一、仅LOG4J2，只需要加上这个包即可。

1.在POM.XML中引入如下包。

<dependency><groupId>org.apache.logging.log4j</groupId><artifactId>log4j-core</artifactId><version>2.12.1</version>
</dependency>

<dependency><groupId>org.apache.logging.log4j</groupId><artifactId>log4j-api</artifactId><version>2.12.1</version>
</dependency>

2.在resource目录下新建log4j2.xml,在log4j初始化context时会自动寻找resource下的log4j2.xml文件进行配置，其它配置无效。(log4j2.properties,lo4j2.json,log4j2.yaml这几个都可以)

<?xml version="1.0" encoding="UTF-8"?>
<!--日志级别以及优先级排序: OFF > FATAL > ERROR > WARN > INFO > DEBUG > TRACE > ALL -->
<!--自定义命名格式：%d：发生时间，%d{yyyy-MM-dd HH:mm:ss,SSS}，输出类似：2020-02-20 22:10:28,921%F：输出所在的类文件名%t：线程名称%p：日志级别%c：日志消息所在类名%m：消息内容%M：输出所在函数名%x: 输出和当前线程相关联的NDC(嵌套诊断环境),尤其用到像java servlets这样的多客户多线程的应用中。%l：执行的函数名(类名称:行号）com.core.LogHelper.aroundService(LogHelper.java:32)%n：换行%i：从1开始自增数字%-5level：输出日志级别，-5表示左对齐并且固定输出5个字符，如果不足在右边补0“${sys:user.home}”是HOME目录 如:C:\Users\heave, 此处指定任意目录如：D:\logs
-->
<!--设置log4j2自身log级别为warn，每间隔30秒数自动检测配置是否发生修改，并重新配置-->
<configuration status="DEBUG" monitorInterval="30"><Properties><!-- 日志显示模板,显示内容的格式如下 --><!-- [21:55:33:047] [INFO] - org.apache.juli.logging.DirectJDKLog.log(DirectJDKLog.java:173) - Initializing Spring embedded WebApplicationContext --><Property name="log_pattern" value="[%d{HH:mm:ss:SSS}] [%p] - %l - %m%n"/><!-- 保存日志文件目录 --><!--<Property name="file_path" value="${sys:user.home}/logs"/>--><Property name="file_path" value="./logs"/><!-- 日志文件的最大容量，超过该值就进行备份 --><Property name="file_max_size" value="30MB"/><!-- 备份的文件夹名称 如下为：2020-02 --><Property name="backup_folder" value="$${date:yyyy-MM}"/><!-- 备份文件的后缀，日志文件超过file_max_size会备份到filePattern指定的目录下 --><Property name="backup_file_suffix" value="-%d{yyyy-MM-dd}-%i.log"/></Properties><!--定义appender--><appenders><!--控制台的输出配置--><console name="Console" target="SYSTEM_OUT"><!-- 设置控制台只输出info及以上级别的信息(onMatch),其他的直接拒绝(onMismatch) --><ThresholdFilter level="DEBUG" onMatch="ACCEPT" onMismatch="DENY"/><!--输出日志的格式--><PatternLayout pattern="${log_pattern}"/></console><!-- 所有的日志信息会打印到此文件中，append=false每次启动程序会自动清空 --><!--<File name="all" fileName="${file_path}/all.log" append="true">--><!--<PatternLayout pattern="${log_pattern}"/>--><!--</File>--><!--该RollingFile存储INFO级别的日志，默认存储到 fileName 文件中超过SizeBasedTriggeringPolicy的设定值，则存储到 filePattern 文件中--><RollingFile name="RollingFileDebug" fileName="${file_path}/debug.log"filePattern="${file_path}/${backup_folder}/debug${backup_file_suffix}"><!--控制台只输出level及以上级别的信息（onMatch），其他的直接拒绝（onMismatch）--><ThresholdFilter level="DEBUG" onMatch="ACCEPT" onMismatch="DENY"/><!-- 写入日志文件的模板 --><PatternLayout pattern="${log_pattern}"/><Policies><TimeBasedTriggeringPolicy/><SizeBasedTriggeringPolicy size="${file_max_size}"/></Policies><!-- DefaultRolloverStrategy属性如不设置，则默认为最多同一文件夹下7个文件，超过该数量，会滚动删除前面的记录 --><DefaultRolloverStrategy max="20"/></RollingFile><RollingFile name="RollingFileInfo" fileName="${file_path}/info.log"filePattern="${file_path}/${backup_folder}/info${backup_file_suffix}"><!--控制台只输出level及以上级别的信息（onMatch），其他的直接拒绝（onMismatch）--><ThresholdFilter level="INFO" onMatch="ACCEPT" onMismatch="DENY"/><!-- 写入日志文件的模板 --><PatternLayout pattern="${log_pattern}"/><Policies><TimeBasedTriggeringPolicy/><SizeBasedTriggeringPolicy size="${file_max_size}"/></Policies><!-- DefaultRolloverStrategy属性如不设置，则默认为最多同一文件夹下7个文件，超过该数量，会滚动删除前面的记录 --><DefaultRolloverStrategy max="20"/></RollingFile><RollingFile name="RollingFileWarn" fileName="${file_path}/warn.log"filePattern="${file_path}/${backup_folder}/warn${backup_file_suffix}"><ThresholdFilter level="WARN" onMatch="ACCEPT" onMismatch="DENY"/><PatternLayout pattern="${log_pattern}"/><Policies><TimeBasedTriggeringPolicy/><SizeBasedTriggeringPolicy size="${file_max_size}"/></Policies></RollingFile><RollingFile name="RollingFileError" fileName="${file_path}/error.log"      filePattern="${file_path}/${backup_folder}/error${backup_file_suffix}"><ThresholdFilter level="ERROR" onMatch="ACCEPT" onMismatch="DENY"/><PatternLayout pattern="${log_pattern}"/><Policies><TimeBasedTriggeringPolicy/><SizeBasedTriggeringPolicy size="${file_max_size}"/></Policies></RollingFile></appenders><!-- 只有定义了logger并使用appender-ref，appender才会生效 --><loggers><!--过滤掉spring和hibernate的一些无用的debug信息--><logger name="org.springframework" level="TRACE"/><logger name="org.mybatis" level="INFO"><!-- 添加如下设置，控制台会再打印一次 --><AppenderRef ref="Console"/></logger><root level="DEBUG"><appender-ref ref="Console"/><appender-ref ref="RollingFileDebug"/><appender-ref ref="RollingFileInfo"/><appender-ref ref="RollingFileWarn"/><appender-ref ref="RollingFileError"/></root></loggers></configuration>

