在记录中动态添加Appender

Question

我有一个来自SLF4J的Logger实例。该记录器已经将其记录到控制台。我想在其中添加一个附加的应用程序，该应用程序将分别登录每个线程的文件。所以我想使用SiftingAppender

我创建了以下UTILS类，以将Appender添加到Logger实例。

package com.worksap.company.hue.com.bizcore.outputengine.devtools;
import org.slf4j.LoggerFactory;
import ch.qos.logback.classic.Logger;
import ch.qos.logback.classic.LoggerContext;
import ch.qos.logback.classic.encoder.PatternLayoutEncoder;
import ch.qos.logback.classic.sift.MDCBasedDiscriminator;
import ch.qos.logback.classic.sift.SiftingAppender;
import ch.qos.logback.classic.spi.ILoggingEvent;
import ch.qos.logback.core.Appender;
import ch.qos.logback.core.Context;
import ch.qos.logback.core.joran.spi.JoranException;
import ch.qos.logback.core.rolling.RollingFileAppender;
import ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP;
import ch.qos.logback.core.rolling.TimeBasedRollingPolicy;
import ch.qos.logback.core.sift.AppenderFactory;
public class Utils {
    public static Logger putNewAppender(String file, org.slf4j.Logger log) {
        LoggerContext lc = (LoggerContext)LoggerFactory.getILoggerFactory();
        Logger logger = lc.getLogger(log.getName());
        SiftingAppender sa = new SiftingAppender();
        sa.setName("SIFT");
        sa.setContext(lc);
        MDCBasedDiscriminator discriminator = new MDCBasedDiscriminator();
        discriminator.setKey("logFileName");
        discriminator.setDefaultValue("head0");
        discriminator.start();
        sa.setDiscriminator(discriminator);
        sa.setAppenderFactory(new AppenderFactory<ILoggingEvent>() {
            @Override
            public Appender<ILoggingEvent> buildAppender(Context context, String discriminatingValue)
                    throws JoranException {
                RollingFileAppender<ILoggingEvent> appender = new RollingFileAppender<>();
                appender.setName("ROLLINGFILE-" + discriminatingValue);
                appender.setContext(context);
                appender.setFile(discriminatingValue + ".log");
                TimeBasedRollingPolicy<ILoggingEvent> policy = new TimeBasedRollingPolicy<>();
                policy.setContext(context);
                policy.setMaxHistory(5);
                policy.setFileNamePattern(discriminatingValue + "-%d{yyyy-MM-dd-HH-mm}-%i.log.gz");
                policy.setParent(appender);
                policy.start();
                SizeAndTimeBasedFNATP<ILoggingEvent> innerpolicy = new SizeAndTimeBasedFNATP<>();
                innerpolicy.setContext(context);
                innerpolicy.setMaxFileSize("512KB");
                innerpolicy.setTimeBasedRollingPolicy(policy);
                innerpolicy.start();
                policy.setTimeBasedFileNamingAndTriggeringPolicy(innerpolicy);
                policy.start();
                appender.setRollingPolicy(policy);
                PatternLayoutEncoder pl = new PatternLayoutEncoder();
                pl.setContext(context);
                pl.setPattern("%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n");
                pl.start();
                appender.setEncoder(pl);
                appender.start();
                return appender;
            }
        });
        sa.start();
        logger.addAppender(sa);
        logger.setAdditive(false);
        return logger;
    }
}

我试图在这里测试日志：

@Slf4j
public class IfxOutputJobToolTest {
    @Test
    public void outputTest() throws Exception {
        Logger logger2 = Utils.putNewAppender("C:\Users\works\Downloads\somename", log);
        MDC.put("logFileName", "somename");
        logger2.info("something is getting logged");
        logger2.error("somerghing");
        logger2.warn("somrgklsajg");
        logger2.debug("ser");
        MDC.remove("logFileName");
        LoggerContext context = (LoggerContext)LoggerFactory.getILoggerFactory();
        for (ch.qos.logback.classic.Logger logger3 : context.getLoggerList()) {
            for (Iterator<Appender<ILoggingEvent>> index = logger3.iteratorForAppenders(); index.hasNext();) {
                Appender<ILoggingEvent> appender = index.next();
                System.out.println(appender);
            }
        }
    }
}

控制台上的输出如下：

ch.qos.logback.classic.sift.SiftingAppender[SIFT]
ch.qos.logback.core.ConsoleAppender[CONSOLE]
ch.qos.logback.core.ConsoleAppender[CONSOLE]
ch.qos.logback.core.ConsoleAppender[CONSOLE_SPRING]

但是，没有一个记录器信息实际上在控制台或文件中打印出来。如果我不添加siftingAppender，它在控制台上正确打印。如何编程添加SiftingAppender？

