springboot通过javaconfig实现logback配置

版本

2.2.x

创建logback javaconfig

• myapp.BasicConfigurator

public class BasicConfigurator
 extends ch.qos.logback.core.spi.ContextAwareBase
  implements ch.qos.logback.classic.spi.Configurator {
     

    public BasicConfigurator() {
     
    }

    public void configure(LoggerContext lc) {
     
        addInfo("Setting up default configuration.");
        
        ConsoleAppender<ILoggingEvent> ca = new ConsoleAppender<ILoggingEvent>();
        ca.setContext(lc);
        ca.setName("console");
        LayoutWrappingEncoder<ILoggingEvent> encoder = new LayoutWrappingEncoder<ILoggingEvent>();
        encoder.setContext(lc);
        
 
        // same as 
        // PatternLayout layout = new PatternLayout();
        // layout.setPattern("%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n");
        TTLLLayout layout = new TTLLLayout();
 
        layout.setContext(lc);
        layout.start();
        encoder.setLayout(layout);
        
        ca.setEncoder(encoder);
        ca.start();
        
        Logger rootLogger = lc.getLogger(Logger.ROOT_LOGGER_NAME);
        rootLogger.addAppender(ca);
    }
}

创建LoggingSystem

继承springboot默认的LogbackLoggingSystem，并修改默认日志配置实现方法

• myapp.LoggingSystem

public class LoggingSystem extends LogbackLoggingSystem {
     


    public LoggingSystem(ClassLoader classLoader) {
     
        super(classLoader);
    }


    @Override
    protected void loadDefaults(LoggingInitializationContext initializationContext, LogFile logFile) {
     
        LoggerContext context = getLoggerContext();
        stopAndReset(context);
        // 调用自定义的logback javaconfig
        new myapp.BasicConfigurator().configure(context);
        context.setPackagingDataEnabled(true);
    }

    private LoggerContext getLoggerContext() {
     
        ILoggerFactory factory = StaticLoggerBinder.getSingleton().getLoggerFactory();
        Assert.isInstanceOf(LoggerContext.class, factory,
                String.format(
                        "LoggerFactory is not a Logback LoggerContext but Logback is on "
                                + "the classpath. Either remove Logback or the competing "
                                + "implementation (%s loaded from %s). If you are using "
                                + "WebLogic you will need to add 'org.slf4j' to "
                                + "prefer-application-packages in WEB-INF/weblogic.xml",
                        factory.getClass(), getLocation(factory)));
        return (LoggerContext) factory;
    }

    private Object getLocation(ILoggerFactory factory) {
     
        try {
     
            ProtectionDomain protectionDomain = factory.getClass().getProtectionDomain();
            CodeSource codeSource = protectionDomain.getCodeSource();
            if (codeSource != null) {
     
                return codeSource.getLocation();
            }
        } catch (SecurityException ex) {
     
            // Unable to determine location
        }
        return "unknown location";
    }

    private void stopAndReset(LoggerContext loggerContext) {
     
        loggerContext.stop();
        loggerContext.reset();
        if (isBridgeHandlerInstalled()) {
     
            addLevelChangePropagator(loggerContext);
        }
    }

    private boolean isBridgeHandlerInstalled() {
     
        if (!isBridgeHandlerAvailable()) {
     
            return false;
        }
        java.util.logging.Logger rootLogger = LogManager.getLogManager().getLogger("");
        Handler[] handlers = rootLogger.getHandlers();
        return handlers.length == 1 && handlers[0] instanceof SLF4JBridgeHandler;
    }

    private void addLevelChangePropagator(LoggerContext loggerContext) {
     
        LevelChangePropagator levelChangePropagator = new LevelChangePropagator();
        levelChangePropagator.setResetJUL(true);
        levelChangePropagator.setContext(loggerContext);
        loggerContext.addListener(levelChangePropagator);
    }
}

指定日志系统实现类

@SpringBootApplication
public class MyApplication {
    public static void main(String[] args) {
        System.setProperty(org.springframework.boot.logging.LoggingSystem.SYSTEM_PROPERTY, myapp.LoggingSystem.class.getName());
        SpringApplication.run(ManagementApiApplication.class, args);
    }
}