3.1.在log4j2-core中会强制写死在resource目录下寻找带log4j2的配置。由spring-jcl包中的apache通用日志库调用到LogFactory.getLog(Class<?> clazz)

Log4jAdapter.createLog(name)，

org.apache.commons.logging.LogAdapter
public static Log createLog(String name) {switch (logApi) {case LOG4J:return Log4jAdapter.createLog(name);case SLF4J_LAL:return Slf4jAdapter.createLocationAwareLog(name);case SLF4J:return Slf4jAdapter.createLog(name);default:// Defensively use lazy-initializing adapter class here as well since the// java.logging module is not present by default on JDK 9. We are requiring// its presence if neither Log4j nor SLF4J is available; however, in the// case of Log4j or SLF4J, we are trying to prevent early initialization// of the JavaUtilLog adapter - e.g. by a JVM in debug mode - when eagerly// trying to parse the bytecode for all the cases of this switch clause.return JavaUtilAdapter.createLog(name);}}

最后调用到Log4jAdapter适配器的创建LOG。

private static class Log4jAdapter {public static Log createLog(String name) {return new Log4jLog(name);}}

上述中间会调用log4j2-api中的logcontext 进行初始化。

private static final LoggerContext loggerContext =LogManager.getContext(Log4jLog.class.getClassLoader(), false);private final ExtendedLogger logger;public Log4jLog(String name) {LoggerContext context = loggerContext;if (context == null) {// Circular call in early-init scenario -> static field not initialized yetcontext = LogManager.getContext(Log4jLog.class.getClassLoader(), false);}this.logger = context.getLogger(name);}

最终会调用到log4j2-core中的org.apache.logging.log4j.core.LoggerContext.reconfigure接口读取log4j2配置进行初始化。

log4j2内部的日志输出器为org.apache.logging.log4j.spi.AbstractLogger.logMessageSafely，可以在这里面进行断点，查看日志加载流程。以下是加载流程。

