How to call the Amap API through Java code to implement the surrounding search function

How to call the Amap API through Java code to implement the surrounding search function

Introduction:
When developing web applications or mobile applications, it is often necessary to call the map API to implement some geographical location-related functions. Amap API provides a wealth of functions and interfaces, including surrounding search functions. This article will introduce how to call the Amap API through Java code to implement the surrounding search function, and attach detailed code examples.

1. Understand the Amap Map API
The Amap Map API is a set of interfaces based on the HTTP/HTTPS protocol, which provides geographical information-related functions such as maps, location search, and route planning. To use the Amap API, you first need to apply for a developer account and obtain a developer key.

2. Introduce relevant dependencies
In Java projects, we can use a third-party HTTP request library to call the Amap API. For example, you can use Apache's HttpClient library to send HTTP requests and parse the returned results. Relevant libraries need to be introduced into the project's dependencies so that the functions of these libraries can be used.

Code example:
Before using the HttpClient library, you need to introduce the following dependencies in the project's pom.xml file:

<dependency>
    <groupId>org.apache.httpcomponents</groupId>
    <artifactId>httpclient</artifactId>
    <version>4.5.13</version>
</dependency>

3. Write code to implement the surrounding search function
Below It is a simple example that demonstrates how to call the Amap API through Java code to implement the surrounding search function. The function implemented by the code is to search for restaurants near the specified coordinates and return the names and addresses of the search results.

import java.io.IOException;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;
import org.json.JSONArray;
import org.json.JSONObject;

public class NearbySearchExample {

    public static void main(String[] args) {
        String apiUrl = "https://restapi.amap.com/v3/place/around?key=YOUR_KEY&location=116.397428,39.90923&keywords=餐馆&types=&radius=1000&offset=20&page=1&extensions=all";

        HttpClient httpClient = HttpClients.createDefault();
        HttpGet httpGet = new HttpGet(apiUrl);

        try {
            HttpResponse response = httpClient.execute(httpGet);
            HttpEntity entity = response.getEntity();
            String responseStr = EntityUtils.toString(entity, "UTF-8");

            JSONObject responseJson = new JSONObject(responseStr);
            JSONArray poisArray = responseJson.getJSONArray("pois");

            for (int i = 0; i < poisArray.length(); i++) {
                JSONObject poiObject = poisArray.getJSONObject(i);
                String name = poiObject.getString("name");
                String address = poiObject.getString("address");

                System.out.println("名称：" + name);
                System.out.println("地址：" + address);
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

Code analysis:

1. In the apiUrl variable in the code, replace YOUR_KEY with the developer key you applied for in the Amap API.
2. Send a GET request through HttpClient and get the returned result.
3. Parse the returned JSON data and extract key information such as name and address.
4. Print the name and address of the search results.

4. Run the code and view the results
Paste the code into the Java project and replace YOUR_KEY with your developer key. Run the code to see the search results output, including the name and address of the restaurant.

Summary:
This article introduces how to call the Amap API through Java code to implement the surrounding search function. First, we learned about the basic use of the Amap API. Then, we introduced relevant dependencies and wrote code to implement the surrounding search function. Finally, we ran the code and viewed the search results. Through this simple example, you can learn how to call the Amap API to implement other geographical location-related functions.

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