Log4j 2之初体验

一、maven配置：

在porm.xml中加入:

 

    < dependency >
        < groupId >org.apache.logging.log4j groupId >
        < artifactId >log4j-api artifactId >
        < version >2.3 version >
      dependency >
      < dependency >
        < groupId >org.apache.logging.log4j groupId >
        < artifactId >log4j-core artifactId >
        < version >2.3 version >
      dependency >
    < dependency >
      < groupId >com.lmax groupId >
      < artifactId >disruptor artifactId >
      < version >3.3.2 version >
    dependency >

如果不使用异步写入日志，第三个依赖可以不加入。

二、log4j 2.0的配置文件不再支持properties文件，改用xml。具体如下：

xml  version = "1.0"  encoding = "UTF-8" ?>

< configuration  status = "off"  monitorInterval = "60" >
    < properties >

        < property  name = "LOG_HOME" >logs property >

        < property  name = "BACKUP_HOME" >logs/backup property >
    properties >
    < appenders >

        < Console  name = "console"  target = "SYSTEM_OUT"  follow = "true" >
            < PatternLayout  pattern = "%d{yyyy-MM-dd 'at' HH:mm:ss.SSS z} %-5level %class{36} %L %M - %msg%xEx%n" />
        Console >

        < RollingFile  name = "file"  fileName = "${LOG_HOME}/gvserver.log"
                     filePattern = "${BACKUP_HOME}/$${date:yyyy-MM}/app-%d{MM-dd-yyyy}-%i.log.gz" >
            < PatternLayout  pattern = "%d{yyyy-MM-dd 'at' HH:mm:ss.SSS z} - %msg%xEx%n" />
            < SizeBasedTriggeringPolicy  size = "5KB" />
        RollingFile >

        < Async  name = "async" >
            < AppenderRef  ref = "file" />
        Async >
    appenders >
    < loggers >

        < root  level = "DEBUG" >
            < appender-ref  ref = "async" />
            < appender-ref  ref = "console" />
        root >
    loggers >
configuration >

三、示例程序：

package  com.gvsoft.log;
/**
 * Created with IntelliJ IDEA.
 * ProjectName:gvMsgRouting
 * Date: 15/8/14
 * Time: 下午6:03
 * Desc:
 */
import  org.apache.logging.log4j.LogManager;
import  org.apache.logging.log4j.Logger;
public  class  TestLog {
    static  Logger logger = LogManager.getLogger(TestLog. class .getName());
    public  void  test() {
        logger.error( "this is error log！" );
        logger.info( "this is info log！" );
        logger.debug( "this is debuf log！" );
        logger.warn( "this is warn log！" );
        logger.fatal( "this is fatal log！" );
    }
    public  static  void  main(String arg[]){
        TestLog testLog =  new  TestLog();
        testLog.test();
    }
}