2021-07-13 16:44:15,619 RMI TCP Connection(3)-127.0.0.1 DEBUG Apache Log4j Core 2.12.1 initializing configuration XmlConfiguration[location=E:\web\source\zhaocaifeng\coding\newday\oldday\target\oldday\WEB-INF\classes\log4j2.xml]
2021-07-13 16:44:15,627 RMI TCP Connection(3)-127.0.0.1 DEBUG Installed 1 script engine
2021-07-13 16:44:15,946 RMI TCP Connection(3)-127.0.0.1 DEBUG Oracle Nashorn version: 1.8.0_161, language: ECMAScript, threading: Not Thread Safe, compile: true, names: [nashorn, Nashorn, js, JS, JavaScript, javascript, ECMAScript, ecmascript], factory class: jdk.nashorn.api.scripting.NashornScriptEngineFactory
2021-07-13 16:44:15,947 RMI TCP Connection(3)-127.0.0.1 DEBUG PluginManager 'Core' found 118 plugins
2021-07-13 16:44:15,947 RMI TCP Connection(3)-127.0.0.1 DEBUG PluginManager 'Level' found 0 plugins
2021-07-13 16:44:15,956 RMI TCP Connection(3)-127.0.0.1 DEBUG Building Plugin[name=property, class=org.apache.logging.log4j.core.config.Property].
2021-07-13 16:44:15,977 RMI TCP Connection(3)-127.0.0.1 DEBUG PluginManager 'TypeConverter' found 26 plugins
2021-07-13 16:44:15,993 RMI TCP Connection(3)-127.0.0.1 DEBUG createProperty(name="log_pattern", value="[%d{HH:mm:ss:SSS}] [%p] - %l - %m%n")
2021-07-13 16:44:15,993 RMI TCP Connection(3)-127.0.0.1 DEBUG Building Plugin[name=property, class=org.apache.logging.log4j.core.config.Property].
2021-07-13 16:44:15,993 RMI TCP Connection(3)-127.0.0.1 DEBUG createProperty(name="file_path", value="./logs")
2021-07-13 16:44:15,994 RMI TCP Connection(3)-127.0.0.1 DEBUG Building Plugin[name=property, class=org.apache.logging.log4j.core.config.Property].
2021-07-13 16:44:15,994 RMI TCP Connection(3)-127.0.0.1 DEBUG createProperty(name="file_max_size", value="30MB")
2021-07-13 16:44:15,995 RMI TCP Connection(3)-127.0.0.1 DEBUG Building Plugin[name=property, class=org.apache.logging.log4j.core.config.Property].
2021-07-13 16:44:15,996 RMI TCP Connection(3)-127.0.0.1 DEBUG createProperty(name="backup_folder", value="${date:yyyy-MM}")
2021-07-13 16:44:15,999 RMI TCP Connection(3)-127.0.0.1 DEBUG Building Plugin[name=property, class=org.apache.logging.log4j.core.config.Property].
2021-07-13 16:44:15,999 RMI TCP Connection(3)-127.0.0.1 DEBUG createProperty(name="backup_file_suffix", value="-%d{yyyy-MM-dd}-%i.log")
2021-07-13 16:44:16,000 RMI TCP Connection(3)-127.0.0.1 DEBUG Building Plugin[name=properties, class=org.apache.logging.log4j.core.config.PropertiesPlugin].
2021-07-13 16:44:16,007 RMI TCP Connection(3)-127.0.0.1 DEBUG configureSubstitutor(={log_pattern=[%d{HH:mm:ss:SSS}] [%p] - %l - %m%n, file_path=./logs, file_max_size=30MB, backup_folder=${date:yyyy-MM}, backup_file_suffix=-%d{yyyy-MM-dd}-%i.log}, Configuration(E:\web\source\zhaocaifeng\coding\newday\oldday\target\oldday\WEB-INF\classes\log4j2.xml))
2021-07-13 16:44:16,007 RMI TCP Connection(3)-127.0.0.1 DEBUG PluginManager 'Lookup' found 13 plugins
2021-07-13 16:44:16,009 RMI TCP Connection(3)-127.0.0.1 DEBUG Building Plugin[name=filter, class=org.apache.logging.log4j.core.filter.ThresholdFilter].
2021-07-13 16:44:16,015 RMI TCP Connection(3)-127.0.0.1 DEBUG createFilter(level="DEBUG", onMatch="ACCEPT", onMismatch="DENY")
2021-07-13 16:44:16,016 RMI TCP Connection(3)-127.0.0.1 DEBUG Building Plugin[name=layout, class=org.apache.logging.log4j.core.layout.PatternLayout].
2021-07-13 16:44:16,022 RMI TCP Connection(3)-127.0.0.1 DEBUG PatternLayout$Builder(pattern="[%d{HH:mm:ss:SSS}] [%p] - %l - %m%n", PatternSelector=null, Configuration(E:\web\source\zhaocaifeng\coding\newday\oldday\target\oldday\WEB-INF\classes\log4j2.xml), Replace=null, charset="null", alwaysWriteExceptions="null", disableAnsi="null", noConsoleNoAnsi="null", header="null", footer="null")
2021-07-13 16:44:16,024 RMI TCP Connection(3)-127.0.0.1 DEBUG PluginManager 'Converter' found 44 plugins
2021-07-13 16:44:16,047 RMI TCP Connection(3)-127.0.0.1 DEBUG Building Plugin[name=appender, class=org.apache.logging.log4j.core.appender.ConsoleAppender].
2021-07-13 16:44:16,058 RMI TCP Connection(3)-127.0.0.1 DEBUG ConsoleAppender$Builder(target="SYSTEM_OUT", follow="null", direct="null", bufferedIo="null", bufferSize="null", immediateFlush="null", ignoreExceptions="null", PatternLayout([%d{HH:mm:ss:SSS}] [%p] - %l - %m%n), name="Console", Configuration(E:\web\source\zhaocaifeng\coding\newday\oldday\target\oldday\WEB-INF\classes\log4j2.xml), ThresholdFilter(DEBUG), ={})
2021-07-13 16:44:16,061 RMI TCP Connection(3)-127.0.0.1 DEBUG Starting OutputStreamManager SYSTEM_OUT.false.false
2021-07-13 16:44:16,061 RMI TCP Connection(3)-127.0.0.1 DEBUG Building Plugin[name=filter, class=org.apache.logging.log4j.core.filter.ThresholdFilter].
2021-07-13 16:44:16,061 RMI TCP Connection(3)-127.0.0.1 DEBUG createFilter(level="DEBUG", onMatch="ACCEPT", onMismatch="DENY")
2021-07-13 16:44:16,062 RMI TCP Connection(3)-127.0.0.1 DEBUG Building Plugin[name=layout, class=org.apache.logging.log4j.core.layout.PatternLayout].
2021-07-13 16:44:16,062 RMI TCP Connection(3)-127.0.0.1 DEBUG PatternLayout$Builder(pattern="[%d{HH:mm:ss:SSS}] [%p] - %l - %m%n", PatternSelector=null, Configuration(E:\web\source\zhaocaifeng\coding\newday\oldday\target\oldday\WEB-INF\classes\log4j2.xml), Replace=null, charset="null", alwaysWriteExceptions="null", disableAnsi="null", noConsoleNoAnsi="null", header="null", footer="null")
2021-07-13 16:44:16,063 RMI TCP Connection(3)-127.0.0.1 DEBUG Building Plugin[name=TimeBasedTriggeringPolicy, class=org.apache.logging.log4j.core.appender.rolling.TimeBasedTriggeringPolicy].
2021-07-13 16:44:16,068 RMI TCP Connection(3)-127.0.0.1 DEBUG TimeBasedTriggeringPolicy$Builder(interval="null", modulate="null", maxRandomDelay="null")
