A must-read for Java developers: How to obtain sub-level administrative areas for Administrative Division Query on Amap

Must-read for Java developers: How to obtain the sub-level administrative areas of Amap administrative division query

Introduction:
When developing map-related applications, obtain the list of sub-level administrative areas for a specific administrative area is a common requirement. Amap provides a wealth of APIs and SDKs to meet the needs of developers. This article will introduce how to use the Amap API to query the sub-administrative regions of a specified administrative region, and provide corresponding Java code examples.

Text:
To obtain the sub-administrative areas of a specified administrative area, we first need to obtain the adcode of the administrative area. adcode is the administrative area code of Amap, and each administrative area has a unique adcode. Next, we can use the API of Amap to query.

First, we need to import the corresponding Java libraries and classes:

import java.net.HttpURLConnection;
import java.net.URL;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.IOException;

Then, we can define a method to get the sub-administrative regions of the specified administrative region:

public static String getChildDistricts(String adcode) throws IOException {
    // 构建URL
    String url = "https://restapi.amap.com/v3/config/district?key=YOUR_API_KEY&subdistrict=1&keywords=" + adcode;

    // 发送HTTP请求
    HttpURLConnection connection = (HttpURLConnection) new URL(url).openConnection();
    connection.setRequestMethod("GET");

    // 获取响应结果
    int responseCode = connection.getResponseCode();
    StringBuilder response = new StringBuilder();
    BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream()));
    String line;
    while ((line = reader.readLine()) != null) {
        response.append(line);
    }
    reader.close();

    return response.toString();
}

In In the above code, we use the administrative area query API of Amap. It should be noted that YOUR_API_KEY needs to be replaced in the URL with your own Amap API key. subdistrict=1 is used to specify the subdistrict. keywordsThe parameter is used to specify the adcode of the parent administrative region.

Next, we can call this method in the main function for testing:

public static void main(String[] args) {
    try {
        String adcode = "110000"; // 以北京市为例
        String result = getChildDistricts(adcode);
        System.out.println(result);
    } catch (IOException e) {
        e.printStackTrace();
    }
}

In the above code, we specify the adcode of Beijing (110000), and then call getChildDistricts Method to obtain the sub-level administrative districts of Beijing. Finally, we print out the query results.

Run the above code and you will get a string in JSON format containing the sub-administrative region. You can parse this string as needed to obtain specific sub-administrative district information.

Conclusion:
By using the API of Amap, we can easily obtain the list of sub-administrative regions of a specified administrative region. This article provides corresponding Java code examples to help developers quickly implement this function. I hope it will be helpful to Java developers in map application development.

Note:
When using the Amap API, you need to replace YOUR_API_KEY in the code with your own API key. API keys can be applied for and obtained on the AMAP open platform.

Reference materials:

• AMAP open platform document: https://lbs.amap.com/api/webservice/guide/api/district

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