org.apache.logging.log4j.core.layout.PatternLayout#createLayout ( )源码实例Demo

/**
 * Create a Console Appender.
 * @param layout The layout to use (required).
 * @param filter The Filter or null.
 * @param t The target ("SYSTEM_OUT" or "SYSTEM_ERR"). The default is "SYSTEM_OUT".
 * @param follow If true will follow changes to the underlying output stream.
 * @param name The name of the Appender (required).
 * @param ignore If {@code "true"} (default) exceptions encountered when appending events are logged; otherwise
 *               they are propagated to the caller.
 * @return The ConsoleAppender.
 */
@PluginFactory
public static ConsoleAppender createAppender(
        @PluginElement("Layout") Layout<? extends Serializable> layout,
        @PluginElement("Filters") final Filter filter,
        @PluginAttribute("target") final String t,
        @PluginAttribute("name") final String name,
        @PluginAttribute("follow") final String follow,
        @PluginAttribute("ignoreExceptions") final String ignore) {
    if (name == null) {
        LOGGER.error("No name provided for ConsoleAppender");
        return null;
    }
    if (layout == null) {
        layout = PatternLayout.createLayout(null, null, null, null, null);
    }
    final boolean isFollow = Boolean.parseBoolean(follow);
    final boolean ignoreExceptions = Booleans.parseBoolean(ignore, true);
    final Target target = t == null ? Target.SYSTEM_OUT : Target.valueOf(t);
    return new ConsoleAppender(name, layout, filter, getManager(isFollow, target, layout), ignoreExceptions);
}
 

private static Logger configureLog4j() {
    LoggerContext context = (LoggerContext) LogManager.getContext();
    Configuration config = context.getConfiguration();

    PatternLayout layout = PatternLayout.createLayout("%m%n", null, null, Charset.defaultCharset(), false, false, null, null);
    Appender appender = ConsoleAppender.createAppender(layout, null, null, "CONSOLE_APPENDER", null, null);
    appender.start();
    AppenderRef ref = AppenderRef.createAppenderRef("CONSOLE_APPENDER", null, null);
    AppenderRef[] refs = new AppenderRef[]{ref};
    LoggerConfig loggerConfig = LoggerConfig.createLogger("false", Level.INFO, "CONSOLE_LOGGER", "com", refs, null, null, null);
    loggerConfig.addAppender(appender, null, null);

    config.addAppender(appender);
    config.addLogger("Main.class", loggerConfig);
    context.updateLoggers(config);
    return LogManager.getContext().getLogger("Main.class");
}
 

private static Logger configureLog4j() {
    LoggerContext context = (LoggerContext) LogManager.getContext();
    Configuration config = context.getConfiguration();

    PatternLayout layout = PatternLayout.createLayout("%m%n", null, null, Charset.defaultCharset(), false, false, null, null);
    Appender appender = ConsoleAppender.createAppender(layout, null, null, "CONSOLE_APPENDER", null, null);
    appender.start();
    AppenderRef ref = AppenderRef.createAppenderRef("CONSOLE_APPENDER", null, null);
    AppenderRef[] refs = new AppenderRef[]{ref};
    LoggerConfig loggerConfig = LoggerConfig.createLogger("false", Level.INFO, "CONSOLE_LOGGER", "com", refs, null, null, null);
    loggerConfig.addAppender(appender, null, null);

    config.addAppender(appender);
    config.addLogger("Main.class", loggerConfig);
    context.updateLoggers(config);
    return LogManager.getContext().getLogger("Main.class");
}
 

private static MemoryMappedFileAppender createMemoryMappedFileAppender(Configuration config,
		String appenderName, String logFileDir, String taskAttemptID, Object loggerNumber) {
		  StringBuilder logFileName = new StringBuilder(JobUtil.getAndReplaceHolders(logFileDir));
	      
	      if (!(loggerNumber instanceof Integer && (Integer) loggerNumber == 0)) {
	          logFileName.append(loggerNumber).append("-");
	      }
	      logFileName.append(IPRetriever.getCurrentIP()).append(SEPARATOR_UNDERSCORE).append(taskAttemptID).append(LOG_FILE_EXT);
	       // pattern layout
	      PatternLayout pl = PatternLayout.createLayout(LOG_PATTERN, null, config, null,Charset.forName("UTF-8") ,false, false, null, null);
	      return MemoryMappedFileAppender.createAppender(logFileName.toString(), "append", appenderName, "false", "33554432", null, pl, null, null, null, config);
}
 

public static void appendSimplifiedConsoleLogger(Level level) {
    final LoggerContext ctx = (LoggerContext) LogManager.getContext(false);
    final Configuration config = ctx.getConfiguration();
    Layout layout = PatternLayout.createLayout("%msg%n", null, config, null, null, true, false, null, null);
    Appender appender = ConsoleAppender.createAppender(layout, null, ConsoleAppender.Target.SYSTEM_OUT, "stdout", true, true);
    appender.start();

    config.getRootLogger().addAppender(appender, level, null);
    ctx.updateLoggers();
}
 

public static void appendConsoleLogger(Level level) {
    final LoggerContext ctx = (LoggerContext) LogManager.getContext(false);
    final Configuration config = ctx.getConfiguration();
    Layout layout = PatternLayout.createLayout("%highlight{%d{HH:mm} [%-5p] %msg%n}{STYLE=Logback}", null, config, null, null, true, true, null, null);
    Appender appender = ConsoleAppender.createAppender(layout, null, ConsoleAppender.Target.SYSTEM_OUT, "stdout", true, true);
    appender.start();

    config.getRootLogger().addAppender(appender, level, null);
    ctx.updateLoggers();
}
 

public static void appendFileLogger(Level level, String name, Path filePath) {
    final LoggerContext ctx = (LoggerContext) LogManager.getContext(false);
    final Configuration config = ctx.getConfiguration();
    Layout layout = PatternLayout.createLayout("%d{HH:mm} [%-5p] %msg%n", null, config, null, null, true, false, null, null);

    Appender appender = FileAppender.createAppender(filePath.toFile().getAbsolutePath(), "true", "false", name, "true",
            "false", "false", "8192", layout, null, "false", null, config);
    appender.start();

    config.getRootLogger().addAppender(appender, level, null);
    ctx.updateLoggers();
}
 

@Override
protected void doConfigure() {
    super.doConfigure();
    final LoggerContext ctx = (LoggerContext) LogManager.getContext(false);
    Configuration config = ctx.getConfiguration();
    LoggerConfig loggerConfig = config.getLoggerConfig("com");
    final Layout layout = PatternLayout.createLayout("[%-5level] %d{yyyy-MM-dd HH:mm:ss.SSS} [%t] %c{1} - %msg%n", null, config, null, null, false, false, null, null);
    Appender appender = FileAppender.createAppender("target/test.log", "false", "false", "File", "true", "false", "false", "4000", layout, null, "false", null, config);
    loggerConfig.addAppender(appender, Level.DEBUG, null);
    addAppender(appender);
}