<dependency> 
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
<exclusions><!-- 去掉springboot默認配置 -->
<exclusion> 
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-logging</artifactId>
</exclusion> 
</exclusions> 
</dependency> 
<dependency> <!-- 引入log4j2依賴 -->
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-log4j2</artifactId>
</dependency> 

<?xml version="1.0" encoding="UTF-8"?>
<!-- Configuration后面的status，這個用于設(shè)置log4j2自身內(nèi)部的信息輸出，可以不設(shè)置，當設(shè)置成trace時，你會看到log4j2內(nèi)部各種詳細輸出-->
<!-- monitorInterval：Log4j能夠自動檢測修改配置 文件和重新配置本身，設(shè)置間隔秒數(shù)-->
<configuration status="WARN">
<Properties>
<!--常用變量配置 供下文中使用-->
<property name="APP_NAME">項目名稱</property>
<property name="LOGGER_LEVEL">INFO</property>
<!--日志路徑 對應(yīng)服務(wù)器路徑-->
<property name="LOGGER_PATH">/data/logs</property> 
<Property name="LOG_HOME">${LOGGER_PATH}/${APP_NAME}</Property>
<!--文件大小-->
<Property name="FILE_SIZE">10M</Property>
<!--日志格式-->
<Property name="log_pattern">%d{yyyy-MM-dd HH:mm:ss.SSS} [%thread] [%X{traceId}] %-5level %logger{36} - %msg%n</Property>
<!--日志文件命名格式-->
<Property name="rolling_file_name">-%d{yyyy-MM-dd}.%i.zip</Property>
<!--日志留存最大文件數(shù)-->
<Property name="rollover_strategy_max">30</Property>
<Property name="LOG_HOME_PROJECT">${LOG_HOME}/${APP_NAME}-project</Property>
<Property name="LOG_HOME_PROJECT_ERROR">${LOG_HOME}/${APP_NAME}-project-error</Property>
<Property name="LOG_HOME_SQL">${LOG_HOME}/${APP_NAME}-sql</Property>
</Properties>
<appenders>
<!--控制臺打印 及格式-->
<Console name="Console" target="SYSTEM_OUT">
<PatternLayout pattern="${log_pattern}" />
</Console>
<!--定義rolling（） 供下文使用-->
<RollingRandomAccessFile name="projectRolling"
fileName="${LOG_HOME_PROJECT}.log"
filePattern="${LOG_HOME_PROJECT}${rolling_file_name}"
immediateFlush="false" append="true">
<PatternLayout>
<Pattern>${log_pattern}</Pattern>
<Charset>UTF-8</Charset>
</PatternLayout>
<Policies>
<!--滾動規(guī)則 時間或者文件大小 滾動后將按照filePattern命名-->
<!--interval屬性用來指定多久滾動一次，默認是1 hour-->
<TimeBasedTriggeringPolicy interval="24"/>
<SizeBasedTriggeringPolicy size="${FILE_SIZE}"/>
</Policies>
<DefaultRolloverStrategy max="${rollover_strategy_max}" />
</RollingRandomAccessFile>
<RollingRandomAccessFile name="projectErrorRolling"
fileName="${LOG_HOME_PROJECT_ERROR}.log"
filePattern="${LOG_HOME_PROJECT_ERROR}${rolling_file_name}"
immediateFlush="false" append="true">
<Filters>
<!-- 只輸出level及以上級別的信息（onMatch），其他的直接拒絕（onMismatch）可以使用多個ThresholdFilter 達到精準過濾某個級別的日志-->
<ThresholdFilter level="${LOGGER_LEVEL}" onMatch="ACCEPT" onMismatch="DENY" />
</Filters>
<PatternLayout>
<Pattern>${log_pattern}</Pattern>
<Charset>UTF-8</Charset>
</PatternLayout>
<Policies>
<SizeBasedTriggeringPolicy size="${FILE_SIZE}"/>
</Policies>
<DefaultRolloverStrategy max="${rollover_strategy_max}" />
</RollingRandomAccessFile>
</RollingRandomAccessFile>
<RollingRandomAccessFile name="sqlRolling"
fileName="${LOG_HOME_SQL}.log"
filePattern="${LOG_HOME_SQL}${rolling_file_name}"
immediateFlush="false" append="true">
<PatternLayout>
<Pattern>${log_pattern}</Pattern>
<Charset>UTF-8</Charset>
</PatternLayout>
<Policies>
<SizeBasedTriggeringPolicy size="${FILE_SIZE}"/>
</Policies>
<DefaultRolloverStrategy max="${rollover_strategy_max}" />
</RollingRandomAccessFile>
</appenders>
<!--Logger節(jié)點用來單獨指定日志的形式，比如要為指定包下的class指定不同的日志級別等。-->
<loggers>
<!--異步日志 區(qū)別于普通使用的logger root 搭配-->
<!--name 為包名 對應(yīng)配置日志輸出等級level -->
<!--若是additivity設(shè)為false，則 子Logger 只會在自己的appender里輸出，而不會在 父Logger 的appender里輸出。-->
<!--將org.springframework包下的日志打印到Console控制臺，projectRolling文件，projectErrorRolling（error級別單獨一個文件）-->
<AsyncLogger name="org.springframework" level="${LOGGER_LEVEL}" additivity="false">
<appender-ref ref="Console"/>
<appender-ref ref="projectRolling"/>
<appender-ref ref="projectErrorRolling"/>
</AsyncLogger>
<AsyncLogger name="com.alibaba.dubbo" level="${LOGGER_LEVEL}" additivity="false">
<appender-ref ref="Console"/>
<appender-ref ref="projectRolling"/>
<appender-ref ref="projectErrorRolling"/>
</AsyncLogger>
<AsyncLogger name="druid.sql" level="${LOGGER_LEVEL}" additivity="false">
<appender-ref ref="Console"/>
<appender-ref ref="sqlRolling"/>
</AsyncLogger>
<AsyncLogger name="org.mybatis" level="${LOGGER_LEVEL}" additivity="false">
<appender-ref ref="Console"/>
<appender-ref ref="sqlRolling"/>
</AsyncLogger>
<AsyncLogger name="com.項目包名" level="${LOGGER_LEVEL}" additivity="false">
<appender-ref ref="Console"/>
<appender-ref ref="projectRolling"/>
<appender-ref ref="projectErrorRolling"/>
</AsyncLogger>
<AsyncRoot level="${LOGGER_LEVEL}">
<appender-ref ref="Console"/>
<appender-ref ref="projectRolling" />
<appender-ref ref="projectErrorRolling" />
</AsyncRoot>
</loggers>
</configuration>

