计算两个经纬度之间的距离，计算经纬度距离,// 计算距离常量pri

计算两个经纬度之间的距离，计算经纬度距离,// 计算距离常量pri

// 计算距离常量private static final double EARTH_RADIUS = 6378137;/*** 根据两点间经纬度坐标（double值），计算两点间距离，单位为米* * @param x1* @param y1* @param x2* @param y2* @return*/public static double getDistance(double x1, double y1, double x2, double y2) {double radLat1 = rad(y1);double radLat2 = rad(y2);double a = radLat1 - radLat2;double b = rad(x1) - rad(x2);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;}private static double rad(double d) {return d * Math.PI / 180.0;}