How to use Java code to find a specified type of surrounding business district through the location search API on Baidu Maps?

How to use Java code to find a specified type of surrounding business district through the location search API on Baidu Maps?

Introduction:
In modern society, people have become very important for information about the surrounding business districts. Whether it is travel or business inspection, knowing the situation of the surrounding business districts can provide a lot of convenience. Baidu Maps provides a location retrieval API that allows us to obtain business district information around a specified location through programming. This article will introduce how to implement this function using Java code.

Prerequisite preparation:
Before using Baidu Map API, we need to go to Baidu Open Platform (http://lbsyun.baidu.com/) to register, create an application, and obtain the corresponding developer key(ak). After obtaining the developer key, we can use the services provided by Baidu Map API.

Step 1: Import related dependencies
First, we need to import the relevant dependency packages in the Java project to implement the call to Baidu Map API. Add the following dependency content in the pom.xml file:

<dependency>
    <groupId>org.apache.httpcomponents</groupId>
    <artifactId>httpclient</artifactId>
    <version>4.5.9</version>
</dependency>
<dependency>
    <groupId>com.google.code.gson</groupId>
    <artifactId>gson</artifactId>
    <version>2.8.5</version>
</dependency>

Step 2: Write a tool class
Next, we will write a tool class to call the Baidu Map API and parse the returned results. In this tool class, we need to implement the following methods:

import com.google.gson.Gson;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.HttpClientBuilder;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.URLEncoder;

public class BaiduMapUtils {
    private static final String AK = "your_ak";

    public static String searchAround(String query, String location) {
        HttpClient client = HttpClientBuilder.create().build();
        try {
            query = URLEncoder.encode(query, "UTF-8");
        } catch (IOException e) {
            e.printStackTrace();
        }
        String url = "http://api.map.baidu.com/place/v2/search?query=" + query + "&location=" + location + "&radius=2000&output=json&ak=" + AK;
        HttpGet request = new HttpGet(url);
        try {
            HttpResponse response = client.execute(request);
            BufferedReader rd = new BufferedReader(new InputStreamReader(response.getEntity().getContent()));
            StringBuilder result = new StringBuilder();
            
            String line;
            while ((line = rd.readLine()) != null) {
                result.append(line);
            }
            
            return result.toString();
        } catch (IOException e) {
            e.printStackTrace();
        }
        
        return null;
    }

    public static void main(String[] args) {
        String result = searchAround("美食", "31.12345,121.67890");
        Gson gson = new Gson();
        PlaceSearchResponse response = gson.fromJson(result, PlaceSearchResponse.class);
        if (response.getStatus() == 0) {
            for (PlaceSearchResponse.Result result : response.getResults()) {
                System.out.println(result.getName());
            }
        }
    }
}

In the above code, we first define a constant AK to store the developer key. Then, we use HttpClient to send an HTTP request and use the HttpGet method to obtain the returned result. Finally, use Gson to parse the returned results and output the business district name.

Step 3: Compile and run
After completing the above code writing, we need to compile and run the program. Follow the steps below to complete:

1. Open the command line or terminal;
2. Enter the directory where the project is located;
3. Execute the following command to compile:

mvn clean package

4. After successful compilation, execute the following command to run the program:

java -jar target/your_jar_name.jar

After completing the above steps, we can see the returned business district name on the console.

Summary:
Through the introduction of this article, we have learned how to use Java code to find specified types of surrounding business districts through the location search API on Baidu Maps. With just a few simple steps, we can obtain information about surrounding business districts through programming, bringing convenience to our lives and work. Hope this article helps you!

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