2021-07-13 16:44:16,069 RMI TCP Connection(3)-127.0.0.1 DEBUG Building Plugin[name=SizeBasedTriggeringPolicy, class=org.apache.logging.log4j.core.appender.rolling.SizeBasedTriggeringPolicy].
2021-07-13 16:44:16,069 RMI TCP Connection(3)-127.0.0.1 DEBUG createPolicy(size="30MB")
2021-07-13 16:44:16,071 RMI TCP Connection(3)-127.0.0.1 DEBUG Building Plugin[name=Policies, class=org.apache.logging.log4j.core.appender.rolling.CompositeTriggeringPolicy].
2021-07-13 16:44:16,072 RMI TCP Connection(3)-127.0.0.1 DEBUG createPolicy(={TimeBasedTriggeringPolicy(nextRolloverMillis=0, interval=1, modulate=false), SizeBasedTriggeringPolicy(size=31457280)})
2021-07-13 16:44:16,072 RMI TCP Connection(3)-127.0.0.1 DEBUG Building Plugin[name=DefaultRolloverStrategy, class=org.apache.logging.log4j.core.appender.rolling.DefaultRolloverStrategy].
2021-07-13 16:44:16,077 RMI TCP Connection(3)-127.0.0.1 DEBUG DefaultRolloverStrategy$Builder(max="20", min="null", fileIndex="null", compressionLevel="null", ={}, stopCustomActionsOnError="null", tempCompressedFilePattern="null", Configuration(E:\web\source\zhaocaifeng\coding\newday\oldday\target\oldday\WEB-INF\classes\log4j2.xml))
2021-07-13 16:44:16,078 RMI TCP Connection(3)-127.0.0.1 DEBUG Building Plugin[name=appender, class=org.apache.logging.log4j.core.appender.RollingFileAppender].
2021-07-13 16:44:16,081 RMI TCP Connection(3)-127.0.0.1 DEBUG RollingFileAppender$Builder(fileName="./logs/debug.log", filePattern="./logs/2021-07/debug-%d{yyyy-MM-dd}-%i.log", append="null", locking="null", Policies(CompositeTriggeringPolicy(policies=[TimeBasedTriggeringPolicy(nextRolloverMillis=0, interval=1, modulate=false), SizeBasedTriggeringPolicy(size=31457280)])), DefaultRolloverStrategy(DefaultRolloverStrategy(min=1, max=20, useMax=true)), advertise="null", advertiseUri="null", createOnDemand="null", filePermissions="null", fileOwner="null", fileGroup="null", bufferedIo="null", bufferSize="null", immediateFlush="null", ignoreExceptions="null", PatternLayout([%d{HH:mm:ss:SSS}] [%p] - %l - %m%n), name="RollingFileDebug", Configuration(E:\web\source\zhaocaifeng\coding\newday\oldday\target\oldday\WEB-INF\classes\log4j2.xml), ThresholdFilter(DEBUG), ={})
2021-07-13 16:44:16,091 RMI TCP Connection(3)-127.0.0.1 DEBUG Returning file creation time for D:\software2\tomcat\apache-tomcat-8.5.59-windows-x64\apache-tomcat-8.5.59\bin\.\logs\debug.log
2021-07-13 16:44:16,091 RMI TCP Connection(3)-127.0.0.1 DEBUG Starting RollingFileManager ./logs/debug.log
2021-07-13 16:44:16,094 RMI TCP Connection(3)-127.0.0.1 DEBUG PluginManager 'FileConverter' found 2 plugins
2021-07-13 16:44:16,097 RMI TCP Connection(3)-127.0.0.1 DEBUG Setting prev file time to 2021-07-13T16:22:18.003+0800
2021-07-13 16:44:16,102 RMI TCP Connection(3)-127.0.0.1 DEBUG Initializing triggering policy CompositeTriggeringPolicy(policies=[TimeBasedTriggeringPolicy(nextRolloverMillis=0, interval=1, modulate=false), SizeBasedTriggeringPolicy(size=31457280)])
2021-07-13 16:44:16,103 RMI TCP Connection(3)-127.0.0.1 DEBUG Initializing triggering policy TimeBasedTriggeringPolicy(nextRolloverMillis=0, interval=1, modulate=false)
2021-07-13 16:44:16,104 RMI TCP Connection(3)-127.0.0.1 DEBUG Initializing triggering policy SizeBasedTriggeringPolicy(size=31457280)
2021-07-13 16:44:16,104 RMI TCP Connection(3)-127.0.0.1 DEBUG Building Plugin[name=filter, class=org.apache.logging.log4j.core.filter.ThresholdFilter].
2021-07-13 16:44:16,105 RMI TCP Connection(3)-127.0.0.1 DEBUG createFilter(level="INFO", onMatch="ACCEPT", onMismatch="DENY")
2021-07-13 16:44:16,105 RMI TCP Connection(3)-127.0.0.1 DEBUG Building Plugin[name=layout, class=org.apache.logging.log4j.core.layout.PatternLayout].
2021-07-13 16:44:16,106 RMI TCP Connection(3)-127.0.0.1 DEBUG PatternLayout$Builder(pattern="[%d{HH:mm:ss:SSS}] [%p] - %l - %m%n", PatternSelector=null, Configuration(E:\web\source\zhaocaifeng\coding\newday\oldday\target\oldday\WEB-INF\classes\log4j2.xml), Replace=null, charset="null", alwaysWriteExceptions="null", disableAnsi="null", noConsoleNoAnsi="null", header="null", footer="null")
2021-07-13 16:44:16,107 RMI TCP Connection(3)-127.0.0.1 DEBUG Building Plugin[name=TimeBasedTriggeringPolicy, class=org.apache.logging.log4j.core.appender.rolling.TimeBasedTriggeringPolicy].
2021-07-13 16:44:16,108 RMI TCP Connection(3)-127.0.0.1 DEBUG TimeBasedTriggeringPolicy$Builder(interval="null", modulate="null", maxRandomDelay="null")
2021-07-13 16:44:16,108 RMI TCP Connection(3)-127.0.0.1 DEBUG Building Plugin[name=SizeBasedTriggeringPolicy, class=org.apache.logging.log4j.core.appender.rolling.SizeBasedTriggeringPolicy].
2021-07-13 16:44:16,109 RMI TCP Connection(3)-127.0.0.1 DEBUG createPolicy(size="30MB")
2021-07-13 16:44:16,109 RMI TCP Connection(3)-127.0.0.1 DEBUG Building Plugin[name=Policies, class=org.apache.logging.log4j.core.appender.rolling.CompositeTriggeringPolicy].
2021-07-13 16:44:16,110 RMI TCP Connection(3)-127.0.0.1 DEBUG createPolicy(={TimeBasedTriggeringPolicy(nextRolloverMillis=0, interval=1, modulate=false), SizeBasedTriggeringPolicy(size=31457280)})
2021-07-13 16:44:16,110 RMI TCP Connection(3)-127.0.0.1 DEBUG Building Plugin[name=DefaultRolloverStrategy, class=org.apache.logging.log4j.core.appender.rolling.DefaultRolloverStrategy].
2021-07-13 16:44:16,110 RMI TCP Connection(3)-127.0.0.1 DEBUG DefaultRolloverStrategy$Builder(max="20", min="null", fileIndex="null", compressionLevel="null", ={}, stopCustomActionsOnError="null", tempCompressedFilePattern="null", Configuration(E:\web\source\zhaocaifeng\coding\newday\oldday\target\oldday\WEB-INF\classes\log4j2.xml))
