Log4j2：如何为每个用户将日志写入单独的文件？

Question

这是我面临的挑战：

我有一个 servlet 程序。我需要将每个用户的日志写入以该用户命名的文件夹。 像这样的：

    // stores message to David folder
    // /root_path/David/logfile.log
    logger.error(MarkerManager.getMarker("David"), "Error happened");

    // stores message to Mark folder
    // /root_path/Mark/logfile.log                 
    logger.error(MarkerManager.getMarker("Mark"), "Something is broken");

在我的示例中，我使用了标记。但我真的不知道标记是否适合这项任务。

一般来说，我的 appender 应该表现得像 RollingRandomAccessFile appender。 我猜 appender 的配置必须是这样的：

     <RollingRandomAccessFile name="rollingFile"
                 fileName="logs/{markerName ?????}/movie-db.log"
                 filePattern="logs/log-%d{yyyy-MM-dd}-%i.log.zip"
                 append="false"
                 immediateFlush="false"
                 ignoreExceptions="true">
        <PatternLayout pattern="%d{ISO8601} %level{length=5} [%thread] %logger - %msg%n"/>
        <Policies>
            <SizeBasedTriggeringPolicy size="25 MB"/>
            <TimeBasedTriggeringPolicy />
        </Policies>
        <DefaultRolloverStrategy max="10"/>
    </RollingRandomAccessFile>

有什么想法吗？

Answer 1

感谢@Remko Popma 的回答，我明白了。以下是解决方案示例：

package com.bondarenko.tmp;

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.apache.logging.log4j.ThreadContext;

public class TestRouting {

private final static Logger log = LogManager.getLogger(TestRouting.class);

public static void main(String[] args) {
    ThreadContext.put("logFileName", "David");
    log.info("Error happened");

    ThreadContext.put("logFileName", "Mark");
    log.info("Something is broken");

    ThreadContext.remove("logFileName");
}
}

还有log4j.xml：

<?xml version="1.0" encoding="UTF-8"?>
<Configuration status="warn">

<Appenders>
    <Console name="consoleAppender" target="SYSTEM_OUT">
        <!--SHORT PATTERN-->
        <PatternLayout pattern="%d{ABSOLUTE} %level{length=5} [%thread] %logger{1} - %msg%n"/>
        <!--ROBUST PATTERN
        <PatternLayout pattern="%d{ISO8601} %level{length=5} [%thread] %logger - %msg%n"/>-->
    </Console>

    <Routing name="RoutingAppender">
        <Routes pattern="${ctx:logFileName}">
            <Route>
                <RollingFile name="Rolling-${ctx:logFileName}"
                             fileName="logs/${ctx:logFileName}"
                             filePattern="logs/${ctx:logFileName}.%i.log.gz">
                    <PatternLayout pattern="%d{ABSOLUTE} %level{length=5} [%thread] %logger{1} - %msg%n"/>
                    <SizeBasedTriggeringPolicy size="512" />
                </RollingFile>
            </Route>

            <!-- By having this set to ${ctx:logFileName} it will match when filename
                 is not set in the context -->
            <Route ref="consoleAppender" key="${ctx:logFileName}"/>
        </Routes>
    </Routing>

</Appenders>

<Loggers>
    <Logger name="com.bondarenko.tmp" level="info" additivity="false">
        <AppenderRef ref="RoutingAppender"/>
    </Logger>
</Loggers>

Answer 2

Log4j2 FAQ page 有一个使用 RoutingAppender 实现此目的的示例。