Question

我使用以下脚本从yyyy-MM-dd HH：mm：ss日期格式中提取HH：mm：ss

import java.sql.Time

case class Transactions(creationTime: Time)

val formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss")

def parseTransac(line: String): (Transactions) = {
   val fields = line.split(',')
   val creationTime = new Time(formatter.parse(fields(0)).getTime())
   val transactions = Transactions(creationTime)
   (transactions)
}

因此，例如2009-01-15 15:45:23将返回15:45:23。

如何以秒（56723）代替HH：mm：ss

获得结果

Answer 1

根据Jesper的建议，这是解决方案：

import java.sql.Time    

case class Transactions(creationSeconds: Int )

val formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss")

def parseTransac(line: String): (Transactions) = {
   val fields = line.split(',')
   val fullDateTime = new Time(formatter.parse(fields(0)).getTime())
   val creationTime = fullDateTime.toString.split(':')
   val creationSeconds = creationTime(0).toInt*3600 + creationTime(1).toInt*60 + creationTime(2).toInt
   val transactions = Transactions(creationSeconds)
   (transactions)
}

这是另一种基于Dipankar提示的解决方案：

import java.sql.Time
import org.joda.time.DateTime

case class Transactions(creationTime: Int)

val formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss")

def parseTransac(line: String): (Transactions) = {
   val fields = line.split(',')
   val fullDatTime = new DateTime(formatter.parse(fields(0)).getTime())
   val fromMidnight = fullDatTime.withTimeAtStartOfDay()
   val duration = new Duration(fromMidnight, fullDatTime)
   val creationTime = duration.toStandardSeconds().getSeconds()
   val transactions = Transactions(creationTime)
   (transactions)
}

Answer 2

您也可以使用简单的正则表达式执行此操作。

case class Transactions(creationTime: Int)

val format = "\\d{4}-\\d{2}-\\d{2}\\s(\\d{1,2}):(\\d{1,2}):(\\d{1,2})".r

def parseTransac(line: String): (Transactions) = {
  val fields = line.split(',')

  val format(h, m, s) = fields(0)

  Transactions(s.toInt + m.toInt * 60 + h.toInt * 3600)
}

Answer 3

快速单线：

scala> "15:45:23".split(":").map(_.toInt).reduceLeft((x,y) => x*60 +y)
res0: Int = 56723

转换HH：mm：ss，以秒为单位

3 个答案: