Scala date 日期处理

package com.juanpi.bi.sc_utils

import java.text.SimpleDateFormat
import java.util.{Calendar, Date}

import com.juanpi.bi.streaming.DateHour
import org.joda.time.DateTime

/**
* Created by juanpi on 2015/8/18.
*/
object DateUtils {
def dateHour(milliseconds: Long):DateHour = {
val dateTime = new DateTime(milliseconds)
DateHour(dateTime.toString("yyyy-MM-dd"), dateTime.toString("H"))
}

/**
* 返回日期加上gu_id最后一位，作为log文件的保存目录
*
* @param milliseconds
* @param gu_id
* @return
*/
def dateGuidPartitions(milliseconds: Long, gu_id: String): String = {
val dateTime = new DateTime(milliseconds)
val date = dateTime.toString("yyyy-MM-dd")
val gu_hex = (gu_id.last).toLower
s"date=${date}/gu_hash=${gu_hex}"
}

/**
* 返回 yyyy-MM-dd 格式的日期
*
* @param milliseconds
* @return
*/
def dateStr(milliseconds: Long): String = {
val dateTime = new DateTime(milliseconds)
dateTime.toString("yyyy-MM-dd")
}

/**
* 接受一个时间戳的参数，返回日期和小时
*
* @param milliseconds
* @return
*/
def dateHourStr(milliseconds: Long): (String, String) = {
val dateTime = new DateTime(milliseconds)
(dateTime.toString("yyyy-MM-dd"), dateTime.toString("H"))
}

/**
*
* @return 返回当前的日期串
*/
def getDateNow():String={
val now:Date = new Date()
val dateFormat:SimpleDateFormat = new SimpleDateFormat("yyyy-MM-dd")
val dt = dateFormat.format( now )
dt
}

/**
* 指定日期和间隔天数，返回指定日期前N天的日期 date - N days
* @param dt
* @param interval
* @return
*/
def getDaysBefore(dt: Date, interval: Int):String = {
val dateFormat: SimpleDateFormat = new SimpleDateFormat("yyyy-MM-dd")

val cal: Calendar = Calendar.getInstance()
cal.setTime(dt);

cal.add(Calendar.DATE, - interval)
val yesterday = dateFormat.format(cal.getTime())
yesterday
}

/**
* 指定日期和间隔天数，返回指定日期前N天的日期： date + N days
* @param dt
* @param interval
* @return
*/
def getDaysLater(dt: Date, interval: Int):String = {
val dateFormat: SimpleDateFormat = new SimpleDateFormat("yyyy-MM-dd")

val cal: Calendar = Calendar.getInstance()
cal.setTime(dt);

cal.add(Calendar.DATE, + interval)
val yesterday = dateFormat.format(cal.getTime())
yesterday
}

/**
* 2017-01-17  A Week Ago is 2017-01-07
* @return
*/
def getWeekAgoDateStr(): String = {
val dt: Date = new Date()
val dtStr = getDaysBefore(dt, 7)
dtStr
}

/**
*  2017-01-17 A Week Later is  2017-01-21
* @return
*/
def getWeekLaterDateStr(): String = {
val dt: Date = new Date()
val dtStr = getDaysLater(dt, 7)
dtStr
}

def getYesterday(): String = {
// Calendar.DATE
val dt: Date = new Date()
val yesterday = getDaysBefore(dt, 1)
return yesterday
}

def main(args: Array[String]) {
println(getWeekAgoDateStr())
println(getWeekLaterDateStr())

}
}