用经纬度计算距离

package com.ts.utils;

import com.ts.bean.City;
import com.ts.bean.Location;

public class RoundDistance {

    // 地球赤道半径
    private static final double ERATH_EQUATORIAL_RADIUS = 6378.1370D;
    private static final double CONCVERT_DEGREES_TO_RADIANS = Math.PI / 180;

    /**
     * 计算传入城市与当前城市的实际距离
     *
     * @return
     */
    public static double measureDistance(Location l1, Location l2) {
        double deltaLongitude = deg2rad(l1.getLongitude() - l2.getLongitude());
        double deltaLatitude = deg2rad(l1.getLatitude() - l2.getLatitude());
        double a = Math.pow(Math.sin(deltaLatitude / 2D), 2D)
                + Math.cos(deg2rad(l2.getLatitude()))
                * Math.cos(deg2rad(l1.getLatitude()))
                * Math.pow(Math.sin(deltaLongitude / 2D), 2D);
        return ERATH_EQUATORIAL_RADIUS * 2D * Math.atan2(Math.sqrt(a), Math.sqrt(1D - a));
    }

    // 转化为弧度
    private static double deg2rad(double deg) {
        return deg * CONCVERT_DEGREES_TO_RADIANS;
    }
}

package com.ts.bean;

public abstract class Location {
    // 经度
    double longitude;
    // 纬度
    double latitude;

    public double getLongitude() {
        return longitude;
    }

    public void setLongitude(double longitude) {
        this.longitude = longitude;
    }

    public double getLatitude() {
        return latitude;
    }

    public void setLatitude(double latitude) {
        this.latitude = latitude;
    }
}