SpringBoot整合Spring WebFlux弃用自带的logback,使用log4j2，并启动异步日志处理

第一步：修改pom文件

      <!-- Spring Boot Starter WebFlux (排除默认日志) -->
            <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添加关键依赖

<!-- 添加Log4j2核心依赖 -->
            <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版本属性 -->
<log4j2.version>2.17.2</log4j2.version>

<spring-boot.version>2.7.18</spring-boot.version>

第三步：在resources文件夹下面新建log4j2.xml文件

<?xml version="1.0" encoding="UTF-8"?>
<Configuration status="WARN" monitorInterval="30" name="log4j2">
    <Properties>
        <!-- 日志保存路径 -->
        <Property name="LOG_PATH">logs</Property>

        <!-- 美化后的控制台日志模式 - 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>
        <!-- 彩色控制台输出 -->
        <Console name="CONSOLE" target="SYSTEM_OUT">
            <PatternLayout pattern="${CONSOLE_LOG_PATTERN}" disableAnsi="false"/>
        </Console>

        <!-- DEBUG级别文件输出 -->
        <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级别文件输出 -->
        <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级别文件输出 -->
        <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级别文件输出 -->
        <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>

        <!-- 异步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>
        <!-- 项目特定包日志级别 -->
        <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>

        <!-- 减少Spring框架的日志输出 -->
        <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>