2021-07-13 16:44:16,111 RMI TCP Connection(3)-127.0.0.1 DEBUG Building Plugin[name=appender, class=org.apache.logging.log4j.core.appender.RollingFileAppender].
2021-07-13 16:44:16,111 RMI TCP Connection(3)-127.0.0.1 DEBUG RollingFileAppender$Builder(fileName="./logs/info.log", filePattern="./logs/2021-07/info-%d{yyyy-MM-dd}-%i.log", append="null", locking="null", Policies(CompositeTriggeringPolicy(policies=[TimeBasedTriggeringPolicy(nextRolloverMillis=0, interval=1, modulate=false), SizeBasedTriggeringPolicy(size=31457280)])), DefaultRolloverStrategy(DefaultRolloverStrategy(min=1, max=20, useMax=true)), advertise="null", advertiseUri="null", createOnDemand="null", filePermissions="null", fileOwner="null", fileGroup="null", bufferedIo="null", bufferSize="null", immediateFlush="null", ignoreExceptions="null", PatternLayout([%d{HH:mm:ss:SSS}] [%p] - %l - %m%n), name="RollingFileInfo", Configuration(E:\web\source\zhaocaifeng\coding\newday\oldday\target\oldday\WEB-INF\classes\log4j2.xml), ThresholdFilter(INFO), ={})
2021-07-13 16:44:16,113 RMI TCP Connection(3)-127.0.0.1 DEBUG Returning file creation time for D:\software2\tomcat\apache-tomcat-8.5.59-windows-x64\apache-tomcat-8.5.59\bin\.\logs\info.log
2021-07-13 16:44:16,113 RMI TCP Connection(3)-127.0.0.1 DEBUG Starting RollingFileManager ./logs/info.log
2021-07-13 16:44:16,113 RMI TCP Connection(3)-127.0.0.1 DEBUG PluginManager 'FileConverter' found 2 plugins
2021-07-13 16:44:16,114 RMI TCP Connection(3)-127.0.0.1 DEBUG Setting prev file time to 2021-07-13T16:22:18.026+0800
2021-07-13 16:44:16,114 RMI TCP Connection(3)-127.0.0.1 DEBUG Initializing triggering policy CompositeTriggeringPolicy(policies=[TimeBasedTriggeringPolicy(nextRolloverMillis=0, interval=1, modulate=false), SizeBasedTriggeringPolicy(size=31457280)])
2021-07-13 16:44:16,114 RMI TCP Connection(3)-127.0.0.1 DEBUG Initializing triggering policy TimeBasedTriggeringPolicy(nextRolloverMillis=0, interval=1, modulate=false)
2021-07-13 16:44:16,114 RMI TCP Connection(3)-127.0.0.1 DEBUG Initializing triggering policy SizeBasedTriggeringPolicy(size=31457280)
2021-07-13 16:44:16,114 RMI TCP Connection(3)-127.0.0.1 DEBUG Building Plugin[name=filter, class=org.apache.logging.log4j.core.filter.ThresholdFilter].
2021-07-13 16:44:16,115 RMI TCP Connection(3)-127.0.0.1 DEBUG createFilter(level="WARN", onMatch="ACCEPT", onMismatch="DENY")
2021-07-13 16:44:16,115 RMI TCP Connection(3)-127.0.0.1 DEBUG Building Plugin[name=layout, class=org.apache.logging.log4j.core.layout.PatternLayout].
2021-07-13 16:44:16,117 RMI TCP Connection(3)-127.0.0.1 DEBUG PatternLayout$Builder(pattern="[%d{HH:mm:ss:SSS}] [%p] - %l - %m%n", PatternSelector=null, Configuration(E:\web\source\zhaocaifeng\coding\newday\oldday\target\oldday\WEB-INF\classes\log4j2.xml), Replace=null, charset="null", alwaysWriteExceptions="null", disableAnsi="null", noConsoleNoAnsi="null", header="null", footer="null")
2021-07-13 16:44:16,118 RMI TCP Connection(3)-127.0.0.1 DEBUG Building Plugin[name=TimeBasedTriggeringPolicy, class=org.apache.logging.log4j.core.appender.rolling.TimeBasedTriggeringPolicy].
2021-07-13 16:44:16,118 RMI TCP Connection(3)-127.0.0.1 DEBUG TimeBasedTriggeringPolicy$Builder(interval="null", modulate="null", maxRandomDelay="null")
2021-07-13 16:44:16,118 RMI TCP Connection(3)-127.0.0.1 DEBUG Building Plugin[name=SizeBasedTriggeringPolicy, class=org.apache.logging.log4j.core.appender.rolling.SizeBasedTriggeringPolicy].
2021-07-13 16:44:16,119 RMI TCP Connection(3)-127.0.0.1 DEBUG createPolicy(size="30MB")
2021-07-13 16:44:16,120 RMI TCP Connection(3)-127.0.0.1 DEBUG Building Plugin[name=Policies, class=org.apache.logging.log4j.core.appender.rolling.CompositeTriggeringPolicy].
2021-07-13 16:44:16,120 RMI TCP Connection(3)-127.0.0.1 DEBUG createPolicy(={TimeBasedTriggeringPolicy(nextRolloverMillis=0, interval=1, modulate=false), SizeBasedTriggeringPolicy(size=31457280)})
2021-07-13 16:44:16,120 RMI TCP Connection(3)-127.0.0.1 DEBUG Building Plugin[name=appender, class=org.apache.logging.log4j.core.appender.RollingFileAppender].
2021-07-13 16:44:16,122 RMI TCP Connection(3)-127.0.0.1 DEBUG RollingFileAppender$Builder(fileName="./logs/warn.log", filePattern="./logs/2021-07/warn-%d{yyyy-MM-dd}-%i.log", append="null", locking="null", Policies(CompositeTriggeringPolicy(policies=[TimeBasedTriggeringPolicy(nextRolloverMillis=0, interval=1, modulate=false), SizeBasedTriggeringPolicy(size=31457280)])), Strategy=null, advertise="null", advertiseUri="null", createOnDemand="null", filePermissions="null", fileOwner="null", fileGroup="null", bufferedIo="null", bufferSize="null", immediateFlush="null", ignoreExceptions="null", PatternLayout([%d{HH:mm:ss:SSS}] [%p] - %l - %m%n), name="RollingFileWarn", Configuration(E:\web\source\zhaocaifeng\coding\newday\oldday\target\oldday\WEB-INF\classes\log4j2.xml), ThresholdFilter(WARN), ={})
2021-07-13 16:44:16,124 RMI TCP Connection(3)-127.0.0.1 DEBUG Returning file creation time for D:\software2\tomcat\apache-tomcat-8.5.59-windows-x64\apache-tomcat-8.5.59\bin\.\logs\warn.log
2021-07-13 16:44:16,125 RMI TCP Connection(3)-127.0.0.1 DEBUG Starting RollingFileManager ./logs/warn.log
2021-07-13 16:44:16,125 RMI TCP Connection(3)-127.0.0.1 DEBUG PluginManager 'FileConverter' found 2 plugins
2021-07-13 16:44:16,125 RMI TCP Connection(3)-127.0.0.1 DEBUG Setting prev file time to 2021-07-13T16:22:18.036+0800
2021-07-13 16:44:16,126 RMI TCP Connection(3)-127.0.0.1 DEBUG Initializing triggering policy CompositeTriggeringPolicy(policies=[TimeBasedTriggeringPolicy(nextRolloverMillis=0, interval=1, modulate=false), SizeBasedTriggeringPolicy(size=31457280)])
