public classPositionUtil {public static double pi = 3.1415926535897932384626;public static double x_pi = 3.14159265358979324 * 3000.0 / 180.0;public static double a = 6378245.0;public static double ee = 0.00669342162296594323;public static double transformLat(double x, doubley) {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;returnret;

}public static double transformLon(double x, doubley) {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;returnret;

}public static double[] transform(double lat, doublelon) {if(outOfChina(lat, lon)) {return new double[]{lat,lon};

}double dLat = transformLat(lon - 105.0, lat - 35.0);double dLon = transformLon(lon - 105.0, lat - 35.0);double radLat = lat / 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);double mgLat = lat +dLat;double mgLon = lon +dLon;return new double[]{mgLat,mgLon};

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

}/*** 84 to 火星坐标系 (GCJ-02) World Geodetic System ==> Mars Geodetic System

*

*@paramlat

*@paramlon

*@return

*/

public static double[] gps84_To_Gcj02(double lat, doublelon) {if(outOfChina(lat, lon)) {return new double[]{lat,lon};

}double dLat = transformLat(lon - 105.0, lat - 35.0);double dLon = transformLon(lon - 105.0, lat - 35.0);double radLat = lat / 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);double mgLat = lat +dLat;double mgLon = lon +dLon;return new double[]{mgLat, mgLon};

}/*** * 火星坐标系 (GCJ-02) to 84 * *@paramlon *@paramlat *@return**/

public static double[] gcj02_To_Gps84(double lat, doublelon) {double[] gps =transform(lat, lon);double lontitude = lon * 2 - gps[1];double latitude = lat * 2 - gps[0];return new double[]{latitude, lontitude};

}/*** 火星坐标系 (GCJ-02) 与百度坐标系 (BD-09) 的转换算法 将 GCJ-02 坐标转换成 BD-09 坐标

*

*@paramlat

*@paramlon*/

public static double[] gcj02_To_Bd09(double lat, doublelon) {double x = lon, y =lat;double z = Math.sqrt(x * x + y * y) + 0.00002 * Math.sin(y *x_pi);double theta = Math.atan2(y, x) + 0.000003 * Math.cos(x *x_pi);double tempLon = z * Math.cos(theta) + 0.0065;double tempLat = z * Math.sin(theta) + 0.006;double[] gps ={tempLat,tempLon};returngps;

}/*** * 火星坐标系 (GCJ-02) 与百度坐标系 (BD-09) 的转换算法 * * 将 BD-09 坐标转换成GCJ-02 坐标 * *@param* bd_lat *@parambd_lon *@return

*/

public static double[] bd09_To_Gcj02(double lat, doublelon) {double x = lon - 0.0065, y = lat - 0.006;double z = Math.sqrt(x * x + y * y) - 0.00002 * Math.sin(y *x_pi);double theta = Math.atan2(y, x) - 0.000003 * Math.cos(x *x_pi);double tempLon = z *Math.cos(theta);double tempLat = z *Math.sin(theta);double[] gps ={tempLat,tempLon};returngps;

}/**将gps84转为bd09

*@paramlat

*@paramlon

*@return

*/

public static double[] gps84_To_bd09(double lat,doublelon){double[] gcj02 =gps84_To_Gcj02(lat,lon);double[] bd09 = gcj02_To_Bd09(gcj02[0],gcj02[1]);returnbd09;

}public static double[] bd09_To_gps84(double lat,doublelon){double[] gcj02 =bd09_To_Gcj02(lat, lon);double[] gps84 = gcj02_To_Gps84(gcj02[0], gcj02[1]);//保留小数点后六位

gps84[0] = retain6(gps84[0]);

gps84[1] = retain6(gps84[1]);returngps84;

}/**保留小数点后六位

*@paramnum

*@return

*/

private static double retain6(doublenum){

String result= String .format("%.6f", num);returnDouble.valueOf(result);

}

}