Tutorial: How Java developers call Amap static map API in projects

Tutorial: How Java developers call the Amap static map API in projects

Introduction:
With the development of the mobile Internet, map applications have attracted more and more attention. As one of the leading map service providers in China, Amap provides developers with a rich map API. In this tutorial, we will introduce how to call Amap’s static map API in a Java project and provide code examples.

1. Register an account on the AutoNavi open platform and create an application:
First, we need to register an account on the AutoNavi open platform and create an application. After registering an account, click "My Apps" and select "Create New App". Fill in the application name and icon, and select the API permissions of the Amap open platform.

2. Obtain the API key of the open platform:
After the application is successfully created, we can find the corresponding API key on the "My Application" page. This key is a key parameter for calling the Amap API and must be kept properly.

3. Import related dependencies and configurations:
Next, import relevant dependencies and configurations into the Java project. We use Maven as the project construction tool and add the following dependencies to the pom.xml file:

<dependency>
    <groupId>com.squareup.okhttp3</groupId>
    <artifactId>okhttp</artifactId>
    <version>4.9.1</version>
</dependency>

In the project configuration file, add the following configuration items:

amap.api.url=https://restapi.amap.com
amap.api.key=你的API密钥

4. Write and call the static map API code:
First, we need to splice the request URL and parameters of the static map API of Amap. For specific parameters, please refer to the documentation of Amap Static Map API. The following is a sample code:

import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.Response;

import java.io.FileOutputStream;
import java.io.IOException;

public class StaticMapExample {
    
    private static final OkHttpClient client = new OkHttpClient();
    private static final String baseUrl = "https://restapi.amap.com/v3/staticmap?";

    public static void main(String[] args) {
        String center = "116.397428,39.90923"; // 地图中心点经纬度
        int zoom = 10; // 地图缩放级别
        String size = "500*300"; // 地图大小
        String apiKey = "你的API密钥";

        String requestUrl = baseUrl + "key=" + apiKey + "&location=" + center + "&zoom=" + zoom + "&size=" + size;

        try {
            Request request = new Request.Builder()
                    .url(requestUrl)
                    .build();
            Response response = client.newCall(request).execute();
            byte[] bytes = response.body().bytes();

            FileOutputStream fos = new FileOutputStream("map.png"); // 将地图保存为本地文件
            fos.write(bytes);
            fos.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

In the above code, we use OkHttp to initiate an HTTP request and save the returned map data as a local file.

5. Run the code and view the effect:
After completing the code writing, we can run the code directly and view the generated map effect. After the code runs successfully, a map file named map.png will be generated in the root directory of the project.

Conclusion:
This article introduces how to call the static map API of Amap in a Java project and provides corresponding code examples. Through this tutorial, I hope to help Java developers better use Amap’s services and add map functions to their applications.

Reference link:

• AMAP Open Platform: https://developer.amap.com/
• Amap Static Map API: https:// lbs.amap.com/api/webservice/guide/tools/staticmaps

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