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;
}

}