如何通过Java代码调用高德地图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();
    }
}