JAVA相邻经纬度计算距离

  /**   
     * Created by yuliang on 2015/3/20.   
     */    
    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.