java中根据两个位置的经纬度计算距离

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1、代码

 /**   * 根据两个位置的经纬度，来计算两地的距离（单位为KM）   * 参数为double类型   *  long1 位置1经度   *  lat1  位置1纬度   *  long2 位置2经度   *  lat2  位置2纬度   */ public class Distance {    private static final double EARTH_RADIUS = 6378.137;    private static double rad(double d){        return d * Math.PI / 180.0;    }    public static double GetDistance(double long1, double lat1, double long2, double lat2) {        double a, b, d, sa2, sb2;        lat1 = rad(lat1);        lat2 = rad(lat2);        a = lat1 - lat2;        b = rad(long1 - long2);        sa2 = Math.sin(a / 2.0);        sb2 = Math.sin(b / 2.0);        d = 2   * EARTH_RADIUS                * Math.asin(Math.sqrt(sa2 * sa2 + Math.cos(lat1)                * Math.cos(lat2) * sb2 * sb2));        return d;    }    public static void main(String[] args) {        //根据两点间的经纬度计算距离，单位：km        System.out.println(GetDistance(116.5542, 39.81621, 116.5539, 39.81616));        System.out.println(GetDistance(117.1181, 36.68484, 117.01, 36.66123));        System.out.println(GetDistance(112.9084, 28.14203, 112.9083, 28.14194));        System.out.println(GetDistance(121.5373, 38.86827, 121.5372, 38.86832));        System.out.println(GetDistance(20.5, 118.2, 21.1, 117.6));        System.out.println(GetDistance(121.445140,31.177779, 121.444832,31.179313));    }

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