根据经纬度计算米数

public class MapUtils {
    //private static double EARTH_RADIUS = 6378.137;
    private static double EARTH_RADIUS = 6371.393;
    private static double rad(double d)
    {
       return d * Math.PI / 180.0;
    }

    /**
     * 计算两个经纬度之间的距离
     * @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 * 1000);
       return s;
    }



    public static void main(String[] args) {
        System.out.println(MapUtils.GetDistance(29.490295,106.486654,29.615467,106.581515));
    }
}

2、顺带提一下百度地图提供的计算两地经纬度的方法，很简单的一句话调用，可以自行去看百度地图API试试，计算结果单位：米

var map = new BMap.Map("allmap");
var pointA = new BMap.Point(106.486654,29.490295);  // 点坐标A
var pointB = new BMap.Point(106.581515,29.615467);  // 点坐标B
alert(map.getDistance(pointA,pointB)).toFixed(2));  //toFixed(2)意思为保留小数点后两位

文章出处：https://blog.csdn.net/vison155142/article/details/52468180