package com.***********.util;
import java.awt.geom.Point2D;
/**
* 百度工具类
*
* @author qyx
*
*/
public class BaiduUtil2 {
public static void main(String[] args) {
try {
// 太原
Point2D pointDD = new Point2D.Double(112.53, 37.87);
// 上海
Point2D pointXD = new Point2D.Double(121.48, 31.22);
System.out.println("太原－上海："+getDistance(pointDD, pointXD));
} catch (Exception e) {
e.printStackTrace();
}
}
private static final double EARTH_RADIUS = 6371393; // 地球平均半径,单位：m
/**
* 通过AB点经纬度获取距离
*
* @param pointA A点(经，纬)
* @param pointB B点(经，纬)
* @return 距离(单位：米)
*/
public static double getDistance(Point2D pointA, Point2D pointB) {
// 经纬度(角度)转弧度。弧度用作参数，以调用Math.cos和Math.sin
double radiansAX = Math.toRadians(pointA.getX()); // A经弧度
double radiansAY = Math.toRadians(pointA.getY()); // A纬弧度
double radiansBX = Math.toRadians(pointB.getX()); // B经弧度
double radiansBY = Math.toRadians(pointB.getY()); // B纬弧度
// cosβ1cosβ2cos(α1-α2)+sinβ1sinβ2
double cos = Math.cos(radiansAY) * Math.cos(radiansBY) * Math.cos(radiansAX - radiansBX)
+ Math.sin(radiansAY) * Math.sin(radiansBY);
double acos = Math.acos(cos); // 反余弦值
return EARTH_RADIUS * acos; // 最终结果
}
}