2021-07-13 16:44:16,126 RMI TCP Connection(3)-127.0.0.1 DEBUG Initializing triggering policy TimeBasedTriggeringPolicy(nextRolloverMillis=0, interval=1, modulate=false)
2021-07-13 16:44:16,126 RMI TCP Connection(3)-127.0.0.1 DEBUG Initializing triggering policy SizeBasedTriggeringPolicy(size=31457280)
2021-07-13 16:44:16,127 RMI TCP Connection(3)-127.0.0.1 DEBUG Building Plugin[name=filter, class=org.apache.logging.log4j.core.filter.ThresholdFilter].
2021-07-13 16:44:16,127 RMI TCP Connection(3)-127.0.0.1 DEBUG createFilter(level="ERROR", onMatch="ACCEPT", onMismatch="DENY")
2021-07-13 16:44:16,127 RMI TCP Connection(3)-127.0.0.1 DEBUG Building Plugin[name=layout, class=org.apache.logging.log4j.core.layout.PatternLayout].
2021-07-13 16:44:16,128 RMI TCP Connection(3)-127.0.0.1 DEBUG PatternLayout$Builder(pattern="[%d{HH:mm:ss:SSS}] [%p] - %l - %m%n", PatternSelector=null, Configuration(E:\web\source\zhaocaifeng\coding\newday\oldday\target\oldday\WEB-INF\classes\log4j2.xml), Replace=null, charset="null", alwaysWriteExceptions="null", disableAnsi="null", noConsoleNoAnsi="null", header="null", footer="null")
2021-07-13 16:44:16,128 RMI TCP Connection(3)-127.0.0.1 DEBUG Building Plugin[name=TimeBasedTriggeringPolicy, class=org.apache.logging.log4j.core.appender.rolling.TimeBasedTriggeringPolicy].
2021-07-13 16:44:16,128 RMI TCP Connection(3)-127.0.0.1 DEBUG TimeBasedTriggeringPolicy$Builder(interval="null", modulate="null", maxRandomDelay="null")
2021-07-13 16:44:16,129 RMI TCP Connection(3)-127.0.0.1 DEBUG Building Plugin[name=SizeBasedTriggeringPolicy, class=org.apache.logging.log4j.core.appender.rolling.SizeBasedTriggeringPolicy].
2021-07-13 16:44:16,129 RMI TCP Connection(3)-127.0.0.1 DEBUG createPolicy(size="30MB")
2021-07-13 16:44:16,129 RMI TCP Connection(3)-127.0.0.1 DEBUG Building Plugin[name=Policies, class=org.apache.logging.log4j.core.appender.rolling.CompositeTriggeringPolicy].
2021-07-13 16:44:16,130 RMI TCP Connection(3)-127.0.0.1 DEBUG createPolicy(={TimeBasedTriggeringPolicy(nextRolloverMillis=0, interval=1, modulate=false), SizeBasedTriggeringPolicy(size=31457280)})
2021-07-13 16:44:16,130 RMI TCP Connection(3)-127.0.0.1 DEBUG Building Plugin[name=appender, class=org.apache.logging.log4j.core.appender.RollingFileAppender].
2021-07-13 16:44:16,131 RMI TCP Connection(3)-127.0.0.1 DEBUG RollingFileAppender$Builder(fileName="./logs/error.log", filePattern="./logs/2021-07/error-%d{yyyy-MM-dd}-%i.log", append="null", locking="null", Policies(CompositeTriggeringPolicy(policies=[TimeBasedTriggeringPolicy(nextRolloverMillis=0, interval=1, modulate=false), SizeBasedTriggeringPolicy(size=31457280)])), Strategy=null, advertise="null", advertiseUri="null", createOnDemand="null", filePermissions="null", fileOwner="null", fileGroup="null", bufferedIo="null", bufferSize="null", immediateFlush="null", ignoreExceptions="null", PatternLayout([%d{HH:mm:ss:SSS}] [%p] - %l - %m%n), name="RollingFileError", Configuration(E:\web\source\zhaocaifeng\coding\newday\oldday\target\oldday\WEB-INF\classes\log4j2.xml), ThresholdFilter(ERROR), ={})
2021-07-13 16:44:16,132 RMI TCP Connection(3)-127.0.0.1 DEBUG Returning file creation time for D:\software2\tomcat\apache-tomcat-8.5.59-windows-x64\apache-tomcat-8.5.59\bin\.\logs\error.log
2021-07-13 16:44:16,132 RMI TCP Connection(3)-127.0.0.1 DEBUG Starting RollingFileManager ./logs/error.log
2021-07-13 16:44:16,133 RMI TCP Connection(3)-127.0.0.1 DEBUG PluginManager 'FileConverter' found 2 plugins
2021-07-13 16:44:16,133 RMI TCP Connection(3)-127.0.0.1 DEBUG Setting prev file time to 2021-07-13T16:22:18.045+0800
2021-07-13 16:44:16,134 RMI TCP Connection(3)-127.0.0.1 DEBUG Initializing triggering policy CompositeTriggeringPolicy(policies=[TimeBasedTriggeringPolicy(nextRolloverMillis=0, interval=1, modulate=false), SizeBasedTriggeringPolicy(size=31457280)])
2021-07-13 16:44:16,134 RMI TCP Connection(3)-127.0.0.1 DEBUG Initializing triggering policy TimeBasedTriggeringPolicy(nextRolloverMillis=0, interval=1, modulate=false)
2021-07-13 16:44:16,134 RMI TCP Connection(3)-127.0.0.1 DEBUG Initializing triggering policy SizeBasedTriggeringPolicy(size=31457280)
2021-07-13 16:44:16,135 RMI TCP Connection(3)-127.0.0.1 DEBUG Building Plugin[name=appenders, class=org.apache.logging.log4j.core.config.AppendersPlugin].
2021-07-13 16:44:16,135 RMI TCP Connection(3)-127.0.0.1 DEBUG createAppenders(={Console, RollingFileDebug, RollingFileInfo, RollingFileWarn, RollingFileError})
2021-07-13 16:44:16,135 RMI TCP Connection(3)-127.0.0.1 DEBUG Building Plugin[name=logger, class=org.apache.logging.log4j.core.config.LoggerConfig].
2021-07-13 16:44:16,137 RMI TCP Connection(3)-127.0.0.1 DEBUG createLogger(additivity="true", level="TRACE", name="org.springframework", includeLocation="null", ={}, ={}, Configuration(E:\web\source\zhaocaifeng\coding\newday\oldday\target\oldday\WEB-INF\classes\log4j2.xml), Filter=null)
2021-07-13 16:44:16,141 RMI TCP Connection(3)-127.0.0.1 DEBUG Building Plugin[name=AppenderRef, class=org.apache.logging.log4j.core.config.AppenderRef].
2021-07-13 16:44:16,141 RMI TCP Connection(3)-127.0.0.1 DEBUG createAppenderRef(ref="Console", level="null", Filter=null)
2021-07-13 16:44:16,142 RMI TCP Connection(3)-127.0.0.1 DEBUG Building Plugin[name=logger, class=org.apache.logging.log4j.core.config.LoggerConfig].
2021-07-13 16:44:16,143 RMI TCP Connection(3)-127.0.0.1 DEBUG createLogger(additivity="true", level="INFO", name="org.mybatis", includeLocation="null", ={Console}, ={}, Configuration(E:\web\source\zhaocaifeng\coding\newday\oldday\target\oldday\WEB-INF\classes\log4j2.xml), Filter=null)
2021-07-13 16:44:16,144 RMI TCP Connection(3)-127.0.0.1 DEBUG Building Plugin[name=appender-ref, class=org.apache.logging.log4j.core.config.AppenderRef].
