最牛逼 Java 日志框架 — Log4j2，性能无敌，横扫对手.....

logger.debug("Logging in user {} with birthday {}", user.getName(), user.getBirthdayCalendar());

public static Logger logger = LogManager.getFormatterLogger("Foo");
logger.debug("Logging in user %s with birthday %s", user.getName(), user.getBirthdayCalendar());logger.debug("Logging in user %1$s with birthday %2$tm %2$te,%2$tY", user.getName(), user.getBirthdayCalendar());logger.debug("Integer.MAX_VALUE = %,d", Integer.MAX_VALUE);logger.debug("Long.MAX_VALUE = %,d", Long.MAX_VALUE);

logger.printf(Level.INFO, "Logging in user %1$s with birthday %2$tm %2$te,%2$tY", user.getName(), user.getBirthdayCalendar());
logger.debug("Opening connection to {}...", someDataSource);

logger.debug("入参报文：{}",JSON.toJSONString(policyDTO));

if(logger.isDebugEnabled()){    logger.debug("入参报文：{}",JSON.toJSONString(policyDTO));}

void debug(String message, Supplier<?>... paramSuppliers);void info(String message, Supplier<?>... paramSuppliers);void trace(String message, Supplier<?>... paramSuppliers);void error(String message, Supplier<?>... paramSuppliers);

//等同于下面的先判断，后打印logger.debug("入参报文：{}",() -> JSON.toJSONString(policyDTO));

if(logger.isDebugEnabled()){    logger.debug("入参报文：{}",JSON.toJSONString(policyDTO));}

<?xml version="1.0" encoding="UTF-8"?><configuration><appender name = "File" class= "ch.qos.logback.core.rolling.RollingFileAppender">        <file>logs/app.log</file>        <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">            <fileNamePattern>logs/archives/app-%d{yyyy-MM-dd}.log.gz</fileNamePattern><!--一天内大于size就单独分隔-->          <maxFileSize>1 GB</maxFileSize>        </rollingPolicy>    </appender>    <root level="info">      <appender-ref ref="File"/>    </root></configuration>

<?xml version="1.0" encoding="UTF-8"?><Configuration xmlns:xi="http://www.w3.org/2001/XInclude"               status="warn" name="XInclude">    <Appenders>          <RollingFile name="File" fileName="logs/app.log" filePattern="logs/archives/app-%d{yyyy-MM-dd}-%i.log.gz">              <PatternLayout pattern="%d{yyyy-MM-dd HH:mm:ss.SSS} %5p [%t] %-40.40c{1.} : %m%n"/>              <Policies>                  <TimeBasedTriggeringPolicy />                  <!--一天内大于size就单独分隔-->                  <SizeBasedTriggeringPolicy size="1 GB"/>              </Policies>          </RollingFile>    </Appenders>    <Loggers>        <Root level="INFO">            <AppenderRef ref="File"/>        </Root>    </Loggers></Configuration>

<RollingFile name="File">  <!-- 等同于logback中的 --><appender name = "File" class= "ch.qos.logback.core.rolling.RollingFileAppender">

<dependency>    <groupId>org.apache.logging.log4j</groupId>    <artifactId>log4j-core</artifactId>    <version>2.14.1</version></dependency>

<?xml version="1.0" encoding="UTF-8"?><Configuration xmlns:xi="http://www.w3.org/2001/XInclude"               status="warn" name="XInclude">    <Properties>      <Property name="PATTERN" value="%d{yyyy-MM-dd HH:mm:ss.SSS} %5p [%t] %-40.40c{1.} : %m%n"/>    </Properties>    <Appenders>      <!-- 输出到控制台，仅在本地开发环境使用 -->          <Console name="Console" target="SYSTEM_OUT">            <PatternLayout pattern="${PATTERN}"/>          </Console>      <!--输出到日志文件，滚动分割日志文件，自动打包gz-->          <RollingFile name="File" fileName="logs/app.log" filePattern="logs/archives/app-%d{yyyy-MM-dd}-%i.log.gz">              <PatternLayout pattern="${PATTERN}"/>              <Policies>                <!--默认一天一个文件-->                  <TimeBasedTriggeringPolicy />                  <!--一天内大于size就单独分隔-->                  <SizeBasedTriggeringPolicy size="1 GB"/>              </Policies>          </RollingFile>    </Appenders>    <Loggers>      <!-- 添加你的自定义logger，一般用于区分包名的日志，不同包名不同的级别/appender -->      <!-- additivity 意思是，调用完当前appender，是否继续调用parent logger appender，默认true-->      <Logger name="your logger/package name" level="debug" additivity="false"/>      <!--默认的Root Logger 级别-->        <Root level="INFO">          <!--这里需要区分下环境（配合maven profile之类的）-->          <!-- 开发环境使用Console Appender，生产环境使用File Appender -->            <AppenderRef ref="Console"/>          <AppenderRef ref="File"/>        </Root>    </Loggers></Configuration>

<?xml version="1.0" encoding="UTF-8"?>;<Configuration>  <Properties>    <Property name="name1">value</property>    <Property name="name2" value="value2"/>  </Properties>  <filter  ... />  <Appenders>    <appender ... >      <filter  ... />    </appender>    ...  </Appenders>  <Loggers>    <Logger name="name1">      <filter  ... />    </Logger>    ...    <Root level="level">      <AppenderRef ref="name"/>    </Root>  </Loggers></Configuration>

import org.apache.logging.log4j.LogManager;import org.apache.logging.log4j.Logger;Logger logger = LogManager.getLogger(Log4j2Test.class);logger.error(...);logger.warn(...);logger.info(...);logger.debug(...);logger.trace(...);

-Dlog4j2.contextSelector=org.apache.logging.log4j.core.async.AsyncLoggerContextSelector