复制代码 代码如下:
/**
 * 计算两点之间距离
 * @param _lat1 - start纬度
 * @param _lon1 - start经度
 * @param _lat2 - end纬度
 * @param _lon2 - end经度
 * @return km(四舍五入)
 */
public static double getdistance(double _lat1,double _lon1, double _lat2,double _lon2){
 double lat1 = (math.pi/180)*_lat1;
 double lat2 = (math.pi/180)*_lat2;
double lon1 = (math.pi/180)*_lon1;
 double lon2 = (math.pi/180)*_lon2;
//地球半径
 double r = 6378.1;
double d =  math.acos(math.sin(lat1)*math.sin(lat2)+math.cos(lat1)*math.cos(lat2)*math.cos(lon2-lon1))*r;
return new bigdecimal(d).setscale(4,bigdecimal.round_half_up).doublevalue();
}public static void main(string[] args) {
 system.out.println(getdistance(45.73990, 126.55893,45.73876, 126.55037));
}