动态更改 log4j 日志级别 [英] Dynamically Changing log4j log level

问题描述

动态更改 log4j 日志级别的不同方法有哪些，这样我就不必重新部署应用程序了.在这些情况下，更改会是永久性的吗?

What are the different approaches for changing the log4j log level dynamically, so that I will not have to redeploy the application. Will the changes be permanent in those cases?

推荐答案

更改日志级别很简单；修改配置的其他部分将提供更深入的方法.

Changing the log level is simple; modifying other portions of the configuration will pose a more in depth approach.

LogManager.getRootLogger().setLevel(Level.DEBUG);

更改在 Logger 的整个生命周期中都是永久性的.重新初始化时，配置将被读取并使用，因为在运行时设置级别不会保持级别更改.

The changes are permanent through the life cyle of the Logger. On reinitialization the configuration will be read and used as setting the level at runtime does not persist the level change.

更新:如果您使用的是 Log4j 2，您应该根据 文档 因为这可以通过实现类来实现.

UPDATE: If you are using Log4j 2 you should remove the calls to setLevel per the documentation as this can be achieved via implementation classes.

不支持调用 logger.setLevel() 或类似方法应用程序接口.应用程序应该删除这些.等效功能是在 Log4j 2 implementation classes 中提供，但可能会离开应用程序易受 Log4j 2 内部变化的影响.

Calls to logger.setLevel() or similar methods are not supported in the API. Applications should remove these. Equivalent functionality is provided in the Log4j 2 implementation classes but may leave the application susceptible to changes in Log4j 2 internals.

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