How to call the Amap API through Java code to implement popular city recommendations for administrative division query

How to call the Amap API through Java code to implement popular city recommendations for administrative division query

Introduction:
Amap provides a rich API interface, among which the administrative division query interface can help us implement For inquiries about city administrative divisions, some popular cities can be recommended based on needs. This article will introduce how to call the Amap API through Java code to implement popular city recommendations for administrative division query.

Step 1: Apply for an AutoNavi developer account and obtain the API Key
First, we need to register a developer account on the AutoNavi official website and create an application to obtain the API Key. After obtaining the API Key, we can use the Key to make API calls.

Step 2: Import the relevant jar package
We need to import the java-sdk of the Amap Map API. The jar package can be downloaded from the official website of the Amap Open Platform and imported into the Java project.

Step 3: Call the administrative division query interface to query popular cities
We can query popular cities based on demand through the administrative division query interface of the Amap API. The following is an example of using Java code to call the Amap API to implement administrative division query:

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();
    }
}

In the example, we use the buildQueryUrlString method to build the requested URL by specifying keywords For "China", query the administrative division information of China. In actual use, we can modify the keywords according to needs to query other cities.

In the output results, we can see that JSON data containing popular city information is returned. By parsing JSON data, we can obtain the names of popular cities, administrative division codes and other information.

Summary:
It is a very useful function to call the Amap API through Java code to implement popular city recommendations for administrative division query. Through the above steps and sample code, we can quickly build a popular city recommendation function based on the Amap API to meet the needs of various applications.

The above is the detailed content of How to call the Amap API through Java code to implement popular city recommendations for administrative division query. For more information, please follow other related articles on the PHP Chinese website!