According to the docs it should be possible to use the SpringProfile arbiter to choose whether a given "node" is included, based on the active Spring Boot profile; so I assumed this should work:

根据文档，应该可以使用SpringProfile仲裁器根据活动的Spring Boot配置文件来选择是否包括给定的“节点”；所以我假设这应该是可行的：

    <Properties>
        <SpringProfile name="dev">
            <Property name="logdir" value="/tmp/log"/>
        </SpringProfile>
        <SpringProfile name="docker">
            <Property name="logdir" value="/var/log"/>
        </SpringProfile>
        <Property name="logfile" value="users.log"/>
    </Properties>

However, this does not appear to configure the property (at all) as expected (although, in a different part of my configuration, this works):

然而，这似乎根本没有按照预期配置该属性(尽管，在我的配置的不同部分中，这是可行的)：

    <Loggers>
        <!-- LOG everything at INFO level, unless the `debug` Spring Profile is used -->
        <SpringProfile name="debug">
            <Root level="debug">
                <AppenderRef ref="Console"/>
                <AppenderRef ref="RollingFile"/>
            </Root>
        </SpringProfile>
        <SpringProfile name="!debug">
            <Root level="info">
                <AppenderRef ref="Console"/>
                <AppenderRef ref="RollingFile"/>
            </Root>
        </SpringProfile>
    </Loggers>

My guess is that either (a) I'm doing it wrong in the Properties or (b) somehow the Properties nodes are not affected by the SpringProfile arbiter.

我的猜测是(A)我在Properties中做错了，或者(B)Properties节点不知何故不受SpringProfile仲裁器的影响。

I am aware that I could just duplicate all the Appender configuration to make it do what I want (or use different files, for that matter); but it seems... well, wasteful - all I want is a different directory for my logs, based on the Spring Profile.

我知道我可以只复制所有的附加器配置，让它做我想做的事情(或者使用不同的文件)；但看起来……嗯，太浪费了--我想要的只是一个不同的目录来存放我的日志，基于Spring配置文件。

Please note that I am aware of all the possible weird and wonderful ways in which this can be otherwise accomplished; here, I'm only interested in whether I can influence the value of Log4j Property via a SpringProfile arbiter - many thanks for any advice you may have!

请注意，我知道所有可能的奇怪和奇妙的方式，否则可以实现这一点；在这里，我只感兴趣的是我是否可以通过SpringProfile仲裁器影响Log4j属性的价值-非常感谢您的任何建议！

You can freely use SpringProfile inside a <Properties> node, but you need to remember that a log4j2.xml configuration file is used twice during the lifecycle of a Spring Boot application:

您可以在 节点内自由使用SpringProfile，但您需要记住，在Spring Boot应用程序的生命周期中，会使用两次log4j2.xml配置文件：

• Log4j Core is initialized almost as soon as your application starts. At this time no Spring Environment is available and ${logdir} expands to ${logdir},


• as soon as the ApplicationEnvironmentPreparedEvent event is triggered, Spring Boot reconfigures Log4j Core again. From this moment ${logdir} will expand properly.

Therefore you also need to set a value for logdir that will be used in the initial phase. Due to issue #1783, the cleanest solution does not work:

因此，您还需要为将在初始阶段使用的logdir设置一个值。由于问题#1783，最干净的解决方案不起作用：

<Select>
    <SpringProfile name="dev">
        <Property name="logdir" value="/tmp/log"/>
    </SpringProfile>
    <SpringProfile name="docker">
        <Property name="logdir" value="/var/log"/>
    </SpringProfile>
    <DefaultArbiter>
        <Property name="logdir" value="..."/>
    </DefaultArbiter>
</Select>

but as a workaround you can use:

但作为一种解决办法，您可以使用：

<Property name="logdir" value="..."/>
<SpringProfile name="dev">
    <Property name="logdir" value="/tmp/log"/>
</SpringProfile>
<SpringProfile name="docker">
    <Property name="logdir" value="/var/log"/>
</SpringProfile>

and ignore the error messages.

并忽略错误消息。

Remark: you can also switch to two configuration files:

备注：您也可以切换到两个配置文件：

• a log4j2.xml for the startup phase of your application (no SpringProfiles allowed),


• a log4j2-spring.xml for the runtime phase of your application.