升级log4j2.x异步日志

摘要

Log4j 2 包含了基于LMAX 分离库的下一代的异步日志系统，在多线程环境下，异步日志系统比 Log4j 1.x 和Logback提高了10倍性能提升（吞吐量和延迟率 ）

正文

升级jar包

1.升级log4j2.x的jar包

log4j-api-2.5.jar
log4j-core-2.5.jar

2.加入log4j异步日志使用的jar包

disruptor-3.3.4.jar

3.加入log4j1.x的适配jar包

log4j-1.2-api-2.5.jar

log4j2.x获取logger的方式已经改变，如果想要兼容以前的方式，需要这个jar包的辅助，建议引用第三方的jar包最好自己封装一层，要不以后jar包升级，会带来无尽的烦恼。

改动前:import org.slf4j.Logger;
      import org.slf4j.LoggerFactory;

     private static final Logger logger = LoggerFactory.getLogger(XX.class);


改动后:iimport org.apache.logging.log4j.LogManager;
      import org.apache.logging.log4j.Logger;

     private static final Logger logger = LogManager.getLogger(XX.class);

4.pom配置

           <log4j-api.version>2.5</log4j-api.version>

           <dependency>
              <groupId>org.apache.logging.log4j</groupId>
              <artifactId>log4j-1.2-api</artifactId>
              <version>${log4j-api.version}</version>
            </dependency>
           <dependency>
                <groupId>org.apache.logging.log4j</groupId>
                <artifactId>log4j-api</artifactId>
                <version>${log4j-api.version}</version>
            </dependency>
            <dependency>
                <groupId>org.apache.logging.log4j</groupId>
                <artifactId>log4j-core</artifactId>
                <version>${log4j-api.version}</version>
            </dependency>

          <dependency>
              <groupId>com.lmax</groupId>
              <artifactId>disruptor</artifactId>
              <version>3.3.4</version>
            </dependency>

升级配置文件

Log4j.xml升级为log4j2.xml

<?xml version="1.0" encoding="UTF-8"?>
<!-- status用于设置log4j2自身内部的信息输出，可以不设置，当设置成trace时，你会看到log4j2内部各种详细输出。 -->
<configuration status="OFF">
    <appenders>
        <!--这个输出控制台的配置-->
        <Console name="CONSOLE" target="SYSTEM_OUT">
            <PatternLayout pattern="%d [%7r] %6p - %30.30c - %m \n" />
            <!-- 设置级别 -->
            <ThresholdFilter level="info" onMatch="ACCEPT" onMismatch="DENY"/>
        </Console>
        <RollingFile name="FILE-ALL" fileName="${file_path}/${file_name}.log" filePattern="${file_path}/${date:yyyy-MM}/app-%d{MM-dd-yyyy}-%i.log.gz">    
            <PatternLayout pattern="%d [%7r] %6p - %30.30c - %m \n"/>    
            <SizeBasedTriggeringPolicy size="1024 MB" />    
        </RollingFile>
    </appenders>
    <loggers>
        <AsyncLogger name="com.xxx" level="debug" additivity="false">  
            <appender-ref ref="FILE-SQL" />
        </AsyncLogger>
        <AsyncLogger name="org.mybatis" level="debug" additivity="false">  
            <appender-ref ref="FILE-SQL" />
        </AsyncLogger>
        <AsyncLogger name="org.apache.ibatis" level="debug" additivity="false">  
            <appender-ref ref="FILE-SQL" />
        </AsyncLogger>
        <AsyncLogger name="java.sql" level="debug" additivity="false">  
            <appender-ref ref="FILE-SQL" />
        </AsyncLogger>
        <AsyncRoot level="info">
            <appender-ref ref="CONSOLE" />
            <appender-ref ref="FILE-ALL" />
        </AsyncRoot>
     </loggers>
</configuration>

如果要加上位置信息比如哪个类，第几行，需要在AsyncLogger 加入

includeLocation="true"