Java通过经纬度计算两地之间的距离 转

    public class LocationUtils {  
        private static double EARTH_RADIUS = 6378.137;  
      
        private static double rad(double d) {  
            return d * Math.PI / 180.0;  
        }  
      
        /** 
         * 通过经纬度获取距离(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;  
        }  
    }