Dalam API Peta Baidu, bagaimana untuk menggunakan Java untuk mendapatkan maklumat laluan kereta api bawah tanah di lokasi yang ditentukan?

<dependencies>
  <dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>fastjson</artifactId>
    <version>1.2.47</version>
  </dependency>
  <dependency>
    <groupId>org.apache.httpcomponents</groupId>
    <artifactId>httpclient</artifactId>
    <version>4.5.9</version>
  </dependency>
</dependencies>

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.HashMap;
import java.util.Map;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONArray;
import com.alibaba.fastjson.JSONObject;

public class BaiduMapAPI {
    
    public static void main(String[] args) {
        String url = "http://api.map.baidu.com/place/v2/search?query=地铁站&location=40.057406,116.296440&radius=2000&output=json&ak=Your_AK";
        
        String result = sendHttpRequest(url);
        Map<String, String> subwayLines = parseSubwayLines(result);
        
        System.out.println("地铁线路信息：");
        for (String lineName : subwayLines.keySet()) {
            System.out.println(lineName + "：" + subwayLines.get(lineName));
        }
    }
    
    private static String sendHttpRequest(String urlString) {
        try {
            URL url = new URL(urlString);
            HttpURLConnection connection = (HttpURLConnection) url.openConnection();
            connection.setRequestMethod("GET");
            connection.setConnectTimeout(5000);
            connection.setReadTimeout(5000);
            
            int responseCode = connection.getResponseCode();
            if (responseCode == HttpURLConnection.HTTP_OK) {
                BufferedReader in = new BufferedReader(new InputStreamReader(connection.getInputStream()));
                String line;
                StringBuilder response = new StringBuilder();
                while ((line = in.readLine()) != null) {
                    response.append(line);
                }
                in.close();
                
                return response.toString();
            } else {
                System.out.println("HTTP请求失败，错误码：" + responseCode);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        
        return null;
    }
    
    private static Map<String, String> parseSubwayLines(String json) {
        Map<String, String> subwayLines = new HashMap<>();
        JSONObject jsonObject = JSON.parseObject(json);
        
        JSONArray results = jsonObject.getJSONArray("results");
        for (int i = 0; i < results.size(); i++) {
            JSONObject result = results.getJSONObject(i);
            
            String name = result.getString("name");
            String detail = result.getString("detail_info");
            
            subwayLines.put(name, detail);
        }
        
        return subwayLines;
    }
}