計算經緯度距離工具類

public class LocationUtils {

private static double EARTH_RADIUS = 6378.137;

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

/**
 * 通過經緯度獲取距離(單位：米)
 * 
 * @param lat1
 * @param lng1
 * @param lat2
 * @param lng2
 * @return 距離
 */
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 * 10000d) / 10000d;
    s = s * 1000;
    return s;
}

public static void main(String[] args) {
    double distance = getDistance(34.2675560000, 108.9534750000,
            34.2464320000, 108.9534750000);
    System.out.println("距離" + distance / 1000 + "公里");
}

}