两点距离计算

public class DistanceUtil {
 private static final double EARTH_RADIUS = 6378.137;

 private static double rad(double d) {
  return d * Math.PI / 180.0;
 }
 
  /*返回值单位米*/
 public static double GetDistance(double lat1, double lng1, double lat2, double lng2) {
  double value1 = -0.00001d;
  double value2 = 0.00001d;
  
  if(lat1 > value1 && lat1 < value2) {
   return 0;
  }
  if(lng1 > value1 && lng1 < value2) {
   return 0;
  }
  if(lat2 > value1 && lat2 < value2) {
   return 0;
  }
  if(lng2 > value1 && lng2 < value2) {
   return 0;
  }
  
  double radLat1 = rad(lat1);
  double radLat2 = rad(lat2);
  double a = radLat1 - radLat2;
  double b = rad(lng1) - rad(lng2);
  double s = 2 * Math.asin(Math.sqrt(Math.pow(Math.sin(a / 2), 2) + Math.cos(radLat1) * Math.cos(radLat2) * Math.pow(Math.sin(b / 2), 2)));
  s = s * EARTH_RADIUS;
  return s;
 }
}