代码

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import lombok.ToString;
import org.apache.commons.lang3.StringUtils;
import org.apache.commons.math3.util.FastMath;import java.util.*;public class DistanceCalculator {public static void main(String[] args) {List<Activity> activities = Arrays.asList(new Activity("目标地址", 22.543903,113.911223) );// 当前用户地址double userLat = 22.5859635925293; double userLng = 113.86769104003906; List<Activity> sortedActivities = sortActivitiesByDistance(activities, userLat, userLng);Map<String,String> seatMap = new HashMap<String,String>();for (Activity activity : sortedActivities) {double km = DistanceCalculator.calculateDistance(userLat, userLng, activity.getLat(), activity.getLng());double m = km * 1000;String s = convertToFriendlyUnit(m);seatMap.put(activity.getName(),s);
//            System.out.println("Activity: " + activity.getName() + ", Distance: " + DistanceCalculator.calculateDistance(userLat, userLng, activity.getLat(), activity.getLng()) + " km");}System.out.println(seatMap);}public static String getDistance(String userPoi,String targetPoi){if(StringUtils.isBlank(userPoi)){return "附近";}else if(StringUtils.isNotBlank(targetPoi)){String[] split = targetPoi.split(",");if(split.length == 2){double lat = Double.parseDouble(split[0]);double lng = Double.parseDouble(split[1]);String[] userLaction = userPoi.split(",");if(userLaction.length == 2){double userLat = Double.parseDouble(userLaction[0]);double userLng = Double.parseDouble(userLaction[1]);return (DistanceCalculator.convertToFriendlyUnit(DistanceCalculator.calculateDistance(userLat,userLng,lat,lng) * 1000));}else{return "附近";}}else{return "附近";}}else{return "附近";}}public static String convertToFriendlyUnit(double meters) {if (meters >= 1000) {return String.format("%.1fkm", meters / 1000);} else {return String.format("%.1fm", meters);}}public static List<Activity> sortActivitiesByDistance(List<Activity> activities, double userLat, double userLng) {Comparator<Activity> distanceComparator = new Comparator<Activity>() {@Overridepublic int compare(Activity activity1, Activity activity2) {double distance1 = DistanceCalculator.calculateDistance(userLat, userLng, activity1.getLat(), activity1.getLng());double distance2 = DistanceCalculator.calculateDistance(userLat, userLng, activity2.getLat(), activity2.getLng());return Double.compare(distance1, distance2);}};Collections.sort(activities, distanceComparator);return activities;}private static final double R = 6371;public static double calculateDistance(double userLat, double userLng, double eventLat, double eventLng) {double dLat = toRadians(eventLat - userLat);  double dLng = toRadians(eventLng - userLng);  double a = Math.sin(dLat / 2) * Math.sin(dLat / 2) + Math.cos(toRadians(userLat)) * Math.cos(toRadians(eventLat)) * Math.sin(dLng / 2) * Math.sin(dLng / 2);  double c = 2 * FastMath.atan2(Math.sqrt(a), Math.sqrt(1 - a));return R * c; // R is the radius of the Earth (approximate value is 6371 km)  }  private static double toRadians(double degrees) {  return degrees * FastMath.PI / 180;  }public static Double getDistanceMi(String userPoi, String targetPoi) {if(StringUtils.isBlank(userPoi)){return 9999d;}else if(StringUtils.isNotBlank(targetPoi)){String[] split = targetPoi.split(",");if(split.length == 2){double lat = Double.parseDouble(split[0]);double lng = Double.parseDouble(split[1]);String[] userLaction = userPoi.split(",");if(userLaction.length == 2){double userLat = Double.parseDouble(userLaction[0]);double userLng = Double.parseDouble(userLaction[1]);return DistanceCalculator.calculateDistance(userLat,userLng,lat,lng);}else{return 9999d;}}else{return 9999d;}}else{return 9999d;}}@Data@AllArgsConstructor@NoArgsConstructor@ToStringstatic class Activity {private String name;private double lat; // 活动地点的纬度private double lng; // 活动地点的经度// 构造函数、getter和setter方法...}
}