In Baidu Map API, how to use Java to obtain a static map image of a specified location?

In Baidu Map API, how to use Java to obtain a static map image of a specified location?

Baidu Map is a very popular map application that provides a wealth of geographical location information and services. One useful feature is to get a static map image of a specified location. Through the Baidu Map API, we can use the Java programming language to implement this function.

First, we need to register a developer account on Baidu Open Platform and create an application. After creating the application, we will get an API Key, which is our authentication credential for accessing the Baidu Map API.

Next, we need to use a Java program to access the Baidu Map API and obtain static map images. We can use Java's HTTPURLConnection class to send HTTP requests and receive responses.

The following is a sample code that shows how to use Java to obtain a static map image of a specified location:

import java.io.*;
import java.net.HttpURLConnection;
import java.net.URL;

public class BaiduMapAPIExample {
    public static void main(String[] args) {
        String location = "39.988563,116.473176"; // 指定的位置（纬度,经度）
        int width = 400; // 图片宽度
        int height = 300; // 图片高度
        int zoom = 15; // 缩放级别
        String apiKey = "your_api_key"; // 替换成你的API Key

        String requestUrl = "http://api.map.baidu.com/staticimage/v2?ak=" + apiKey
                + "&center=" + location + "&width=" + width + "&height=" + height + "&zoom=" + zoom;

        try {
            URL url = new URL(requestUrl);
            HttpURLConnection connection = (HttpURLConnection) url.openConnection();
            connection.setRequestMethod("GET");
            connection.setConnectTimeout(5000); // 设置连接超时时间
            connection.setReadTimeout(5000); // 设置读取超时时间

            int responseCode = connection.getResponseCode();
            if (responseCode == HttpURLConnection.HTTP_OK) {
                InputStream inputStream = connection.getInputStream();
                FileOutputStream outputStream = new FileOutputStream("map.png"); // 图片保存路径
                byte[] buffer = new byte[1024];
                int len;
                while ((len = inputStream.read(buffer)) != -1) {
                    outputStream.write(buffer, 0, len);
                }
                outputStream.close();
                inputStream.close();
                System.out.println("静态地图图片下载完成！");
            } else {
                System.out.println("请求失败：" + responseCode);
            }
            connection.disconnect();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

In the above code, we first define the specified location, image width, and image height , zoom level and API Key related variables. We then constructed the request URL and created an HTTPURLConnection object using the URL object. Next, we set the connection timeout and read timeout, and sent a GET request.

After getting the response, we check the status code of the response. If the status code is 200, it means the request is successful, and we write the response InputStream to a local file and save the static map image. Finally, we close the input stream and output stream and print out the download completion prompt. If the status code is not 200, a message indicating that the request failed will be printed.

The above is a method to obtain a static map image of a specified location through a Java program. By consulting the Baidu Map API documentation, we can learn that there are more parameters that can be set to meet different needs. I hope the sample code provided in this article can help you easily implement the function of obtaining Baidu Map static map images in Java.

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