2021-07-13 16:44:16,144 RMI TCP Connection(3)-127.0.0.1 DEBUG createAppenderRef(ref="Console", level="null", Filter=null)
2021-07-13 16:44:16,144 RMI TCP Connection(3)-127.0.0.1 DEBUG Building Plugin[name=appender-ref, class=org.apache.logging.log4j.core.config.AppenderRef].
2021-07-13 16:44:16,145 RMI TCP Connection(3)-127.0.0.1 DEBUG createAppenderRef(ref="RollingFileDebug", level="null", Filter=null)
2021-07-13 16:44:16,145 RMI TCP Connection(3)-127.0.0.1 DEBUG Building Plugin[name=appender-ref, class=org.apache.logging.log4j.core.config.AppenderRef].
2021-07-13 16:44:16,145 RMI TCP Connection(3)-127.0.0.1 DEBUG createAppenderRef(ref="RollingFileInfo", level="null", Filter=null)
2021-07-13 16:44:16,146 RMI TCP Connection(3)-127.0.0.1 DEBUG Building Plugin[name=appender-ref, class=org.apache.logging.log4j.core.config.AppenderRef].
2021-07-13 16:44:16,146 RMI TCP Connection(3)-127.0.0.1 DEBUG createAppenderRef(ref="RollingFileWarn", level="null", Filter=null)
2021-07-13 16:44:16,146 RMI TCP Connection(3)-127.0.0.1 DEBUG Building Plugin[name=appender-ref, class=org.apache.logging.log4j.core.config.AppenderRef].
2021-07-13 16:44:16,147 RMI TCP Connection(3)-127.0.0.1 DEBUG createAppenderRef(ref="RollingFileError", level="null", Filter=null)
2021-07-13 16:44:16,147 RMI TCP Connection(3)-127.0.0.1 DEBUG Building Plugin[name=root, class=org.apache.logging.log4j.core.config.LoggerConfig$RootLogger].
2021-07-13 16:44:16,148 RMI TCP Connection(3)-127.0.0.1 DEBUG createLogger(additivity="null", level="DEBUG", includeLocation="null", ={Console, RollingFileDebug, RollingFileInfo, RollingFileWarn, RollingFileError}, ={}, Configuration(E:\web\source\zhaocaifeng\coding\newday\oldday\target\oldday\WEB-INF\classes\log4j2.xml), Filter=null)
2021-07-13 16:44:16,149 RMI TCP Connection(3)-127.0.0.1 DEBUG Building Plugin[name=loggers, class=org.apache.logging.log4j.core.config.LoggersPlugin].
2021-07-13 16:44:16,150 RMI TCP Connection(3)-127.0.0.1 DEBUG createLoggers(={org.springframework, org.mybatis, root})
2021-07-13 16:44:16,152 RMI TCP Connection(3)-127.0.0.1 DEBUG Configuration XmlConfiguration[location=E:\web\source\zhaocaifeng\coding\newday\oldday\target\oldday\WEB-INF\classes\log4j2.xml] initialized
2021-07-13 16:44:16,152 RMI TCP Connection(3)-127.0.0.1 DEBUG Starting configuration XmlConfiguration[location=E:\web\source\zhaocaifeng\coding\newday\oldday\target\oldday\WEB-INF\classes\log4j2.xml]
2021-07-13 16:44:16,154 RMI TCP Connection(3)-127.0.0.1 DEBUG Log4j2 ConfigurationScheduler starting 1 threads
2021-07-13 16:44:16,155 RMI TCP Connection(3)-127.0.0.1 DEBUG Started configuration XmlConfiguration[location=E:\web\source\zhaocaifeng\coding\newday\oldday\target\oldday\WEB-INF\classes\log4j2.xml] OK.
2021-07-13 16:44:16,156 RMI TCP Connection(3)-127.0.0.1 DEBUG Shutting down OutputStreamManager SYSTEM_OUT.false.false-1
2021-07-13 16:44:16,156 RMI TCP Connection(3)-127.0.0.1 DEBUG Shut down OutputStreamManager SYSTEM_OUT.false.false-1, all resources released: true
2021-07-13 16:44:16,156 RMI TCP Connection(3)-127.0.0.1 DEBUG Appender DefaultConsole-1 stopped with status true
2021-07-13 16:44:16,156 RMI TCP Connection(3)-127.0.0.1 DEBUG Stopped org.apache.logging.log4j.core.config.DefaultConfiguration@4849a828 OK
2021-07-13 16:44:16,162 RMI TCP Connection(3)-127.0.0.1 DEBUG Registering MBean org.apache.logging.log4j2:type=49a59ff6
2021-07-13 16:44:16,166 RMI TCP Connection(3)-127.0.0.1 DEBUG Registering MBean org.apache.logging.log4j2:type=49a59ff6,component=StatusLogger
2021-07-13 16:44:16,168 RMI TCP Connection(3)-127.0.0.1 DEBUG Registering MBean org.apache.logging.log4j2:type=49a59ff6,component=ContextSelector
2021-07-13 16:44:16,170 RMI TCP Connection(3)-127.0.0.1 DEBUG Registering MBean org.apache.logging.log4j2:type=49a59ff6,component=Loggers,name=
2021-07-13 16:44:16,171 RMI TCP Connection(3)-127.0.0.1 DEBUG Registering MBean org.apache.logging.log4j2:type=49a59ff6,component=Loggers,name=org.springframework
2021-07-13 16:44:16,172 RMI TCP Connection(3)-127.0.0.1 DEBUG Registering MBean org.apache.logging.log4j2:type=49a59ff6,component=Loggers,name=org.mybatis
2021-07-13 16:44:16,174 RMI TCP Connection(3)-127.0.0.1 DEBUG Registering MBean org.apache.logging.log4j2:type=49a59ff6,component=Appenders,name=Console
2021-07-13 16:44:16,175 RMI TCP Connection(3)-127.0.0.1 DEBUG Registering MBean org.apache.logging.log4j2:type=49a59ff6,component=Appenders,name=RollingFileDebug
2021-07-13 16:44:16,175 RMI TCP Connection(3)-127.0.0.1 DEBUG Registering MBean org.apache.logging.log4j2:type=49a59ff6,component=Appenders,name=RollingFileInfo
2021-07-13 16:44:16,175 RMI TCP Connection(3)-127.0.0.1 DEBUG Registering MBean org.apache.logging.log4j2:type=49a59ff6,component=Appenders,name=RollingFileWarn
2021-07-13 16:44:16,175 RMI TCP Connection(3)-127.0.0.1 DEBUG Registering MBean org.apache.logging.log4j2:type=49a59ff6,component=Appenders,name=RollingFileError
2021-07-13 16:44:16,180 RMI TCP Connection(3)-127.0.0.1 DEBUG org.apache.logging.log4j.core.util.SystemClock does not support precise timestamps.
2021-07-13 16:44:16,181 RMI TCP Connection(3)-127.0.0.1 DEBUG Reconfiguration complete for context[name=49a59ff6] at URI E:\web\source\zhaocaifeng\coding\newday\oldday\target\oldday\WEB-INF\classes\log4j2.xml (org.apache.logging.log4j.core.LoggerContext@2abad743) with optional ClassLoader: null
2021-07-13 16:44:16,181 RMI TCP Connection(3)-127.0.0.1 DEBUG Shutdown hook enabled. Registering a new one.
2021-07-13 16:44:16,182 RMI TCP Connection(3)-127.0.0.1 DEBUG LoggerContext[name=49a59ff6, org.apache.logging.log4j.core.LoggerContext@2abad743] started OK.

