java实现百度坐标的摩卡托坐标与火星坐标转换的示例

这是百度地图的摩卡托坐标与火星坐标的相互转换方法，大家参考使用吧

/**
 * 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;
 }
}