Java 根据经纬度 角度 距离求另一个点坐标

/**
     * 度换成弧度
     * @param  {Float} d  度
     * @return {[Float}   弧度
     */
    private static double rad(double d) {
    
    
        return d * Math.PI / 180.0;
    }
    /**
     * 弧度换成度
     * @param  {Float} x 弧度
     * @return {Float}   度
     */
    private static double deg(double x) {
    
    
        return x * 180 / Math.PI;
    }
    /**
     *
     * @param {*} lng 经度 113.3960698
     * @param {*} lat 纬度 22.941386
     * @param {*} brng 方位角 45   ---- 正北方：000°或360°  正东方：090° 正南方：180°  正西方：270°
     * @param {*} dist 距离 9000
     *
     */
    private static List<Double> getLngAndLat(double lng, double lat, double brng, double dist) {
    
    
        //大地坐标系资料WGS-84 长半径a=6378137 短半径b=6356752.3142 扁率f=1/298.2572236
        double a = 6378137;
        double b = 6356752.3142;
        double f = 1 / 298.257223563;

        double alpha1 = rad(brng);
        double sinAlpha1 = Math.sin(alpha1);
        double cosAlpha1 = Math.cos(alpha1);

        double tanU1 = (1 - f) * Math.tan(rad(lat));
        double cosU1 = 1 / Math.sqrt((1 + tanU1 * tanU1));
        double sinU1 = tanU1 * cosU1;
        double sigma1 = Math.atan2(tanU1, cosAlpha1);
        double sinAlpha = cosU1 * sinAlpha1;
        double cosSqAlpha = 1 - sinAlpha * sinAlpha;
        double uSq = cosSqAlpha * (a * a - b * b) / (b * b);
        double A = 1 + uSq / 16384 * (4096 + uSq * (-768 + uSq * (320 - 175 * uSq)));
        double B = uSq / 1024 * (256 + uSq * (-128 + uSq * (74 - 47 * uSq)));

        double cos2SigmaM = 0;
        double sinSigma = 0;
        double cosSigma = 0;
        double sigma = dist / (b * A), sigmaP = 2 * Math.PI;
        while (Math.abs(sigma - sigmaP) > 1e-12) {
    
    
            cos2SigmaM = Math.cos(2 * sigma1 + sigma);
            sinSigma = Math.sin(sigma);
            cosSigma = Math.cos(sigma);
            double deltaSigma = B * sinSigma * (cos2SigmaM + B / 4 * (cosSigma * (-1 + 2 * cos2SigmaM * cos2SigmaM)
                    - B / 6 * cos2SigmaM * (-3 + 4 * sinSigma * sinSigma) * (-3 + 4 * cos2SigmaM * cos2SigmaM)));
            sigmaP = sigma;
            sigma = dist / (b * A) + deltaSigma;
        }

        double tmp = sinU1 * sinSigma - cosU1 * cosSigma * cosAlpha1;
        double lat2 = Math.atan2(sinU1 * cosSigma + cosU1 * sinSigma * cosAlpha1,
                (1 - f) * Math.sqrt(sinAlpha * sinAlpha + tmp * tmp));
        double lambda = Math.atan2(sinSigma * sinAlpha1, cosU1 * cosSigma - sinU1 * sinSigma * cosAlpha1);
        double C = f / 16 * cosSqAlpha * (4 + f * (4 - 3 * cosSqAlpha));
        double L = lambda - (1 - C) * f * sinAlpha
                * (sigma + C * sinSigma * (cos2SigmaM + C * cosSigma * (-1 + 2 * cos2SigmaM * cos2SigmaM)));

        double revAz = Math.atan2(sinAlpha, -tmp); // final bearing
        double lng1 = (double)Math.round((lng + deg(L)) * 1000000) / 1000000;
        double lat1 = (double)Math.round(deg(lat2) * 1000000) / 1000000;
        List<Double> list = new ArrayList<>();
        list.add(lng1);
        list.add(lat1);
        return list;
    }