openlayer 4326与3857坐标互转之Java版

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public class Transform {       private static final double PI = Math.PI;     private static final double mercatorMax = 20037508.34;       /**      * 4326坐标转3857即经纬度转墨卡托      * @param lon      * @param lat      */     public static void transformTo3857(double lon,double lat){         double mercatorx = lon * mercatorMax / 180;         double mercatory = Math.log(Math.tan(((90+lat) * PI) / 360)) / (PI / 180);         mercatory = mercatory * mercatory / 180;         System.out.printf("经纬度坐标转墨卡托后的坐标:%f,%f",mercatorx,mercatory);     }       /**      * 墨卡托坐标转3857即墨卡托转经纬度      * @param mercatorx      * @param mercatory      */     public static void tarnsformTo4326(double mercatorx,double mercatory){         double lon = mercatorx/mercatorMax * 180;         double lat = mercatory/mercatorMax * 180;         lat = (180 / PI) * (2 *Math.atan(Math.exp((lat * PI) / 180)) - PI / 2);         System.out.printf("墨卡托坐标转经纬度后的坐标:%f,%f \n",lon,lat);     }       public static void main(String[] args) {         tarnsformTo4326(13135699.913606284,3763310.6271446524);         transformTo3857(118.000000,32.000000);     }   }