配置LogBack/ConsoleAppender写入STDERR

Question

我想用ConsoleAppender配置Logback以使用stderr，而不是stdout。特别是，我希望使用纯代码来实现这一点，而不是使用属性/xml文件。这是我的尝试。有关此代码的关键注意事项:当调用.reset()时(如下面的代码所示)，什么都不登出。当没有调用.reset()时，所有日志都被发送到STDOUT (从而表明下面的代码根本不工作)。

启用该功能的关键部分是什么？

import ch.qos.logback.classic.Level;
import ch.qos.logback.classic.Logger;
import ch.qos.logback.classic.LoggerContext;
import ch.qos.logback.classic.encoder.PatternLayoutEncoder;
import ch.qos.logback.classic.spi.ILoggingEvent;
import ch.qos.logback.core.ConsoleAppender;
import org.slf4j.LoggerFactory;

// stuff

  private static Logger buildLogger() {


        LoggerContext lc = (LoggerContext) LoggerFactory.getILoggerFactory();
        Logger logger = (ch.qos.logback.classic.Logger) LoggerFactory.getLogger(henson.class);
        lc.reset();

        PatternLayoutEncoder ple = new PatternLayoutEncoder();

        ple.setPattern("%date %level [%thread] %logger{10} [%file:%line] %msg%n");
        ple.setContext(lc);
        ple.start();

        ConsoleAppender<ILoggingEvent> ca = new ConsoleAppender<>();
        ca.setTarget("System.err");
        ca.setContext(lc);
        ca.start();
        logger.detachAndStopAllAppenders();
        logger.addAppender(ca);
        logger.setLevel(Level.DEBUG);

        return logger;
    }

Answer 1

诀窍是将编码器添加到控制台，并确保记录器来自上下文。

private static Logger buildLogger() {

        LoggerContext lc = (LoggerContext) LoggerFactory.getILoggerFactory();
        lc.reset();
        Logger logger = lc.getLogger(henson.class);
        logger.detachAndStopAllAppenders();

        PatternLayoutEncoder ple = new PatternLayoutEncoder();
        ple.setPattern("%date %level [%thread] %logger{10} [%file:%line] %msg%n");
        ple.setContext(lc);
        ple.start();

        ConsoleAppender<ILoggingEvent> ca = new ConsoleAppender<>();
        ca.setTarget("System.err");
        ca.setContext(lc);
        ca.setEncoder(ple);
        ca.start();

        logger.addAppender(ca);

        logger.setLevel(Level.DEBUG);
        return logger;
    }