计算地球上两点的距离

/** * 计算地球上两个点的距离 * @author xuri002 * */public class DistCnvter {public enum GaussSphere {Beijing54, Xian80, WGS84,}private static double Rad(double d) {return d * Math.PI / 180.0;}public static double getDistance(double lng1, double lat1, double lng2,double lat2, GaussSphere gs) {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* (gs == GaussSphere.WGS84 ? 6378137.0 : (gs == GaussSphere.Xian80 ? 6378140.0 : 6378245.0));s = Math.round(s * 10000) / 10000;return s;}}