Java代码实现WGS84坐标转国测局坐标

public class GPSToGCJ {

    private static double pi = 3.14159265358979324;
    private static double a = 6378245.0;
    private static double ee = 0.00669342162296594323;


    private static boolean outOfChina(double lat, double lon) {
        if (lon < 72.004 || lon > 137.8347) {
            return true;
        }
        if (lat < 0.8293 || lat > 55.8271) {
            return true;
        }
        return false;
    }


    private static double transformLat(double x, double y) {
        double ret = -100.0 + 2.0 * x + 3.0 * y + 0.2 * y * y + 0.1 * x * y + 0.2 * Math.sqrt(Math.abs(x));
        ret += (20.0 * Math.sin(6.0 * x * pi) + 20.0 * Math.sin(2.0 * x * pi)) * 2.0 / 3.0;
        ret += (20.0 * Math.sin(y * pi) + 40.0 * Math.sin(y / 3.0 * pi)) * 2.0 / 3.0;
        ret += (160.0 * Math.sin(y / 12.0 * pi) + 320 * Math.sin(y * pi / 30.0)) * 2.0 / 3.0;
        return ret;
    }


    private static double transformLon(double x, double y) {
        double ret = 300.0 + x + 2.0 * y + 0.1 * x * x + 0.1 * x * y + 0.1 * Math.sqrt(Math.abs(x));
        ret += (20.0 * Math.sin(6.0 * x * pi) + 20.0 * Math.sin(2.0 * x * pi)) * 2.0 / 3.0;
        ret += (20.0 * Math.sin(x * pi) + 40.0 * Math.sin(x / 3.0 * pi)) * 2.0 / 3.0;
        ret += (150.0 * Math.sin(x / 12.0 * pi) + 300.0 * Math.sin(x / 30.0 * pi)) * 2.0 / 3.0;
        return ret;
    }

    /**
     * 地球坐标转换为火星坐标 World Geodetic System ==> Mars Geodetic System
     *
     * @param wgLat 地球坐标
     * @param wgLon mglat,mglon 火星坐标
     */
    public static Double[] transform2Mars(double wgLat, double wgLon) {
        Double[] gps = new Double[2];
        double mgLat, mgLon;
        if (outOfChina(wgLat, wgLon)) {
            mgLat = wgLat;
            mgLon = wgLon;
            gps[0] = mgLat;
            gps[1] = mgLon;
            return gps;
        }
        double dLat = transformLat(wgLon - 105.0, wgLat - 35.0);
        double dLon = transformLon(wgLon - 105.0, wgLat - 35.0);
        double radLat = wgLat / 180.0 * pi;
        double magic = Math.sin(radLat);
        magic = 1 - ee * magic * magic;
        double sqrtMagic = Math.sqrt(magic);
        dLat = (dLat * 180.0) / ((a * (1 - ee)) / (magic * sqrtMagic) * pi);
        dLon = (dLon * 180.0) / (a / sqrtMagic * Math.cos(radLat) * pi);
        mgLat = wgLat + dLat;
        mgLon = wgLon + dLon;
        gps[0] = mgLat;
        gps[1] = mgLon;
        return gps;
    }
}