Java代码如何利用高德地图API实现行政区划查询的热门城市推荐

import java.net.URLEncoder;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
 
public class AMapCityQuery {
  private static final String API_KEY = "YOUR_API_KEY";
   
  public static void main(String[] args) {
    String queryUrlString = buildQueryUrlString();
     
    try {
      URL queryUrl = new URL(queryUrlString);
      HttpURLConnection connection = (HttpURLConnection) queryUrl.openConnection();
      connection.setRequestMethod("GET");
       
      int responseCode = connection.getResponseCode();
       
      if (responseCode == HttpURLConnection.HTTP_OK) {
        BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream()));
        StringBuilder response = new StringBuilder();
        String line;
         
        while ((line = reader.readLine()) != null) {
          response.append(line);
        }
         
        reader.close();
         
        System.out.println(response.toString());
      } else {
        System.out.println("Error: " + responseCode);
      }
    } catch (Exception e) {
      e.printStackTrace();
    }
  }
   
  private static String buildQueryUrlString() {
    StringBuilder urlStringBuilder = new StringBuilder();
    urlStringBuilder.append("https://restapi.amap.com/v3/config/district?");
    urlStringBuilder.append("key=").append(API_KEY);
    urlStringBuilder.append("&keywords=").append(URLEncoder.encode("中国", "UTF-8"));
    urlStringBuilder.append("&subdistrict=").append("1");
    urlStringBuilder.append("&extensions=").append("base");
     
    return urlStringBuilder.toString();
  }
}