原文地址：http://284772894.iteye.com/blog/1810222

package a;

public class Distance {
 private static final double EARTH_RADIUS = 6378137.0;
 public static void main(String[] args) {
  double lo1 = 108.90, la1 = 34.1;// 第一個經緯度
  double lo2 = 115.4648060, la2 = 38.8738910;// 第二個經緯度
  System.out.println("經緯度結果:" + getDistance(lo1, la1, lo2, la2));
  System.out.println("經緯度結果:" + getDistance(0, 0, 0, 0));
 }
 // 返回單位是米
 public static double getDistance(double longitude1, double latitude1,
   double longitude2, double latitude2) {
  double Lat1 = rad(latitude1);
  double Lat2 = rad(latitude2);
  double a = Lat1 - Lat2;
  double b = rad(longitude1) - rad(longitude2);
  double s = 2 * Math.asin(Math.sqrt(Math.pow(Math.sin(a / 2), 2)
    + Math.cos(Lat1) * Math.cos(Lat2)
    * Math.pow(Math.sin(b / 2), 2)));
  s = s * EARTH_RADIUS;
  s = Math.round(s * 10000) / 10000;
  return s;
 }
 private static double rad(double d) {
  return d * Math.PI / 180.0;
 }
}