根据经纬度计算两点距离（单位：km）

根据经纬度计算两点距离（单位：km）

public class GeographicalSearchUtils {
 
 private static double EARTH_RADIUS = 6378.137;
 private static double rad(double d){
    return d * Math.PI / 180.0;
 }

 
 public static double getDistance(double latA, double lonA, double latB, double lonB){
  double distance=0;
  double radLat=rad(latA)-rad(latB);
  double radLon=rad(lonA)-rad(lonB);
  distance=2 * Math.asin(Math.sqrt(Math.pow(Math.sin(radLat/2),2) +
       Math.cos(rad(latA))*Math.cos(rad(latB))*Math.pow(Math.sin(radLon/2),2)));
  distance=distance*EARTH_RADIUS;
  distance=Math.round(distance*10000);
  distance=distance/10000;
  return distance;
 }
}