java 计算两个坐标之间的距离

public Map check(HotelInfo hotelInfo, HttpServletRequest request){
        Map map = new HashMap();
        //这里写你的查询
        HotelInfo hotelInfolist =  hotelInfoService.selectHotel(hotelInfo);
        String ccc = hotelInfolist.getHotelLat();
        String ddd = hotelInfolist.getHotelLng();
        String eee = request.getParameter("shopLat");
        String fff = request.getParameter("shopLng");

        double c = Double.parseDouble(ccc);
        double d = Double.parseDouble(ddd);
        double e = Double.parseDouble(eee);
        double f = Double.parseDouble(fff);
        double lon1 = (Math.PI / 180) * c;
        double lon2 = (Math.PI / 180) * e;
        double lat1 = (Math.PI / 180) * d;
        double lat2 = (Math.PI / 180) * f;
        // 地球半径
        double R = 6371;

        double distanceAdress = Math.acos(Math.sin(lat1) * Math.sin(lat2) + Math.cos(lat1) * Math.cos(lat2) * Math.cos(lon2 - lon1)) * R;
        String juli = String.valueOf(distanceAdress);
        map.put("distanceAdress",juli);
        return map;//返回到页面  map里面定义的XXX  到页面上直接data.XX
    }