低纬度与地址互换，根据经纬度计算距离

Posted 2022-12-10 Biubbbbbbbbiu

1、根据地址，返回对应的经纬度

2、根据输入的经纬度，返回对应的地址

3、根据两个位置的经纬度，来计算两地的距离

直接上代码

package com.demo.jw.util.common;


import com.alibaba.fastjson.JSONObject;
import com.sun.org.apache.bcel.internal.generic.IF_ACMPEQ;
import org.apache.http.client.HttpClient;
import org.omg.CORBA.WStringSeqHelper;
import org.springframework.util.StringUtils;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLEncoder;
import java.text.MessageFormat;
import java.util.HashMap;
import java.util.Map;
import java.util.UUID;


public class LatitudeUtils 


    /**
     * 没有ak有的服务请求获取不到地址
     */
    public static final String ak = "l010vL91***ih17OfTbu8";

    private static double EARTH_RADIUS = 6378.137;

    private static double rad(double lat1) 
        return lat1 * Math.PI / 180.0;
    




    /**
     * 返回输入地址的经纬度坐标
     * key lng(经度),lat(纬度)
     */
    public static Map<String,String> getGeocoderLatitude(String address)
        BufferedReader in = null;
        try 
            //将地址转换成utf-8的16进制
            address = URLEncoder.encode(address, "UTF-8");
            URL tirc = new URL("https://api.map.baidu.com/geocoder/v2/?address="+ address +"&output=json&key="+ UUID.randomUUID().toString().replace("-","")+"&ak="+ak);


            in = new BufferedReader(new InputStreamReader(tirc.openStream(),"UTF-8"));
            String res;
            StringBuilder sb = new StringBuilder("");
            while((res = in.readLine())!=null)
                sb.append(res.trim());
            
            String str = sb.toString();
            Map<String,String> map = null;
            if(!StringUtils.isEmpty(str))
                int lngStart = str.indexOf("lng\\":");
                int lngEnd = str.indexOf(",\\"lat");
                int latEnd = str.indexOf(",\\"precise");
                if(lngStart > 0 && lngEnd > 0 && latEnd > 0)
                    String lng = str.substring(lngStart+5, lngEnd);
                    String lat = str.substring(lngEnd+7, latEnd);
                    map = new HashMap<String,String>();
                    map.put("lng", lng);
                    map.put("lat", lat);
                    return map;
                
            
        catch (Exception e) 
            e.printStackTrace();
        finally
            try 
                if(in!=null)
                    in.close();
                
             catch (IOException e) 
                e.printStackTrace();
            
        
        return null;
    
	
	    /**
     * 根据经度纬度，返回对应的地址
     * 参数为String类型
     * @param lat 经度
     * @param lng 纬度
     * @return
     */
    public static String getLocationAddress(String lat, String lng)
    
        BufferedReader in = null;
        try 
            String location = MessageFormat.format("0,1", lat, lng);
            URL tirc = null;
            tirc = new URL("https://api.map.baidu.com/geocoder/v2/?location="+location+"&output=json&ak="+ak);

            in = new BufferedReader(new InputStreamReader(tirc.openStream(),"UTF-8"));
            String res;
            StringBuilder sb = new StringBuilder("");
            while((res = in.readLine())!=null)
                sb.append(res.trim());
            
            String str = sb.toString();
            JSONObject obj = JSONObject.parseObject(str);
            if (0==obj.getInteger("status"))
                JSONObject tmp = obj.getJSONObject("result");
                if (null!=tmp)
                    return tmp.getString("formatted_address");
                
            
        catch (Exception e) 
            e.printStackTrace();
        finally
            try 
                if(in!=null)
                    in.close();
                
             catch (IOException e) 
                e.printStackTrace();
            
        
        return null;
    

    /**
     * 根据两个位置的经纬度，来计算两地的距离（单位为KM）
     * 参数为String类型
     * @param lat1Str 用户经度
     * @param lng1Str 用户纬度
     * @param lat2Str 商家经度
     * @param lng2Str 商家纬度
     * @return
     */
    public static String getDistance(String lat1Str, String lng1Str, String lat2Str, String lng2Str) 
        if(StringUtils.isEmpty(lat1Str)||StringUtils.isEmpty(lng1Str)
                ||StringUtils.isEmpty(lat2Str)||StringUtils.isEmpty(lng2Str))
            return "";
        
        double lat1 = Double.parseDouble(lat1Str);
        double lng1 = Double.parseDouble(lng1Str);
        double lat2 = Double.parseDouble(lat2Str);
        double lng2 = Double.parseDouble(lng2Str);
        double patm = 2;
        double radLat1 = rad(lat1);
        double radLat2 = rad(lat2);
        double difference = radLat1 - radLat2;
        double mdifference = rad(lng1) - rad(lng2);
        double distance = patm * Math.asin(Math.sqrt(Math.pow(Math.sin(difference / patm), patm)
                + Math.cos(radLat1) * Math.cos(radLat2)
                * Math.pow(Math.sin(mdifference / patm), patm)));
        distance = distance * EARTH_RADIUS;
        String distanceStr = String.valueOf(distance);
        return distanceStr;
    

    public static void main(String args[])
        try 
            Map<String, String> json = LatitudeUtils.getGeocoderLatitude("武汉市汉口火车站");
            System.out.println("经度 : " + json.get("lng"));
            System.out.println("纬度 : " + json.get("lat"));
        catch (Exception e )
            e.printStackTrace();