency><dependency><groupId>org.apache.logging.log4j</groupId><artifactId>log4j-jul</artifactId><version>${log4j2.version}</version></dependency>

<!-- 添加Log4j2版本屬性 -->
<log4j2.version>2.17.2</log4j2.version>

<spring-boot.version>2.7.18</spring-boot.version>第三步：在resources文件夾下面新建log4j2.xml文件

<?xml version="1.0" encoding="UTF-8"?>
<Configuration status="WARN" monitorInterval="30" name="log4j2"><Properties><!-- 日志保存路徑 --><Property name="LOG_PATH">logs</Property><!-- 美化后的控制臺日志模式 - 彩色日志 --><Property name="CONSOLE_LOG_PATTERN">%d{yyyy-MM-dd HH:mm:ss.SSS} %highlight{%-5level} [%-20.20t] %style{%logger{36}}{cyan} : %msg%n</Property><!-- 美化后的文件日志模式 --><Property name="FILE_LOG_PATTERN">%d{yyyy-MM-dd HH:mm:ss.SSS} [%-20.20t] %-5level %logger{36} - %msg%n</Property></Properties><Appenders><!-- 彩色控制臺輸出 --><Console name="CONSOLE" target="SYSTEM_OUT"><PatternLayout pattern="${CONSOLE_LOG_PATTERN}" disableAnsi="false"/></Console><!-- DEBUG級別文件輸出 --><RollingFile name="DEBUG_FILE" fileName="${LOG_PATH}/log_debug.log"filePattern="${LOG_PATH}/debug/log-debug-%d{yyyy-MM-dd}-%i.log"><PatternLayout pattern="${FILE_LOG_PATTERN}"/><Filters><ThresholdFilter level="DEBUG" onMatch="ACCEPT" onMismatch="DENY"/></Filters><Policies><TimeBasedTriggeringPolicy interval="1" modulate="true"/><SizeBasedTriggeringPolicy size="10MB"/></Policies><DefaultRolloverStrategy max="15"/></RollingFile><!-- INFO級別文件輸出 --><RollingFile name="INFO_FILE" fileName="${LOG_PATH}/log_info.log"filePattern="${LOG_PATH}/info/log-info-%d{yyyy-MM-dd}-%i.log"><PatternLayout pattern="${FILE_LOG_PATTERN}"/><Filters><ThresholdFilter level="INFO" onMatch="ACCEPT" onMismatch="DENY"/></Filters><Policies><TimeBasedTriggeringPolicy interval="1" modulate="true"/><SizeBasedTriggeringPolicy size="10MB"/></Policies><DefaultRolloverStrategy max="15"/></RollingFile><!-- WARN級別文件輸出 --><RollingFile name="WARN_FILE" fileName="${LOG_PATH}/log_warn.log"filePattern="${LOG_PATH}/warn/log-warn-%d{yyyy-MM-dd}-%i.log"><PatternLayout pattern="${FILE_LOG_PATTERN}"/><Filters><ThresholdFilter level="WARN" onMatch="ACCEPT" onMismatch="DENY"/></Filters><Policies><TimeBasedTriggeringPolicy interval="1" modulate="true"/><SizeBasedTriggeringPolicy size="10MB"/></Policies><DefaultRolloverStrategy max="15"/></RollingFile><!-- ERROR級別文件輸出 --><RollingFile name="ERROR_FILE" fileName="${LOG_PATH}/log_error.log"filePattern="${LOG_PATH}/error/log-error-%d{yyyy-MM-dd}-%i.log"><PatternLayout pattern="${FILE_LOG_PATTERN}"/><Filters><ThresholdFilter level="ERROR" onMatch="ACCEPT" onMismatch="DENY"/></Filters><Policies><TimeBasedTriggeringPolicy interval="1" modulate="true"/><SizeBasedTriggeringPolicy size="10MB"/></Policies><DefaultRolloverStrategy max="15"/></RollingFile><!-- 異步Appender提高性能 --><Async name="ASYNC_DEBUG" bufferSize="1024"><AppenderRef ref="DEBUG_FILE"/></Async><Async name="ASYNC_INFO" bufferSize="1024"><AppenderRef ref="INFO_FILE"/></Async><Async name="ASYNC_WARN" bufferSize="1024"><AppenderRef ref="WARN_FILE"/></Async><Async name="ASYNC_ERROR" bufferSize="1024"><AppenderRef ref="ERROR_FILE"/></Async></Appenders><Loggers><!-- 項目特定包日志級別 --><Logger name="com.jdlt" level="debug" additivity="false"><AppenderRef ref="CONSOLE"/><AppenderRef ref="ASYNC_DEBUG"/><AppenderRef ref="ASYNC_INFO"/><AppenderRef ref="ASYNC_WARN"/><AppenderRef ref="ASYNC_ERROR"/></Logger><!-- 減少Spring框架的日志輸出 --><Logger name="org.springframework" level="info"/><Logger name="org.apache" level="info"/><Logger name="reactor" level="info"/><Root level="info"><AppenderRef ref="CONSOLE"/><AppenderRef ref="ASYNC_DEBUG"/><AppenderRef ref="ASYNC_INFO"/><AppenderRef ref="ASYNC_WARN"/><AppenderRef ref="ASYNC_ERROR"/></Root></Loggers>
</Configuration>