真正读取log4j配置的代码如下

org.apache.logging.log4j.core.config.ConfigurationFactory
在log4j-core的包中 private Configuration getConfiguration(LoggerContext loggerContext, boolean isTest, String name) {boolean named = Strings.isNotEmpty(name);ClassLoader loader = LoaderUtil.getThreadContextClassLoader();Iterator var6 = getFactories().iterator();while(true) {ConfigurationFactory factory;String prefix;String[] types;do {if (!var6.hasNext()) {return null;}factory = (ConfigurationFactory)var6.next();prefix = isTest ? "log4j2-test" : "log4j2";types = factory.getSupportedTypes();} while(types == null);String[] var11 = types;int var12 = types.length;for(int var13 = 0; var13 < var12; ++var13) {String suffix = var11[var13];if (!suffix.equals("*")) {String configName = named ? prefix + name + suffix : prefix + suffix;ConfigurationSource source = ConfigurationSource.fromResource(configName, loader);if (source != null) {if (!factory.isActive()) {LOGGER.warn("Found configuration file {} for inactive ConfigurationFactory {}", configName, factory.getClass().getName());}return factory.getConfiguration(loggerContext, source);}}}}}

调用堆栈

二、使用slf4j+log4j

pom

<dependency><groupId>org.slf4j</groupId><artifactId>slf4j-log4j12</artifactId><version>1.7.25</version>
</dependency><dependency><groupId>org.apache.logging.log4j</groupId><artifactId>log4j-to-slf4j</artifactId><version>2.13.3</version>
</dependency>

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