我有一个 dropwizard 应用程序，我在其中将记录器附加程序配置为文件如下:

logging:
  level: INFO

  loggers:
    "mylogger": INFO
    "com.path.to.class": INFO

  appenders:
    - type: file
      currentLogFilename: .logs/mylogs.log
      archivedLogFilenamePattern: .logs/archive.%d.log.gz
      archivedFileCount: 14

并且，在我的应用中创建了记录器:

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;    

private final Logger OpLogger = LoggerFactory.getLogger("mylogger");
(and)
private final Logger ClassLogger = LoggerFactory.getLogger(pathToClass.class);

在 main() 中做一些测试日志记录:

OpLogger.info("test 1");
ClassLogger.info("test 2);

应用程序启动并运行没有问题；但我没有得到任何日志(当然，Jetty 访问日志除外，它们已正确打印到 mylogs.log)，无论是在 stdout 还是在 mylogs.log 文件中。相反，如果我删除 configuration.yml 中的记录器配置，我会将所有日志打印到标准输出。 也许这是 dropwizard 的问题，或者我必须在 configuration.yml 中添加一些东西？ 我正在使用 Dropwizard 0.8.0

最佳答案

更新 最新版本的 dropwizard 支持开箱即用的日志配置

我在尝试使用单独的文件设置 Dropwizard (0.8.4) 时遇到了同样的问题。我遇到了同样的问题。所以我挖得更深一点，找到了一个适合我的解决方案(不是最干净的，但我似乎无法让它以不同的方式工作)。

问题是 LoggingFactory#configure 自动将每个 appender 添加到 root。这不是很理想，因此需要覆盖。我所做的是:

1. 覆盖 LoggingFactory。

这有点乱，因为有一些东西需要遗憾地复制 :( 这是我的实现:

import java.io.PrintStream;
import java.lang.management.ManagementFactory;
import java.util.Map;

import javax.management.InstanceAlreadyExistsException;
import javax.management.MBeanRegistrationException;
import javax.management.MBeanServer;
import javax.management.MalformedObjectNameException;
import javax.management.NotCompliantMBeanException;
import javax.management.ObjectName;

import org.slf4j.LoggerFactory;
import org.slf4j.bridge.SLF4JBridgeHandler;

import com.codahale.metrics.MetricRegistry;
import com.codahale.metrics.logback.InstrumentedAppender;
import com.fasterxml.jackson.annotation.JsonIgnore;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.google.common.collect.ImmutableMap;

import ch.qos.logback.classic.Level;
import ch.qos.logback.classic.Logger;
import ch.qos.logback.classic.LoggerContext;
import ch.qos.logback.classic.PatternLayout;
import ch.qos.logback.classic.jmx.JMXConfigurator;
import ch.qos.logback.classic.jul.LevelChangePropagator;
import ch.qos.logback.classic.spi.ILoggingEvent;
import ch.qos.logback.core.Appender;
import ch.qos.logback.core.util.StatusPrinter;
import io.dropwizard.logging.AppenderFactory;
import io.dropwizard.logging.LoggingFactory;

public class BetterDropWizardLoggingConfig extends LoggingFactory {

    @JsonIgnore
    final LoggerContext loggerContext;

    @JsonIgnore
    final PrintStream configurationErrorsStream;

    @JsonProperty("loggerMapping")
    private ImmutableMap<String, String> loggerMappings;

    private static void hijackJDKLogging() {
        SLF4JBridgeHandler.removeHandlersForRootLogger();
        SLF4JBridgeHandler.install();
    }

    public BetterDropWizardLoggingConfig() {
        PatternLayout.defaultConverterMap.put("h", HostNameConverter.class.getName());
        this.loggerContext = (LoggerContext) LoggerFactory.getILoggerFactory();
        this.configurationErrorsStream = System.err;
    }

    private Logger configureLevels() {
        final Logger root = loggerContext.getLogger(org.slf4j.Logger.ROOT_LOGGER_NAME);
        loggerContext.reset();

        final LevelChangePropagator propagator = new LevelChangePropagator();
        propagator.setContext(loggerContext);
        propagator.setResetJUL(true);

        loggerContext.addListener(propagator);

        root.setLevel(getLevel());

        for (Map.Entry<String, Level> entry : getLoggers().entrySet()) {
            loggerContext.getLogger(entry.getKey()).setLevel(entry.getValue());
        }

        return root;
    }

    @Override
    public void configure(MetricRegistry metricRegistry, String name) {
        hijackJDKLogging();

        final Logger root = configureLevels();

        for (AppenderFactory output : getAppenders()) {
            Appender<ILoggingEvent> build = output.build(loggerContext, name, null);
            if(output instanceof MappedLogger && ((MappedLogger) output).getLoggerName() != null) {
                String appenderName = ((MappedLogger) output).getLoggerName();
                String loggerName = loggerMappings.get(appenderName);
                Logger logger = this.loggerContext.getLogger(loggerName);
                logger.addAppender(build);
            } else {
                root.addAppender(build);
            }
        }

