计算两个经纬度坐标之间的距离值

import java.util.*;
import java.math.*;

/**
 * 计算两个经纬度坐标之间的距离值
 * src: https://blog.csdn.net/zhuxiaoping54532/article/details/53671641
 */
public class test1 {
    private final static double EARTH_RADIUS = 6378.137;

    public static void main(String[] args) {
        double lat1, lng1, lat2, lng2;
        Scanner scanner = new Scanner(System.in);
        while (true) {
            System.out.println("Please input lat1, lng1, lat2, lng2: ");
            lat1 = scanner.nextDouble();
            lng1 = scanner.nextDouble();

            lat2 = scanner.nextDouble();
            lng2 = scanner.nextDouble();

            System.out.println("1,2两点的距离为：" + getDistance(lat1, lng1, lat2, lng2));
        }

    }

    // deg2rad
    private static double rad(double d) {
        return d * Math.PI / 180.0;
    }

    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;
    }
}