<?xml version="1.0" encoding="UTF-8"?><!-- 配置LoggerConfig，即Appenders的日志级别为WARN -->
<Configuration status="WARN"><!-- 定义下面的引用名 --><Properties><property name="basePath">${sys:vmparam}</property><property name="filePath">${basePath}/app.log</property></Properties><!-- Appenders支持配置多个Appender，支持向不同的目标输送日志，本例为配置向控制台输出 --><Appenders><Console name="Console" target="SYSTEM_OUT"><PatternLayout pattern="%d{HH:mm:ss.SSS} [%t] %-5level %logger{36} - %msg%n" /></Console><!-- 将日志输出到指定位置的文件中 --><RollingFile name="RollingFile" fileName="${filePath}"filePattern="logs/$${date:yyyy-MM}/app-%d{yyyy-MM-dd-HH}-%i.log.gz"><Policies><!-- interval单位为filePattern最后一个单位，此处为6小时，modulate若为true，则日志时间将以0点为边界进行偏移计算，由于加了.gz策略，所以此处意思为每隔6小时，便会新生成一个log4j2的压缩文件，当每个文件超过250M时，也会新生成一个log4j2的压缩文件 --><TimeBasedTriggeringPolicy interval="6" modulate="true"/><SizeBasedTriggeringPolicy size="250 MB"/></Policies><!-- 滚动策略，日志文件最多保留20个 --><DefaultRolloverStrategy max="20"/><!-- 最多备份30天以内||日志文件大小达到100GB的日志||文件数量超过十个此处为策略限制，Delete中可以按自己需要用正则表达式编写 --><DefaultRolloverStrategy><Delete basePath="${filePath}" maxDepth="1"><IfFileName glob="logs_*.log" /><IfLastModified age="30d" /><IfAccumulatedFileSize exceeds="100 GB" /><IfAccumulatedFileCount exceeds="10" /></Delete></DefaultRolloverStrategy></RollingFile></Appenders><!-- Loggers支持配置多个Logger，可引用不同的目标Appender，也可根据业务需求定制特定要求的Appender --><Loggers><AsyncLogger name="AsyncLogger" level="trace"><appender-ref ref="Console" /><appender-ref ref="RollingFile" /></AsyncLogger><asyncRoot level="trace"><appender-ref ref="Console" /></asyncRoot> <Root level="info"><!-- <AppenderRef ref="Console" /> --><AppenderRef ref="RollingFile" /></Root><!-- 第三方日志系统 --><logger name="org.springframework" level="INFO" additivity="false"><appender-ref ref="Console" /></logger><logger name="io.netty" level="warn"/><logger name="org.apache.http" level="warn"/><logger name="org.mongodb.driver" level="INFO"/><logger name="org.jboss.netty" level="warn"/><logger name="org.springframework.data.redis" level="INFO"/></Loggers>
</Configuration>

Collection<org.apache.logging.log4j.core.Logger> current = LoggerContext.getContext(false).getLoggers();
Collection<org.apache.logging.log4j.core.Logger> notcurrent = LoggerContext.getContext().getLoggers();
Collection<org.apache.logging.log4j.core.Logger> allConfig = current;
allConfig.addAll(notcurrent);
for (org.apache.logging.log4j.core.Logger log:allConfig){log.setLevel(Level.DEBUG);
}　

package com.jyk.log4j2.log4j2_test;import java.io.Serializable;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReadWriteLock;
import java.util.concurrent.locks.ReentrantReadWriteLock;
import org.apache.logging.log4j.core.Filter;
import org.apache.logging.log4j.core.Layout;
import org.apache.logging.log4j.core.LogEvent;
import org.apache.logging.log4j.core.appender.AbstractAppender;
import org.apache.logging.log4j.core.appender.AppenderLoggingException;
import org.apache.logging.log4j.core.config.plugins.Plugin;
import org.apache.logging.log4j.core.config.plugins.PluginAttribute;
import org.apache.logging.log4j.core.config.plugins.PluginElement;
import org.apache.logging.log4j.core.config.plugins.PluginFactory;
import org.apache.logging.log4j.core.layout.PatternLayout;@Plugin(name = "MyAppender", category = "Core", elementType = "appender", printObject = true)
public class MyAppender extends AbstractAppender {/*** @fields serialVersionUID*/private static final long serialVersionUID = -830237775522429777L;private final ReadWriteLock rwLock = new ReentrantReadWriteLock();private final Lock readLock = rwLock.readLock();//需要实现的构造方法，直接使用父类就行protected MyAppender(final String name, final Filter filter, final Layout<? extends Serializable> layout,final boolean ignoreExceptions) {super(name, filter, layout, ignoreExceptions);}@Overridepublic void append(LogEvent event) {readLock.lock();try {final byte[] bytes = getLayout().toByteArray(event);//日志二进制文件，输出到指定位置就行//拿到每次打印的日志，写自己的业务逻辑System.out.println("enter my append...");} catch (Exception ex) {if (!ignoreExceptions()) {throw new AppenderLoggingException(ex);}} finally {readLock.unlock();}}// 下面这个方法可以接收配置文件中的参数信息
    @PluginFactorypublic static MyAppender createAppender(@PluginAttribute("name") String name,@PluginElement("Filter") final Filter filter,@PluginElement("Layout") Layout<? extends Serializable> layout,@PluginAttribute("ignoreExceptions") boolean ignoreExceptions) {if (name == null) {LOGGER.error("No name provided for MyCustomAppenderImpl");return null;}if (layout == null) {layout = PatternLayout.createDefaultLayout();}return new MyAppender(name, filter, layout, ignoreExceptions);}
}

<Configuration status="WARN" packages="com.jyk.log4j2.log4j2_test"><MyAppender name="textarea"><PatternLayout pattern="%d{HH:mm:ss.SSS} [%t] %-5level %logger{36} - %msg%n" />
</MyAppender>