Tutorial: Java development steps to implement the traffic restriction data query function in Amap route planning

Tutorial: Steps to implement the restricted data query function in Java development of Amap route planning

Introduction: Amap is one of the leading map application and navigation service providers in China and has a wide range of applications scenes and functions. Among them, route planning is one of its common functions. However, in the actual development process, querying the traffic restriction data of a certain location is a very practical function. This tutorial will introduce how to use Java programming language to develop the traffic limit data query function in Amap route planning.

1. Preparation work
1. Install Java development environment: Make sure that JDK has been correctly installed in the system, such as JDK 8 version.
2. Obtain the Amap route planning API key: Register an account on the Amap open platform and apply for the API key. After obtaining the key, keep it for future use.

2. Create a Java project
1. Create a new Java project: Open the Java development environment, create a new Java project, and name it "AmMapDemo".
2. Import the Amap API dependency library: Import the JavaSDK library of the Amap API into the project to ensure that the related functions of the Amap can be used normally.

3. Implement traffic restriction data query
1. Import the necessary class libraries:

import com.alibaba.fastjson.JSONObject;
import com.amap.api.services.core.AMapException;
import com.amap.api.services.traffic.TrafficService;
import com.amap.api.services.traffic.TrafficServiceTrafficRestrictionsRequest;
import com.amap.api.services.vehicle.VehicleInfo;

2. Build a TrafficService instance:

TrafficService trafficService = new TrafficService();

3. Create a TrafficServiceTrafficRestrictionsRequest object, and Set request parameters (city, request time and vehicle information):

TrafficServiceTrafficRestrictionsRequest request = new TrafficServiceTrafficRestrictionsRequest();
request.setCity("北京");
request.setRestrictionsTime("2022-10-01 10:30:00");
VehicleInfo vehicleInfo = new VehicleInfo();
vehicleInfo.setVehicleRestriction("1000-3000,6");
request.setVehicleInfo(vehicleInfo);

Description: In the above example, the query of traffic restriction data at 10:30:00 on October 1, 2022 in Beijing is set up, and the vehicle is specified information. Among them, "1000-3000,6" represents the tail number of the vehicle. Vehicles with tail numbers limited to 1xxx-3xxx and 6xxx are not allowed to pass.

4. Initiate a traffic restriction data query request:

JSONObject resultJson = null;
try {
    resultJson = trafficService.getTrafficRestrictions(request, apikey);
} catch (AMapException e) {
    e.printStackTrace();
}

Description: Initiate a traffic restriction data query request through the getTrafficRestrictions method, and store the returned results in the resultJson object.

5. Parse the query results:

if (resultJson != null) {
    if ("1".equals(resultJson.getString("status"))) {
        JSONObject restrictionsJson = resultJson.getJSONObject("restrictions");
        System.out.println("查询成功！");
        System.out.println("限行区域：" + restrictionsJson.getString("area"));
        System.out.println("限行时间：" + restrictionsJson.getString("datetime"));
        System.out.println("限行尾号：" + restrictionsJson.getString("num"));
        System.out.println("限行原因：" + restrictionsJson.getString("reason"));
    } else {
        System.out.println("查询失败！");
    }
}

Description: By parsing the returned JSON data, information such as the restricted area, restricted time, restricted tail number, and restricted reason are obtained, and output on the console. .

4. Run the program
1. Call the implementation method of line-limited data query in the Main method:

public static void main(String[] args) {
    String apikey = "your_api_key";
    queryTrafficRestrictions(apikey);
}

Instructions: Replace "your_api_key" with the Amap API password you just applied for key.

2. Run the program and view the row limit data query results output by the console.

Summary:
This tutorial introduces how to use Java programming language to develop the traffic limit data query function in Amap route planning. First, you need to import the JavaSDK library of Amap API and create a TrafficService instance. Then set the request parameters through the TrafficServiceTrafficRestrictionsRequest object and initiate a traffic restriction data query request. Finally, the query results are parsed to obtain information such as the restricted area, restricted time, last number, and reason for restricted traffic, and are output on the console. Through studying this tutorial, I believe that readers have mastered the implementation method of using Java to develop the traffic limit data query function in Amap route planning.

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