装配日志

安装日志
日志使用：
下载slf4j.jar
        // Install Java Utils Logging Bridge
        SLF4JBridgeHandler.install();

        // Removes Java Utils Loggers
        LogManager logManager = LogManager.getLogManager();
        java.util.logging.Logger root = logManager.getLogger("");
        Handler[] handlers = root.getHandlers();
        for (int i = 0; i < handlers.length; i++) {
            Handler handler = handlers[i];
            if (handler instanceof ConsoleHandler) {
                root.removeHandler(handler);
            }
        }


  // Java Utils的日志会经过此级别和SLF4J日志级别的双重过滤
        root.setLevel(java.util.logging.Level.INFO);
        LoggerContext context = (LoggerContext) LoggerFactory.getILoggerFactory();

        // 限制com.test信息为INFO级别
        Logger logger = context.getLogger("com.test");
        logger.setLevel(Level.WARN);