An introduction to the longitude and latitude conversion tool using Java to develop the Amap API

Introduction to using Java to develop the longitude and latitude conversion tool of Amap API

1. Background introduction

Map services are becoming more and more important in modern application development, and longitude and latitude are used as identifiers of geographical location. Conversion is often required during development. Amap is one of the most popular map services in China and provides a wealth of APIs for developers to use. This article will introduce the use of Java to develop the latitude and longitude conversion tool for the AMAP Map API to facilitate developers to perform coordinate conversion operations in applications.

2. Amap API longitude and latitude conversion tool

Amap provides interfaces such as geocoding and regeocoding, which can realize the conversion between longitude, latitude and address. . By writing corresponding code in Java, you can easily convert longitude and latitude into geographical location information or convert geographical location information into longitude and latitude.

First of all, we need to introduce the Amap Java SDK. You can introduce the following dependencies through the Maven build tool:

<dependency>
    <groupId>com.amap.api</groupId>
    <artifactId>amap-geocoder</artifactId>
    <version>1.2.0</version>
</dependency>

Next, we write a simple tool class to implement the longitude and latitude conversion function, as follows This is a code example:

import com.amap.api.maps.CoordinateConverter;
import com.amap.api.maps.model.LatLng;

public class CoordinateConvertUtils {

    /**
     * 将WGS84坐标转换为高德坐标
     * @param latLng 待转换的坐标
     * @return 转换后的坐标
     */
    public static LatLng wgs84ToAmap(LatLng latLng) {
        CoordinateConverter converter = new CoordinateConverter();
        converter.from(CoordinateConverter.CoordType.GPS);
        converter.coord(latLng);
        return converter.convert();
    }

    /**
     * 将高德坐标转换为WGS84坐标
     * @param latLng 待转换的坐标
     * @return 转换后的坐标
     */
    public static LatLng amapToWgs84(LatLng latLng) {
        CoordinateConverter converter = new CoordinateConverter();
        converter.from(CoordinateConverter.CoordType.GPS);
        converter.coord(latLng);
        converter.coordType(CoordinateConverter.CoordType.GPS);
        return converter.convert();
    }
}

In the above code, we use the CoordinateConverter class provided by Amap to perform coordinate conversion. You can set the value to be converted through the coord() method. Coordinates, specify the coordinate type to be converted in the from() method, and the convert() method can complete the conversion.

3. Usage example

Let’s use the tool class just written to perform coordinate conversion. Suppose we have a WGS84 coordinate (39.9087, 116.3975) and need to convert it to Gaode coordinates.

public class Main {
    public static void main(String[] args) {
        LatLng originalLatLng = new LatLng(39.9087, 116.3975);
        LatLng amapLatLng = CoordinateConvertUtils.wgs84ToAmap(originalLatLng);
        System.out.println("原始坐标: (" + originalLatLng.latitude + ", " + originalLatLng.longitude + ")");
        System.out.println("转换后的坐标: (" + amapLatLng.latitude + ", " + amapLatLng.longitude + ")");
    }
}

Run the above code, you can get the following output:

原始坐标: (39.9087, 116.3975)
转换后的坐标: (39.913831, 116.403798)

4. Summary

This article introduces the use of Java to develop a longitude and latitude conversion tool for the Amap API. By introducing the Amap Java SDK and writing the CoordinateConvertUtils tool class, the conversion of longitude and latitude can be easily achieved. In practical applications, developers can use geocoding, reverse geocoding and other interfaces as needed to implement more complex functions. I hope this article will be helpful to everyone when using the Amap API to convert latitude and longitude.

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