时间转特征的代码如下，仅供参考：
/**
* 时间转成特征
* @param clickTime 广告点击时间DDHHMM 011235
* @return 特征列表
*/
def clickTime2features(clickTime:String): ArrayBuffer[String] = {
var features = ArrayBuffer[String]()
features += "day_" + clickTime.substring(0, 2)
features += "hour_" + clickTime.substring(2, 4)
features
}