空间算法工具类SpaceUtils

package test;/** * 空间算法工具类 * */public class SpaceUtils {    private static double EARTH_RADIUS = 6378.137;    private static double rad(double d) {        return d * Math.PI / 180.0;    }    /**      * 通过两点经纬度获取距离(单位：米)      * @param lat1      * @param lng1      * @param lat2      * @param lng2      * @return      */      public static double getDistance(double lat1, double lng1, double lat2, double lng2) {        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;        s = Math.round(s * 10000d) / 10000d;        s = s * 1000;        return s;    }}