scala根据经纬度获取两点距离

package utilimport play.api.libs.json.Json/** * Created by wangchunze on 2016/1/20. */object simpleUtil {  def getDistatce(lat1:Double,lon1:Double,lat2:Double,lon2:Double)={    if(lat1!=0 && lon1!=0 && lat2!=0 && lon2!=0){      val R =  6378.137      val radLat1 = lat1* Math.PI / 180      val radLat2 = lat2* Math.PI / 180      val a = radLat1 - radLat2      val b = lon1* Math.PI / 180 - lon2* Math.PI / 180      val s = 2 * Math.sin(Math.sqrt(Math.pow(Math.sin(a/2),2) + Math.cos(radLat1)*Math.cos(radLat2)*Math.pow(Math.sin(b/2),2)))      BigDecimal.decimal(s * R).setScale(2, BigDecimal.RoundingMode.HALF_UP)    }else{      BigDecimal.decimal(0).setScale(2, BigDecimal.RoundingMode.HALF_UP)    }  }  def main(args: Array[String]) {    println(getDistatce(39.969108,117.362791,39.869108,117.562791))  }}