public class ContextFilter implements Filter {
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        String traceId = UUID.randomUUID().toString().replaceAll("-", "");
// org.slf4j.MDC 
        MDC.put(CommonConsts.TRACE_ID_LOG, traceId);// 用來給日志文件使用
// org.apache.logging.log4j.ThreadContext
    ThreadContext.put(CommonConsts.TRACE_ID_LOG, traceId); //經(jīng)測試，這兩行都可行。
    filterChain.doFilter(servletRequest, servletResponse);
}

package com.howtodoinjava.log4j2.examples;
import java.util.UUID;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.apache.logging.log4j.ThreadContext;
 
public class Log4j2HelloWorldExample {
    private static final Logger LOGGER = LogManager.getLogger(Log4j2HelloWorldExample.class.getName());
    public static void main(String[] args) {
        //Add context information
        ThreadContext.put("id", UUID.randomUUID().toString());
        ThreadContext.put("ipAddress", "192.168.21.9");
 
        LOGGER.debug("Debug Message Logged !!");
        LOGGER.info("Info Message Logged !!");
        LOGGER.debug("Another Debug Message !!");
 
        //Clear the map
        ThreadContext.clearMap();
		
        LOGGER.debug("Thread Context Cleaned up !!");
        LOGGER.debug("Log message with no context information !!");
    }
}