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How to use Java code to implement click events on Baidu Maps and obtain weather information for the clicked location?

王林

Jul 30, 2023 pm 10:21 PM

javaBaidu mapclick event

How to use Java code to implement click events on Baidu Maps and obtain weather information at the clicked location?

Baidu Maps is one of the largest map service providers in China, providing a wealth of map functions and API interfaces for developers to use. In many application scenarios, we need to obtain relevant information, such as weather information, based on the user's click location. This article will introduce how to use Java code to implement click events on Baidu Maps and obtain weather information at the click location.

First, we need to apply for an API key on the Baidu Map Open Platform. After the application is successful, we can use Baidu Map's JavaScript API to implement click events, and pass the latitude and longitude of the clicked location to the Java backend through JavaScript code to obtain weather information.

The following is a simple sample code:

Write HTML page

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>百度地图点击事件示例</title>
    <script src="http://api.map.baidu.com/api?v=2.0&ak=您的API密钥"></script>
</head>
<body>
    <div id="map" style="width: 100%; height: 500px;"></div>
    <script>
        // 创建地图实例
        var map = new BMap.Map("map");
        // 初始化地图，设置中心点和缩放级别
        map.centerAndZoom(new BMap.Point(116.404, 39.915), 11);

        // 设置地图点击事件
        map.addEventListener("click", function(e){
            // 获取点击位置的经纬度
            var point = e.point;
            // 将经纬度传递给Java后台
            window.location.href = "http://localhost:8080/getWeather?lng=" + point.lng + "&lat=" + point.lat;
        });
    </script>
</body>
</html>

Create Java background interface

Create an interface in the Java background, listen to the GET request of the "/getWeather" path, and obtain weather information based on the passed longitude and latitude parameters. You can use third-party weather API interfaces to obtain weather data, such as Zefeng Weather.

The following is a simple sample code:

@RestController
public class WeatherController {

    @GetMapping("/getWeather")
    public String getWeather(@RequestParam("lng") double lng, @RequestParam("lat") double lat) {
        // 使用第三方天气API接口获取天气信息
        // 例如使用和风天气接口，需要注册并获取API密钥
        // 然后发送HTTP请求，并根据经纬度获取天气数据
        String url = "https://free-api.heweather.com/s6/weather/now?location=" + lat + "," + lng + "&key=您的API密钥";
        String weatherData = sendHttpRequest(url);

        // 解析天气数据，提取所需信息
        // ...

        return "天气信息：" + weatherData;
    }

    private String sendHttpRequest(String url) {
        // 发送HTTP请求并获取天气数据
        // ...
    }
}

It should be noted that the part of obtaining weather information here is not a complete implementation and is only shown as a sample code. In actual development, it is necessary to write corresponding logic according to the specific weather API interface document to obtain weather data, and perform operations such as error handling and data analysis.

Through the above steps, we can use Java code to realize the click event on Baidu Map and obtain the weather information of the click location. Developers can further expand and optimize the code according to specific needs to achieve richer functions.

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