<dependencies>
 <dependency>
 <groupId>org.apache.logging.log4j</groupId>
 <artifactId>log4j-api</artifactId>
 <version>2.10.0</version>
 </dependency>
 <dependency>
 <groupId>org.apache.logging.log4j</groupId>
 <artifactId>log4j-core</artifactId>
 <version>2.10.0</version>
 </dependency>
</dependencies>

<?xml version="1.0" encoding="UTF-8"?>
<Configuration status="WARN">
 <Appenders>
 <Console name="Console" target="SYSTEM_OUT">
 <PatternLayout pattern="%d{HH:mm:ss.SSS} [%t] %-5level %logger{36} - %msg%n"/>
 </Console>
 </Appenders>
 <Loggers>
 <Root level="info">
 <AppenderRef ref="Console"/>
 </Root>
 </Loggers>
</Configuration>

private static final Logger logger = LogManager.getLogger(MyApp.class);
 @Test
 public void testLog4j(){
 logger.info("hello world!");
 }
}

<?xml version="1.0" encoding="UTF-8"?>
<Configuration status="error">
 <Appenders>
 <JDBC name="databaseAppender" tableName="dbo.application_log">
  <DataSource jndiName="java:/comp/env/jdbc/LoggingDataSource" />
  <Column name="eventDate" isEventTimestamp="true" />
  <Column name="level" pattern="%level" />
  <Column name="logger" pattern="%logger" />
  <Column name="message" pattern="%message" />
  <Column name="exception" pattern="%ex{full}" />
 </JDBC>
 </Appenders>
 <Loggers>
 <Root level="warn">
  <AppenderRef ref="databaseAppender"/>
 </Root>
 </Loggers>
</Configuration>

import org.apache.logging.log4j.Level;
import org.apache.logging.log4j.Marker;
import org.apache.logging.log4j.ThreadContext;
import org.apache.logging.log4j.core.LogEvent;
import org.apache.logging.log4j.core.Logger;
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.PluginFactory;
import org.apache.logging.log4j.core.filter.AbstractFilter;
import org.apache.logging.log4j.message.Message;
@Plugin(name = "MyFilter", category = "Core", elementType = "filter", printObject = true)
public final class MyFilter extends AbstractFilter {
 private final Level level;
 private MyFilter(Level level, Result onMatch, Result onMismatch) {
  super(onMatch, onMismatch);
  this.level = level;
 }
 public Result filter(Logger logger, Level level, Marker marker, String msg, Object[] params) {
  return filter(level);
 }
 public Result filter(Logger logger, Level level, Marker marker, Object msg, Throwable t) {
  return filter(level);
 }
 public Result filter(Logger logger, Level level, Marker marker, Message msg, Throwable t) {
  return filter(level);
 }
 @Override
 public Result filter(LogEvent event) {
  return filter(event.getLevel());
 }
 private Result filter(Level level) {
  /*
  * 業(yè)務(wù)邏輯
  * */
  
  return level.isMoreSpecificThan(this.level) ? onMatch : onMismatch;
 }
 @Override
 public String toString() {
  return level.toString();
 }
 @PluginFactory
 public static MyFilter createFilter(@PluginAttribute(value = "level", defaultString = "ERROR") Level level,
            @PluginAttribute(value = "onMatch", defaultString = "NEUTRAL") Result onMatch,
            @PluginAttribute(value = "onMismatch", defaultString = "DENY") Result onMismatch) {
  return new MyFilter(level, onMatch, onMismatch);
 }
}

<?xml version="1.0" encoding="UTF-8"?>
<Configuration status="warn" monitorInterval="5" packages="your packages" verbose="false" strict="true">
 <Appenders>
 <Console name="Console" target="SYSTEM_OUT" ignoreExceptions="true">
  <PatternLayout pattern="%d{yyyy-MM-dd HH:mm:ss} %level %logger{10} - %msg"/>
  <MyFilter level="info" onMatch="ACCEPT"/>
 </Console>
 </Appenders>
 <Loggers>
 <Root level="info">
  <AppenderRef ref="Console"/>
 </Root>
 </Loggers>
</Configuration>

ThreadContext.push("hello world!");

<Column name="tip" pattern="%x" />

ThreadContext.put("userId","1");

<Column name="userId" pattern="%X{userId}" />