log4j简单main程序控制日志级别

例子，kafka打印太多日志了，我直接不让它打印了

    static {
        LoggerContext loggerContext = (LoggerContext) LoggerFactory.getILoggerFactory();
        ch.qos.logback.classic.Logger root = loggerContext.getLogger("org.apache.kafka");
        root.setLevel(Level.toLevel("OFF"));
    }