Tutorial: Steps to implement the weather query function of AMAP in Java development

Tutorial: Steps to implement the weather query function of Amap using Java

Introduction:
With the rapid development of the mobile Internet, map applications have become one of the indispensable tools in people's lives. The weather query function can help users better understand current and future weather conditions. This tutorial will teach you how to use Java to develop and implement the weather query function of Amap.

1. Preparation

1. Apply for a developer account on the Amap open platform and obtain the corresponding developer Key.
2. Make sure the computer has the Java development environment (JDK) and development tools (IDE, such as Eclipse) installed.
3. Import Amap SDK and introduce related dependencies.

2. Obtain weather information

1. Introduce the necessary packages:

   import com.alibaba.fastjson.JSONArray;
   import com.alibaba.fastjson.JSONObject;
   import java.io.BufferedReader;
   import java.io.InputStreamReader;
   import java.net.HttpURLConnection;
   import java.net.URL;

2. Create a method for sending HTTP request to obtain weather information:

   public static JSONObject getWeatherInfo(String adcode, String key) throws Exception {
    String url = "https://restapi.amap.com/v3/weather/weatherInfo";
    String requestUrl = url + "?key=" + key + "&city=" + adcode;
    
    URL obj = new URL(requestUrl);
    HttpURLConnection con = (HttpURLConnection) obj.openConnection();
    con.setRequestMethod("GET");
    
    BufferedReader in = new BufferedReader(new InputStreamReader(con.getInputStream(), "UTF-8"));
    String inputLine;
    StringBuilder response = new StringBuilder();
    
    while ((inputLine = in.readLine()) != null) {
        response.append(inputLine);
    }
    in.close();
    
    JSONObject result = JSONObject.parseObject(response.toString());
    return result;
   }

   3. Parse and display weather information

3. Call the above method in the main function to obtain weather information:

   public static void main(String[] args) {
    try {
        String adcode = "城市编码"; // 例如：110000（北京市）
        String key = "你的开发者Key";
   
        JSONObject weatherInfo = getWeatherInfo(adcode, key);
        JSONArray forecasts = weatherInfo.getJSONArray("forecasts");
        JSONObject todayForecast = forecasts.getJSONObject(0);
        JSONArray casts = todayForecast.getJSONArray("casts");
        
        for (int i = 0; i < casts.size(); i++) {
            JSONObject cast = casts.getJSONObject(i);
            String date = cast.getString("date");
            String week = cast.getString("week");
            String dayWeather = cast.getString("dayweather");
            String nightWeather = cast.getString("nightweather");
            
            System.out.println(date + " " + week + " " + dayWeather + "转" + nightWeather);
        }
    } catch (Exception e) {
        e.printStackTrace();
    }
   }

4. Run the program to output the weather information for the day on the console.

Summary:
Through the study of this tutorial, we have mastered how to use Java to develop and implement the weather query function of Amap. As long as you obtain the corresponding developer Key, city code, and introduce the relevant AutoNavi SDK and dependencies, you can obtain weather information by sending an HTTP request, parse it, and display it. Developers can expand and optimize according to actual needs, such as implementing weather warning functions, setting city switching, etc., to improve user experience.

Reference materials:

• Official document of AMAP open platform: https://lbs.amap.com/api/webservice/guide/api/weatherinfo

The above is the detailed content of Tutorial: Steps to implement the weather query function of AMAP in Java development. For more information, please follow other related articles on the PHP Chinese website!