7-log4j2之自定义Appender

一、添加Maven依赖

 

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

 

 

二、自定义Appender

 

package com.weidai.zm.logger;
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.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;
import java.io.Serializable;
/**
* @author : zhangyanqing
* @time : 2017/12/10
* @desc : 自定义Appender
*/
@Plugin(name="ConsoleArea", category = "core",elementType = "appender", printObject = true)
public class MyAppender extends AbstractAppender{
public MyAppender(final String name, final Filter filter, final Layout<? extends Serializable> layout, final boolean ignoreExceptions) {
super(name, filter, layout,ignoreExceptions);
}
@Override
public void append(LogEvent logEvent) {
System.out.println("[My Appender] "+logEvent.getLoggerName()+"=>"+logEvent.getMessage());
}
@PluginFactory
public 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);
}
}

 

三、log4j2.xml配置文件

 

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

 

四、测试代码

 

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
/**
* @author : zhangyanqing
* @time : 2017/12/9
* @desc : 根控制器日志测试
*/
public class ConsoleLoggerTest {
public static final Logger LOGGER = LogManager.getLogger(LogManager.ROOT_LOGGER_NAME);
public static void main(String[] args){
LOGGER.trace("trace level");
LOGGER.debug("debug level");
LOGGER.info("info level");
LOGGER.warn("warn level");
LOGGER.error("error level");
LOGGER.fatal("fatal level");
}
}