        StatusPrinter.setPrintStream(configurationErrorsStream);
        try {
            StatusPrinter.printIfErrorsOccured(loggerContext);
        } finally {
            StatusPrinter.setPrintStream(System.out);
        }

        final MBeanServer server = ManagementFactory.getPlatformMBeanServer();
        try {
            final ObjectName objectName = new ObjectName("io.dropwizard:type=Logging");
            if (!server.isRegistered(objectName)) {
                server.registerMBean(new JMXConfigurator(loggerContext, server, objectName), objectName);
            }
        } catch (MalformedObjectNameException | InstanceAlreadyExistsException | NotCompliantMBeanException
                | MBeanRegistrationException e) {
            throw new RuntimeException(e);
        }

        configureInstrumentation(root, metricRegistry);
    }

    private void configureInstrumentation(Logger root, MetricRegistry metricRegistry) {
        final InstrumentedAppender appender = new InstrumentedAppender(metricRegistry);
        appender.setContext(loggerContext);
        appender.start();
        root.addAppender(appender);
    }

}

正如您所看到的，遗憾的是我不得不复制/粘贴一些私有(private)成员和方法以使事情按预期工作。

我添加了一个新字段:

@JsonProperty("loggerMapping")
private ImmutableMap<String, String> loggerMappings;

这允许我为每个记录器配置一个映射。这不是开箱即用的，因为我无法获得名称(dropwizard 默认为 appender 名称，非常不方便......)

所以我添加了一个新的记录器，在我的例子中，它还可以进行主机名替换，这是我出于不同原因需要的。为此，我覆盖了旧的 FileAppenderFactory 并实现了我自己的接口(interface) MappedLogger。此处实现:

import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.annotation.JsonTypeName;

import ch.qos.logback.classic.LoggerContext;
import ch.qos.logback.classic.spi.ILoggingEvent;
import ch.qos.logback.core.FileAppender;
import ch.qos.logback.core.rolling.RollingFileAppender;
import io.dropwizard.logging.AppenderFactory;
import io.dropwizard.logging.FileAppenderFactory;

@JsonTypeName("hostnameFile")
public class HostnameFileAppender extends FileAppenderFactory implements AppenderFactory, MappedLogger {

    private static String uuid = UUID.randomUUID().toString();

    @JsonProperty
    private String name;

    public void setCurrentLogFilename(String currentLogFilename) {
        super.setCurrentLogFilename(substitute(currentLogFilename));
    }

    private String substitute(final String pattern) {
        String substitute = null;

        try {
            substitute = InetAddress.getLocalHost().getHostName();
        } catch (UnknownHostException e) {
            System.err.println("Failed to get local hostname:");
            e.printStackTrace(System.err);
            substitute = uuid;
            System.err.println("Using " + substitute + " as fallback.");
        }
        return pattern.replace("${HOSTNAME}", substitute);
    }

    @Override
    public void setArchivedLogFilenamePattern(String archivedLogFilenamePattern) {
        super.setArchivedLogFilenamePattern(substitute(archivedLogFilenamePattern));
    }

    @Override
    public String getLoggerName() {
        return name;
    }
}

请注意，为了添加新的 json 类型，您必须遵循 AppenderFactory 中的 JavaDoc(将 Meta-inf 添加到类路径并使新的 appender 可发现)

到目前为止一切顺利，我们现在有一个可以获取记录器映射的配置，我们有一个可以采用可选名称的记录器。

在配置方法中，我现在将这两者联系在一起:

for (AppenderFactory output : getAppenders()) {
        Appender<ILoggingEvent> build = output.build(loggerContext, name, null);
        if(output instanceof MappedLogger && ((MappedLogger) output).getLoggerName() != null) {
            String appenderName = ((MappedLogger) output).getLoggerName();
            String loggerName = loggerMappings.get(appenderName);
            Logger logger = this.loggerContext.getLogger(loggerName);
            logger.addAppender(build);
        } else {
            root.addAppender(build);
        }
    }

为了向后兼容，我保留了默认行为。如果没有定义名称，appender 将被添加到根记录器。否则，我会解析类型化的记录器并根据需要向其添加附加程序。

最后但同样重要的是旧的 yaml 配置:

logging:
  # The default level of all loggers. Can be OFF, ERROR, WARN, INFO, DEBUG, TRACE, or ALL.
  level: INFO

  loggers:
    "EVENT" : INFO

  loggerMapping:
    # for easier search this is defined as: appenderName -> loggerName rather than the other way around
    "eventLog" : "EVENT"

  appenders:
   - type: console   
     threshold: ALL
     logFormat: "myformat"

   - type: hostnameFile # NOTE THE NEW TYPE WITH HOSTNAME RESOLVE
     currentLogFilename: /Users/artur/tmp/log/my-${HOSTNAME}.log
     threshold: ALL
     archive: true
     archivedLogFilenamePattern: mypattern
     archivedFileCount: 31
     timeZone: UTC
     logFormat: "myFormat"

   - type: hostnameFile
     name: eventLog # NOTE THE APPENDER NAME
     currentLogFilename: something
     threshold: ALL
     archive: true
     archivedLogFilenamePattern: something
     archivedFileCount: 31
     timeZone: UTC
     logFormat: "myFormat"

   - type: hostnameFile
     currentLogFilename: something
     threshold: ERROR
     archive: true
     archivedLogFilenamePattern: something
     archivedFileCount: 31
     timeZone: UTC
     logFormat: "myFormat"

如您所见，我正在将事件附加器映射到事件记录器。这样我所有的事件都在文件 A 中结束，而其他信息在其他地方结束。

希望对您有所帮助。可能不是最干净的解决方案，但我认为 Dropwizard 目前不允许使用此功能。

关于java - Dropwizard 不会将自定义记录器记录到文件中，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/27483442/