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maven库导包

        <dependency>

            　　<groupId>org.gavaghan</groupId>

            　　<artifactId>geodesy</artifactId>

            　　<version>1.1.3</version>

        </dependency>

import org.gavaghan.geodesy.Ellipsoid;import org.gavaghan.geodesy.GeodeticCalculator;import org.gavaghan.geodesy.GeodeticCurve;import org.gavaghan.geodesy.GlobalCoordinates;public class test {    public static void main(String[] args)    {        // //121.717594,31.12055    121.817629,31.090867        GlobalCoordinates source = new GlobalCoordinates(31.12055, 121.717594);        GlobalCoordinates target = new GlobalCoordinates(31.090867, 121.817629);         double meter1 = getDistanceMeter(source, target, Ellipsoid.Sphere);        double meter2 = getDistanceMeter(source, target, Ellipsoid.WGS84);         System.out.println("Sphere坐标系计算结果："+meter1 + "米");        System.out.println("WGS84坐标系计算结果："+meter2 + "米");    }     public static double getDistanceMeter(GlobalCoordinates gpsFrom, GlobalCoordinates gpsTo, Ellipsoid ellipsoid)    {        //创建GeodeticCalculator，调用计算方法，传入坐标系、经纬度用于计算距离        GeodeticCurve geoCurve = new GeodeticCalculator().calculateGeodeticCurve(ellipsoid, gpsFrom, gpsTo);         return geoCurve.getEllipsoidalDistance();    }}

 对比百度地图，计算结果和Sphere坐标系计算结果一致，表明计算结果正确，WGS84坐标系的计算结果存在几十米的误差。不同的坐标系精度不同，计算结果不一样。

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