我不允许更改logback.xml

启用日志记录后，我将获得以下内容：

16:40:08,943 |-INFO in c.q.l.core.rolling.TimeBasedRollingPolicy - Will use gz compression
16:40:08,946 |-INFO in c.q.l.core.rolling.TimeBasedRollingPolicy - Will use the pattern somename-%d{yyyy-MM-dd-HH-mm}-%i.log for the active file
16:40:08,956 |-INFO in c.q.l.core.rolling.DefaultTimeBasedFileNamingAndTriggeringPolicy - The date pattern is 'yyyy-MM-dd-HH-mm' from file name pattern 'somename-%d{yyyy-MM-dd-HH-mm}-%i.log.gz'.
16:40:08,956 |-INFO in c.q.l.core.rolling.DefaultTimeBasedFileNamingAndTriggeringPolicy - Roll-over every minute.
16:40:08,957 |-INFO in c.q.l.core.rolling.DefaultTimeBasedFileNamingAndTriggeringPolicy - Setting initial period to Tue Jun 06 16:35:47 JST 2017
16:40:08,962 |-INFO in ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP@77a4bac - The date pattern is 'yyyy-MM-dd-HH-mm' from file name pattern 'somename-%d{yyyy-MM-dd-HH-mm}-%i.log.gz'.
16:40:08,962 |-INFO in ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP@77a4bac - Roll-over every minute.
16:40:08,962 |-INFO in ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP@77a4bac - Setting initial period to Tue Jun 06 16:35:47 JST 2017
16:40:08,964 |-INFO in c.q.l.core.rolling.TimeBasedRollingPolicy - Will use gz compression
16:40:08,964 |-INFO in c.q.l.core.rolling.TimeBasedRollingPolicy - Will use the pattern somename-%d{yyyy-MM-dd-HH-mm}-%i.log for the active file
16:40:08,965 |-INFO in ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP@77a4bac - The date pattern is 'yyyy-MM-dd-HH-mm' from file name pattern 'somename-%d{yyyy-MM-dd-HH-mm}-%i.log.gz'.
16:40:08,966 |-INFO in ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP@77a4bac - Roll-over every minute.
16:40:08,966 |-INFO in ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP@77a4bac - Setting initial period to Tue Jun 06 16:35:47 JST 2017
16:40:08,969 |-INFO in ch.qos.logback.core.rolling.RollingFileAppender[ROLLINGFILE-somename] - Active log file name: somename.log
16:40:08,969 |-INFO in ch.qos.logback.core.rolling.RollingFileAppender[ROLLINGFILE-somename] - File property is set to [somename.log]
16:40:08,975 |-INFO in c.q.l.co.rolling.helper.RenameUtil - Renaming file [somename.log] to [somename.log91512733365898.tmp]
16:40:08,979 |-INFO in ch.qos.logback.core.rolling.helper.SizeAndTimeBasedArchiveRemover@96be1ae - first clean up after appender initialization
16:40:08,979 |-INFO in ch.qos.logback.core.rolling.helper.SizeAndTimeBasedArchiveRemover@96be1ae - periodsElapsed = 336
16:40:08,979 |-INFO in ch.qos.logback.core.rolling.helper.Compressor - GZ compressing [somename.log91512733365898.tmp] as [somename-2017-06-06-16-35-0.log.gz]

编辑

删除此行logger.setAdditive(false);后，日志将在控制台上打印。但是，我看不到文件得到创建。

Answer 1

看来，您在Appender Factory中构建Appender的方式似乎存在一些问题。不确定，确切的问题是什么，但是我尝试了以下代码，并且有效。

sa.setAppenderFactory(new AppenderFactory(({

                 public Appender<ILoggingEvent> buildAppender(Context context, String discriminatingValue)
                         throws JoranException {
                     PatternLayoutEncoder ple = new PatternLayoutEncoder();
                    ple.setPattern("%date [%thread] [%file:%line] %msg%n");
                    ple.setContext(context);
                    ple.start();

                    RollingFileAppender<ILoggingEvent> logFileAppender = new RollingFileAppender();
                            logFileAppender.setContext(context);
                            logFileAppender.setName("File-"+discriminatingValue);
                            logFileAppender.setEncoder(ple);
                            logFileAppender.setFile(filename+"-"+discriminatingValue+".txt");
                            SizeAndTimeBasedRollingPolicy<ILoggingEvent> logFilePolicy = new SizeAndTimeBasedRollingPolicy();
                            logFilePolicy.setContext(context);
                            logFilePolicy.setParent(logFileAppender);
                            logFilePolicy.setFileNamePattern(filename+"-"+discriminatingValue+"-%d{yyyy-MM-dd}.%i.txt");
                            logFilePolicy.setMaxHistory(5);
                            logFilePolicy.setMaxFileSize(FileSize.valueOf("512kb"));
                            logFilePolicy.setTotalSizeCap(FileSize.valueOf("1gb"));
                            logFilePolicy.start();
                            logFileAppender.setRollingPolicy(logFilePolicy);
                            logFileAppender.start();
                          logFileAppender.start();
                     return logFileAppender;
                 }
             });

`