java 实现经纬度计算

<dependency>
    <groupId>org.gavaghan</groupId>
    <artifactId>geodesy</artifactId>
    <version>1.1.3</version>
</dependency>

GlobalCoordinates center = new GlobalCoordinates(38.885791,121.858205);

    /**
     * 根据坐标算距离
     * @param startLng
     * @param startLat
     * @param endLng
     * @param endLat
     * @return
     */
    public static double getDistanceMeter(double startLng,double startLat,double endLng,double endLat){
        GlobalCoordinates startGlobalCoordinates = new GlobalCoordinates(startLat, startLng);
        GlobalCoordinates endGlobalCoordinates = new GlobalCoordinates(endLat, endLng);
        GeodeticCurve geoCurve = new GeodeticCalculator().calculateGeodeticCurve(Ellipsoid.WGS84, startGlobalCoordinates, endGlobalCoordinates);
        return geoCurve.getEllipsoidalDistance();
    }

    /**
     * 根据开始坐标点，角度，计算结束点坐标
     * @param startGlobalCoordinates
     * @param startAngle
     * @param distance
     * @return
     */
    public static GlobalCoordinates getGlobalCoordinates(GlobalCoordinates startGlobalCoordinates, double startAngle, double distance){
        return new GeodeticCalculator().calculateEndingGlobalCoordinates(Ellipsoid.WGS84, startGlobalCoordinates, startAngle, distance);
    }