实例

比如在root logger下新增一个自己的appender ref

public static void load(String appId,String serverAddress,int port){        final LoggerContext ctx = (LoggerContext) LogManager.getContext(false);        final org.apache.logging.log4j.core.config.Configuration config = ctx.getConfiguration();        PatternLayout layout= PatternLayout.createLayout("%d{yyyy-MM-dd HH:mm:ss} [%t] (%F:%L)  - %m%n", null, config,null, Charset.forName("UTF-8"),true,false,null,null);        Appender appender= MyLog4j2Appender.createAppender("MyLog4j2Appender",layout, null, null);        appender.start();        config.addAppender(appender);        config.getLoggerConfig("ROOT").addAppender(appender, Level.ERROR,null);        ctx.updateLoggers(config);    }

其实对应的xml配置就是

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