根据经纬度查询最近距离，mysql查询经纬度附近范围

Posted 2022-02-20 tomingto

public class Test

    private static List<LocalAddress> ilist = new ArrayList<LocalAddress>();
    public static void main(String[] args) 
        Test test3 = new Test();
        Double localDouble  = 0.0;

        //定义一个二维数组存放经纬度
        Double[][] doubles = 
                 22.6036906766, 113.8793209706 , //雍华源
                 22.5205569549, 113.9394272419 , //西海湾花园
                 22.6494305358, 114.0411629507 , //世纪春城4期
                 22.5255080247,114.0384880750 ,  //金海湾花园
                 22.5246432654,114.0720634923 ,   //金港豪庭
                 22.5963291708,113.9689558477 ,   //得意名居
                 22.5509638661,113.9358124450 ,   //麒麟花园A区西门
                 22.5509638661,113.9358124450 ,   //麒麟花园A区北门
                 22.5254496086,114.0555439122 ,   //裕康时尚名居
                 22.7789489191,114.3063672776 ,   //桑泰丹华园
                 22.5240537775,114.0641924822 ,   //皇庭彩园
                 22.5141408858,114.0624887496  ; //城市3米6

        //门店的经纬度
        Double[] initlocal = 22.539899298946577,113.95296375395431 ;


        for (int i = 0; i < doubles.length; i++) 
            System.out.println("doubles.length==============="+doubles.length);
            System.out.println("(" + doubles[i][0] + "," + doubles[i][1] + ")");
            Double z = test3.getDistance(doubles[i][0], doubles[i][1],initlocal[0], initlocal[1]);
            System.out.println(z);
            //获取最短距离后把经纬度和距离存放到对象中
            LocalAddress localaddress = new LocalAddress(doubles[i][0], doubles[i][1], z);
            //将对象用list保存
            ilist.add(localaddress);
        

        List<LocalAddress> shotlocal =  getLocalList();
        Double lat=shotlocal.get(0).getLat();
        Double lon= shotlocal.get(0).getLon();
        localDouble = shotlocal.get(0).getDistance();
        System.err.println("最近的距离：" + localDouble + "。对应的经纬是：" +"(" + lat + "," + lon + ")");
    

    /*第一种求最近距离 ===================================================*/
    /**
     * 获取最短的距离
     * @param lat
     * @param lon
     * @param initlat
     * @param initlon
     * @return
     */
    public Double GetShotLocal(Double lat, Double lon, Double initlat,Double initlon) 
        Double x = (initlat - lat) * (initlat - lat);
        Double y = (initlon - lon) * (initlon - lon);
        Double z = Math.sqrt(x + y);
        return z;
    

    /**
     * 对List<LocalAddress> 进行排序
     * @return
     */
    public static List<LocalAddress> getLocalList()  
        Collections.sort(ilist, new Comparator<LocalAddress>() 
            @Override
            public int compare(LocalAddress arg0, LocalAddress  arg1) 
                Double double1 = arg0.getDistance();
                Double double2 = arg1.getDistance();
                if(double1>double2)
                    return 1;
                else if (double1 == double2) 
                    return 0;
                else 
                    return -1;
                
            
        );
        return ilist;
    

/*    第二种求最近距离                         ==================================================================*/
    private static final double EARTH_RADIUS = 6378.137;//地球半径,单位千米
    private static double rad(double d)
    
        return d * Math.PI / 180.0;
    

    /**
     *
     * @param lat1 第一个纬度
     * @param lng1 第一个经度
     * @param lat2 第二个纬度
     * @param lng2 第二个经度
     * @return 两个经纬度的距离
     */
    public static double getDistance(double lat1,double lng1,double lat2,double lng2)
    
        double radLat1 = rad(lat1);
        double radLat2 = rad(lat2);
        double a = radLat1 - radLat2;
        double b = rad(lng1) - rad(lng2);

        double s = 2 * Math.asin(Math.sqrt(Math.pow(Math.sin(a/2),2) +
                Math.cos(radLat1)*Math.cos(radLat2)*Math.pow(Math.sin(b/2),2)));
        s = s * EARTH_RADIUS;
        s = Math.round(s * 10000) / 10000;
        return s;

    






entity

public class LocalAddress 

    private Double lat;     //纬度
    private Double lon;     //经度
    private Double distance;    //最近距离

    public LocalAddress() 
        // TODO Auto-generated constructor stub
    

    public LocalAddress(Double lat, Double lon, Double distance) 
        super();
        this.lat = lat;
        this.lon = lon;
        this.distance = distance;
    
    

<!--根据经纬度查询最近距离范围-->
<select id="SelectDistanceByLat" parameterType="map" resultType="map">
   SELECT
   *,(
   6371 * acos (
   cos ( radians(#lat) )
   * cos( radians( lat ) )
   * cos( radians( lng ) - radians(#lng) )
   + sin ( radians(#lat) )
   * sin( radians( lat ) )
   )
   ) AS distance
   FROM machine
   HAVING   3 > distance
   ORDER BY distance
   LIMIT 0 , 20;
</select>