/**  * 百度摩卡拖坐标与火星坐标的加密解密算法  * @author XFan  *  */ public class Outer {  private static double lat = 31.22997;  private static double lon = 121.640756;  public static double x_pi = lat * lon / 180.0;  public static void main(String[] args) {   System.out.println("摩卡坐标经纬度:"+lat+","+lon);   System.out.println("火星坐标经纬度:"+bd_decrypt(lat,lon));  }  //解密成为火星坐标  public static String bd_decrypt(double bd_lat, double bd_lon)  {      double x = bd_lon - 0.0065, y = bd_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 gg_lon = z * Math.cos(theta);      double gg_lat = z * Math.sin(theta);      return gg_lat+","+gg_lon;  }  //加密成为摩卡托坐标  public static String bd_encrypt(double gg_lat, double gg_lon)  {      double x = gg_lon, y = gg_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 bd_lon = z * Math.cos(theta) + 0.0065;      double bd_lat = z * Math.sin(theta) + 0.006;      return gg_lat+","+gg_lon;  } }