如何更改所有Log4J 1.x记录器的级别？

Question

I want to be able to programmatically set the logging level for all loggers. This works:

    Logger log = Logger.getLogger(Example.class);
    LogManager.getLogger(Example.class).setLevel(Level.FATAL);
    log.debug("Should not see!");
    LogManager.getLogger(Example.class).setLevel(Level.DEBUG);
    log.debug("Should see!");

However this does not:

    Logger log = Logger.getLogger(Example.class);
    LogManager.getRootLogger().setLevel(Level.FATAL);
    log.debug("Should not see!");
    LogManager.getRootLogger().setLevel(Level.DEBUG);
    log.debug("Should see!");

Answer 1

Get the logger names from LogManager.getCurrentLoggers() and then set the LogManager.getLogger("<name from loop>").setLevel(Level.FATAL) ; using loop.

When you are getting LogManager.getRootLogger() gets the root level logger. It is not going to affect all the individual configuration.