log4j-2.x 高性能配置（支持jdk6）

log4j2.xml

<?xml version="1.0" encoding="UTF-8"?><Configuration status="WARN">    <!-- Don't forget to set system property-DLog4jContextSelector=org.apache.logging.log4j.core.async.AsyncLoggerContextSelector     to make all loggers asynchronous. -->    <Appenders>        <RollingRandomAccessFile name="RollingRandomAccessFile" fileName="C:/Users/win7/Downloads/log/app.log"                                 filePattern="logs/$${date:yyyy-MM}/app-%d{MM-dd-yyyy}-%i.log.gz">            <PatternLayout>                <Pattern>%d %p %c{1.} [%t] %m%n</Pattern>            </PatternLayout>            <Policies>                <SizeBasedTriggeringPolicy size="5 MB"/>            </Policies>        </RollingRandomAccessFile>    </Appenders>    <Loggers>        <Root level="info">            <AppenderRef ref="RollingRandomAccessFile"/>        </Root>    </Loggers></Configuration>

Java代码

通过添加 

-DLog4jContextSelector=org.apache.logging.log4j.core.async.AsyncLoggerContextSelector

或者设置System系统属性，以使用“disruptor”开启最高性能。

package test;import org.apache.logging.log4j.LogManager;import org.apache.logging.log4j.Logger;public class Main {    private static final Logger LOGGER = LogManager.getLogger(Main.class);    public static void main(String[] args) throws InterruptedException {        Thread[] threads = new Thread[2];        for (int i = 0; i < threads.length; i++) {            threads[i] =                    new Thread(new Runnable() {                        public void run() {                            for (int i = 0; i < 1000; i++) {                                testLog();                            }                        }                    });        }        long s = System.currentTimeMillis();        for (int i = 0; i < threads.length; i++) {            threads[i].start();        }        for (int i = 0; i < threads.length; i++) {            threads[i].join();        }        long e = System.currentTimeMillis();        System.out.println(e - s);    }    public static void testLog() {        LOGGER.debug("debug!!!");        LOGGER.info("info!!!");        LOGGER.warn("warn!!!");        LOGGER.error("error!!!");        LOGGER.fatal("fatal!!!");    }}

依赖包（支持jdk6的jar）

disruptor-3.0.0.beta1.jar

log4j-api-2.3.jar

log4j-core-2.3.jar

兼容log4j 1.2

1.添加依赖包：log4j-1.2-api-2.3.jar

2.声明和log4j 1.2保持一致：

private static final org.apache.log4j.Logger LOGGER = org.apache.log4j.Logger.getLogger(Main.class.getName());

其他的和log4j2都是一样的（注意配置：AsyncLoggerContextSelector）。