添加了关于路径规划的后端文件

src/main/java/com/peteralbus/controller/HospitalController.java

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+package com.peteralbus.controller;
+
+import com.peteralbus.entity.Distance;
+import com.peteralbus.entity.Hospital;
+import com.peteralbus.service.HospitalService;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.web.bind.annotation.CrossOrigin;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+import java.util.List;
+
+@CrossOrigin
+@RestController
+public class HospitalController {
+    @Autowired
+    HospitalService hospitalService;
+    @RequestMapping("/findAllHospital")
+    public List<Hospital> findAllHospital(){
+    return hospitalService.findAllHospital();
+    }
+    @RequestMapping("/calculateDistance")
+    public Distance calculateDistance(double lng, double lat){//输入经纬度的值，遍历所有Hosiptai的经纬度并比较其距离
+//        return getDistance(121.446014,31.215937,121.446028464238,31.2158502442799 );
+        System.out.print("进入函数calculate");
+        List<Hospital> hospitals=hospitalService.findAllHospital();
+        double minDistance=Double.MAX_VALUE;
+        Distance distance=new Distance();
+        for(int i=0;i<hospitals.size();i++){
+            Hospital hospital=hospitals.get(i);
+            double distanceTwoPlaces=getDistance(hospital.getLon(),hospital.getLat(),lng,lat);
+            System.out.println(distanceTwoPlaces);
+            minDistance=Math.min(minDistance,distanceTwoPlaces);
+            if(minDistance==distanceTwoPlaces){
+                distance.setDistance(minDistance);
+                distance.setEndLon(hospital.getLon());
+                distance.setEndLat(hospital.getLat());
+                distance.setEndName(hospital.getName());
+                distance.setEndAddress(hospital.getAddress());
+            }
+        }
+        distance.setStartLon(lng);
+        distance.setStartLat(lat);
+        return distance;
+    }
+    private static final double EARTH_RADIUS = 6378.137;
+    public static double getDistance(double longitude1, double latitude1, double longitude2, double latitude2) {
+        // 纬度
+        double lat1 = Math.toRadians(latitude1);
+        double lat2 = Math.toRadians(latitude2);
+        // 经度
+        double lng1 = Math.toRadians(longitude1);
+        double lng2 = Math.toRadians(longitude2);
+        // 纬度之差
+        double a = lat1 - lat2;
+        // 经度之差
+        double b = lng1 - lng2;
+        // 计算两点距离的公式
+        double s = 2 * Math.asin(Math.sqrt(Math.pow(Math.sin(a / 2), 2) +
+                Math.cos(lat1) * Math.cos(lat2) * Math.pow(Math.sin(b / 2), 2)));
+        // 弧长乘地球半径, 返回单位: 千米
+        s =  s * EARTH_RADIUS;
+        return s;
+    }
+//    Haversine公式的最终实现方式可以有多种，比如借助转角度的函数atan2：
+    public static double getDistance2(double longitude1, double latitude1,
+                                      double longitude2, double latitude2) {
+
+        double latDistance = Math.toRadians(longitude1 - longitude2);
+        double lngDistance = Math.toRadians(latitude1 - latitude2);
+
+        double a = Math.sin(latDistance / 2) * Math.sin(latDistance / 2)
+                + Math.cos(Math.toRadians(longitude1)) * Math.cos(Math.toRadians(longitude2))
+                * Math.sin(lngDistance / 2) * Math.sin(lngDistance / 2);
+
+        double c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a));
+        return c * EARTH_RADIUS;
+    }
+}

src/main/java/com/peteralbus/entity/Distance.java

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+package com.peteralbus.entity;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+@Data
+@AllArgsConstructor
+@NoArgsConstructor
+public class Distance {
+    private double startLon;
+    private double startLat;
+    private double endLon;
+    private double endLat;
+    private double distance;
+    private String endName;
+    private String endAddress;
+}

src/main/java/com/peteralbus/entity/Hospital.java

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+package com.peteralbus.entity;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+@Data
+@AllArgsConstructor
+@NoArgsConstructor
+public class Hospital {
+    private int id;
+    private double lon;
+    private double lat;
+    private String name;
+    private String address;
+    private String pname;
+    private String cityname;
+    private String type;
+}

src/main/java/com/peteralbus/mapper/HospitalMapper.java

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+package com.peteralbus.mapper;
+
+import com.peteralbus.entity.Hospital;
+import org.apache.ibatis.annotations.Mapper;
+import org.springframework.stereotype.Repository;
+
+import java.util.List;
+
+@Repository
+@Mapper
+public interface HospitalMapper {
+
+    public List<Hospital> findAllHospital();
+
+}

src/main/java/com/peteralbus/service/HospitalService.java

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+package com.peteralbus.service;
+
+import com.peteralbus.entity.Hospital;
+
+import java.util.List;
+
+public interface HospitalService {
+    public List<Hospital> findAllHospital();
+}

src/main/java/com/peteralbus/service/impl/HospitalServiceImpl.java

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+package com.peteralbus.service.impl;
+
+import com.peteralbus.entity.Hospital;
+import com.peteralbus.mapper.HospitalMapper;
+import com.peteralbus.service.HospitalService;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+
+import java.util.List;
+
+@Service
+public class HospitalServiceImpl implements HospitalService {
+    @Autowired
+    private HospitalMapper hospitalMapper;
+    @Override
+    public List<Hospital> findAllHospital() {
+        return hospitalMapper.findAllHospital();
+    }
+}

src/main/resources/mapper/HospitalMapper.xml

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+<?xml version="1.0" encoding="UTF-8" ?>
+<!DOCTYPE mapper
+        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
+        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
+
+<mapper namespace="com.peteralbus.mapper.HospitalMapper">
+
+
+    <select id="findAllHospital" resultType="com.peteralbus.entity.Hospital">
+        select * from hospital_center
+    </select>
+
+</mapper>