log4j2 常见配置并支持logId

1、常见配置及解释

<?xml version="1.0" encoding="UTF-8"?><!--日志级别以及优先级排序: OFF > FATAL > ERROR > WARN > INFO > DEBUG > TRACE > ALL --><!--Configuration后面的status，这个用于设置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--><!--monitorInterval：Log4j能够自动检测修改配置 文件和重新配置本身，设置间隔秒数--><configuration status="INFO" monitorInterval="30">    <!--先定义所有的appender-->    <appenders>        <!--这个输出控制台的配置-->        <console name="Console" target="SYSTEM_OUT">            <!--输出日志的格式-->            <PatternLayout pattern="[ %p ] [%-d{yyyy-MM-dd HH:mm:ss}] [ LOGID:%X{logid} ] [%l] %m%n"/>        </console>        <!--文件会打印出所有信息，这个log每次运行程序会自动清空，由append属性决定，这个也挺有用的，适合临时测试用-->        <File name="Test" fileName="log/test.log" append="false">            <PatternLayout pattern="[ %p ] %-d{yyyy-MM-dd HH:mm:ss} [ %t:%r ] [%l] %m%n"/>        </File>        <RollingFile name="RollingFileInfo" fileName="log/log.log" filePattern="log/log.log.%d{yyyy-MM-dd}">            <!-- 只接受level=INFO以上的日志 -->            <ThresholdFilter level="info" onMatch="ACCEPT" onMismatch="DENY"/>            <PatternLayout pattern="[ %p ] [%-d{yyyy-MM-dd HH:mm:ss}] [ LOGID:%X{logid} ] [%l] %m%n"/>            <Policies>                <TimeBasedTriggeringPolicy modulate="true" interval="1"/>                <SizeBasedTriggeringPolicy/>            </Policies>        </RollingFile>        <RollingFile name="RollingFileError" fileName="log/error.log" filePattern="log/error.log.%d{yyyy-MM-dd}">            <!-- 只接受level=WARN以上的日志 -->            <Filters>            <ThresholdFilter level="warn" onMatch="ACCEPT" onMismatch="DENY" />            </Filters>            <PatternLayout pattern="[ %p ] %-d{yyyy-MM-dd HH:mm:ss} [ %t:%r ] [%l] %m%n"/>            <Policies>                <TimeBasedTriggeringPolicy modulate="true" interval="1"/>                <SizeBasedTriggeringPolicy/>            </Policies>        </RollingFile>    </appenders>    <!--然后定义logger，只有定义了logger并引入的appender，appender才会生效-->    <loggers>        <!--过滤掉spring和mybatis的一些无用的DEBUG信息-->        <logger name="org.springframework" level="INFO"></logger>        <logger name="org.mybatis" level="INFO"></logger>        <root level="all">            <appender-ref ref="Console"/>            <appender-ref ref="Test"/>            <appender-ref ref="RollingFileInfo"/>            <appender-ref ref="RollingFileError"/>        </root>    </loggers></configuration>

2、Java端配置

运行时指定上述log4j2.xml的配置：

-Dlog4j.configurationFile=./conf/log4j2.xml

3、输出logId或者与log交互

import org.apache.logging.log4j.LogManager;import org.apache.logging.log4j.Logger;import org.apache.logging.log4j.ThreadContext;/** * Created by think on 2017/1/22 0022. */public class LogTest {    private static final Logger logger = LogManager.getLogger(LogTest.class);    static class test extends Thread {        @Override        public void run() {            long time = System.currentTimeMillis();            ThreadContext.put("logid", String.valueOf( time));            logger.info("test thread.");            ThreadContext.clearAll();        }    }    public static void main(String[] args) {        long time = System.currentTimeMillis() ;        ThreadContext.put("logid", String.valueOf(time));        try {            logger.trace("trace...");            logger.debug("debug...");            logger.info("info...");            logger.warn("warn...");            logger.error("error...");            logger.fatal("fatal...");            test test1 = new test();            test test2 = new test();            test1.start();            test2.start();        } catch (Exception e) {            e.printStackTrace();        }        ThreadContext.clearAll();    }}

输出：

[ TRACE ] [2017-02-04 17:10:27] [ LOGID:199427158 ] [logtest.LogTest.main(LogTest.java:37)] trace...[ DEBUG ] [2017-02-04 17:10:27] [ LOGID:199427158 ] [logtest.LogTest.main(LogTest.java:38)] debug...[ INFO ] [2017-02-04 17:10:27] [ LOGID:199427158 ] [logtest.LogTest.main(LogTest.java:39)] info...[ WARN ] [2017-02-04 17:10:27] [ LOGID:199427158 ] [logtest.LogTest.main(LogTest.java:40)] warn...[ ERROR ] [2017-02-04 17:10:27] [ LOGID:199427158 ] [logtest.LogTest.main(LogTest.java:41)] error...[ FATAL ] [2017-02-04 17:10:27] [ LOGID:199427158 ] [logtest.LogTest.main(LogTest.java:42)] fatal...[ INFO ] [2017-02-04 17:11:38] [ LOGID:199498552 ] [logtest.LogTest$test.run(LogTest.java:20)] test thread.[ INFO ] [2017-02-04 17:11:38] [ LOGID:199498551 ] [logtest.LogTest$test.run(LogTest.java:20)] test thread.

本文代码可参考：https://github.com/hawkingfoo/log-test