求解两点（经纬度坐标）的距离

package edu.cloud.editmap.utils;

import org.junit.Test;
/**
 * 经纬度求距离
 * @author lingfeng
 */
public class LatLon2Distance {

    //地球半径
    private static double EARTH_RADIUS = 6378.137;
    /**
     * 经纬度转换
     * @param d
     * @return
     */
    private static double rad(double d)
    {
       return d * Math.PI / 180.0;
    }
    /**
     * 距离计算
     * @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 * 10000) / 10000;
       return s;
    }
    
    @Test
    public void test(){
        //System.out.println(getDistance(25.2803229,110.3083241,25.289289679357516,110.30976545104478));
    }
}