在日志文件中动态填充的变量

Question

我有一个Web服务（詹金斯）处理用户的请求，我希望能够动态地追加请求会话ID，每个日志行，而无需实际变量添加到每个日志动作。

我使用log4j2与SLF4J实现，我使用初始化与org.apache.logging.log4j.core.config.Configurator外部配置文件中的记录，我用每创建每个会话记录器的实例

final Logger logger = LoggerFactory.getLogger(MyClass.class);

我有一个例子：

logger.debug("received new request");
...
logger.debug("added something");

我想加入到每行的用户会话ID，而无需将其添加自己喜欢：

logger.debug("{} received new request",session.getId());
...
logger.debug("{} added something",session.getId());

我log4j2.xml文件是：

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE xml>
<Configuration status="INFO">
    <Properties>
        <Property name="logPath">...</Property>
        <Property name="rollingFileName">...</Property>
    </Properties>
    <Appenders>
        <Console name="console" target="SYSTEM_OUT">
            <PatternLayout pattern="[%highlight{%-5level}] %d{DEFAULT} %c{1}.%M() - %msg%n%throwable{short.lineNumber}" />
        </Console>
        <RollingFile name="rollingFile" fileName="${logPath}/${rollingFileName}.log" filePattern="${logPath}/${rollingFileName}_%d{yyyy-MM-dd}.log">
            <PatternLayout pattern="[%highlight{%-5level}] %d{DEFAULT} %c{1}.%M() - %msg%n%throwable{short.lineNumber}" />
            <Policies>
                <!-- Causes a rollover if the log file is older than the current JVM's start time -->
                <OnStartupTriggeringPolicy />
                <!-- Causes a rollover once the date/time pattern no longer applies to the active file -->
                <TimeBasedTriggeringPolicy interval="1" modulate="true" />
            </Policies>
        </RollingFile>
    </Appenders>
    <Loggers>
        <Logger name="com.project" level="debug" additivity="false">
            <AppenderRef ref="console"/>
            <AppenderRef ref="rollingFile"/>
       </Logger>
    </Loggers>
</Configuration>

从当前日志文件实际结果：

[[36mDEBUG[m] 2019-02-05 16:42:09,794 SpellCheck.getResult() - start
[[36mDEBUG[m] 2019-02-05 16:42:10,420 SpellCheck.getResult() - Spelling correction returned no results.
[[36mDEBUG[m] 2019-02-05 16:42:10,420 SpellCheck.getResult() - end

我想达到的目标：

[[36mDEBUG[m] 2019-02-05 16:42:09,794 SpellCheck.getResult() - 1234 - start
[[36mDEBUG[m] 2019-02-05 16:42:10,420 SpellCheck.getResult() - 1234 - Spelling correction returned no results.
[[36mDEBUG[m] 2019-02-05 16:42:10,420 SpellCheck.getResult() - 1234 - end

其中1234是例如会话ID。

谢谢。

Answer 1

我想通了，比我想象的要容易得多。

基本上添加％X {usersessionid在}到

<PatternLayout pattern= ... /> 

排在log4j2.xml。并在代码中添加

HttpSession session = request.getSession();
org.apache.logging.log4j.ThreadContext.put("userSessionId", session.getId());