在 log4j xml 配置中使用系统环境变量

2022-01-15 00:00:00 xml environment-variables configuration java log4j

是否可以在 log4j xml 配置文件中引用系统环境变量(相对于 Java 系统属性)?

Is it possible to reference system environment variables (as opposed to Java system properties) in a log4j xml configuration file?

我希望能够做类似的事情:

I'd like to be able to do something like:

<level value="${env.LOG_LEVEL}" />

并让它从系统环境变量中获取，这样我就可以避免使用 -D 参数传递这么多东西.

and have it get that from the system environment variables, so I can avoid having to pass in so many things with -D parameters.

推荐答案

此语法仅记录在 log4j 2.X 中，因此请确保您使用的是正确的版本.它不适用于 1.X 版本.

This syntax is documented only in log4j 2.X so make sure you are using the correct version. It does not work on the 1.X versions.

    <Appenders>
    <File name="file" fileName="${env:LOG_PATH}">
        <PatternLayout>
            <Pattern>%d %p %c{1.} [%t] %m %ex%n</Pattern>
        </PatternLayout>
    </File>
</Appenders>

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